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Cheap flights from Ontario to Chicago from $108

1 adult
1 adult, Economy, 0 bags

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Ontario to Chicago

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
11:30 am - 9:18 amONT  Ontario-ORD Chicago O'Hare Intl
19h 48m2 stops Denver Intl Orlando
Frontier Logo
6:21 am - 10:17 pmORD  Chicago O'Hare Intl-ONT Ontario
17h 56m2 stops Las Vegas Harry Reid Intl Denver Intl
$263Frontier
Wed, Dec 2 - Sat, Dec 5
Frontier Logo
11:30 am - 9:18 amONT  Ontario-ORD Chicago O'Hare Intl
19h 48m2 stops Denver Intl Orlando
Frontier Logo
6:21 am - 10:17 pmORD  Chicago O'Hare Intl-ONT Ontario
17h 56m2 stops Las Vegas Harry Reid Intl Denver Intl
$264Frontier
Thu, Dec 3 - Sat, Dec 5
Delta Logo
1:09 pm - 11:57 pmONT  Ontario-ORD Chicago O'Hare Intl
8h 48m1 stop Atlanta Hartsfield-Jackson
Delta Logo
1:54 pm - 11:57 pmORD  Chicago O'Hare Intl-ONT Ontario
12h 03m2 stops Detroit Metropolitan Wayne County Salt Lake City
$264Delta
Fri, Feb 5 - Mon, Feb 8
Delta Logo
6:00 am - 6:32 pmONT  Ontario-ORD Chicago O'Hare Intl
10h 32m2 stops Salt Lake City Detroit Metropolitan Wayne County
Delta Logo
6:59 pm - 11:57 pmORD  Chicago O'Hare Intl-ONT Ontario
6h 58m1 stop Salt Lake City
$264Delta
Thu, Feb 4 - Mon, Feb 8
United Airlines Logo
7:00 am - 1:11 pmONT  Ontario-ORD Chicago O'Hare Intl
4h 11mnonstop
United Airlines Logo
3:00 pm - 8:38 pmORD  Chicago O'Hare Intl-ONT Ontario
7h 38m1 stop San Francisco
$267United Airlines
Thu, Dec 10 - Mon, Dec 14
United Airlines Logo
7:00 am - 1:00 pmONT  Ontario-ORD Chicago O'Hare Intl
4h 00mnonstop
United Airlines Logo
3:55 pm - 10:15 pmORD  Chicago O'Hare Intl-ONT Ontario
8h 20m1 stop Houston George Bush Intcntl
$270United Airlines
Sat, Jan 16 - Mon, Jan 18
Multiple Airlines Logo
2:01 pm - 10:01 amONT  Ontario-ORD Chicago O'Hare Intl
18h 00m2 stops Las Vegas Harry Reid Intl Minneapolis St Paul
Multiple Airlines Logo
7:25 am - 12:20 amORD  Chicago O'Hare Intl-ONT Ontario
18h 55m1 stop Denver Intl
$278Multiple Airlines
Thu, Nov 26 - Thu, Dec 10
Multiple Airlines Logo
6:00 am - 12:53 amONT  Ontario-ORD Chicago O'Hare Intl
16h 53m1 stop Denver Intl
Multiple Airlines Logo
2:55 pm - 12:17 amORD  Chicago O'Hare Intl-ONT Ontario
11h 22m3 stops Kirksville Cannon Memorial Dallas/Fort Worth Denver Intl
$293Multiple Airlines
Tue, Dec 1 - Thu, Dec 3
American Airlines Logo
6:00 am - 12:03 pmONT  Ontario-ORD Chicago O'Hare Intl
4h 03mnonstop
American Airlines Logo
9:30 pm - 11:59 pmORD  Chicago O'Hare Intl-ONT Ontario
4h 29mnonstop
$308American Airlines
Fri, Dec 18 - Sun, Dec 20
American Airlines Logo
11:59 pm - 10:05 amONT  Ontario-ORD Chicago O'Hare Intl
8h 06m1 stop Dallas/Fort Worth
American Airlines Logo
9:30 pm - 11:59 pmORD  Chicago O'Hare Intl-ONT Ontario
4h 29mnonstop
$318American Airlines
Mon, Dec 14 - Thu, Dec 17

