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Cheap flights from Ontario to Chicago from $99

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Ontario to Chicago departing on 5/23. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Find the cheapest flights from Ontario to Chicago

Cheap round-trip flights

These are some of the best round-trip flight deals from Ontario to Chicago that have been recently found on momondo from popular airlines, departing in the coming months.
Frontier Logo
12:59 am - 11:52 pmONT-ORD
20h 53m1 stop
Frontier Logo
6:00 am - 9:12 amORD-ONT
29h 12m1 stop
$202Frontier
Find Deal
Fri, May 30 - Sat, Jun 7
Frontier Logo
5:21 pm - 11:52 pmONT-ORD
28h 31m1 stop
Frontier Logo
6:00 am - 9:12 amORD-ONT
29h 12m1 stop
$208Frontier
Find Deal
Wed, May 28 - Sat, May 31
United Airlines Logo
7:00 am - 1:03 pmONT-ORD
4h 03mnonstop
United Airlines Logo
7:55 pm - 10:26 pmORD-ONT
4h 31mnonstop
$227United Airlines
Find Deal
Fri, Jun 6 - Tue, Jun 10
United Airlines Logo
7:00 am - 1:03 pmONT-ORD
4h 03mnonstop
United Airlines Logo
12:45 pm - 5:25 pmORD-ONT
6h 40m1 stop
$237United Airlines
Find Deal
Fri, Jun 6 - Tue, Jun 10
Southwest Logo
12:55 pm - 10:20 pmONT-ORD
7h 25m1 stop
Southwest Logo
6:55 pm - 10:55 pmORD-ONT
6h 00m1 stop
$247Southwest
Find Deal
Thu, Aug 14 - Fri, Aug 15
American Airlines Logo
4:50 pm - 12:32 amONT-ORD
5h 42m1 stop
American Airlines Logo
4:45 pm - 9:38 pmORD-ONT
6h 53m1 stop
$249American Airlines
Find Deal
Sat, Jun 14 - Sat, Jun 21
Southwest Logo
12:55 pm - 10:20 pmONT-ORD
7h 25m1 stop
Southwest Logo
7:00 am - 12:40 pmORD-ONT
7h 40m2 stops
$252Southwest
Find Deal
Thu, Aug 14 - Fri, Aug 15
Delta Logo
1:15 pm - 10:09 pmONT-ORD
6h 54m1 stop
Delta Logo
7:20 pm - 11:46 pmORD-ONT
6h 26m1 stop
$257Delta
Find Deal
Wed, Jun 11 - Tue, Jun 24
Delta Logo
7:05 pm - 8:34 amONT-ORD
11h 29m2 stops
Delta Logo
7:20 pm - 11:46 pmORD-ONT
6h 26m1 stop
$262Delta
Find Deal
Fri, Jun 6 - Fri, Jun 13
American Airlines Logo
12:59 am - 10:10 amONT-ORD
7h 11m1 stop
American Airlines Logo
4:45 pm - 9:38 pmORD-ONT
6h 53m1 stop
$273American Airlines
Find Deal
Mon, Jun 16 - Sat, Jun 21

Delta flights from Ontario to Chicago O'Hare Intl Airport

Our best Delta deals on Ontario to Chicago O'Hare Intl Airport flight tickets
Delta
Jun 11
ONT1:15 pmOntario
6h 54m
1 stop
ORD10:09 pmChicago O'Hare Intl
Jun 24
ORD7:20 pmChicago O'Hare Intl
6h 26m
1 stop
ONT11:46 pmOntario
Delta
Jun 6
ONT7:05 pmOntario
11h 29m
2 stops
ORD8:34 amChicago O'Hare Intl
Jun 13
ORD7:20 pmChicago O'Hare Intl
6h 26m
1 stop
ONT11:46 pmOntario
Delta
May 29
ONT10:01 amOntario
11h 57m
2 stops
ORD11:58 pmChicago O'Hare Intl
Jun 2
ORD11:03 amChicago O'Hare Intl
13h 32m
2 stops
ONT10:35 pmOntario

Southwest flights from Ontario to Chicago O'Hare Intl Airport

Our best Southwest deals on Ontario to Chicago O'Hare Intl Airport flight tickets
Southwest
Aug 14
ONT12:55 pmOntario
7h 25m
1 stop
ORD10:20 pmChicago O'Hare Intl
Aug 15
ORD6:55 pmChicago O'Hare Intl
6h 00m
1 stop
ONT10:55 pmOntario
Southwest
Aug 14
ONT12:55 pmOntario
7h 25m
1 stop
ORD10:20 pmChicago O'Hare Intl
Aug 15
ORD7:00 amChicago O'Hare Intl
7h 40m
2 stops
ONT12:40 pmOntario
Southwest
Jul 30
ONT1:45 pmOntario
7h 55m
1 stop
ORD11:40 pmChicago O'Hare Intl
Aug 4
ORD6:15 amChicago O'Hare Intl
5h 45m
1 stop
ONT10:00 amOntario

See travel insights to Chicago from

How to get the cheapest flight ticket from Ontario to Chicago O'Hare Intl Airport

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to Chicago O'Hare Intl Airport?

The month of October is another great option to travel to Chicago O'Hare Intl Airport, with average flight prices from Ontario averaging around $248.

What is the cheapest day to depart on your flight to Chicago O'Hare Intl Airport?

The cheapest day to depart on your flight to Chicago O'Hare Intl Airport is on a Wednesday when prices can be found for as low as $372. This is often the case because there is less demand to fly during this day of the week. On the other hand, Sunday is the most expensive day to depart from Ontario because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $478.

