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ONT - SEA

Find cheap flights from Ontario to Seattle from $35

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Ontario to Seattle departing on 5/21. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
0 bags
Fri 5/24
Fri 5/31

Search hundreds of travel sites at once for deals on flights to Seattle

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Ontario to Seattle.
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Ontario to Seattle.
In the last 7 days travelers have searched 44,632,927 times on KAYAK, and here is why:

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Filter your dealsChoose cabin class, free Wi-Fi and more.

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Cheap flight deals from Ontario to Seattle (ONT-SEA)

Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Ontario to Seattle that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices and deals for you by selecting your travel dates.
Choose your dates
10:49 pm - 4:31 pmONT-SEA
17h 42m1 stop
1:57 pm - 4:41 pmSEA-ONT
2h 44mnonstop
$65Frontier
Find Deal
Wed, May 8 - Wed, May 22
10:04 am - 12:57 pmONT-SEA
2h 53mnonstop
2:17 pm - 5:01 pmSEA-ONT
2h 44mnonstop
$71Frontier
Find Deal
Wed, May 29 - Fri, May 31
10:04 am - 12:57 pmONT-SEA
2h 53mnonstop
1:57 pm - 4:41 pmSEA-ONT
2h 44mnonstop
$73Frontier
Find Deal
Wed, May 22 - Sat, May 25
8:48 pm - 8:55 amONT-SEA
12h 07m1 stop
1:57 pm - 4:41 pmSEA-ONT
2h 44mnonstop
$77Frontier
Find Deal
Tue, May 7 - Tue, May 21
10:04 am - 12:57 pmONT-SEA
2h 53mnonstop
1:57 pm - 4:41 pmSEA-ONT
2h 44mnonstop
$78Frontier
Find Deal
Wed, May 29 - Tue, Jun 4
10:24 am - 1:17 pmONT-SEA
2h 53mnonstop
1:57 pm - 4:41 pmSEA-ONT
2h 44mnonstop
$79Frontier
Find Deal
Fri, May 17 - Sat, May 18
11:56 am - 2:49 pmONT-SEA
2h 53mnonstop
9:26 pm - 11:58 pmSEA-ONT
2h 32mnonstop
Thu, Jun 6 - Mon, Jun 10
6:00 am - 8:45 amONT-SEA
2h 45mnonstop
9:26 pm - 11:58 pmSEA-ONT
2h 32mnonstop
$177Alaska Airlines
Find Deal
Tue, May 14 - Tue, May 21
6:00 am - 8:45 amONT-SEA
2h 45mnonstop
6:32 am - 9:05 amSEA-ONT
2h 33mnonstop
$197Alaska Airlines
Find Deal
Tue, May 14 - Thu, May 16
5:00 pm - 7:38 pmONT-SEA
2h 38mnonstop
6:32 am - 9:05 amSEA-ONT
2h 33mnonstop
$217Alaska Airlines
Find Deal
Mon, May 13 - Sun, May 19

Flights from Ontario to Seattle - Travel Insights & Trends

Get data-powered insights and trends into flights from Ontario to Seattle to help you find the cheapest flights, the best time to fly and much more.

What’s the cheapest day of the week to fly from Ontario to Seattle?

The average price of all flights from Ontario to Seattle clicked on KAYAK for each day over the last 12 months.
If your flying dates are flexible, you should consider flying to Seattle on a Wednesday, as we generally find the cheapest rates on that day for this route. On the other hand, Sunday is the most expensive day to fly from Ontario to Seattle. For your return ticket, we recommend flying on a Wednesday and avoiding Sundays for the best deals.

What is the cheapest month to fly from Ontario to Seattle?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for flights from Ontario to Seattle, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.
The cheapest month for flights from Ontario to Seattle is October, where tickets cost $161 on average. On the other hand, the most expensive months are December and November, where the average cost of tickets is $277 and $268 respectively.

How far in advance should I book a flight from Ontario to Seattle?

To calculate daily average prices, KAYAK takes all prices for each day before departure over the last year for flights from Ontario to Seattle, removes the top 0.1% to account for outliers, and then takes the average of all the values for each month.
To get a below average price on the flight from Ontario to Seattle, you should book around 3 weeks before departure. For the absolute cheapest price, our data suggests you should book 86 days before departure.

