Latest deals
Insights
When to book
FAQs
Reviews
Price Alerts

Cheap flights from Ontario to Chicago from $67

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 4/13. 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

Discover deals from 900+ travel sites with momondo.

Save money when you book flights with momondo

Big names and deals

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

Find the cheapest flights from Ontario to Chicago

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
2:44 pm - 5:31 am
ONT
-
ORD
12h 47m
1 stop
Multiple Airlines Logo
9:18 pm - 8:04 am
ORD
-
ONT
12h 46m
1 stop
$154Multiple Airlines
Wed, Apr 22 - Sun, Apr 26
Multiple Airlines Logo
7:29 pm - 5:31 am
ONT
-
ORD
8h 02m
1 stop
Multiple Airlines Logo
9:18 pm - 8:04 am
ORD
-
ONT
12h 46m
1 stop
$175Multiple Airlines
Wed, May 13 - Sun, May 17
Frontier Logo
3:30 pm - 6:08 am
ONT
-
ORD
12h 38m
1 stop
Frontier Logo
12:35 pm - 9:03 pm
ORD
-
ONT
10h 28m
1 stop
$181Frontier
Mon, Mar 23 - Wed, Mar 25
Frontier Logo
12:59 am - 9:50 am
ONT
-
ORD
6h 51m
1 stop
Frontier Logo
9:18 pm - 6:34 pm
ORD
-
ONT
23h 16m
1 stop
$182Frontier
Thu, May 14 - Tue, May 19
Frontier Logo
7:18 pm - 6:47 am
ONT
-
ORD
9h 29m
1 stop
Frontier Logo
9:18 pm - 8:04 am
ORD
-
ONT
12h 46m
1 stop
$190Frontier
Sat, Apr 18 - Sun, Apr 19
Frontier Logo
12:59 am - 9:50 am
ONT
-
ORD
6h 51m
1 stop
Frontier Logo
9:18 pm - 8:04 am
ORD
-
ONT
12h 46m
1 stop
$194Frontier
Thu, May 14 - Sun, May 17
Frontier Logo
12:59 am - 9:50 am
ONT
-
ORD
6h 51m
1 stop
Frontier Logo
9:18 pm - 1:40 pm
ORD
-
ONT
18h 22m
1 stop
$195Frontier
Wed, Apr 29 - Mon, May 4
Frontier Logo
3:24 pm - 5:26 pm
ONT
-
ORD
24h 02m
1 stop
Frontier Logo
8:39 am - 2:29 pm
ORD
-
ONT
7h 50m
1 stop
$196Frontier
Thu, Feb 26 - Sun, Mar 1
Frontier Logo
7:29 pm - 6:47 am
ONT
-
ORD
9h 18m
1 stop
Frontier Logo
4:55 pm - 10:42 pm
ORD
-
ONT
7h 47m
1 stop
$200Frontier
Tue, Apr 14 - Sat, Apr 18
Frontier Logo
7:18 pm - 6:47 am
ONT
-
ORD
9h 29m
1 stop
Frontier Logo
10:55 am - 11:55 pm
ORD
-
ONT
15h 00m
1 stop
$201Frontier
Sat, Apr 18 - Mon, Apr 20

Frontier flights from Ontario to Chicago O'Hare Intl Airport

Our best Frontier deals on Ontario to Chicago O'Hare Intl Airport flight tickets
Frontier
Mar 23
ONT3:30 pmOntario
12h 38m
1 stop
ORD6:08 amChicago O'Hare Intl
Mar 25
ORD12:35 pmChicago O'Hare Intl
10h 28m
1 stop
ONT9:03 pmOntario
$181
Frontier
May 14
ONT12:59 amOntario
6h 51m
1 stop
ORD9:50 amChicago O'Hare Intl
May 19
ORD9:18 pmChicago O'Hare Intl
23h 16m
1 stop
ONT6:34 pmOntario
$182
Frontier
Apr 18
ONT8:00 amOntario
13h 37m
1 stop
ORD11:37 pmChicago O'Hare Intl
Apr 22
ORD9:18 pmChicago O'Hare Intl
12h 46m
1 stop
ONT8:04 amOntario
$190

momondo Fare Finder

 
Customize your flight search to find flights from Ontario to Chicago O'Hare Intl Airport that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated February 9, 2026.
Use the filters below to find and compare flights from Ontario to Chicago O'Hare Intl Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

