Find flights
Deals
Insights
When to book
FAQs & Tips
Airlines

ONT - WAS

$73 Find cheap flights from Ontario to Washington, D.C.

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 Washington, D.C. departing on 6/17. 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
Thu 7/11
Thu 7/18

Search hundreds of travel sites at once for deals on flights to Washington, D.C.

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Ontario to Washington, D.C..
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Ontario to Washington, D.C..
In the last 7 days travelers have searched 42,898,604 times on KAYAK, and here is why:

Save 21% or moreCompare multiple travel sites with one search.

Track pricesNot ready to book? Create a price alert for when prices drop.

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

Bundle and saveSave money when you bundle your flight + hotel.

Cheap flight deals from Ontario to Washington, D.C. (ONT-WAS)

Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Ontario to Washington, D.C. 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
12:49 am - 12:09 pmONT-DCA
8h 20m1 stop
6:59 pm - 11:59 pmDCA-ONT
8h 00m1 stop
$154Frontier
Find Deal
Mon, Jul 15 - Tue, Jul 30
12:59 am - 12:05 pmONT-DCA
8h 06m1 stop
6:59 pm - 11:59 pmDCA-ONT
8h 00m1 stop
$155Frontier
Find Deal
Mon, Jul 1 - Tue, Jul 16
10:30 pm - 8:44 amONT-IAD
7h 14m1 stop
6:52 am - 11:47 amIAD-ONT
7h 55m1 stop
$282American Airlines
Find Deal
Mon, Aug 19 - Wed, Aug 28
11:59 pm - 12:38 pmONT-IAD
9h 39m2 stops
5:29 pm - 10:27 pmIAD-ONT
7h 58m1 stop
$287American Airlines
Find Deal
Mon, Aug 19 - Wed, Aug 28
1:20 pm - 11:53 pmONT-IAD
7h 33m1 stop
6:00 am - 10:18 amIAD-ONT
7h 18m1 stop
$290Delta
Find Deal
Tue, Sep 17 - Thu, Sep 19
10:00 pm - 11:24 amONT-IAD
10h 24m2 stops
6:00 am - 10:13 amIAD-ONT
7h 13m1 stop
$319Delta
Find Deal
Thu, Aug 15 - Sun, Aug 18
6:35 pm - 5:35 amONT-IAD
8h 00m1 stop
7:01 am - 12:15 pmIAD-ONT
8h 14m1 stop
$321United Airlines
Find Deal
Tue, Jul 16 - Tue, Jul 23
6:25 pm - 5:25 amONT-IAD
8h 00m1 stop
4:10 pm - 8:48 pmIAD-ONT
7h 38m1 stop
$328United Airlines
Find Deal
Sat, Jun 29 - Thu, Jul 4
10:10 am - 11:59 pmONT-IAD
10h 49m1 stop
4:13 pm - 10:20 pmIAD-ONT
9h 07m1 stop
$378Alaska Airlines
Find Deal
Thu, Sep 5 - Tue, Sep 10
7:00 am - 11:59 pmONT-IAD
13h 59m2 stops
4:13 pm - 10:20 pmIAD-ONT
9h 07m1 stop
$385Alaska Airlines
Find Deal
Sat, Sep 7 - Tue, Sep 10

Flights from Ontario to Washington, D.C. - Travel Insights & Trends

Get data-powered insights and trends into flights from Ontario to Washington, D.C. 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 Washington, D.C.?

The average price of all flights from Ontario to Washington, D.C. clicked on KAYAK for each day over the last 12 months.
For Ontario to Washington, D.C., Wednesday is the cheapest day to fly on average and Sunday is the most expensive. Flying from Washington, D.C. back to Ontario, the best deals are generally found on Tuesday, with Sunday being the most expensive.

What is the cheapest month to fly from Ontario to Washington, D.C.?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for flights from Ontario to Washington, D.C., 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 Washington, D.C. is September, where tickets cost $279 on average. On the other hand, the most expensive months are June and December, where the average cost of tickets is $436 and $422 respectively.

How far in advance should I book a flight from Ontario to Washington, D.C.?

To calculate daily average prices, KAYAK takes all prices for each day before departure over the last year for flights from Ontario to Washington, D.C., 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 Washington, D.C., you should book around 2 weeks before departure. For the absolute cheapest price, our data suggests you should book 71 days before departure.

Good to know

Low season

February

High season

August

Cheapest flight

$73
Best time to beat the crowds with an average 45% drop in price.
Most popular time to fly with an average 8% increase in price.
Flight from Ontario to Baltimore

When to book flights from Ontario to Washington, D.C.