Which airlines provide the cheapest flights from Ontario to Seattle?

The cheapest price for the route for each airline clicked by KAYAK users in the last 72 hours.
The best deals for a one-way ticket found by KAYAK users over the last 3 days were on Frontier ($35) and United Airlines ($131). The cheapest round-trip tickets were found on Frontier ($65) and Alaska Airlines ($177).

Which airlines fly non-stop between Ontario and Seattle?

Airline and price data is aggregated from results in KAYAK’s search results from the last 2 weeks for flights from Ontario to Seattle.
There are 3 airlines that fly nonstop from Ontario to Seattle. They are: Alaska Airlines, Delta and Frontier. The cheapest price of all airlines flying this route was found with Frontier at $66 for a one-way flight. On average, the best prices for this route can be found at Frontier.

How many flights are there between Ontario and Seattle per day?

Each day, there are between 11 and 14 nonstop flights that take off from Ontario and land in Seattle, with an average flight time of 2h 51m. The most common departure time is 10:00 am and most flights take off in the morning. Each week, there are 91 flights. The most frequent day of departure is Sunday, when 15% of all weekly flights depart. The fewest flights depart on a Wednesday.

Which cabin class options are there for flights between Ontario and Seattle?

The average price of flights for each cabin class for the route found by users searching on KAYAK over the last 2 weeks.
There are 4 cabin class options for the route. These are First, Business, Economy and Prem Economy. Perform a search on KAYAK to find the latest prices and availability for all cabin fares, which differ across airlines.

How long does a flight from Ontario to Seattle take?

Direct flights cover the 956 miles separating Ontario to Seattle in about 2h 35m.

What’s the earliest departure time from Ontario to Seattle?

Early birds can take the earliest flight from Ontario at 6:00 am and will be landing in Seattle at 8:45 am.

What’s the latest departure time from Ontario to Seattle?

If you prefer to fly at night, the latest flight from Ontario to Seattle jets off at 8:09 pm and lands at 10:50 pm.

Good to know

Low season

February

High season

June

Cheapest flight

$35
Best time to beat the crowds with an average 17% drop in price.
Most popular time to fly with an average 20% increase in price.
Flight from Ontario to Seattle

When to book flights from Ontario to Seattle

Are your dates flexible? Find out the best times to travel from Ontario to Seattle based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from Ontario to Seattle

  • Is onsite parking available at Ontario International Airport?

    If you plan to leave your car at the airport, Ontario International Airport has a variety of parking options ranging from Valet Parking to premium parking, long-term parking, and even economy parking. Parking Lots 3 and 4 offer the best long-term parking options as cars are charged by the day instead of hourly, as is the case for other parking lots. Parking Lot 3 is the most convenient as it is located close to Terminal 4 and Terminal 2. Parking Lot 5, on the other hand, is the furthest from the airport terminals but also the cheapest one. Anyone parking here can use the free airport shuttle to get to the terminals.

  • Which is the cheapest way to get to Ontario International Airport?

    The bus is the most budget-friendly way to get from the city center to Ontario International Airport. They can be found at Holt @ Palm Eb Fs, where you’ll take the 61 bus. This bus goes directly to the airport, and you’ll be dropped off at Terminal Way 2 in less than 20min.

  • Does Seattle Tacoma International Airport have accessibility services?

    Seattle Tacoma Airport is equipped with special access facilities to provide travelers with a safe and easy way to get around the airport. For instance, points of access to all terminals, as well as other buildings within the airport, are fitted with ramps and escalators to make it easy for anyone in a wheelchair to get through. Similarly, all the toilets have an accessible stall for travelers with limited mobility.

  • What are the layover options when flying from Ontario to Seattle?

    If you’ve booked connecting flights, your layover will depend on the airline you’re flying with. Most airlines will stop at an airport that serves as their hub since it is cheaper and extremely convenient. For example, if you’re flying with Delta, you’re most likely to have a layover at Salt Lake City International Airport, the only hub for Delta Airlines on this route. Similarly, flights serviced by United Airlines are scheduled for a layover at San Francisco International Airport, which is a hub for the airline.

