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Cheap flights from Ontario to Chicago from $96

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 6/2. 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

KAYAK's recommended round-trip deals from the most popular airlines that fly from Ontario to Chicago.
Frontier Logo
12:59 am - 11:52 pmONT-ORD
20h 53m1 stop
Frontier Logo
6:00 am - 9:15 amORD-ONT
29h 15m1 stop
$181Frontier
Find Deal
Fri, May 23 - Wed, May 28
Frontier Logo
1:08 pm - 6:50 pmONT-ORD
27h 42m1 stop
Frontier Logo
6:00 am - 9:15 amORD-ONT
29h 15m1 stop
$189Frontier
Find Deal
Tue, May 20 - Wed, May 28
Southwest Logo
5:10 am - 11:00 amONT-MDW
3h 50mnonstop
Southwest Logo
8:00 pm - 10:15 pmMDW-ONT
4h 15mnonstop
$227Southwest
Find Deal
Fri, May 30 - Tue, Jun 3
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
Wed, Jun 4 - Wed, Jun 4
United Airlines Logo
7:00 am - 1:03 pmONT-ORD
4h 03mnonstop
United Airlines Logo
12:53 pm - 8:33 pmORD-ONT
9h 40m1 stop
$233United Airlines
Find Deal
Wed, Sep 3 - Fri, Sep 5
Southwest Logo
5:10 am - 11:00 amONT-MDW
3h 50mnonstop
Southwest Logo
5:35 am - 10:35 amMDW-ONT
7h 00m1 stop
$237Southwest
Find Deal
Fri, May 30 - Tue, Jun 3
American Airlines Logo
6:10 am - 2:50 pmONT-ORD
6h 40m1 stop
American Airlines Logo
5:00 am - 8:38 amORD-ONT
5h 38m1 stop
$248American Airlines
Find Deal
Sat, Jul 26 - Sat, Aug 9
American Airlines Logo
4:45 pm - 12:37 amONT-ORD
5h 52m1 stop
American Airlines Logo
5:00 am - 8:38 amORD-ONT
5h 38m1 stop
$249American Airlines
Find Deal
Sat, Jul 26 - Sat, Aug 9
Delta Logo
10:59 pm - 9:51 amONT-MDW
8h 52m1 stop
Delta Logo
3:40 pm - 10:29 pmMDW-ONT
8h 49m1 stop
$257Delta
Find Deal
Fri, Aug 22 - Tue, Aug 26
Delta Logo
10:00 pm - 8:35 amONT-ORD
8h 35m1 stop
Delta Logo
4:30 pm - 10:16 pmORD-ONT
7h 46m1 stop
$257Delta
Find Deal
Fri, Jun 6 - Sat, Jun 7

Frontier flights from Ontario to Chicago

Our best Frontier deals on Ontario to Chicago flight tickets
Frontier
May 23
ONT12:59 amOntario
20h 53m
1 stop
ORD11:52 pmChicago O'Hare Intl
May 28
ORD6:00 amChicago O'Hare Intl
29h 15m
1 stop
ONT9:15 amOntario
Frontier
May 20
ONT1:08 pmOntario
27h 42m
1 stop
ORD6:50 pmChicago O'Hare Intl
May 28
ORD6:00 amChicago O'Hare Intl
29h 15m
1 stop
ONT9:15 amOntario
Frontier
Jun 2
ONT12:59 amOntario
17h 54m
1 stop
MDW8:53 pmChicago Midway
Jun 6
MDW6:25 amChicago Midway
16h 26m
1 stop
ONT8:51 pmOntario

United Airlines flights from Ontario to Chicago

Our best United Airlines deals on Ontario to Chicago flight tickets
United Airlines
Jun 4
ONT7:00 amOntario
4h 03m
ORD1:03 pmChicago O'Hare Intl
Jun 4
ORD7:55 pmChicago O'Hare Intl
4h 31m
ONT10:26 pmOntario
United Airlines
Sep 3
ONT7:00 amOntario
4h 03m
ORD1:03 pmChicago O'Hare Intl
Sep 5
ORD12:53 pmChicago O'Hare Intl
9h 40m
1 stop
ONT8:33 pmOntario
United Airlines
Sep 3
ONT5:10 amOntario
6h 05m
1 stop
ORD1:15 pmChicago O'Hare Intl
Sep 5
ORD12:53 pmChicago O'Hare Intl
9h 40m
1 stop
ONT8:33 pmOntario

See travel insights to Chicago from

How to get the cheapest flight ticket from Ontario to Chicago

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?

What is the cheapest month to fly to Chicago?

