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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 1/16. 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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0 bags

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Find the cheapest flights from Ontario to Chicago

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
3:20 pm - 11:08 amONT-MDW
17h 48m1 stop
Frontier Logo
2:01 pm - 4:33 pmMDW-ONT
28h 32m1 stop
$207Frontier
Find Deal
Sat, Dec 13 - Sun, Dec 14
Frontier Logo
6:45 am - 7:55 pmONT-MDW
11h 10m1 stop
Frontier Logo
10:50 pm - 5:15 pmMDW-ONT
20h 25m2 stops
$210Frontier
Find Deal
Tue, Dec 30 - Sun, Jan 4
Frontier Logo
10:18 pm - 2:05 pmONT-MDW
13h 47m2 stops
Frontier Logo
11:05 am - 7:01 pmMDW-ONT
9h 56m1 stop
$213Frontier
Find Deal
Thu, Jan 8 - Thu, Jan 15
Frontier Logo
12:04 pm - 11:08 amONT-MDW
21h 04m1 stop
Frontier Logo
12:35 pm - 5:32 pmMDW-ONT
6h 57m1 stop
$216Frontier
Find Deal
Thu, Dec 11 - Mon, Dec 15
Frontier Logo
8:02 am - 5:20 pmONT-MDW
7h 18m1 stop
Frontier Logo
11:05 am - 7:01 pmMDW-ONT
9h 56m1 stop
$217Frontier
Find Deal
Thu, Jan 15 - Sun, Jan 18
Frontier Logo
6:17 pm - 10:12 pmONT-MDW
25h 55m2 stops
Frontier Logo
10:50 pm - 11:59 pmMDW-ONT
27h 09m1 stop
$220Frontier
Find Deal
Tue, Dec 30 - Sun, Jan 4
Frontier Logo
12:04 pm - 11:08 amONT-MDW
21h 04m1 stop
Frontier Logo
12:35 pm - 5:32 pmMDW-ONT
6h 57m1 stop
$221Frontier
Find Deal
Thu, Dec 11 - Mon, Dec 15
Frontier Logo
8:02 am - 5:20 pmONT-MDW
7h 18m1 stop
Frontier Logo
9:09 pm - 3:07 pmMDW-ONT
19h 58m1 stop
$222Frontier
Find Deal
Thu, Jan 15 - Mon, Jan 19
Frontier Logo
6:45 am - 7:55 pmONT-MDW
11h 10m1 stop
Frontier Logo
8:00 am - 3:46 pmMDW-ONT
9h 46m1 stop
$227Frontier
Find Deal
Tue, Dec 23 - Tue, Dec 30
Frontier Logo
3:20 pm - 11:08 amONT-MDW
17h 48m1 stop
Frontier Logo
2:01 pm - 4:33 pmMDW-ONT
28h 32m1 stop
$228Frontier
Find Deal
Sat, Dec 6 - Sun, Dec 14

Frontier flights from Ontario to Chicago Midway Airport

Our best Frontier deals on Ontario to Chicago Midway Airport flight tickets
Frontier
Dec 30
ONT6:45 amOntario
11h 10m
1 stop
MDW7:55 pmChicago Midway
Jan 4
MDW10:50 pmChicago Midway
20h 25m
2 stops
ONT5:15 pmOntario
$210
Find similar
Frontier
Jan 8
ONT10:18 pmOntario
13h 47m
2 stops
MDW2:05 pmChicago Midway
Jan 15
MDW11:05 amChicago Midway
9h 56m
1 stop
ONT7:01 pmOntario
$213
Find similar
Frontier
Dec 11
ONT12:04 pmOntario
21h 04m
1 stop
MDW11:08 amChicago Midway
Dec 15
MDW12:35 pmChicago Midway
6h 57m
1 stop
ONT5:32 pmOntario
$216
Find similar