  • What is the cheapest flight from Ontario to Seattle?

    In the last 3 days, the lowest price for a flight from Ontario to Seattle was $35 for a one-way ticket and $65 for a round-trip.

  • Do I need a passport to fly between Ontario and Seattle?

    A passport is not required to fly from Ontario to Seattle.

  • Which airlines offer Wi-Fi service onboard planes from Ontario to Seattle?

    Alaska Airlines, Delta, British Airways, Iberia, and Finnair offer inflight Wi-Fi service on the Ontario to Seattle flight route.

  • Which aircraft models fly most regularly from Ontario to Seattle?

    The Boeing 737-800 Passenger/BBJ2 (winglets) is the aircraft model that flies most regularly on the Ontario to Seattle flight route.

  • Which airline alliances offer flights from Ontario to Seattle?

    oneworld, and SkyTeam are the airline alliances operating flights between Ontario and Seattle, with SkyTeam being the most commonly used for this route.

  • On which days can I fly direct from Ontario to Seattle?

    There are nonstop flights from Ontario to Seattle on a daily basis.

  • Which is the best airline for flights from Ontario to Seattle, Alaska Airlines or Delta?

    The two airlines most popular with KAYAK users for flights from Ontario to Seattle are Alaska Airlines and Delta. With an average price for the route of $220 and an overall rating of 8.1, Alaska Airlines is the most popular choice. Delta is also a great choice for the route, with an average price of $216 and an overall rating of 8.0.

  • How does KAYAK find such low prices on flights from Ontario to Seattle?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Ontario to Seattle.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Ontario to Seattle?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Seattle from Ontario is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Ontario to Seattle?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Seattle with an airline and back to Ontario with another airline. Booking your flights between Ontario and SEA can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Ontario to Seattle?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Seattle from Ontario up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

See more FAQs

Top tips for finding a cheap flight from ONT to Seattle

  • Looking for a cheap flight? 25% of our users found flights on this route for $118 or less one-way and $162 or less round-trip.
  • Los Angeles International Airport (LAX) is about 50 miles away from Ontario International Airport (ONT). It provides an alternative to Ontario International Airport with better amenities and more flight options.
  • Holiday Inn Ontario International Airport is the closest hotel to the airport. If you have an early morning flight, consider spending the night here to avoid the hectic commute to the airport.
  • If you want to watch Netflix or get some work done during your flight, consider booking with Delta Airlines. They offer in-flight Wi-Fi, and the seats have power and USB outlets in case you want to recharge your devices.
  • Ontario International Airport has a good number of pet relief areas in case you’re traveling with a pet or service animal. You can find them in Terminals 2 and 4, near Gates 210 and 410, respectively.
  • Seattle-Tacoma International Airport (SEA) has shower facilities in case you want to freshen up after your flight. They can be found in the Delta Airlines Sky Club located at Concourse A, near Gate 1.
See more tips

Prefer to fly non-stop from Ontario to Seattle?

Find which airlines fly direct from Ontario to Seattle/Tacoma Intl, which days they fly and book direct flights.

