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.

$98 CHEAP FLIGHTS from Illinois to Ontario

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Flight Deals

Cheap Flights from Illinois to Ontario

Discover the best prices for you by selecting your travel dates on KAYAK.

Round-trip

One-way

Last minute

Direct

Recent round-trip flight deals from Illinois to Ontario

Thu, Nov 12 - Mon, Nov 16

6:30 am - 11:51 pmORD Chicago O'Hare Intl-ONT Ontario

19h 21m1 stop Denver Intl

2:23 pm - 5:13 amONT Ontario-ORD Chicago O'Hare Intl

12h 50m1 stop Las Vegas Harry Reid Intl

$198Frontier

Tue, Nov 3 - Tue, Nov 10

10:40 am - 4:38 pmORD Chicago O'Hare Intl-ONT Ontario

7h 58m1 stop Dallas/Fort Worth

11:52 am - 12:21 amONT Ontario-ORD Chicago O'Hare Intl

10h 29m1 stop Denver Intl

$198Frontier

Wed, Oct 21 - Mon, Oct 26

6:30 am - 10:29 amORD Chicago O'Hare Intl-ONT Ontario

5h 59m1 stop Denver Intl

6:56 pm - 5:40 amONT Ontario-ORD Chicago O'Hare Intl

8h 44m1 stop Seattle/Tacoma Intl

$230Multiple Airlines

Wed, Dec 9 - Tue, Jan 12

6:21 am - 11:51 amORD Chicago O'Hare Intl-ONT Ontario

7h 30m1 stop Las Vegas Harry Reid Intl

11:36 am - 11:59 pmONT Ontario-ORD Chicago O'Hare Intl

10h 23m1 stop Seattle/Tacoma Intl

$230Multiple Airlines

Sat, Nov 7 - Sat, Nov 14

10:25 am - 12:45 pmMDW Chicago Midway-ONT Ontario

4h 20mnonstop

8:20 am - 2:05 pmONT Ontario-MDW Chicago Midway

3h 45mnonstop

$239Southwest

Sat, Nov 7 - Tue, Nov 10

10:25 am - 12:45 pmMDW Chicago Midway-ONT Ontario

4h 20mnonstop

1:35 pm - 10:40 pmONT Ontario-MDW Chicago Midway

7h 05m1 stop Dallas Love Field

$249Southwest

Sat, Oct 24 - Sat, Oct 31

3:50 pm - 8:58 pmORD Chicago O'Hare Intl-ONT Ontario

7h 08m1 stop Denver Intl

6:59 am - 1:02 pmONT Ontario-ORD Chicago O'Hare Intl

4h 03mnonstop

$249United Airlines

Wed, Oct 28 - Tue, Nov 10

4:15 pm - 6:47 pmORD Chicago O'Hare Intl-ONT Ontario

4h 32mnonstop

1:35 pm - 10:29 pmONT Ontario-ORD Chicago O'Hare Intl

6h 54m1 stop San Francisco

$249United Airlines

Tue, Jan 5 - Thu, Jan 7

7:30 am - 12:30 pmORD Chicago O'Hare Intl-ONT Ontario

7h 00m1 stop Salt Lake City

6:00 am - 3:27 pmONT Ontario-ORD Chicago O'Hare Intl

7h 27m1 stop Salt Lake City

$259Delta

Tue, Jan 5 - Wed, Jan 6

5:15 pm - 10:48 pmORD Chicago O'Hare Intl-ONT Ontario

7h 33m1 stop Salt Lake City

7:00 am - 4:37 pmONT Ontario-ORD Chicago O'Hare Intl

7h 37m1 stop Atlanta Hartsfield-Jackson

$259Delta

Recent last minute flight deals from Illinois to Ontario

Thu, Oct 1 - Wed, Oct 28

1:01 pm - 6:39 pmORD Chicago O'Hare Intl-ONT Ontario

7h 38m1 stop Dallas/Fort Worth

11:52 am - 12:21 amONT Ontario-ORD Chicago O'Hare Intl

10h 29m1 stop Denver Intl

$229Frontier

Wed, Sep 30 - Thu, Oct 22

6:30 am - 10:30 amORD Chicago O'Hare Intl-ONT Ontario

6h 00m1 stop Denver Intl

8:35 pm - 5:16 amONT Ontario-ORD Chicago O'Hare Intl

6h 41m1 stop Las Vegas Harry Reid Intl

$229Frontier

Thu, Oct 1 - Sat, Oct 17

1:01 pm - 6:39 pmORD Chicago O'Hare Intl-ONT Ontario

7h 38m1 stop Dallas/Fort Worth

6:02 am - 6:20 pmONT Ontario-ORD Chicago O'Hare Intl

10h 18m1 stop Seattle/Tacoma Intl

$259Multiple Airlines

Wed, Sep 30 - Tue, Oct 27

7:40 pm - 11:47 pmORD Chicago O'Hare Intl-ONT Ontario

6h 07m1 stop Salt Lake City

9:45 am - 6:10 pmONT Ontario-ORD Chicago O'Hare Intl

6h 25m1 stop Salt Lake City

$288Delta

Sat, Oct 3 - Tue, Oct 20

7:45 am - 12:14 pmORD Chicago O'Hare Intl-ONT Ontario

6h 29m1 stop Salt Lake City

1:35 pm - 10:05 pmONT Ontario-ORD Chicago O'Hare Intl

6h 30m1 stop Salt Lake City

$288Delta

Fri, Oct 2 - Mon, Oct 5

6:45 am - 12:50 pmMDW Chicago Midway-ONT Ontario

8h 05m1 stop Austin Bergstrom

11:55 pm - 5:40 amONT Ontario-MDW Chicago Midway

3h 45mnonstop

$307Southwest

Tue, Sep 29 - Sat, Oct 3

6:40 am - 10:15 amMDW Chicago Midway-ONT Ontario

5h 35m1 stop Denver Intl

11:55 pm - 5:40 amONT Ontario-MDW Chicago Midway

3h 45mnonstop

$307Southwest

Fri, Oct 2 - Fri, Oct 9

6:59 am - 12:06 pmORD Chicago O'Hare Intl-ONT Ontario

7h 07m1 stop Phoenix Sky Harbor Intl

4:29 pm - 12:35 amONT Ontario-ORD Chicago O'Hare Intl

6h 06m1 stop Phoenix Sky Harbor Intl

$317American Airlines

Sat, Oct 3 - Sat, Oct 17

7:00 am - 1:16 pmORD Chicago O'Hare Intl-ONT Ontario

8h 16m1 stop Seattle/Tacoma Intl

6:02 am - 6:20 pmONT Ontario-ORD Chicago O'Hare Intl

10h 18m1 stop Seattle/Tacoma Intl

$343Alaska Airlines

Sun, Oct 4 - Sun, Oct 18

6:59 am - 12:06 pmORD Chicago O'Hare Intl-ONT Ontario

7h 07m1 stop Phoenix Sky Harbor Intl

7:34 pm - 5:00 amONT Ontario-ORD Chicago O'Hare Intl

7h 26m1 stop Phoenix Sky Harbor Intl

$437American Airlines

Useful Info

Low season	January
High season	October
Cheapest flight	$98

Best time to beat the crowds with an average 8% drop in price.

Most popular time to fly and prices are also 16% lower on average.

Flight from Chicago O'Hare Airport 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.