Latest deals
Insights
When to book
FAQs
Reviews
Price Alerts

Cheap flights from Ontario to Chicago from $104

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 4/17. 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.

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.
7:00 am - 1:03 pmONT-ORD
4h 03mnonstop
7:55 pm - 10:26 pmORD-ONT
4h 31mnonstop
$227United Airlines
Find Deal
Mon, May 26 - Fri, May 30
6:08 am - 5:10 pmONT-ORD
9h 02m1 stop
7:55 pm - 10:26 pmORD-ONT
4h 31mnonstop
$237United Airlines
Find Deal
Tue, May 20 - Sat, May 24
4:25 pm - 12:21 amONT-MDW
5h 56m1 stop
8:50 pm - 7:25 amMDW-ONT
12h 35m1 stop
$238Frontier
Find Deal
Fri, Apr 18 - Sun, Apr 20
12:11 pm - 11:37 pmONT-ORD
9h 26m1 stop
8:07 pm - 7:20 amORD-ONT
13h 13m1 stop
$238Frontier
Find Deal
Fri, Apr 25 - Sun, Apr 27
6:15 am - 3:00 pmONT-ORD
6h 45m1 stop
5:25 pm - 9:10 pmORD-ONT
5h 45m1 stop
$242Southwest
Find Deal
Sat, Jul 19 - Mon, Jul 21
12:00 pm - 10:15 pmONT-MDW
8h 15m1 stop
8:25 am - 2:10 pmMDW-ONT
7h 45m1 stop
$247Southwest
Find Deal
Tue, Apr 29 - Fri, May 9
5:15 pm - 12:53 amONT-ORD
5h 38m1 stop
7:30 am - 12:15 pmORD-ONT
6h 45m1 stop
$257Delta
Find Deal
Sat, May 3 - Wed, May 7
11:45 am - 12:53 amONT-ORD
11h 08m2 stops
7:30 am - 12:15 pmORD-ONT
6h 45m1 stop
$262Delta
Find Deal
Tue, May 6 - Sat, May 10
11:59 pm - 8:50 amONT-ORD
6h 51m1 stop
7:34 am - 12:00 pmORD-ONT
6h 26m1 stop
$283American Airlines
Find Deal
Thu, Jul 3 - Mon, Jul 7
2:40 pm - 12:59 amONT-ORD
8h 19m1 stop
5:00 am - 10:04 amORD-ONT
7h 04m1 stop
$312American Airlines
Find Deal
Thu, Jun 5 - Sun, Jun 8

United Airlines flights from Ontario to Chicago

Our best United Airlines deals on Ontario to Chicago flight tickets
United Airlines
May 26
ONT7:00 amOntario
4h 03m
ORD1:03 pmChicago O'Hare Intl
May 30
ORD7:55 pmChicago O'Hare Intl
4h 31m
ONT10:26 pmOntario
United Airlines
May 20
ONT6:08 amOntario
9h 02m
1 stop
ORD5:10 pmChicago O'Hare Intl
May 24
ORD7:55 pmChicago O'Hare Intl
4h 31m
ONT10:26 pmOntario
United Airlines
Aug 3
ONT7:00 amOntario
4h 03m
ORD1:03 pmChicago O'Hare Intl
Aug 6
ORD7:40 pmChicago O'Hare Intl
4h 31m
ONT10:11 pmOntario

Southwest flights from Ontario to Chicago

Our best Southwest deals on Ontario to Chicago flight tickets
Southwest
Jul 19
ONT6:15 amOntario
6h 45m
1 stop
ORD3:00 pmChicago O'Hare Intl
Jul 21
ORD5:25 pmChicago O'Hare Intl
5h 45m
1 stop
ONT9:10 pmOntario
Southwest
May 6
ONT7:00 amOntario
6h 00m
1 stop
ORD3:00 pmChicago O'Hare Intl
May 13
ORD6:55 pmChicago O'Hare Intl
6h 05m
1 stop
ONT11:00 pmOntario
Southwest
Aug 25
ONT12:55 pmOntario
8h 45m
2 stops
ORD11:40 pmChicago O'Hare Intl
Sep 9
ORD1:30 pmChicago O'Hare Intl
7h 20m
1 stop
ONT6:50 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 $247.

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 $375. 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 $484.

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 $311. In contrast, the most expensive time of day to depart to Chicago is at noon when prices are around $466.

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 $355 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 $257 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 March 2025, prices for Ontario to Chicago flights are approximately 2% 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

$104

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 $104. The best round-trip flight deal from Ontario to Chicago found on momondo in the last 72 hours is $227.
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
7,881 reviews
Search Spirit Airlines flights
FrontierPriceFrom $108Free CancellationRating
6.0
3,271 reviews
Search Frontier flights
Alaska AirlinesPriceFrom $161Free CancellationRating
8.0
9,798 reviews
Search Alaska Airlines flights
DeltaPriceFrom $241Free CancellationRating
8.0
7,895 reviews
Search Delta flights
United AirlinesPriceFrom $246Free CancellationRating
7.4
8,603 reviews
Search United Airlines flights
American AirlinesPriceFrom $246Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
SouthwestPriceFrom $262Free CancellationRating
8.0
4,273 reviews
Search Southwest flights
  • Southwest Flights From Ontario to Chicago

    Southwest flight deals from Ontario to Chicago start from $262 round-trip. Over the 5 Southwest flights for this route in a normal week, average airfare is usually $470 round-trip - but some users have found much cheaper deals with momondo.

  • United Airlines Flights From Ontario to Chicago

    The best United Airlines deal for Ontario to Chicago flight tickets found on momondo in the last 72 hours was $246, round-trip. It should be noted that an average United Airlines flight deal for this route in this time was higher, at $392 round-trip. United Airlines operates 1 flight out of Ontario into Chicago in an average week, so prices vary by time and availability. 8,603 United Airlines reviews by users on momondo have scored the airline at 7.4/10.


Traveling to a place near Chicago?

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


An easier way to manage your Chicago 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.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
From?
To?
Tue 4/1
Tue 4/8

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