Nonstop departures

Ontario to Seattle/Tacoma Intl

Monday

Alaska Airlines, Delta, Frontier, +6 more

Alaska Airlines, Delta, +7 more

Tuesday

Alaska Airlines, Delta, Frontier, +6 more

Alaska Airlines, Delta, +7 more

Wednesday

Alaska Airlines, Delta, Frontier, +6 more

Alaska Airlines, Delta, +7 more

Thursday

Alaska Airlines, Delta, Frontier, +6 more

Alaska Airlines, Delta, +7 more

Friday

Alaska Airlines, Delta, Frontier, +6 more

Alaska Airlines, Delta, +7 more

Saturday

Alaska Airlines, Delta, Frontier, +6 more

Alaska Airlines, Delta, +7 more

Sunday

Alaska Airlines, Delta, Frontier, +6 more

Alaska Airlines, Delta, +7 more

See more direct flights

Nonstop returns

Seattle/Tacoma Intl to Ontario

Monday

Alaska Airlines, Delta, Frontier, +6 more

Alaska Airlines, Delta, +7 more

Tuesday

Alaska Airlines, Delta, Frontier, +6 more

Alaska Airlines, Delta, +7 more

Wednesday

Alaska Airlines, Delta, Frontier, +6 more

Alaska Airlines, Delta, +7 more

Thursday

Alaska Airlines, Delta, Frontier, +6 more

Alaska Airlines, Delta, +7 more

Friday

Alaska Airlines, Delta, Frontier, +6 more

Alaska Airlines, Delta, +7 more

Saturday

Alaska Airlines, Delta, Frontier, +6 more

Alaska Airlines, Delta, +7 more

Sunday

Alaska Airlines, Delta, Frontier, +6 more

Alaska Airlines, Delta, +7 more

See more direct flights
See more direct flights

Top 5 airlines serving from Ontario to Seattle

 
See real verified KAYAK customer reviews for airlines flying from Ontario to Seattle. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Ontario to Seattle? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
8.1
Alaska AirlinesOverall score based on 9111 reviews
8.2boarding
8.6crew
7.3food
7.9comfort
7.3entertainment
Airline reviews

This flight was significantly affected by poor wifi connections. I couldn’t get my work done because the wifi kept dropping. Even texts were not going through. There is no seat power in premium class either. I fly a lot. Today was my 10th flight in 4 weeks. This was by far the only flight that was sub par.

4.0 OkayJanine, Apr 2024SAN - SEA
Read more about Alaska Airlines reviews

This flight was significantly affected by poor wifi connections. I couldn’t get my work done because the wifi kept dropping. Even texts were not going through. There is no seat power in premium class either. I fly a lot. Today was my 10th flight in 4 weeks. This was by far the only flight that was sub par.

Good! Although I wish I didn’t have to check my bag at the gate, when I got on the plane there was plenty of room for the bag.

The cabin stewart took care of my garment bag and then made sure I did not forget it on my way out. The stewardess gave me water after I missed the earlier service (I was asleep). I received good service overall.

Everything was fine within the parameters of flying full aircraft. My only small regret was that the non-meal, "snack" type food options had 90% medium to high sodium items. They looked appetizing, but many, if not most older Americans are restricted in sodium intake, so maybe one low/no sodium option would entice people to buy them. I brought my own food. The staff, on-time and aircraft quality were great, as usual for Alaska.

Shorten up the country? All joking aside, it was fine. Thank you very much.

Horrible, missed my connecting flight because Alaska did not give me enough time

Flights were delayed for hours. Once boarded, we were left sitting on the tarmac for too long. I had to reschedule some flights despite scheduling over a 2 hr layover between flights. I ended up running thru the airport both times. I missed getting a meal at the airport and airline required pre-orders for meals so I was starved and exhausted when I finally arrived at my destination 6 hrs later than planned. I hope I don’t have to fly again soon. This was tortuous.

Seats are crowded & tight. Flight attendants were nice enough. Flights were on time.

Airline staff were fantastic. Stop overworking and under paying them

The flight duration is 1.5 hours. Besides the point of 2h late…

It was a Red-Eye flight so was not comfortable enough to sleep, but seat was as expected. Crew was great and in-flight entertainment was excellent. Flight was smooth

Standard economy seats on Deltas 767 were better than Alaska premium seats on their 737 MAX9; more legroom, wider seats. Entertainment was great, no ipad or phone required. Could have included a meal service.

Plane was turned around due to fog half way into the flight, Delta did not properly direct passengers to stay on same flight and instead failed to properly rebook on Alaska

The boarding process was terrible especially with an indirect flight Chicago to Seattle to San Diego was terrible talking about we overbooked a flight idk if I’d take this airline ever again we got off our flight from Chicago to Seattle and we traveled for business and they told us our connecting flight was over booked and their was no seats asking people to take a delayed next flight and they don’t tell anyone coughing to wear masks seats 30A-B were terrible during the flight no one wants to sit next to people coughing all around I don’t want to be sick traveling for work or get sick anytime it’s very upsetting the staff doesn’t take this stuff serious to tell them to wear masks when they see people coughing and sneezing

Flight was on time, the crew was personable & professional, & the plane arrived early which was nice.

