Latest deals
Insights
When to book
FAQs
Reviews
Price Alerts

Cheap flights from Ontario to Chicago from $78

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 10/31. 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.
Search flight deals

Find the cheapest flights from Ontario to Chicago

Cheap round-trip flights

Frontier Logo
12:13 pm - 8:52 pmONT-MDW
6h 39m1 stop
Frontier Logo
10:13 am - 3:29 pmMDW-ONT
7h 16m1 stop
$186Frontier
Find Deal
Fri, Sep 19 - Thu, Sep 25
Frontier Logo
8:34 am - 11:20 pmONT-MDW
12h 46m1 stop
Frontier Logo
6:24 pm - 9:35 amMDW-ONT
17h 11m1 stop
$188Frontier
Find Deal
Thu, Oct 23 - Sun, Oct 26
Frontier Logo
12:32 pm - 4:09 pmONT-MDW
25h 37m1 stop
Frontier Logo
9:00 am - 4:28 pmMDW-ONT
9h 28m1 stop
$190Frontier
Find Deal
Fri, Oct 10 - Mon, Oct 13
Frontier Logo
6:53 am - 12:36 amONT-MDW
15h 43m1 stop
Frontier Logo
10:30 am - 5:49 pmMDW-ONT
9h 19m1 stop
$191Frontier
Find Deal
Thu, Oct 16 - Sun, Oct 19
Frontier Logo
12:13 pm - 8:52 pmONT-MDW
6h 39m1 stop
Frontier Logo
6:30 am - 6:35 pmMDW-ONT
14h 05m1 stop
$195Frontier
Find Deal
Fri, Sep 19 - Sun, Sep 21
Frontier Logo
8:34 am - 11:20 pmONT-MDW
12h 46m1 stop
Frontier Logo
10:30 am - 5:49 pmMDW-ONT
9h 19m1 stop
$196Frontier
Find Deal
Sat, Oct 25 - Sun, Oct 26
Frontier Logo
6:53 am - 12:36 amONT-MDW
15h 43m1 stop
Frontier Logo
10:30 am - 5:49 pmMDW-ONT
9h 19m1 stop
$202Frontier
Find Deal
Thu, Oct 16 - Sun, Oct 19
Frontier Logo
8:59 pm - 3:53 pmONT-MDW
16h 54m1 stop
Frontier Logo
3:48 pm - 7:54 pmMDW-ONT
6h 06m1 stop
$205Frontier
Find Deal
Sun, Sep 14 - Fri, Sep 19
Logo
7:30 pm - 8:52 pmONT-MDW
23h 22m1 stop
Logo
6:30 am - 6:35 pmMDW-ONT
14h 05m1 stop
$230
Find Deal
Thu, Sep 25 - Sun, Sep 28
Logo
7:30 pm - 8:52 pmONT-MDW
23h 22m1 stop
Logo
6:21 am - 6:15 pmMDW-ONT
13h 54m2 stops
$253
Find Deal
Thu, Sep 25 - Sun, Sep 28

Frontier flights from Ontario to Chicago Midway Airport

Our best Frontier deals on Ontario to Chicago Midway Airport flight tickets
Frontier
Sep 19
ONT12:13 pmOntario
6h 39m
1 stop
MDW8:52 pmChicago Midway
Sep 25
MDW10:13 amChicago Midway
7h 16m
1 stop
ONT3:29 pmOntario
$186
Find similar
Frontier
Oct 23
ONT8:34 amOntario
12h 46m
1 stop
MDW11:20 pmChicago Midway
Oct 26
MDW6:24 pmChicago Midway
17h 11m
1 stop
ONT9:35 amOntario
$188
Find similar
Frontier
Oct 10
ONT12:32 pmOntario
25h 37m
1 stop
MDW4:09 pmChicago Midway
Oct 13
MDW9:00 amChicago Midway
9h 28m
1 stop
ONT4:28 pmOntario
$190
Find similar

