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Cheap flights from Ontario to Chicago from $79

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 10/6. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Find the cheapest flights from Ontario to Chicago

Cheap round-trip flights

Frontier Logo
11:59 am - 8:44 pmONT-MDW
6h 45m1 stop
Frontier Logo
6:30 am - 6:49 pmMDW-ONT
14h 19m1 stop
$173Frontier
Find Deal
Thu, Nov 13 - Sun, Nov 16
Frontier Logo
12:13 pm - 8:52 pmONT-MDW
6h 39m1 stop
Frontier Logo
6:30 am - 6:35 pmMDW-ONT
14h 05m1 stop
$174Frontier
Find Deal
Mon, Sep 29 - Thu, Oct 2
Frontier Logo
12:32 pm - 3:12 pmONT-MDW
24h 40m1 stop
Frontier Logo
9:43 pm - 7:29 amMDW-ONT
11h 46m1 stop
$178Frontier
Find Deal
Thu, Oct 23 - Thu, Oct 30
Frontier Logo
1:46 pm - 12:37 pmONT-MDW
20h 51m1 stop
Frontier Logo
6:30 am - 6:39 pmMDW-ONT
14h 09m1 stop
$179Frontier
Find Deal
Fri, Nov 7 - Mon, Nov 10
Frontier Logo
12:13 pm - 8:52 pmONT-MDW
6h 39m1 stop
Frontier Logo
10:18 am - 3:24 pmMDW-ONT
7h 06m1 stop
$185Frontier
Find Deal
Fri, Oct 3 - Sun, Oct 5
Frontier Logo
12:13 pm - 8:52 pmONT-MDW
6h 39m1 stop
Frontier Logo
10:18 am - 6:15 pmMDW-ONT
9h 57m1 stop
$186Frontier
Find Deal
Fri, Oct 3 - Sun, Oct 5
Frontier Logo
6:53 am - 12:24 amONT-MDW
15h 31m1 stop
Frontier Logo
10:30 am - 5:54 pmMDW-ONT
9h 24m1 stop
$187Frontier
Find Deal
Mon, Oct 20 - Thu, Oct 23
Frontier Logo
12:13 pm - 8:52 pmONT-MDW
6h 39m1 stop
Frontier Logo
10:30 am - 5:49 pmMDW-ONT
9h 19m1 stop
$188Frontier
Find Deal
Fri, Oct 3 - Sun, Oct 12
Frontier Logo
8:34 am - 11:20 pmONT-MDW
12h 46m1 stop
Frontier Logo
9:00 am - 4:28 pmMDW-ONT
9h 28m1 stop
$195Frontier
Find Deal
Sat, Oct 11 - Mon, Oct 13
Multiple Airlines Logo
8:00 am - 11:20 pmONT-MDW
13h 20m2 stops
Multiple Airlines Logo
9:00 am - 4:28 pmMDW-ONT
9h 28m1 stop
$258Multiple Airlines
Find Deal
Tue, Oct 21 - Fri, Oct 24

Frontier flights from Ontario to Chicago Midway Airport

Our best Frontier deals on Ontario to Chicago Midway Airport flight tickets
Frontier
Nov 13
ONT11:59 amOntario
6h 45m
1 stop
MDW8:44 pmChicago Midway
Nov 16
MDW6:30 amChicago Midway
14h 19m
1 stop
ONT6:49 pmOntario
$173
Find similar
Frontier
Sep 29
ONT12:13 pmOntario
6h 39m
1 stop
MDW8:52 pmChicago Midway
Oct 2
MDW6:30 amChicago Midway
14h 05m
1 stop
ONT6:35 pmOntario
$174
Find similar
Frontier
Oct 23
ONT12:32 pmOntario
24h 40m
1 stop
MDW3:12 pmChicago Midway
Oct 30
MDW9:43 pmChicago Midway
11h 46m
1 stop
ONT7:29 amOntario
$178
Find similar

Delta flights from Ontario to Chicago Midway Airport

Our best Delta deals on Ontario to Chicago Midway Airport flight tickets
Delta
Oct 1
ONT11:55 amOntario
7h 41m
1 stop
MDW9:36 pmChicago Midway
Oct 6
MDW5:04 pmChicago Midway
7h 18m
1 stop
ONT10:22 pmOntario
$599
Find similar
Delta
Sep 29
ONT10:00 pmOntario
9h 40m
1 stop
MDW9:40 amChicago Midway
Oct 3
MDW1:08 pmChicago Midway
12h 34m
2 stops
ONT11:42 pmOntario
$604
Find similar
Delta
Sep 29
ONT10:00 pmOntario
12h 28m
2 stops
MDW12:28 pmChicago Midway
Oct 3
MDW1:08 pmChicago Midway
12h 34m
2 stops
ONT11:42 pmOntario
$609
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Ontario to Chicago Midway 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 September 17, 2025.
Use the filters below to find and compare flights from Ontario to Chicago Midway Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

