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Find deals on international flights to Ontario from $37

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 6/8. 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 6/21
Fri 6/28

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In the last 7 days travelers have searched 43,423,329 times on KAYAK, and here is why:

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Good to know

Low season

January

High season

December

Cheapest flight

$37
Best time to beat the crowds with an average 13% drop in price.
Most popular time to fly with an average 9% increase in price.
Flight from San Francisco to Ontario

FAQs for booking Worldwide to Ontario flights

  • How does KAYAK find such low prices on flights from Worldwide 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 Worldwide to Ontario.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Ontario from Worldwide 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 Worldwide 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 Worldwide with another airline.

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

Nonstop departures

Worldwide 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 Worldwide

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 Worldwide to Ontario

Recent round-trip flight deals

6/19Wed
nonstopFrontier
1h 23mSFO-ONT
6/26Wed
nonstopFrontier
1h 28mONT-SFO
$48
6/4Tue
nonstopFrontier
1h 24mSFO-ONT
6/11Tue
nonstopFrontier
1h 28mONT-SFO
$57
8/6Tue
nonstopAlaska Airlines
2h 35mSEA-ONT
8/13Tue
nonstopAlaska Airlines
2h 35mONT-SEA
$157
6/26Wed
1 stopAmerican Airlines
6h 27mSFO-ONT
6/30Sun
1 stopAmerican Airlines
6h 29mONT-SFO
$158
8/13Tue
1 stop
6h 11mSEA-ONT
8/17Sat
nonstop
2h 47mONT-SEA
$162
6/20Thu
nonstop
2h 44mSEA-ONT
6/27Thu
nonstop
2h 35mONT-SEA
$173
8/21Wed
nonstopDelta
2h 36mSEA-ONT
8/29Thu
nonstopDelta
2h 44mONT-SEA
$177
7/2Tue
1 stopDelta
6h 05mDEN-ONT
7/6Sat
1 stopDelta
4h 20mONT-DEN
$196
8/20Tue
1 stopAlaska Airlines
5h 45mSEA-ONT
8/27Tue
1 stopAlaska Airlines
4h 37mONT-SEA
$216
8/7Wed
1 stopAmerican Airlines
5h 56mHOU-ONT
8/10Sat
1 stopAmerican Airlines
5h 47mONT-HOU
$216

Search by stops

Search by airline

Search by price

Recent one-way flight deals

6/8Sat
nonstopFrontier
1h 23mSFO-ONT
$37
7/3Wed
nonstopFrontier
1h 23mSFO-ONT
$38
5/27Mon
1 stopAmerican Airlines
5h 52mSFO-ONT
$74
5/26Sun
1 stopAmerican Airlines
5h 49mSFO-ONT
$79
6/25Tue
nonstopAlaska Airlines
2h 35mSEA-ONT
$79
7/2Tue
1 stopUnited Airlines
7h 10mSEA-ONT
$98
7/27Sat
1 stopDelta
6h 25mDEN-ONT
$98
6/24Mon
nonstopAlaska Airlines
2h 33mSEA-ONT
$99
8/1Thu
1 stopDelta
6h 45mSEA-ONT
$108
7/10Wed
1 stopUnited Airlines
5h 15mDEN-ONT
$128

Search by stops

Search by airline

Search by price

Last minute flights from Worldwide to Ontario

Last minute flight, train and bus deals

5/27Mon
nonstopFrontier
1h 24mSFO-ONT
6/26Wed
nonstopFrontier
1h 28mONT-SFO
$95
5/26Sun
nonstopFrontier
1h 24mSFO-ONT
5/29Wed
nonstopFrontier
1h 28mONT-SFO
$98
5/25Sat
multi-stopAmerican Airlines
5h 52mSFO-ONT
5/27Mon
multi-stopAmerican Airlines
5h 24mONT-SFO
$148
5/23Thu
multi-stopAmerican Airlines
5h 37mSFO-ONT
5/27Mon
multi-stopAmerican Airlines
5h 24mONT-SFO
$158
5/25Sat
nonstop
2h 22mDEN-ONT
6/1Sat
multi-stop
8h 07mONT-DEN
$242
5/25Sat
nonstop
2h 22mDEN-ONT
5/31Fri
multi-stop
8h 07mONT-DEN
$302
5/25Sat
multi-stopDelta
6h 24mORD-ONT
5/26Sun
multi-stopDelta
8h 47mONT-ORD
$322
5/23Thu
nonstopUnited Airlines
1h 35mSFO-ONT
5/28Tue
nonstopUnited Airlines
1h 25mONT-SFO
$324
5/25Sat
nonstopUnited Airlines
1h 32mSFO-ONT
5/28Tue
nonstopUnited Airlines
1h 25mONT-SFO
$349
5/26Sun
multi-stopDelta
15h 36mLGA-ONT
5/30Thu
multi-stopDelta
13h 54mONT-LGA
$352

Search by stops

Search by airline

Search by price

Flights to Ontario

Destination:

Ontario (ONT)United States

Return flight deals:

Ontario - Worldwide

Cabin classes:

$341
$478
$193
$34