Are your dates flexible? Find out the best times to travel from Ontario to Washington, D.C. 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 Washington, D.C.

  • What is the cheapest flight from Ontario to Washington, D.C.?

    In the last 3 days, the lowest price for a flight from Ontario to Washington, D.C. was $73 for a one-way ticket and $154 for a round-trip.

  • Do I need a passport to fly between Ontario and Washington, D.C.?

    No

  • Which airports will I be using when flying from Ontario to Washington, D.C.?

    When flying out of Ontario you will be using Ontario. You will be landing at one of these airports: Washington, D.C. Reagan-National or Washington, D.C. Dulles Intl.

  • Which aircraft models fly most regularly from Ontario to Washington, D.C.?

    The Airbus A319 is the aircraft model that flies most regularly on the Ontario to Washington, D.C. flight route.

  • Which airline alliances offer flights from Ontario to Washington, D.C.?

    SkyTeam, oneworld, and Star Alliance are the airline alliances operating flights between Ontario and Washington, D.C., with oneworld being the most commonly used for this route.

  • Which is the best airline for flights from Ontario to Washington, D.C., Delta or Alaska Airlines?

    The two airlines most popular with KAYAK users for flights from Ontario to Washington, D.C. are Delta and Alaska Airlines. With an average price for the route of $394 and an overall rating of 8.0, Delta is the most popular choice. Alaska Airlines is also a great choice for the route, with an average price of $266 and an overall rating of 8.0.

  • How does KAYAK find such low prices on flights from Ontario to Washington, D.C.?

    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 Washington, D.C..

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Ontario to Washington, D.C.?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Washington, D.C. 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 Washington, D.C.?

    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 Washington, D.C. with an airline and back to Ontario with another airline.

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

    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 Washington, D.C. 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 5 airlines serving from Ontario to Washington, D.C.

 
See real verified KAYAK customer reviews for airlines flying from Ontario to Washington, D.C.. 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 Washington, D.C.? 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.
8.0
DeltaOverall score based on 10277 reviews
8.6Crew
7.4Food
8.2Boarding
8.0Entertainment
7.9Comfort
Airline reviews

There was plenty of overhead room but half of the passengers were told they had to check their carryon bags. My partner and I checked in as early as possible and our seats were split across the aisle.

4.0 OkayBrooke, Jun 2024SFO - MSP
Read more about Delta reviews

There was plenty of overhead room but half of the passengers were told they had to check their carryon bags. My partner and I checked in as early as possible and our seats were split across the aisle.

Flew first class so everything was great. But maybe because the flights were red eye, no meals were served, just chips. I flew Alaska Air 1st class at 9PM (2 hour flight) and they served beef short rib sliders!

There was a loud squeaky sound the whole time we were flying.

I didn’t not like that I could not select my seat and ended up with the worse seat.

The landing was bad and the hostess came two times and i was sleeping but when she served the person that nexts to me I woke up and she didn’t even asked me if I need any drink or snacks two times!!!!

Plane was late because of a mechanical malfunction and the food listed as available was not. Flight attendants seem over worked and under paid. They just done seem happy. And that can be seen in their faces.

Waited 3 hours on a plane to de-ice due to manpower issues. Waited another hour and a half once we landed because of a gate issue. Missed my connections. Created. A total of 13 hours of delay.

Great, on time departure, friendly and accommodating crew, great leg room, Smith flight

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

Like most domestic flights in the US, you are basically on your own with this airline when it comes to food, so be sure to purchase meals and drinks ahead of time or expect to arrive starving and dehydrated (like I was).

Flight was delayed in the gate by 5 hours and ultimately cancelled- rebooking service by United agents was terrible

All flights were on time and boarding was issue free

Water service would be great. The way they board is terrible. Slow passengers first😂😂 They need to smart up a bit

It got me where I needed it to; not much more. It had no competition so that was why I chose it.

Plane didn’t even make it off the ground. We all had to get off and walk to a different terminal (lots of confusion) to get on a different plane. Landed fairly late, connections missed.

Crowded flight, but upbeat and kind crew. Pilot greeted us at door, flight attendant thanked a number of “special” passengers for their business, another addressed an eight-year old boy as “young man.” United obviously trying to up their game, but though all of that is nice and notable, flying still feels like moving along a human assembly line, being herded into one small space after another (boarding areas with too few seats, planes with limited personal space, shuttles (IAD) packed too full.