What is the cheapest time of day to depart on your flight to Chicago O'Hare Intl Airport?

Flying to Chicago O'Hare Intl Airport from Ontario in the afternoon is the least expensive time of day to depart. momondo users have found prices as low as $309 when looking at flights departing in the afternoon. Try not to purchase tickets at noon because they tend to be around $467. Of course, these prices can vary depending on the time of year and what airport you fly to.

What is the cheapest Ontario to Chicago O'Hare Intl flight route?

Fly from Ontario to Chicago O'Hare Intl for the best Ontario - Chicago O'Hare Intl flight prices

How far in advance should I book a flight to Chicago O'Hare Intl Airport?

You are more likely to see cheaper flights to Chicago O'Hare Intl Airport from Ontario when booking 4 weeks ahead of your departure date. In general, you can expect to find flights to Chicago O'Hare Intl Airport for around $351 when searching 4 weeks out.However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Chicago O'Hare Intl Airport from Ontario for as low as $261 on momondo.

What cabin class options are available on Ontario to Chicago O'Hare Intl flights?

There are 4 cabin classes available to choose from on Ontario to Chicago O'Hare Intl flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

How have Ontario to Chicago O'Hare Intl Airport flight prices changed over time?

As of April 2025, prices for Ontario to Chicago O'Hare Intl Airport flights are approximately 22% cheaper when compared to flights at the same time last year.

When to book flights from Ontario to Chicago O'Hare Intl Airport

Are you open to changing your travel dates? Check out the ideal times to fly from Ontario to Chicago O'Hare Intl Airport according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Ontario to Chicago O'Hare Intl Airport (ONT to ORD) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Ontario to Chicago O'Hare Intl Airport

Best Price Found

$99

Fastest flight time

3h 58m

Direct flights

Every day
The best one-way flight to Chicago O'Hare Intl Airport from Ontario in the past 72 hours is $99. The best round-trip flight deal from Ontario to Chicago O'Hare Intl Airport found on momondo in the last 72 hours is $202.
The fastest flight from Ontario to Chicago O'Hare Intl Airport takes 3h 58m
Direct flights go from Ontario to Chicago O'Hare Intl Airport every day.

  • How far is Ontario to Chicago O'Hare Intl by plane?

    Chicago O'Hare Intl is 1697.7 mi away from Ontario. In terms of flight time, this usually takes a little over 4h 03m.

  • When did momondo last update prices for flights from Ontario Airport to Chicago O'Hare Intl Airport?

    Prices for flights from Ontario Airport to Chicago O'Hare Intl Airport are updated daily.

  • How many operators does momondo search for flights from Ontario Airport to Chicago O'Hare Intl Airport?

  • How old do you have to be to fly from Ontario Airport to Chicago O'Hare Intl Airport?

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Ontario Airport to Chicago O'Hare Intl Airport.

  • What documentation or ID do you need to fly to Chicago O'Hare Intl Airport?

    The necessary travel and health documents for your Chicago O'Hare Intl Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

  • What is the most popular plane model from Ontario to Chicago O'Hare Intl Airport?

  • What is the most popular airline from Ontario to Chicago O'Hare Intl Airport?


Best airlines flying from Ontario to Chicago O'Hare Intl Airport

Compare and see reviews for airlines that fly from Ontario to Chicago O'Hare Intl Airport with momondo
Airline
Rating
Free Cancellation
Price
Spirit AirlinesPriceFrom $74Free CancellationRating
6.3
7,963 reviews
Search Spirit Airlines flights
FrontierPriceFrom $108Free CancellationRating
5.9
3,287 reviews
Search Frontier flights
Alaska AirlinesPriceFrom $161Free CancellationRating
8.0
9,968 reviews
Search Alaska Airlines flights
United AirlinesPriceFrom $227Free CancellationRating
7.4
8,696 reviews
Search United Airlines flights
DeltaPriceFrom $241Free CancellationRating
8.0
7,936 reviews
Search Delta flights
American AirlinesPriceFrom $245Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
SouthwestPriceFrom $272Free CancellationRating
8.0
4,294 reviews
Search Southwest flights
  • Southwest Flights From Ontario to Chicago O'Hare Intl Airport

    The lowest priced Southwest flight from Ontario to Chicago O'Hare Intl Airport from the last 72 hours was $272. Generally, Southwest has 2 flights on this route every week with an average price of $480. Southwest is rated 8.0/10 by our users.


Traveling to a place near Chicago?

Book flights to Chicago if you plan to visit one of these locations
Lake Geneva
Rockford
Schaumburg
Merrillville
Gurnee
Rosemont
Naperville
Kenosha
South Haven
Joliet
Oak Brook
Racine
New Buffalo
Elgin
Tinley Park
Hammond
Aurora
Orland Park
Waukegan
Janesville

Why use momondo?

Why should I use momondo to find a flight deal from Ontario to Chicago?

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Chicago from Ontario.

Can I find flights from Ontario to Chicago with flexible booking policies on momondo?

All flight searches from Ontario to Chicago on momondo can be filtered to show those which offer flexible booking policies.

How can momondo help me find flights from Ontario to Chicago?

Once all potential Ontario to Chicago flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

I’m not ready to book a flight from Ontario to Chicago right now. Can momondo alert me if prices change?

If you are simply researching potential flights to Chicago, momondo offers a useful price alert feature which will track prices for flights to Chicago from Ontario and alert you when they change.


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1 adult
Mon 5/5
Mon 5/12

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