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$53 Find Cheap Flights from Illinois 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 2/25. 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

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Good to know

Low season

January

High season

October

Cheapest flight

$53
Best time to beat the crowds with an average 1% drop in price.
Most popular time to fly and prices are also 1% lower on average.
Flight from Chicago O'Hare Airport to Ontario

FAQs for booking flights from Illinois to Ontario

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

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

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

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

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

Nonstop departures

Illinois to Ontario

Monday

Aeromexico, Air Canada, Air France, +20 more

Aeromexico, Air Canada, +21 more

Tuesday

Aeromexico, Air Canada, Air France, +22 more

Aeromexico, Air Canada, +23 more

Wednesday

Aeromexico, Air Canada, Air France, +22 more

Aeromexico, Air Canada, +23 more

Thursday

Aeromexico, Air Canada, Air France, +22 more

Aeromexico, Air Canada, +23 more

Friday

Aeromexico, Air Canada, Air France, +20 more

Aeromexico, Air Canada, +21 more

Saturday

Aeromexico, Air Canada, Air France, +21 more

Aeromexico, Air Canada, +22 more

Sunday

Aeromexico, Air Canada, Air France, +21 more

Aeromexico, Air Canada, +22 more

See more direct flights

Nonstop returns

Ontario to Illinois

Monday

Aeromexico, Air Canada, Air France, +20 more

Aeromexico, Air Canada, +21 more

Tuesday

Aeromexico, Air Canada, Air France, +22 more

Aeromexico, Air Canada, +23 more

Wednesday

Aeromexico, Air Canada, Air France, +22 more

Aeromexico, Air Canada, +23 more

Thursday

Aeromexico, Air Canada, Air France, +22 more

Aeromexico, Air Canada, +23 more

Friday

Aeromexico, Air Canada, Air France, +20 more

Aeromexico, Air Canada, +21 more

Saturday

Aeromexico, Air Canada, Air France, +21 more

Aeromexico, Air Canada, +22 more

Sunday

Aeromexico, Air Canada, Air France, +21 more

Aeromexico, Air Canada, +22 more

See more direct flights
See more direct flights

Book cheap flights from Illinois to Ontario

Recent round-trip flight deals

1/9qui
1 stopFrontier
18h 31mORD-ONT
1/11sáb
1 stopFrontier
19h 26mONT-ORD
$105
11/14qui
1 stopFrontier
7h 54mORD-ONT
11/20qua
1 stopFrontier
9h 00mONT-ORD
$106
2/5qua
1 stopAlaska Airlines
14h 28mORD-ONT
2/9dom
1 stopAlaska Airlines
10h 26mONT-ORD
$242
3/4ter
1 stopAmerican Airlines
9h 05mORD-ONT
3/5qua
1 stopAmerican Airlines
5h 59mONT-ORD
$246
12/12qui
2 stopsDelta
12h 08mORD-ONT
12/16seg
1 stopDelta
8h 20mONT-ORD
$255
12/7sáb
1 stopDelta
7h 46mORD-ONT
12/25qua
1 stopDelta
6h 21mONT-ORD
$256
2/5qua
2 stopsAlaska Airlines
11h 19mORD-ONT
2/9dom
1 stopAlaska Airlines
10h 26mONT-ORD
$257
12/16seg
1 stopUnited Airlines
9h 48mORD-ONT
12/21sáb
1 stopUnited Airlines
8h 17mONT-ORD
$278
2/1sáb
1 stopAmerican Airlines
8h 48mMLI-ONT
2/4ter
2 stopsAmerican Airlines
9h 58mONT-MLI
$293
12/11qua
1 stopUnited Airlines
9h 48mORD-ONT
12/17ter
1 stopUnited Airlines
5h 41mONT-ORD
$332

Search by stops

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Recent one-way flight deals

2/25ter
1 stopFrontier
6h 32mORD-ONT
$53
11/14qui
1 stopFrontier
7h 08mMDW-ONT
$53
12/7sáb
1 stopUnited Airlines
9h 48mORD-ONT
$119
1/29qua
1 stopAlaska Airlines
8h 06mORD-ONT
$121
1/7ter
1 stopDelta
10h 20mORD-ONT
$122
2/28sex
1 stopAlaska Airlines
9h 53mORD-ONT
$123
3/5qua
1 stopAmerican Airlines
7h 10mORD-ONT
$124
2/4ter
2 stopsDelta
11h 35mORD-ONT
$127
12/24ter
1 stopUnited Airlines
8h 14mORD-ONT
$163
2/5qua
2 stopsAmerican Airlines
8h 37mORD-ONT
$178

Search by stops

Search by airline

Search by price

Last minute flights from Illinois to Ontario

Last minute flight, train and bus deals

11/5ter
multi-stopFrontier
16h 19mMDW-ONT
11/14qui
multi-stopFrontier
21h 04mONT-MDW
$142
11/5ter
multi-stopFrontier
16h 19mMDW-ONT
11/6qua
multi-stopFrontier
25h 08mONT-MDW
$150
11/2sáb
multi-stopDelta
10h 20mORD-ONT
11/6qua
multi-stopDelta
12h 50mONT-ORD
$423
11/2sáb
multi-stopDelta
12h 25mORD-ONT
11/6qua
multi-stopDelta
12h 50mONT-ORD
$428
11/5ter
multi-stopSouthwest
6h 30mORD-ONT
11/7qui
multi-stopSouthwest
6h 05mONT-ORD
$444
11/5ter
multi-stopSouthwest
8h 15mMDW-ONT
11/7qui
multi-stopSouthwest
6h 20mONT-MDW
$444
11/1sex
multi-stopAlaska Airlines
9h 04mORD-ONT
11/1sex
multi-stopAlaska Airlines
8h 30mONT-ORD
$508
11/3dom
multi-stopAlaska Airlines
9h 04mORD-ONT
11/16sáb
multi-stopAlaska Airlines
14h 59mONT-ORD
$546
11/1sex
multi-stopUnited Airlines
8h 12mORD-ONT
11/2sáb
multi-stopUnited Airlines
11h 47mONT-ORD
$603
11/5ter
multi-stopUnited Airlines
28h 44mSTL-ONT
11/8sex
multi-stopUnited Airlines
13h 40mONT-STL
$654

Search by stops

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Search by price

Everything you need to know for your flight to Ontario

Information on the airport you'll fly into in Ontario