This flight landed early, but deplaned late. We were stuck sitting and waiting for a gate for over an hour

My flight was very clean and the location was comfortable. The service was great. A satisfying flight!

I appreciated being upgraded. I was very disappointed with my 13 hr layover in Seattle to geg, while my friends who flew Alaska made it home as scheduled. I had to reserve a hotel on my dime.

Delta needs to step up the meals and snacks. They have been serving the same two meals for three years.... It is time to change it up.

Really liked the choice of the 4 free snack options. Crew great. Good vibe on plane.

I really liked the way snacks and drinks were available throughout the flight!!! The flight attendants were also all fantastic!

Best Thing flight took less time than programmed, quick entry and exit. Recommended!

Always like Jet Blue! It seems, however, that people are getting bigger & seats are getting smaller! We had a very full flight and I couldn't get an aisle seat like I always do. I wish there were more leg room. People sitting next to me were very nice though so it was fine to disturb them if I needed to use the restroom. Otherwise the flight was fine but a bit long.

For some reason, the seats on this flight seemed unusually uncomfortable. Speaking with friends who took another JetBlue flight later in the day, they brought up the same issue.

None of the in flight Direct TV worked. A better selection of Shows would have been better. The baggage was s low. Otherwise we enjoyed our flight!

The service was very good, will use the airline again.

the staff was very helpful and the airline was very good.

JetBlue has really gone downhill. They have all the problems without the discounted price. If you need to get anywhere in time, this is no longer the airlines for you

Seat was surprisingly comfortable and roomy. I like the onboard “pantry”. Lavatory was kept very clean.

Flight was delayed 30 minutes, but otherwise was terrific. We used our points to upgrade to Mint for the first time which was a fun & comfortable. Josh & Kori were very attentive & genuinely cared about our comfort.

Kayak does not know that spirit airlines charged me $70 to fly. But the bag check-in was $89 each way. This is false advertising to lure people. Spirit airlines sends bunch of emails after flight purchases to buy wifi, better seats, priority boarding, secure reserved seats. This is false advertising. Up front pricing. I would of flown jet blue or Alaska airlines.

One hour late taking off. Concerning, very hard landing. Uncomfortable seats with no recline. Extremely slow baggage claim. Very professional, knowledgeable flight attendants. Brand new, very clean plane.

Can’t say there was anything I particularly liked. Seats were very tight, leather wrapped plastic. I followed up a much longer and cheaper trip from Honolulu on southwest, everything was phenomenal, this flight was the exact opposite. Blows my mind they charge for water of all things. One of the attendants seemed very rude, I watched a taller gentleman a couple rows forward with his knees pressed into the back of the seat ahead, while the woman in that seat leaned forward the entire flight, I’m sure because she could feel his knees. I’ll be avoiding spirit like the plague from here forward.

Didn’t make the connecting flight due to a delay on our first flight.

I felt scam to have to pay $50 additional for my carry on luggage which was free for my other airline.

Enjoyed the experience, on time flights, friendly staff the WiFi was intros d kept cutting out.

Awful experience. Both flights were delayed several times with weather but also crew members being the official cause. The vouchers are unusable and insufficient ($50 voucher to fly the same crappy airline is a joke for putting me on a red-eye that landed at 3:00 am). The aircrafts were old and uncomfortable (have a real pocket on the seat, for crying out loud!).

Its so random that they only allow 40 pounds on checked bags when all airlines take 55. They then charge you for each 10 extra pounds, so my checked suitcase was $130 and the flight $30 ... its like whattt, im for sure not traveling with Spirit again

It wasn’t as horrible as I would have expected, however, to not provide water and change so much for bags is a ripoff to say the least.

Don’t fly with Spirit unless you wanna be treated like trash. Racist employee too

They cancelled the flight then did nothing to help us rebook. It was awful - I won’t fly with them again

The process of buying the ticket and navigating all the hidden charges that Frontier throws at you was a terrible experience. The actual airport experience and flying was fine.

