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$44 Find cheap flights from California to Ontario

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight to Ontario departing on 9/16. 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
Tue 7/2
Tue 7/9

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In the last 7 days travelers have searched 42,335,261 times on KAYAK, and here is why:

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Good to know

Low season

January

High season

May

Cheapest flight

$44
Best time to beat the crowds with an average 11% drop in price.
Most popular time to fly and prices are also 8% lower on average.
Flight from San Francisco to Ontario

FAQs for booking flights from California to Ontario

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

    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 California to Ontario.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Ontario from California 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 California to Ontario?

    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 Ontario with an airline and back to California with another airline.

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

    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 Ontario from California up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

See more FAQs

Prefer to fly non-stop from California to Ontario?

Find which airlines fly direct from California to Ontario, which days they fly and book direct flights.

Nonstop departures

California to Ontario

Monday

Aeromexico, Air Canada, Air France, +23 more

Aeromexico, Air Canada, +24 more

Tuesday

Aeromexico, Air Canada, Air France, +24 more

Aeromexico, Air Canada, +25 more

Wednesday

Aeromexico, Air Canada, Air France, +23 more

Aeromexico, Air Canada, +24 more

Thursday

Aeromexico, Air Canada, Air France, +24 more

Aeromexico, Air Canada, +25 more

Friday

Aeromexico, Air Canada, Air France, +22 more

Aeromexico, Air Canada, +23 more

Saturday

Aeromexico, Air Canada, Air France, +23 more

Aeromexico, Air Canada, +24 more

Sunday

Aeromexico, Air Canada, Air France, +24 more

Aeromexico, Air Canada, +25 more

See more direct flights

Nonstop returns

Ontario to California

Monday

Aeromexico, Air Canada, Air France, +23 more

Aeromexico, Air Canada, +24 more

Tuesday

Aeromexico, Air Canada, Air France, +24 more

Aeromexico, Air Canada, +25 more

Wednesday

Aeromexico, Air Canada, Air France, +23 more

Aeromexico, Air Canada, +24 more

Thursday

Aeromexico, Air Canada, Air France, +24 more

Aeromexico, Air Canada, +25 more

Friday

Aeromexico, Air Canada, Air France, +22 more

Aeromexico, Air Canada, +23 more

Saturday

Aeromexico, Air Canada, Air France, +23 more

Aeromexico, Air Canada, +24 more

Sunday

Aeromexico, Air Canada, Air France, +24 more

Aeromexico, Air Canada, +25 more

See more direct flights
See more direct flights

Book cheap flights from California to Ontario

Recent round-trip flight deals

6/13Thu
nonstopFrontier
1h 23mSFO-ONT
6/17Mon
nonstopFrontier
1h 27mONT-SFO
$66
6/16Sun
nonstopFrontier
1h 03mLAS-ONT
6/17Mon
nonstopFrontier
1h 10mONT-LAS
$66
8/14Wed
1 stopAmerican Airlines
5h 33mSMF-ONT
8/28Wed
1 stopAmerican Airlines
5h 55mONT-SMF
$176
10/3Thu
1 stopAmerican Airlines
5h 52mLAS-ONT
10/8Tue
1 stopAmerican Airlines
3h 34mONT-LAS
$196
8/27Tue
1 stopAlaska Airlines
7h 18mMFR-ONT
8/28Wed
1 stopAlaska Airlines
7h 31mONT-MFR
$206
7/6Sat
nonstopUnited Airlines
1h 30mSFO-ONT
7/10Wed
nonstopUnited Airlines
1h 20mONT-SFO
$213
10/21Mon
1 stopUnited Airlines
4h 55mSMF-ONT
10/26Sat
1 stopUnited Airlines
3h 55mONT-SMF
$216
6/21Fri
1 stopDelta
6h 17mRNO-ONT
6/21Fri
1 stopDelta
6h 26mONT-RNO
$218
8/14Wed
1 stopDelta
6h 45mSMF-ONT
8/28Wed
2 stopsDelta
8h 28mONT-SMF
$220
10/9Wed
1 stopAlaska Airlines
5h 05mMFR-ONT
10/23Wed
2 stopsAlaska Airlines
15h 27mONT-MFR
$279

Search by stops

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Recent one-way flight deals

9/16Mon
nonstopFrontier
1h 21mSFO-ONT
$44
9/29Sun
nonstopFrontier
1h 06mLAS-ONT
$44
7/13Sat
1 stopDelta
6h 57mSMF-ONT
$78
7/13Sat
2 stopsDelta
8h 49mSMF-ONT
$83
8/14Wed
1 stopAmerican Airlines
5h 32mSMF-ONT
$88
8/7Wed
1 stopAmerican Airlines
5h 33mLAS-ONT
$98
6/22Sat
1 stopUnited Airlines
6h 37mSMF-ONT
$108
6/15Sat
1 stopUnited Airlines
6h 37mSMF-ONT
$118
8/16Fri
1 stopAlaska Airlines
5h 37mMFR-ONT
$123
10/19Sat
1 stopAlaska Airlines
5h 12mSFO-ONT
$141

Search by stops

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Search by price

Last minute flights from California to Ontario

Last minute flight, train and bus deals

6/4Tue
nonstopFrontier
1h 10mLAS-ONT
6/5Wed
nonstopFrontier
1h 09mONT-LAS
$92
6/5Wed
nonstopFrontier
1h 23mSFO-ONT
6/8Sat
nonstopFrontier
1h 27mONT-SFO
$93
6/4Tue
multi-stopDelta
6h 13mRNO-ONT
6/11Tue
multi-stopDelta
6h 26mONT-RNO
$298
6/3Mon
multi-stopUnited Airlines
3h 45mRNO-ONT
6/6Thu
multi-stopUnited Airlines
3h 37mONT-RNO
$318
6/7Fri
multi-stopUnited Airlines
5h 27mRNO-ONT
6/10Mon
multi-stopUnited Airlines
3h 46mONT-RNO
$343
6/5Wed
multi-stopDelta
6h 26mSMF-ONT
6/17Mon
multi-stopDelta
6h 50mONT-SMF
$421
6/6Thu
multi-stopAmerican Airlines
6h 02mSJC-ONT
6/7Fri
multi-stopAmerican Airlines
6h 07mONT-SJC
$468
6/7Fri
multi-stopAmerican Airlines
5h 08mRNO-ONT
6/9Sun
multi-stopAmerican Airlines
5h 28mONT-RNO
$468
6/4Tue
multi-stop
9h 43mSFO-ONT
6/7Fri
multi-stop
3h 52mONT-SFO
$496
6/4Tue
multi-stop
9h 43mSFO-ONT
6/5Wed
multi-stop
5h 58mONT-SFO
$516

Search by stops

Search by airline

Search by price