ONT

$72 Find Cheap Flights from Illinois to Ontario - Compare and Save

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 10/3. 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
1 adult, Economy, 0 bags

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Flight Deals

Cheap Flights from Illinois to Ontario

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Illinois to Ontario that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Illinois to Ontario

Wed, Sep 2 - Sat, Sep 12
Frontier Logo
8:45 am - 7:01 pmORD  Chicago O'Hare Intl-ONT Ontario
12h 16m1 stop Houston George Bush Intcntl
Frontier Logo
11:45 am - 12:23 amONT  Ontario-ORD Chicago O'Hare Intl
10h 38m1 stop Denver Intl
$146Frontier
Tue, Sep 1 - Thu, Sep 10
Frontier Logo
8:45 am - 7:01 pmORD  Chicago O'Hare Intl-ONT Ontario
12h 16m1 stop Houston George Bush Intcntl
Frontier Logo
8:24 pm - 5:38 amONT  Ontario-ORD Chicago O'Hare Intl
7h 14m1 stop Las Vegas Harry Reid Intl
$146Frontier
Thu, Sep 10 - Mon, Sep 14
Southwest Logo
2:00 pm - 4:10 pmMDW  Chicago Midway-ONT Ontario
4h 10mnonstop
Southwest Logo
11:55 pm - 5:45 amONT  Ontario-MDW Chicago Midway
3h 50mnonstop
$165Southwest
Thu, Oct 29 - Mon, Nov 2
Southwest Logo
11:55 am - 2:10 pmMDW  Chicago Midway-ONT Ontario
4h 15mnonstop
Southwest Logo
11:55 pm - 5:40 amONT  Ontario-MDW Chicago Midway
3h 45mnonstop
$165Southwest
Thu, Sep 10 - Sat, Sep 19
United Airlines Logo
8:33 pm - 10:59 pmORD  Chicago O'Hare Intl-ONT Ontario
4h 26mnonstop
United Airlines Logo
7:00 am - 1:10 pmONT  Ontario-ORD Chicago O'Hare Intl
4h 10mnonstop
$167United Airlines
Thu, Sep 10 - Thu, Sep 24
United Airlines Logo
8:33 pm - 10:59 pmORD  Chicago O'Hare Intl-ONT Ontario
4h 26mnonstop
United Airlines Logo
1:24 pm - 11:59 pmONT  Ontario-ORD Chicago O'Hare Intl
8h 35m1 stop Denver Intl
$177United Airlines
Sat, Sep 5 - Thu, Dec 24
Delta Logo
7:00 am - 2:08 pmORD  Chicago O'Hare Intl-ONT Ontario
9h 08m1 stop Seattle/Tacoma Intl
Delta Logo
10:59 pm - 8:34 amONT  Ontario-ORD Chicago O'Hare Intl
7h 35m1 stop Atlanta Hartsfield-Jackson
$237Delta
Fri, Dec 25 - Wed, Jan 6
Delta Logo
6:59 pm - 11:48 pmORD  Chicago O'Hare Intl-ONT Ontario
6h 49m1 stop Salt Lake City
Delta Logo
7:00 am - 4:37 pmONT  Ontario-ORD Chicago O'Hare Intl
7h 37m1 stop Atlanta Hartsfield-Jackson
$237Delta
Wed, Sep 9 - Wed, Sep 16
Multiple Airlines Logo
6:30 am - 10:30 amORD  Chicago O'Hare Intl-ONT Ontario
6h 00m1 stop Denver Intl
Multiple Airlines Logo
12:12 pm - 11:59 pmONT  Ontario-ORD Chicago O'Hare Intl
9h 47m1 stop Seattle/Tacoma Intl
$237Multiple Airlines
Thu, Oct 1 - Thu, Oct 1
Multiple Airlines Logo
6:00 am - 2:16 pmORD  Chicago O'Hare Intl-ONT Ontario
10h 16m1 stop Seattle/Tacoma Intl
Multiple Airlines Logo
8:24 pm - 5:38 amONT  Ontario-ORD Chicago O'Hare Intl
7h 14m1 stop Las Vegas Harry Reid Intl
$244Multiple Airlines
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Good to know

Low season

January

Cheapest flight

$72
Best time to beat the crowds with an average 10% drop in price.
Most popular time to fly with an average 2% increase in price.
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.

Everything you need to know for your flight to Ontario

Information on the airport you'll fly into in Ontario

Ontario (ONT)