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Cheap flights from Ontario to Chicago from $80

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 4/8. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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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
2:08 pm - 4:13 pm
ONT
-
MDW
24h 05m
2 stops
Frontier Logo
5:13 pm - 3:05 pm
MDW
-
ONT
23h 52m
1 stop
$250Frontier
jue., mar. 5 - lun., mar. 9
Frontier Logo
7:17 pm - 11:27 am
ONT
-
MDW
14h 10m
2 stops
Frontier Logo
9:15 am - 2:29 pm
MDW
-
ONT
31h 14m
1 stop
$278Frontier
mié., feb. 18 - sáb., feb. 21
Frontier Logo
2:06 pm - 7:07 pm
ONT
-
MDW
27h 01m
2 stops
Frontier Logo
7:45 am - 8:48 pm
MDW
-
ONT
15h 03m
1 stop
$290Frontier
mar., feb. 17 - vie., feb. 20
Delta Logo
10:25 pm - 9:56 am
ONT
-
MDW
9h 31m
1 stop
Delta Logo
12:47 pm - 9:00 pm
MDW
-
ONT
10h 13m
1 stop
$301Delta
mar., mar. 10 - mar., mar. 17
Frontier Logo
2:21 pm - 3:19 pm
ONT
-
MDW
22h 58m
1 stop
Frontier Logo
3:21 pm - 1:11 pm
MDW
-
ONT
23h 50m
2 stops
$306Frontier
vie., feb. 13 - dom., feb. 15
Frontier Logo
8:40 am - 4:16 pm
ONT
-
MDW
29h 36m
2 stops
Frontier Logo
6:05 am - 8:55 pm
MDW
-
ONT
16h 50m
2 stops
$308Frontier
mié., mar. 4 - lun., mar. 9
Frontier Logo
6:20 am - 10:19 pm
ONT
-
MDW
13h 59m
2 stops
Frontier Logo
5:11 pm - 6:40 pm
MDW
-
ONT
27h 29m
1 stop
$309Frontier
vie., abr. 10 - dom., abr. 12
Delta Logo
1:15 pm - 10:31 pm
ONT
-
MDW
7h 16m
1 stop
Delta Logo
1:29 pm - 9:05 pm
MDW
-
ONT
9h 36m
2 stops
$312Delta
sáb., feb. 28 - sáb., mar. 7
Frontier Logo
7:17 pm - 4:16 pm
ONT
-
MDW
18h 59m
2 stops
Frontier Logo
6:45 pm - 4:15 pm
MDW
-
ONT
23h 30m
1 stop
$327Frontier
mié., mar. 4 - dom., mar. 8
Frontier Logo
8:40 am - 4:16 pm
ONT
-
MDW
29h 36m
2 stops
Frontier Logo
2:41 pm - 8:55 pm
MDW
-
ONT
32h 14m
2 stops
$334Frontier
mié., mar. 4 - dom., mar. 8

Frontier flights from Ontario to Chicago Midway Airport

Our best Frontier deals on Ontario to Chicago Midway Airport flight tickets
Frontier
Mar 5
ONT2:08 pmOntario
24h 05m
2 stops
MDW4:13 pmChicago Midway
Mar 9
MDW5:13 pmChicago Midway
23h 52m
1 stop
ONT3:05 pmOntario
$250
Frontier
Feb 18
ONT7:17 pmOntario
14h 10m
2 stops
MDW11:27 amChicago Midway
Feb 21
MDW9:15 amChicago Midway
31h 14m
1 stop
ONT2:29 pmOntario
$278
Frontier
Feb 28
ONT6:00 amOntario
13h 39m
2 stops
MDW9:39 pmChicago Midway
Mar 7
MDW9:16 pmChicago Midway
21h 58m
1 stop
ONT5:14 pmOntario
$282