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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
Dec 3
ONT7:00 amOntario
12h 56m
2 stops
ORD9:56 pmChicago O'Hare Intl
Dec 8
ORD5:30 amChicago O'Hare Intl
7h 37m
1 stop
ONT11:07 amOntario
$264
Delta
Nov 26
ONT7:05 amOntario
10h 34m
2 stops
ORD7:39 pmChicago O'Hare Intl
Dec 4
ORD12:34 pmChicago O'Hare Intl
12h 25m
2 stops
ONT10:59 pmOntario
$269
Delta
Nov 26
ONT12:18 pmOntario
9h 02m
1 stop
ORD11:20 pmChicago O'Hare Intl
Dec 6
ORD7:25 amChicago O'Hare Intl
6h 52m
1 stop
ONT12:17 pmOntario
$303

United Airlines flights from Ontario to Chicago O'Hare Intl Airport

Our best United Airlines deals on Ontario to Chicago O'Hare Intl Airport flight tickets
United Airlines
Dec 5
ONT7:00 amOntario
4h 11m
ORD1:11 pmChicago O'Hare Intl
Dec 8
ORD4:15 pmChicago O'Hare Intl
4h 29m
ONT6:44 pmOntario
$272
United Airlines
Dec 4
ONT7:00 amOntario
4h 11m
ORD1:11 pmChicago O'Hare Intl
Dec 8
ORD4:15 pmChicago O'Hare Intl
4h 29m
ONT6:44 pmOntario
$277
United Airlines
Dec 2
ONT7:00 amOntario
4h 11m
ORD1:11 pmChicago O'Hare Intl
Dec 9
ORD4:15 pmChicago O'Hare Intl
4h 29m
ONT6:44 pmOntario
$289

momondo Fare Finder

 
Use the filters below to find and compare flights from Ontario to Chicago O'Hare Intl Airport that are best for you.

