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Cheap flights from Ontario to Chicago from $61

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 9/8. 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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Cheap round-trip flights

Frontier Logo
12:19 pm - 8:56 pmONT-MDW
6h 37m1 stop
Frontier Logo
6:00 am - 10:57 amMDW-ONT
6h 57m1 stop
$154Frontier
Find Deal
Mon, Oct 6 - Fri, Oct 10
Frontier Logo
12:59 am - 11:41 amONT-MDW
8h 42m1 stop
Frontier Logo
2:44 pm - 11:50 pmMDW-ONT
11h 06m1 stop
$164Frontier
Find Deal
Sun, Jul 20 - Thu, Jul 24
Frontier Logo
12:59 am - 11:41 amONT-MDW
8h 42m1 stop
Frontier Logo
6:31 pm - 11:50 pmMDW-ONT
7h 19m1 stop
$171Frontier
Find Deal
Sun, Aug 17 - Fri, Aug 22
Frontier Logo
12:40 pm - 11:34 pmONT-MDW
8h 54m1 stop
Frontier Logo
6:00 am - 2:47 pmMDW-ONT
10h 47m1 stop
$177Frontier
Find Deal
Thu, Oct 9 - Sun, Oct 12
Frontier Logo
12:48 pm - 10:23 pmONT-MDW
7h 35m1 stop
Frontier Logo
6:31 pm - 11:50 pmMDW-ONT
7h 19m1 stop
$179Frontier
Find Deal
Mon, Aug 18 - Fri, Aug 22
Frontier Logo
12:59 am - 11:41 amONT-MDW
8h 42m1 stop
Frontier Logo
6:31 pm - 11:50 pmMDW-ONT
7h 19m1 stop
$195Frontier
Find Deal
Thu, Jul 10 - Mon, Aug 25
Frontier Logo
5:21 pm - 8:54 pmONT-MDW
25h 33m1 stop
Frontier Logo
12:35 pm - 9:09 amMDW-ONT
22h 34m1 stop
$196Frontier
Find Deal
Wed, Jul 23 - Mon, Jul 28
Frontier Logo
5:21 pm - 8:54 pmONT-MDW
25h 33m1 stop
Frontier Logo
6:02 pm - 7:14 pmMDW-ONT
27h 12m1 stop
$197Frontier
Find Deal
Wed, Jul 30 - Wed, Aug 6
Frontier Logo
5:21 pm - 11:41 amONT-MDW
16h 20m1 stop
Frontier Logo
12:35 pm - 11:50 pmMDW-ONT
13h 15m1 stop
$198Frontier
Find Deal
Thu, Jul 24 - Mon, Jul 28
Frontier Logo
12:40 pm - 11:34 pmONT-MDW
8h 54m1 stop
Frontier Logo
6:00 am - 10:57 amMDW-ONT
6h 57m1 stop
$199Frontier
Find Deal
Fri, Oct 17 - Mon, Oct 20

Frontier flights from Ontario to Chicago Midway Airport

Our best Frontier deals on Ontario to Chicago Midway Airport flight tickets
Frontier
Oct 6
ONT12:19 pmOntario
6h 37m
1 stop
MDW8:56 pmChicago Midway
Oct 10
MDW6:00 amChicago Midway
6h 57m
1 stop
ONT10:57 amOntario
Frontier
Jul 20
ONT12:59 amOntario
8h 42m
1 stop
MDW11:41 amChicago Midway
Jul 24
MDW2:44 pmChicago Midway
11h 06m
1 stop
ONT11:50 pmOntario
Frontier
Aug 17
ONT12:59 amOntario
8h 42m
1 stop
MDW11:41 amChicago Midway
Aug 22
MDW6:31 pmChicago Midway
7h 19m
1 stop
ONT11:50 pmOntario

See travel insights to Chicago from

How to get the cheapest flight ticket from Ontario to Chicago Midway 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 Midway Airport?

The month of October is, on average, the cheapest month to fly to Chicago Midway Airport from Ontario, with most prices found around $166. If you are unable to visit Chicago Midway Airport during the month of October, then departing from Ontario during the month September is also very affordable. Most momondo users find prices during this month for around $220.

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

According to our data, Tuesday is the cheapest day to fly to Chicago Midway Airport from Ontario. The lowest ticket price found for a Tuesday departure recently was $378. Keep in mind that prices can always vary depending on your route and whether or not you are flying domestic or international. 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 $507.

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

Flying to Chicago Midway Airport from Ontario in the afternoon is the least expensive time of day to depart. momondo users have found prices as low as $320 when looking at flights departing in the afternoon. Try not to purchase tickets at noon because they tend to be around $481. 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 Midway flight route?

Fly from Ontario to Chicago Midway for the best Ontario - Chicago Midway flight prices

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

You are more likely to see cheaper flights to Chicago Midway Airport from Ontario when booking weeks ahead of your departure date. In general, you can expect to find flights to Chicago Midway Airport for around $334 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Chicago Midway Airport from Ontario for as low as $193 on momondo.

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

There are 1 cabin classes available to choose from on Ontario to Chicago Midway 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 Midway Airport flight prices changed over time?

As of June 2025, prices for Ontario to Chicago Midway Airport flights are approximately 29% cheaper when compared to flights at the same time last year.

When to book flights from Ontario to Chicago Midway Airport

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

Cheap Ontario to Chicago Midway Airport (ONT to MDW) flight deals and tips

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

Best Price Found

$61

Fastest flight time

3h 45m

Direct flights

Every day
The best one-way flight to Chicago Midway Airport from Ontario in the past 72 hours is $61. The best round-trip flight deal from Ontario to Chicago Midway Airport found on momondo in the last 72 hours is $154.
The fastest flight from Ontario to Chicago Midway Airport takes 3h 45m
Direct flights go from Ontario to Chicago Midway Airport every day.

  • How far is Ontario to Chicago Midway by plane?

    A flight from Ontario to Chicago Midway will travel around 1703.8 mi. Typically, this will take 6h 37m by plane in normal conditions.

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

    Prices for flights from Ontario Airport to Chicago Midway Airport are updated daily.

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

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

    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 Midway Airport.

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

    The travel and health documents required for your trip to Chicago Midway Airport 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 Midway Airport. 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 Midway Airport?

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


Best airlines flying from Ontario to Chicago Midway Airport

Compare and see reviews for airlines that fly from Ontario to Chicago Midway Airport with momondo
Airline
Rating
Free Cancellation
Price
FrontierPriceFrom $128Free CancellationRating
5.9
3,293 reviews
Search Frontier flights
SouthwestPriceFrom $237Free CancellationRating
8.0
4,278 reviews
Search Southwest flights
DeltaPriceFrom $256Free CancellationRating
8.0
7,969 reviews
Search Delta flights
  • Southwest Flights From Ontario to Chicago Midway Airport

    Across 5 Southwest flights from Ontario to Chicago Midway Airport this week, the average price was $413, with the best Southwest deals starting from $237 round-trip. 4,278 users have rated Southwest on momondo, with an average score of 8.0/10.


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
Saint Joseph
Lansing
Schererville
Valparaiso
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 compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Ontario to Chicago. Millions of users trust and use momondo every year so you are in good hands.

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?

Yes. momondo can track prices for Ontario to Chicago flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.


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