Find flights
When to book
FAQs & Tips
Direct Flights
Deals

Find deals on international flights to Ontario from $33

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 6/4. 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
Sat 6/15
Sat 6/22

Search hundreds of travel sites at once for cheap international flights to Ontario

In the last 7 days travelers have searched 42,211,976 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.

Good to know

Low season

January

High season

December

Cheapest flight

$33
Best time to beat the crowds with an average 14% drop in price.
Most popular time to fly with an average 9% increase in price.
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

5/26Sun
nonstopFrontier
1h 24mSFO-ONT
6/11Tue
nonstopFrontier
1h 28mONT-SFO
$38
6/22Sat
nonstopFrontier
1h 23mSFO-ONT
6/25Tue
nonstopFrontier
1h 27mONT-SFO
$39
6/19Wed
nonstopDelta
2h 45mSEA-ONT
6/25Tue
1 stopDelta
6h 59mONT-SEA
$166
6/26Wed
nonstopDelta
2h 45mSEA-ONT
7/10Wed
1 stopDelta
7h 01mONT-SEA
$186
8/31Sat
1 stopAmerican Airlines
8h 31mJFK-ONT
9/7Sat
1 stopAmerican Airlines
7h 05mONT-JFK
$254
8/31Sat
1 stopAmerican Airlines
8h 31mJFK-ONT
9/7Sat
1 stopAmerican Airlines
7h 05mONT-JFK
$255
8/31Sat
nonstopJetBlue
5h 58mJFK-ONT
9/7Sat
nonstopJetBlue
5h 23mONT-JFK
$295
5/29Wed
nonstopJetBlue
6h 10mJFK-ONT
6/11Tue
nonstopJetBlue
5h 20mONT-JFK
$297
5/30Thu
1 stopUnited Airlines
9h 45mEWR-ONT
6/4Tue
1 stopUnited Airlines
8h 15mONT-EWR
$337
5/25Sat
1 stopUnited Airlines
10h 27mEWR-ONT
5/30Thu
2 stopsUnited Airlines
10h 05mONT-EWR
$361

Search by stops

Search by airline

Search by price

Recent one-way flight deals

6/4Tue
nonstopFrontier
2h 44mSEA-ONT
$33
5/27Mon
nonstopFrontier
1h 24mSFO-ONT
$33
6/18Tue
nonstopDelta
2h 45mSEA-ONT
$79
8/13Tue
1 stopDelta
4h 29mSEA-ONT
$88
5/28Tue
1 stop
13h 08mEWR-ONT
$92
7/18Thu
nonstopAlaska Airlines
2h 33mSEA-ONT
$98
10/5Sat
1 stopAmerican Airlines
3h 49mDEN-ONT
$99
7/16Tue
nonstopAlaska Airlines
2h 33mSEA-ONT
$114
9/10Tue
1 stopAmerican Airlines
6h 43mSFO-ONT
$114
9/28Sat
3 stops
23h 12mORD-ONT
$435

Search by stops

Search by airline

Search by price

Last minute flights from Worldwide to Ontario

Last minute flight, train and bus deals

5/21Tue
nonstopFrontier
1h 24mSFO-ONT
5/28Tue
nonstopFrontier
1h 28mONT-SFO
$75
5/21Tue
nonstopFrontier
1h 24mSFO-ONT
5/26Sun
nonstopFrontier
1h 28mONT-SFO
$78
5/21Tue
multi-stopAmerican Airlines
8h 12mJFK-ONT
6/15Sat
multi-stopAmerican Airlines
8h 15mONT-JFK
$285
5/21Tue
multi-stopSouthwest
6h 55mSFO-ONT
5/22Wed
multi-stopSouthwest
8h 45mONT-SFO
$311
5/21Tue
multi-stopAmerican Airlines
8h 42mJFK-ONT
6/21Fri
multi-stopAmerican Airlines
10h 19mONT-JFK
$319
5/21Tue
multi-stopDelta
9h 43mDFW-ONT
5/28Tue
multi-stopDelta
9h 09mONT-DFW
$337
5/18Sat
multi-stopDelta
8h 40mJFK-ONT
5/20Mon
multi-stopDelta
9h 29mONT-JFK
$362
5/17Fri
nonstopUnited Airlines
1h 34mSFO-ONT
5/18Sat
nonstopUnited Airlines
1h 28mONT-SFO
$369
5/21Tue
nonstopUnited Airlines
1h 36mSFO-ONT
5/22Wed
nonstopUnited Airlines
1h 28mONT-SFO
$380
5/20Mon
multi-stopSouthwest
11h 35mLGA-ONT
5/23Thu
multi-stopSouthwest
10h 35mONT-LGA
$479

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
$29