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Fly to

Route

Depart

Return

Price

Cheapest round-trip

OntarioChicago

ONT Ontario - ORD Chicago O'Hare Intl

ONTORD

Ontario

Wed 12/2

11:30 am-9:18 am

2 stops19h 48m

Chicago O'Hare Intl

Sat 12/5

6:21 am-10:17 pm

2 stops17h 56m

$263

OntarioChicago

ONT Ontario - ORD Chicago O'Hare Intl

ONTORD

Ontario

Thu 12/3

11:30 am-9:18 am

2 stops19h 48m

Chicago O'Hare Intl

Sat 12/5

6:21 am-10:17 pm

2 stops17h 56m

$264

OntarioChicago

ONT Ontario - ORD Chicago O'Hare Intl

ONTORD

Ontario

Fri 2/5

1:09 pm-11:57 pm

1 stop8h 48m

Chicago O'Hare Intl

Mon 2/8

1:54 pm-11:57 pm

2 stops12h 03m

$264

OntarioChicago

ONT Ontario - ORD Chicago O'Hare Intl

ONTORD

Ontario

Thu 2/4

6:00 am-6:32 pm

2 stops10h 32m

Chicago O'Hare Intl

Mon 2/8

6:59 pm-11:57 pm

1 stop6h 58m

$264

OntarioChicago

ONT Ontario - ORD Chicago O'Hare Intl

ONTORD

Ontario

Thu 12/10

7:00 am-1:11 pm

Nonstop4h 11m

Chicago O'Hare Intl

Mon 12/14

3:00 pm-8:38 pm

1 stop7h 38m

$267

OntarioChicago

ONT Ontario - ORD Chicago O'Hare Intl

ONTORD

Ontario

Sat 1/16

7:00 am-1:00 pm

Nonstop4h 00m

Chicago O'Hare Intl

Mon 1/18

3:55 pm-10:15 pm

1 stop8h 20m

$270

OntarioChicago

ONT Ontario - ORD Chicago O'Hare Intl

ONTORD

Ontario

Thu 11/26

2:01 pm-10:01 am

2 stops18h 00m

Chicago O'Hare Intl

Thu 12/10

7:25 am-12:20 am

1 stop18h 55m

$278

OntarioChicago

ONT Ontario - ORD Chicago O'Hare Intl

ONTORD

Ontario

Tue 12/1

6:00 am-12:53 am

1 stop16h 53m

Chicago O'Hare Intl

Thu 12/3

2:55 pm-12:17 am

3 stops11h 22m

$293
Quickest round-trip

OntarioChicago

ONT Ontario - ORD Chicago O'Hare Intl

ONTORD

Ontario

Fri 12/18

6:00 am-12:03 pm

Nonstop4h 03m

Chicago O'Hare Intl

Sun 12/20

9:30 pm-11:59 pm

Nonstop4h 29m

$308

OntarioChicago

ONT Ontario - ORD Chicago O'Hare Intl

ONTORD

Ontario

Mon 12/14

11:59 pm-10:05 am

1 stop8h 06m

Chicago O'Hare Intl

Thu 12/17

9:30 pm-11:59 pm

Nonstop4h 29m

$318

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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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 typical price of a round-trip flight between Ontario and Chicago O'Hare Intl Airport?

Prices are currently low for flights on this route.

Typical prices usually range from $292 to $487.
The lowest price recently found on this route was $263.

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

The month of February is another great option to travel to Chicago O'Hare Intl Airport, with average flight prices from Ontario averaging around $365.

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 $408. This is often the case because there is less demand to fly during this day of the week. On the other hand, Monday 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 $523.

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 $385 when looking at flights departing in the afternoon. Try not to purchase tickets at noon because they tend to be around $561. 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 from Ontario to Chicago O'Hare Intl Airport?

You are more likely to see cheaper flights to Chicago O'Hare Intl Airport from Ontario when booking weeks ahead of your departure date. In general, you can expect to find flights to Chicago O'Hare Intl Airport for around $406 when searching 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 $367 on momondo.

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

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

Can stopping save me money on Ontario to Chicago O'Hare Intl Airport flights?

You could potentially save up to 25% on your flight if you consider stops on a Ontario to Chicago O'Hare Intl Airport flight.

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

As of November 2026, prices for Ontario to Chicago O'Hare Intl Airport flights are approximately 16% 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

$108

Fastest flight time

3h 54m

Direct flights

Every day
The best one-way flight to Chicago O'Hare Intl Airport from Ontario in the past 72 hours is $108. The best round-trip flight deal from Ontario to Chicago O'Hare Intl Airport found on momondo in the last 72 hours is $263.
The fastest flight from Ontario to Chicago O'Hare Intl Airport takes 3h 54m
Direct flights go from Ontario to Chicago O'Hare Intl Airport every day.
Search flight deals

Frequently asked questions about flying from Ontario to Chicago O'Hare Intl Airport

  • 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 3h 54m.

  • 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
DeltaPriceFrom $118Free CancellationRating
7.8
8,698 reviews
Search Delta flights
FrontierPriceFrom $160Free CancellationRating
5.5
2,512 reviews
Search Frontier flights
United AirlinesPriceFrom $272Free CancellationRating
7.3
10,459 reviews
Search United Airlines flights
American AirlinesPriceFrom $276Free CancellationRating
7.0
12,231 reviews
Search American Airlines flights

  • United Airlines Flights From Ontario to Chicago O'Hare Intl Airport

    The lowest priced United Airlines flight from Ontario to Chicago O'Hare Intl Airport from the last 72 hours was $272. Generally, United Airlines has 1 flight on this route every week with an average price of $446. United Airlines is rated 7.3/10 by our users.

Traveling to a place near Chicago?

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

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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