OntarioChicago

ONT - ORD

ONTORD

Ontario

Wed 4/22

2:44 pm-5:31 am

1 stop12h 47m

Chicago O'Hare Intl

Sun 4/26

9:18 pm-8:04 am

1 stop12h 46m

$154

OntarioChicago

ONT - ORD

ONTORD

Ontario

Wed 5/13

7:29 pm-5:31 am

1 stop8h 02m

Chicago O'Hare Intl

Sun 5/17

9:18 pm-8:04 am

1 stop12h 46m

$175

OntarioChicago

ONT - ORD

ONTORD

Ontario

Mon 3/23

3:30 pm-6:08 am

1 stop12h 38m

Chicago O'Hare Intl

Wed 3/25

12:35 pm-9:03 pm

1 stop10h 28m

$181

OntarioChicago

ONT - ORD

ONTORD

Ontario

Thu 5/14

12:59 am-9:50 am

1 stop6h 51m

Chicago O'Hare Intl

Tue 5/19

9:18 pm-6:34 pm

1 stop23h 16m

$182

OntarioChicago

ONT - ORD

ONTORD

Ontario

Sat 4/18

7:18 pm-6:47 am

1 stop9h 29m

Chicago O'Hare Intl

Sun 4/19

9:18 pm-8:04 am

1 stop12h 46m

$190

OntarioChicago

ONT - ORD

ONTORD

Ontario

Thu 5/14

12:59 am-9:50 am

1 stop6h 51m

Chicago O'Hare Intl

Sun 5/17

9:18 pm-8:04 am

1 stop12h 46m

$194

OntarioChicago

ONT - ORD

ONTORD

Ontario

Wed 4/29

12:59 am-9:50 am

1 stop6h 51m

Chicago O'Hare Intl

Mon 5/4

9:18 pm-1:40 pm

1 stop18h 22m

$195

OntarioChicago

ONT - ORD

ONTORD

Ontario

Thu 2/26

3:24 pm-5:26 pm

1 stop24h 02m

Chicago O'Hare Intl

Sun 3/1

8:39 am-2:29 pm

1 stop7h 50m

$196

OntarioChicago

ONT - ORD

ONTORD

Ontario

Tue 4/14

7:29 pm-6:47 am

1 stop9h 18m

Chicago O'Hare Intl

Sat 4/18

4:55 pm-10:42 pm

1 stop7h 47m

$200

OntarioChicago

ONT - ORD

ONTORD

Ontario

Sat 4/18

7:18 pm-6:47 am

1 stop9h 29m

Chicago O'Hare Intl

Mon 4/20

10:55 am-11:55 pm

1 stop15h 00m

$201

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

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 August is another great option to travel to Chicago O'Hare Intl Airport, with average flight prices from Ontario averaging around $317.

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 Thursday when prices can be found for as low as $353. 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 $429.

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 $269 when looking at flights departing in the afternoon. Try not to purchase tickets at noon because they tend to be around $450. 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 weeks ahead of your departure date. In general, you can expect to find flights to Chicago O'Hare Intl Airport for around $384 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 $288 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.

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

You could potentially save up to 5% 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 February 2026, prices for Ontario to Chicago O'Hare Intl Airport flights are approximately 360% more expensive 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

$148

Fastest flight time

4h 03m

Direct flights

Every day
The best one-way flight to Chicago O'Hare Intl Airport from Ontario in the past 72 hours is $148. The best round-trip flight deal from Ontario to Chicago O'Hare Intl Airport found on momondo in the last 72 hours is $395.
The fastest flight from Ontario to Chicago O'Hare Intl Airport takes 4h 03m
Direct flights go from Ontario to Chicago O'Hare Intl Airport every day.
Search flight deals

  • 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
FrontierPriceFrom $102Free CancellationRating
5.7
3,052 reviews
Search Frontier flights
United AirlinesPriceFrom $226Free CancellationRating
7.4
9,262 reviews
Search United Airlines flights
SouthwestPriceFrom $246Free CancellationRating
8.0
4,280 reviews
Search Southwest flights
American AirlinesPriceFrom $246Free CancellationRating
7.2
11,258 reviews
Search American Airlines flights
DeltaPriceFrom $256Free CancellationRating
7.9
8,176 reviews
Search Delta flights

Traveling to a place near Chicago?

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

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.

An easier way to manage your Chicago O'Hare Intl Airport trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Wed 3/11
Wed 3/18
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to Chicago