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Find deals on international flights to Ontario from $36

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 9/19. 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
Sun 7/7
Sun 7/14

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In the last 7 days travelers have searched 44,281,614 times on KAYAK, and here is why:

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Good to know

Low season

January

High season

May

Cheapest flight

$36
Best time to beat the crowds with an average 13% drop in price.
Most popular time to fly and prices are also 4% lower on average.
Flight from Seattle 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

8/20Tue
nonstopFrontier
1h 21mSFO-ONT
8/21Wed
nonstopFrontier
1h 26mONT-SFO
$40
8/20Tue
nonstopFrontier
1h 21mSFO-ONT
8/27Tue
nonstopFrontier
1h 26mONT-SFO
$41
8/13Tue
nonstop
2h 37mSEA-ONT
8/28Wed
1 stop
6h 09mONT-SEA
$141
7/3Wed
nonstop
2h 22mDEN-ONT
7/9Tue
1 stop
6h 34mONT-DEN
$143
7/10Wed
nonstopDelta
2h 54mSEA-ONT
7/17Wed
1 stopDelta
7h 01mONT-SEA
$167
7/9Tue
nonstopDelta
2h 47mSEA-ONT
7/20Sat
nonstopDelta
2h 41mONT-SEA
$177
8/27Tue
nonstopUnited Airlines
1h 30mSFO-ONT
8/30Fri
nonstopUnited Airlines
1h 27mONT-SFO
$179
7/17Wed
nonstopAlaska Airlines
2h 33mSEA-ONT
7/24Wed
1 stopAlaska Airlines
5h 32mONT-SEA
$186
6/29Sat
nonstopUnited Airlines
1h 27mSFO-ONT
7/4Thu
nonstopUnited Airlines
1h 20mONT-SFO
$197
8/1Thu
nonstopAlaska Airlines
2h 33mSEA-ONT
8/23Fri
1 stopAlaska Airlines
4h 37mONT-SEA
$206

Search by stops

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Search by price

Recent one-way flight deals

9/19Thu
nonstopFrontier
2h 37mSEA-ONT
$36
9/10Tue
nonstopFrontier
3h 02mDFW-ONT
$36
9/3Tue
nonstopAmerican Airlines
3h 19mDFW-ONT
$70
8/27Tue
1 stopDelta
6h 44mSEA-ONT
$88
7/17Wed
1 stopDelta
8h 19mDEN-ONT
$98
8/4Sun
nonstopAlaska Airlines
2h 35mSEA-ONT
$99
7/4Thu
nonstopUnited Airlines
1h 30mSFO-ONT
$99
8/28Wed
1 stopAmerican Airlines
6h 08mSFO-ONT
$100
7/5Fri
1 stopAlaska Airlines
6h 05mSEA-ONT
$102
9/4Wed
1 stopUnited Airlines
7h 47mDFW-ONT
$104

Search by stops

Search by airline

Search by price

Last minute flights from Worldwide to Ontario

Last minute flight, train and bus deals

6/11Tue
nonstopFrontier
1h 23mSFO-ONT
7/15Mon
nonstopFrontier
1h 26mONT-SFO
$78
6/11Tue
nonstopFrontier
1h 23mSFO-ONT
6/12Wed
nonstopFrontier
1h 28mONT-SFO
$80
6/11Tue
multi-stop
27h 29mDFW-ONT
6/17Mon
multi-stop
12h 58mONT-DFW
$171
6/9Sun
multi-stopSouthwest
11h 35mSFO-ONT
6/13Thu
multi-stopSouthwest
5h 15mONT-SFO
$267
6/7Fri
multi-stopDelta
7h 20mLGA-ONT
6/8Sat
multi-stopDelta
7h 23mONT-LGA
$286
6/8Sat
multi-stopAmerican Airlines
7h 30mJFK-ONT
6/9Sun
multi-stopAmerican Airlines
7h 35mONT-JFK
$286
6/8Sat
multi-stopAmerican Airlines
10h 34mJFK-ONT
6/9Sun
multi-stopAmerican Airlines
10h 01mONT-JFK
$291
6/7Fri
multi-stopDelta
7h 20mJFK-ONT
6/13Thu
multi-stopDelta
7h 46mONT-JFK
$332
6/7Fri
multi-stop
8h 06mSEA-ONT
6/9Sun
nonstop
2h 41mONT-SEA
$388
6/10Mon
multi-stopSouthwest
8h 55mLGA-ONT
6/12Wed
multi-stopSouthwest
10h 30mONT-LGA
$436

Search by stops

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Flights to Ontario

Destination:

Ontario (ONT)United States

Return flight deals:

Ontario - Worldwide

Cabin classes:

$447
$478
$193
$35