OntarioChicago

ONT - MDW

ONTMDW

Ontario

Thu 11/13

11:59 am-8:44 pm

1 stop6h 45m

Chicago Midway

Sun 11/16

6:30 am-6:49 pm

1 stop14h 19m

$173

OntarioChicago

ONT - MDW

ONTMDW

Ontario

Mon 9/29

12:13 pm-8:52 pm

1 stop6h 39m

Chicago Midway

Thu 10/2

6:30 am-6:35 pm

1 stop14h 05m

$174

OntarioChicago

ONT - MDW

ONTMDW

Ontario

Thu 10/23

12:32 pm-3:12 pm

1 stop24h 40m

Chicago Midway

Thu 10/30

9:43 pm-7:29 am

1 stop11h 46m

$178

OntarioChicago

ONT - MDW

ONTMDW

Ontario

Fri 11/7

1:46 pm-12:37 pm

1 stop20h 51m

Chicago Midway

Mon 11/10

6:30 am-6:39 pm

1 stop14h 09m

$179

OntarioChicago

ONT - MDW

ONTMDW

Ontario

Fri 10/3

12:13 pm-8:52 pm

1 stop6h 39m

Chicago Midway

Sun 10/5

10:18 am-3:24 pm

1 stop7h 06m

$185

OntarioChicago

ONT - MDW

ONTMDW

Ontario

Fri 10/3

12:13 pm-8:52 pm

1 stop6h 39m

Chicago Midway

Sun 10/5

10:18 am-6:15 pm

1 stop9h 57m

$186

OntarioChicago

ONT - MDW

ONTMDW

Ontario

Mon 10/20

6:53 am-12:24 am

1 stop15h 31m

Chicago Midway

Thu 10/23

10:30 am-5:54 pm

1 stop9h 24m

$187

OntarioChicago

ONT - MDW

ONTMDW

Ontario

Fri 10/3

12:13 pm-8:52 pm

1 stop6h 39m

Chicago Midway

Sun 10/12

10:30 am-5:49 pm

1 stop9h 19m

$188

OntarioChicago

ONT - MDW

ONTMDW

Ontario

Sat 10/11

8:34 am-11:20 pm

1 stop12h 46m

Chicago Midway

Mon 10/13

9:00 am-4:28 pm

1 stop9h 28m

$195

OntarioChicago

ONT - MDW

ONTMDW

Ontario

Tue 10/21

8:00 am-11:20 pm

2 stops13h 20m

Chicago Midway

Fri 10/24

9:00 am-4:28 pm

1 stop9h 28m

$258

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 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 $215. If you are unable to visit Chicago Midway Airport during the month of October, then departing from Ontario during the month April is also very affordable. Most momondo users find prices during this month for around $274.

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

According to our data, Saturday is the cheapest day to fly to Chicago Midway Airport from Ontario. The lowest ticket price found for a Saturday departure recently was $361. 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 $498.

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 $327 when looking at flights departing in the afternoon. Try not to purchase tickets at noon because they tend to be around $497. 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 $354 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 $198 on momondo.

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

There is only 1 cabin class 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 September 2025, prices for Ontario to Chicago Midway Airport flights are approximately 58% more expensive 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

$198

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 $198. The best round-trip flight deal from Ontario to Chicago Midway Airport found on momondo in the last 72 hours is $343.
The fastest flight from Ontario to Chicago Midway Airport takes 3h 45m
Direct flights go from Ontario to Chicago Midway Airport every day.
Search flight deals

  • 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 39m 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 $122Free CancellationRating
5.8
3,173 reviews
Search Frontier flights
SouthwestPriceFrom $237Free CancellationRating
8.0
4,242 reviews
Search Southwest flights
DeltaPriceFrom $256Free CancellationRating
7.9
7,961 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 $406, with the best Southwest deals starting from $237 round-trip. 4,242 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
Saint Joseph
Lansing
Portage
Schererville
Valparaiso
Crown Point
Munster
Chesterton
Monticello
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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