The month of November is, on average, the cheapest month to fly to Chicago from Ontario, with most prices found around $200. If you’re not able to fly to Chicago in November, then September is your next best option. Flight prices from Ontario to Chicago during September average around $258.

What is the cheapest day to depart on your flight to Chicago?

The cheapest day to depart on your flight to Chicago 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. When flying out on a Sunday, the most expensive travel day of the week, you can expect to see flight prices from Ontario to Chicago for around $481.

What is the cheapest time of day to depart on your flight to Chicago?

Our most recent data shows that the best time of day to fly to Chicago is in the afternoon. Flights from Ontario to Chicago during this time can be as low as $308. In contrast, the most expensive time of day to depart to Chicago is at noon when prices are around $464.

What is the cheapest Ontario to Chicago flight route?

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

How far in advance should I book a flight to Chicago?

You are more likely to see cheaper flights to Chicago from Ontario when booking 4 weeks ahead of your departure date. In general, you can expect to find flights to Chicago for around $353 when searching 4 weeks out.However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Chicago from Ontario for as low as $260 on momondo.

What cabin class options are available on Ontario to Chicago flights?

There are 4 cabin classes available to choose from on Ontario to Chicago 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 flight prices changed over time?

As of April 2025, prices for Ontario to Chicago flights are approximately 39% cheaper when compared to flights at the same time last year.

When to book flights from Ontario to Chicago

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

Cheap Ontario to Chicago (ONT to CHI) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Ontario to Chicago

Best Price Found

$96

Fastest flight time

3h 45m

Direct flights

Every day

Airports in Chicago

2 airports
The best one-way flight to Chicago from Ontario in the past 72 hours is $96. The best round-trip flight deal from Ontario to Chicago found on momondo in the last 72 hours is $181.
The fastest flight from Ontario to Chicago takes 3h 45m
Direct flights go from Ontario to Chicago every day.
There are 2 airports near Chicago: Chicago O'Hare Intl (ORD), Chicago Midway (MDW)

  • How far is Ontario to Chicago by plane?

    The straight-line distance from Ontario to Chicago is 1710.7 mi. 3h 45m is a normal flight duration for this route.

  • When did momondo last update prices for flights from Ontario Airport to Chicago?

    Prices for flights from Ontario Airport to Chicago were last updated today.

  • How many operators does momondo search for flights from Ontario Airport to Chicago?

  • How old do you have to be to fly from Ontario Airport to Chicago?

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Ontario Airport to Chicago.

  • What documentation or ID do you need to fly to Chicago?

    The travel and health documents required for your trip to Chicago can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Chicago. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

  • What is the most popular plane model from Ontario to Chicago?

  • What is the most popular airline from Ontario to Chicago?


Best airlines flying from Ontario to Chicago

Compare and see reviews for airlines that fly from Ontario to Chicago with momondo
Airline
Rating
Free Cancellation
Price
Spirit AirlinesPriceFrom $74Free CancellationRating
6.3
7,940 reviews
Search Spirit Airlines flights
FrontierPriceFrom $108Free CancellationRating
5.9
3,283 reviews
Search Frontier flights
Alaska AirlinesPriceFrom $161Free CancellationRating
8.0
9,911 reviews
Search Alaska Airlines flights
United AirlinesPriceFrom $227Free CancellationRating
7.4
8,684 reviews
Search United Airlines flights
DeltaPriceFrom $241Free CancellationRating
8.0
7,920 reviews
Search Delta flights
American AirlinesPriceFrom $246Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
SouthwestPriceFrom $246Free CancellationRating
8.0
4,287 reviews
Search Southwest flights
  • Southwest Flights From Ontario to Chicago

    Southwest flight deals from Ontario to Chicago start from $246 round-trip. Over the 7 Southwest flights for this route in a normal week, average airfare is usually $453 round-trip - but some users have found much cheaper deals with momondo.


Traveling to a place near Chicago?

Book flights to Chicago if you plan to visit one of these locations
Merrillville
New Buffalo
Hammond
Benton Harbor
Portage
Lansing
Saint Joseph
Schererville
Valparaiso
Munster
Crown Point
Monticello
Chesterton
Griffith
Porter
Saint John

Why use momondo?

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

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Ontario to Chicago. momondo saves you time and could save you money on your trip.

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

Yes. All flights to Chicago from Ontario on momondo can be compared and filtered by various policies on offer, including flexible booking.

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

Once you have performed a search for Ontario to Chicago flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

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

Of course. momondo tracks the price of Ontario to Chicago flights. All you need is a valid email address and we will do the rest; it is that quick and easy.


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Find better results for your trip to the United States

Fly into one of these airports located in Chicago

Airports listed have a maximum distance of 78.5 mi from Chicago