It was ok until we got to DC and I wanted to use my United Club pass and the snobbish receptionist said that they don’t take one pass. It took me everything itch of patience not to tell her off

Food choice was poor and we had to buy on board snacks.

We were offer chocolate cookies , not everyone eat chocolate. Thank you

Lost luggage again. Our second trip to Mykonos, and 2nd time no luggage.

Terrible. I didn’t fly and I had an important meeting the next day.

The Flight attendant had an attitude and didn't allow anyone any time to prepare for landing despite being absent throughout the entire trip

The flight was great until towards the end when the flight attendant read an excessively long commercial for purchasing an american airlines credit card. The worst part is that we are doing a lot of traveling this year so i was actually interested in getting the credit card, but I was so annoyed with the long commercial that I completely dismissed the flight attendant bringing around the information. Next time, keep the sales pitch to 10 seconds and then pass around the brochures!!

Nice aircraft. Plane was PACKED full and distance between seats was tight. Had it been more than a two hour flight it would not have been tolerable. I had much more knee space on the JetBlue flight I went out on.

New ridiculous policy by american destroyed my allegiance to american. As a million miler with american, I expected it would be easy to get on an earlier flight when I got to airport earlier than expected, and save a five hour layover. WRONG. The online app would not let me switch flights, So I called, and was promised a call back in 90 minutes. HAH! The customer service desk at DCA said “we no longer have access to changing a flight on our screens. If the app couldn’t do it, I should send a letter to American, but there’s nothing else possible!”

I am tired of being nickel and dimed for seat location, checked luggage and carry on bags. That is why i rarely fly anymore.

It was right on time and crew were very courteous

Great flight. Boarding was efficient and quick. On time departure and smooth flight. Flight arrived early at destination. Good experience.

Literally the worst experience ever and I had my service dog with me. Flight was supposed to leave at 1:51 PM but the plane arrived late. They boarded us around 3 PM and kept us on the plane for an hour saying that due to weather conditions in Miami, we could not takeoff yet. After waiting for an hour, they deplaned. And then they will not give us our bags back that we could just leave and schedule for another flight. Every hour they kept updating saying we have to wait another hour without any explanation as to what was going on. Eventually, I went to customer service to change my ticket, but by the time I made it to the front of the line, they started boarding my flight again. And then when we got onto the flight, they said there were two flight attendants That were past their shift. They kept us on the plane for about another 40 minutes until they told us they had no other flight attendance and had to deplane again. Then I gave us hotel vouchers and told us we would be on a flight at 6 AM the next day. At this point it is about 9 PM. I get to the hotel with my dog, who hasn’t been able to go potty for about eight hours. When I arrived at the hotel, I got a text alert saying my flight has been canceled at 6 AM and they moved past to 5 AM, however the hotel shuttle doesn’t leave early enough to make it to the airport for 5 AM flight. So me and some other passengers got a cab after about three hours of sleep to get back to the airport. This was the worst experience ever.

Their computers were down upon arrival to the airport. They were unable to figure out how to board us. We were delayed over an hour and a half.

My flight was uncomfortable and crammed. There were no pockets to store things, I couldn’t move my seat back slightly. Beverages including soda cost extra. My husband flew on another spirit airline flight, which was delayed a total of 48 hours, only to be canceled.

Flight was canceled less than 6 hours before takeoff, rebooked on a flight that was twice as long and left earlier so we couldn’t make it, when using text support option took over 2 hours to speak with someone.

Terrible legroom, seats do not recline, tray table the size of an iPhone, delayed flight, have to pay 5$ to get a cup of water onboard.

The crew was the best and very accommodating I know you don't offer any complimentary items but water and coffee will not break the bank !!

My mother was HARASSED AND ACCOSTED by the gate agent for her bag. I pre purchased the bag fee and the gate agent made my 78 year old mother board, deplane, re pay for her bag fee and board again. The gate agent made my mother pick up her own bag and REFUSED to help her, she is an older woman who wasn’t bothering anyone on a flight that had maybe 30’total passengers. I am going to sue this airlines for their HORRIBLE customer service and treatment of my mother, and all this occurred the day after Mother’s Day!!!

Horrible, first flight delayed. They switched my connecting flight while I was en route and even though I was originally supposed to be on the flight going back home to boston, refused to let me board and told me I would have to wait for next flight that was 14 hours later. Ended up renting a car and driving 6.5 hours back home. Still getting messages about flight and it is now showing that the other flight they put me on is now canceled and I would have to wait 24 hours for the next one. I will never book with spirit again

They stuck us with multiple extra fees. I will never fly spirit again

Overall it was a miserable experience... I will never fly spirit for more than a 3 hour flight or overnight.