The truck that was refueling the plane drove away with the hose still connected to the plane and ripped part of the plane off with it

Terrible. Seats are bad and the baggage policy is inconsistent

Better than I expected but I did pay for a seat and carry on bags ahead of time.

I hope to avoid flying with them in the future. First flight got cancelled then got stuck with a 13 hour layover in Denver. The process was long and frustrating to many people.

Flight was delayed on the runway for 40 minutes the crew did not even offer even water to passengers to compensate for the flight delayed. The flight was delayed due to aircraft mechanical issues. Worst customer service ever

The whole experience was bad. Didn't know no complimentary drinks or snacks. $4.39 for a soda is ridiculous even a bottle water. A carry on was $74 just crazy. I don't think I will take this airline ever again. Very bad

The flight was delayed and I had to cancel because I would have missed my connection and there were no other flights for the next two days. They also lost my bag!!

They didn’t bother to restock the plane before we left, so most items on the menu were not available.

Book cheap flights from Ontario to Seattle

Recent one-way flight deals

 
Only flying one-way? Below are some of the best one-way flight deals from Ontario to Seattle found on KAYAK in the last 72 hours.
5/21Tue
nonstopFrontier
2h 53mONT-SEA
$35
5/28Tue
nonstopFrontier
2h 53mONT-SEA
$39
7/17Wed
nonstopFrontier
2h 47mONT-SEA
$40
6/23Sun
1 stopUnited Airlines
4h 50mONT-SEA
$131
7/17Wed
1 stopAlaska Airlines
5h 32mONT-SEA
$138
5/8Wed
nonstopAlaska Airlines
2h 38mONT-SEA
$149
5/29Wed
1 stopUnited Airlines
4h 40mONT-SEA
$154
5/21Tue
1 stopDelta
5h 06mONT-SEA
$158
7/11Thu
1 stopDelta
5h 07mONT-SEA
$193
7/4Thu
2 stopsAmerican Airlines
15h 16mONT-SEA
$358

Search by stops

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Last minute flights from Ontario to Seattle

Last minute flight, train and bus deals

 
These last-minute flight deals are the cheapest flights found on KAYAK in the last 72 hours for flights from Ontario to Seattle that are departing in the next 10 days.
4/28Sun
multi-stopFrontier
9h 56mONT-SEA
5/22Wed
nonstopFrontier
2h 44mSEA-ONT
$119
4/29Mon
multi-stopFrontier
10h 49mONT-SEA
5/22Wed
nonstopFrontier
2h 44mSEA-ONT
$123
4/28Sun
nonstopAlaska Airlines
2h 45mONT-SEA
5/22Wed
nonstopAlaska Airlines
2h 32mSEA-ONT
$337
4/29Mon
nonstopAlaska Airlines
2h 38mONT-SEA
5/5Sun
nonstopAlaska Airlines
2h 33mSEA-ONT
$342
4/29Mon
nonstopDelta
2h 59mONT-SEA
5/5Sun
nonstopDelta
2h 40mSEA-ONT
$362
4/25Thu
multi-stopUnited Airlines
6h 07mONT-SEA
5/1Wed
multi-stopUnited Airlines
6h 34mSEA-ONT
$416
4/28Sun
nonstopDelta
2h 55mONT-SEA
4/30Tue
nonstopDelta
2h 41mSEA-ONT
$422
4/25Thu
multi-stopUnited Airlines
8h 21mONT-SEA
4/25Thu
multi-stopUnited Airlines
6h 21mSEA-ONT
$486
4/29Mon
multi-stopAmerican Airlines
7h 13mONT-SEA
5/8Wed
multi-stopAmerican Airlines
12h 37mSEA-ONT
$769
4/29Mon
multi-stopAmerican Airlines
10h 55mONT-SEA
5/9Thu
multi-stopAmerican Airlines
6h 47mSEA-ONT
$851

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Ontario - Seattle Flights

Departure:

Ontario (ONT)United States

Destination:

Seattle (SEA)United States

Return flight deals:

Seattle - Ontario

Cabin classes:

$362
$625
$446
$84