Delta flights from Ontario to Chicago Midway Airport

Our best Delta deals on Ontario to Chicago Midway Airport flight tickets
Delta
Feb 23
ONT10:20 pmOntario
9h 36m
1 stop
MDW9:56 amChicago Midway
Feb 28
MDW1:28 pmChicago Midway
11h 09m
2 stops
ONT10:37 pmOntario
$345
Find similar
Delta
Jan 8
ONT10:30 pmOntario
12h 18m
2 stops
MDW12:48 pmChicago Midway
Jan 14
MDW1:49 pmChicago Midway
10h 49m
2 stops
ONT10:38 pmOntario
$350
Find similar
Delta
Jan 8
ONT10:30 pmOntario
12h 18m
2 stops
MDW12:48 pmChicago Midway
Jan 11
MDW1:49 pmChicago Midway
10h 49m
2 stops
ONT10:38 pmOntario
$371
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 November 25, 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

Sat 12/13

3:20 pm-11:08 am

1 stop17h 48m

Chicago Midway

Sun 12/14

2:01 pm-4:33 pm

1 stop28h 32m

$207

OntarioChicago

ONT - MDW

ONTMDW

Ontario

Tue 12/30

6:45 am-7:55 pm

1 stop11h 10m

Chicago Midway

Sun 1/4

10:50 pm-5:15 pm

2 stops20h 25m

$210

OntarioChicago

ONT - MDW

ONTMDW

Ontario

Thu 1/8

10:18 pm-2:05 pm

2 stops13h 47m

Chicago Midway

Thu 1/15

11:05 am-7:01 pm

1 stop9h 56m

$213

OntarioChicago

ONT - MDW

ONTMDW

Ontario

Thu 12/11

12:04 pm-11:08 am

1 stop21h 04m

Chicago Midway

Mon 12/15

12:35 pm-5:32 pm

1 stop6h 57m

$216

OntarioChicago

ONT - MDW

ONTMDW

Ontario

Thu 1/15

8:02 am-5:20 pm

1 stop7h 18m

Chicago Midway

Sun 1/18

11:05 am-7:01 pm

1 stop9h 56m

$217

OntarioChicago

ONT - MDW

ONTMDW

Ontario

Tue 12/30

6:17 pm-10:12 pm

2 stops25h 55m

Chicago Midway

Sun 1/4

10:50 pm-11:59 pm

1 stop27h 09m

$220

OntarioChicago

ONT - MDW

ONTMDW

Ontario

Thu 12/11

12:04 pm-11:08 am

1 stop21h 04m

Chicago Midway

Mon 12/15

12:35 pm-5:32 pm

1 stop6h 57m

$221

OntarioChicago

ONT - MDW

ONTMDW

Ontario

Thu 1/15

8:02 am-5:20 pm

1 stop7h 18m

Chicago Midway

Mon 1/19

9:09 pm-3:07 pm

1 stop19h 58m

$222

OntarioChicago

ONT - MDW

ONTMDW

Ontario

Tue 12/23

6:45 am-7:55 pm

1 stop11h 10m

Chicago Midway

Tue 12/30

8:00 am-3:46 pm

1 stop9h 46m

$227

OntarioChicago

ONT - MDW

ONTMDW

Ontario

Sat 12/6

3:20 pm-11:08 am

1 stop17h 48m

Chicago Midway

Sun 12/14

2:01 pm-4:33 pm

1 stop28h 32m

$228

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 December is, on average, the cheapest month to fly to Chicago Midway Airport from Ontario, with most prices found around $237. If you are unable to visit Chicago Midway Airport during the month of December, then departing from Ontario during the month September is also very affordable. Most momondo users find prices during this month for around $263.

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 $357. 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 $492.

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 $345 when looking at flights departing in the afternoon. Try not to purchase tickets at noon because they tend to be around $510. 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 $370 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 $265 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 November 2025, prices for Ontario to Chicago Midway Airport flights are approximately 47% 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

$167

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 $167. The best round-trip flight deal from Ontario to Chicago Midway Airport found on momondo in the last 72 hours is $376.
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 7h 18m 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 $110Free CancellationRating
5.8
3,097 reviews
Search Frontier flights
SouthwestPriceFrom $237Free CancellationRating
8.0
4,252 reviews
Search Southwest flights

  • Southwest Flights From Ontario to Chicago Midway Airport

    Across 8 Southwest flights from Ontario to Chicago Midway Airport this week, the average price was $404, with the best Southwest deals starting from $237 round-trip. 4,252 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
Portage
Lansing
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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