Southwest flights from Ontario to Chicago Midway Airport

Our best Southwest deals on Ontario to Chicago Midway Airport flight tickets
Southwest
Sep 11
ONT7:00 amOntario
7h 20m
1 stop
MDW4:20 pmChicago Midway
Sep 17
MDW2:15 pmChicago Midway
8h 00m
1 stop
ONT8:15 pmOntario
$535
Find similar
Southwest
Sep 11
ONT5:50 amOntario
8h 20m
2 stops
MDW4:10 pmChicago Midway
Sep 17
MDW4:05 pmChicago Midway
6h 55m
2 stops
ONT9:00 pmOntario
$545
Find similar
Southwest
Sep 11
ONT8:30 pmOntario
6h 40m
1 stop
MDW5:10 amChicago Midway
Sep 15
MDW8:20 pmChicago Midway
4h 10m
ONT10:30 pmOntario
$569
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 August 28, 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

Fri 9/19

12:13 pm-8:52 pm

1 stop6h 39m

Chicago Midway

Thu 9/25

10:13 am-3:29 pm

1 stop7h 16m

$186

OntarioChicago

ONT - MDW

ONTMDW

Ontario

Thu 10/23

8:34 am-11:20 pm

1 stop12h 46m

Chicago Midway

Sun 10/26

6:24 pm-9:35 am

1 stop17h 11m

$188

OntarioChicago

ONT - MDW

ONTMDW

Ontario

Fri 10/10

12:32 pm-4:09 pm

1 stop25h 37m

Chicago Midway

Mon 10/13

9:00 am-4:28 pm

1 stop9h 28m

$190

OntarioChicago

ONT - MDW

ONTMDW

Ontario

Thu 10/16

6:53 am-12:36 am

1 stop15h 43m

Chicago Midway

Sun 10/19

10:30 am-5:49 pm

1 stop9h 19m

$191

OntarioChicago

ONT - MDW

ONTMDW

Ontario

Fri 9/19

12:13 pm-8:52 pm

1 stop6h 39m

Chicago Midway

Sun 9/21

6:30 am-6:35 pm

1 stop14h 05m

$195

OntarioChicago

ONT - MDW

ONTMDW

Ontario

Sat 10/25

8:34 am-11:20 pm

1 stop12h 46m

Chicago Midway

Sun 10/26

10:30 am-5:49 pm

1 stop9h 19m

$196

OntarioChicago

ONT - MDW

ONTMDW

Ontario

Thu 10/16

6:53 am-12:36 am

1 stop15h 43m

Chicago Midway

Sun 10/19

10:30 am-5:49 pm

1 stop9h 19m

$202

OntarioChicago

ONT - MDW

ONTMDW

Ontario

Sun 9/14

8:59 pm-3:53 pm

1 stop16h 54m

Chicago Midway

Fri 9/19

3:48 pm-7:54 pm

1 stop6h 06m

$205

OntarioChicago

ONT - MDW

ONTMDW

Ontario

Thu 9/25

7:30 pm-8:52 pm

1 stop23h 22m

Chicago Midway

Sun 9/28

6:30 am-6:35 pm

1 stop14h 05m

$230

OntarioChicago

ONT - MDW

ONTMDW

Ontario

Thu 9/25

7:30 pm-8:52 pm

1 stop23h 22m

Chicago Midway

Sun 9/28

6:21 am-6:15 pm

2 stops13h 54m

$253

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

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 $162. 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 $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 $365. 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 $493.

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 $324 when looking at flights departing in the afternoon. Try not to purchase tickets at noon because they tend to be around $492. 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 $345 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 $196 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 August 2025, prices for Ontario to Chicago Midway Airport flights are approximately 78% 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

$245

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 $245. The best round-trip flight deal from Ontario to Chicago Midway Airport found on momondo in the last 72 hours is $337.
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 $110Free CancellationRating
5.8
3,204 reviews
Search Frontier flights
SouthwestPriceFrom $237Free CancellationRating
8.0
4,242 reviews
Search Southwest flights
DeltaPriceFrom $256Free CancellationRating
7.9
7,977 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 $403, 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.

An easier way to manage your Chicago Midway Airport 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.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Tue 9/2
Tue 9/9
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to Chicago