Delta flights from Ontario to Chicago Midway Airport

Our best Delta deals on Ontario to Chicago Midway Airport flight tickets
Delta
Mar 10
ONT10:25 pmOntario
9h 31m
1 stop
MDW9:56 amChicago Midway
Mar 17
MDW12:47 pmChicago Midway
10h 13m
1 stop
ONT9:00 pmOntario
$301
Delta
Feb 28
ONT1:15 pmOntario
7h 16m
1 stop
MDW10:31 pmChicago Midway
Mar 7
MDW1:29 pmChicago Midway
9h 36m
2 stops
ONT9:05 pmOntario
$312
Delta
Feb 20
ONT10:20 pmOntario
10h 01m
1 stop
MDW10:21 amChicago Midway
Feb 24
MDW6:00 amChicago Midway
8h 02m
1 stop
ONT12:02 pmOntario
$350

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 enero 27, 2026.
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

jue. 3/5

2:08 pm-4:13 pm

2 stops24h 05m

Chicago Midway

lun. 3/9

5:13 pm-3:05 pm

1 stop23h 52m

$250

OntarioChicago

ONT - MDW

ONTMDW

Ontario

mié. 2/18

7:17 pm-11:27 am

2 stops14h 10m

Chicago Midway

sáb. 2/21

9:15 am-2:29 pm

1 stop31h 14m

$278

OntarioChicago

ONT - MDW

ONTMDW

Ontario

mar. 2/17

2:06 pm-7:07 pm

2 stops27h 01m

Chicago Midway

vie. 2/20

7:45 am-8:48 pm

1 stop15h 03m

$290

OntarioChicago

ONT - MDW

ONTMDW

Ontario

mar. 3/10

10:25 pm-9:56 am

1 stop9h 31m

Chicago Midway

mar. 3/17

12:47 pm-9:00 pm

1 stop10h 13m

$301

OntarioChicago

ONT - MDW

ONTMDW

Ontario

vie. 2/13

2:21 pm-3:19 pm

1 stop22h 58m

Chicago Midway

dom. 2/15

3:21 pm-1:11 pm

2 stops23h 50m

$306

OntarioChicago

ONT - MDW

ONTMDW

Ontario

mié. 3/4

8:40 am-4:16 pm

2 stops29h 36m

Chicago Midway

lun. 3/9

6:05 am-8:55 pm

2 stops16h 50m

$308

OntarioChicago

ONT - MDW

ONTMDW

Ontario

vie. 4/10

6:20 am-10:19 pm

2 stops13h 59m

Chicago Midway

dom. 4/12

5:11 pm-6:40 pm

1 stop27h 29m

$309

OntarioChicago

ONT - MDW

ONTMDW

Ontario

sáb. 2/28

1:15 pm-10:31 pm

1 stop7h 16m

Chicago Midway

sáb. 3/7

1:29 pm-9:05 pm

2 stops9h 36m

$312

OntarioChicago

ONT - MDW

ONTMDW

Ontario

mié. 3/4

7:17 pm-4:16 pm

2 stops18h 59m

Chicago Midway

dom. 3/8

6:45 pm-4:15 pm

1 stop23h 30m

$327

OntarioChicago

ONT - MDW

ONTMDW

Ontario

mié. 3/4

8:40 am-4:16 pm

2 stops29h 36m

Chicago Midway

dom. 3/8

2:41 pm-8:55 pm

2 stops32h 14m

$334

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 $232. 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 $368. 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 $461.

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 $351 when looking at flights departing in the afternoon. Try not to purchase tickets at noon because they tend to be around $451. 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 $393 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 $276 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.

Can stopping save me money on Ontario to Chicago Midway Airport flights?

You could potentially save up to 28% on your flight if you consider stops on a Ontario to Chicago Midway Airport flight.

How have Ontario to Chicago Midway Airport flight prices changed over time?

As of January 2026, prices for Ontario to Chicago Midway Airport flights are approximately 12% 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

$153

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 $153. The best round-trip flight deal from Ontario to Chicago Midway Airport found on momondo in the last 72 hours is $372.
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 3h 45m 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
5.7
3,056 reviews
Search Frontier flights
SouthwestPriceFrom $237Free CancellationRating
8.0
4,268 reviews
Search Southwest 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 $401, with the best Southwest deals starting from $237 round-trip. 4,268 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
Munster
Crown Point
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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