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.

I strongly dislike Frontier. I find them barebones, the seats not particularly comfortable, the nickel and diming is maddening, the app is TERRIBLE - super confusing to navigate, and the last 4 frontier flights I have flown have been on AVERAGE 2 hours late, one ruining a fancy night out in Vegas with reservations made well in advance, which was nodded to with a measly 5000 miles, which translates to almost nothing. At least credit a free checked bag or something.

8 hr delay. had to buy another ticket with another airline

I appreciated the upgrade to free cary-on bag and seat selection at no charge

Flight was delay 9hrs and nothing was provided at airport, had to go and get a room to sleep in, paid for Uber back and fort with no offers until we landed back home a 1hr later for a $75 voucher for a future flight.

Our flight was delayed an hour, then when we got to board our flight finally, we were waiting in our seats for take off for 45 minutes before it was communicated that there was a maintenance issue therefore we waited on the plane for over an hour while that was resolved. We did not get to Phoenix until almost 3 hours after we were originally supposed to. This was the first and last time I will be flying Frontier.

There were 3 leg for the trip and each leg was delayed by 90 minutes or more. The boarding process takes forever with people waiting on the jetway even though most folks do not have carry-on. The whole process is poorly managed.

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

Book cheap flights from Ontario to Washington, D.C.

Recent one-way flight deals

 
Only flying one-way? Below are some of the best one-way flight deals from Ontario to Washington, D.C. found on KAYAK in the last 72 hours.
6/17Mon
1 stopFrontier
19h 09mONT-BWI
$73
7/8Mon
1 stopFrontier
8h 20mONT-DCA
$77
9/25Wed
1 stopDelta
7h 33mONT-IAD
$145
9/11Wed
1 stopAlaska Airlines
10h 49mONT-IAD
$149
7/10Wed
2 stopsDelta
12h 45mONT-IAD
$150
7/23Tue
1 stopAlaska Airlines
8h 15mONT-IAD
$159
6/29Sat
1 stopUnited Airlines
8h 00mONT-IAD
$183
6/25Tue
1 stopUnited Airlines
7h 59mONT-IAD
$188
6/29Sat
1 stopAmerican Airlines
8h 37mONT-DCA
$189
11/7Thu
1 stopAmerican Airlines
6h 28mONT-IAD
$189

Search by stops

Search by airline

Search by price

Last minute flights from Ontario to Washington, D.C.

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 Washington, D.C. that are departing in the next 10 days.
6/14Fri
multi-stopFrontier
10h 42mONT-DCA
6/23Sun
multi-stopFrontier
26h 23mDCA-ONT
$222
6/14Fri
multi-stopFrontier
10h 42mONT-DCA
6/24Mon
multi-stopFrontier
7h 45mDCA-ONT
$238
6/13Thu
multi-stopDelta
8h 25mONT-DCA
6/20Thu
multi-stopDelta
8h 43mDCA-ONT
$584
6/14Fri
multi-stopDelta
8h 30mONT-IAD
6/17Mon
multi-stopDelta
7h 20mIAD-ONT
$584
6/12Wed
multi-stopUnited Airlines
8h 00mONT-IAD
6/13Thu
multi-stopUnited Airlines
15h 28mIAD-ONT
$593
6/11Tue
multi-stopAmerican Airlines
7h 49mONT-DCA
6/13Thu
multi-stopAmerican Airlines
10h 25mDCA-ONT
$624
6/12Wed
multi-stopAlaska Airlines
10h 59mONT-IAD
6/15Sat
multi-stopAlaska Airlines
11h 20mIAD-ONT
$624
6/12Wed
multi-stopAmerican Airlines
11h 35mONT-IAD
6/16Sun
multi-stopAmerican Airlines
13h 51mIAD-ONT
$634
6/14Fri
multi-stopUnited Airlines
8h 00mONT-IAD
6/17Mon
multi-stopUnited Airlines
7h 38mIAD-ONT
$684
6/12Wed
multi-stopAlaska Airlines
8h 59mONT-DCA
6/16Sun
multi-stopAlaska Airlines
10h 29mDCA-ONT
$691

Search by stops

Search by airline

Search by price

Ontario - Washington, D.C. Flights

Departure:

Ontario (ONT)United States

Return flight deals:

Washington, D.C. - Ontario

Cabin classes: