What is the cheapest airline that flies from Illinois to Ontario?

Porter Airlines, Delta, and Air Canada are the most popular carriers operating from Illinois to Ontario

What airlines fly to Region of Ontario?

United Airlines, Air Canada and American Airlines are the top three most popular airlines that fly to Region of Ontario from Illinois according to our data. United Airlines is the first choice among our users, with 39% of people opting to fly with this airline when traveling to Region of Ontario. Keep in mind that there are 6 different airlines that fly to Region of Ontario on a routine basis, so you have a few additional options to choose from.

How long is the flight from Illinois to Region of Ontario?

Average flight duration from Illinois to Region of Ontario depends on which airport you fly into and out of. Flying from Chicago to Toronto Pearson Intl Airport is 2h 24m on average, while flying from Moline to Toronto Pearson Intl Airport is 5h 19m on average. Toronto Pearson Intl Airport is the most popular airport in Region of Ontario.

How many flights depart from Illinois to Region of Ontario on average per day?

As of September 2026, there are 69 flights per day flying from Illinois to Region of Ontario. The most common time of day flights depart is 10:00AM, with 40% of flights taking off at noon.

How many flights depart from Illinois to Region of Ontario on average per week?

As of September 2026, there are 489 flights per week flying from Illinois to Region of Ontario. The most common day of the week flights depart is Tue, with 18% of flights taking off on this day.

When did momondo last update prices for flights from Illinois to Ontario?

Prices for flights from Illinois to Ontario were last updated today.

How many operators does momondo search for flights from Illinois to Ontario?

As of September 2026, there are 6 operators available to choose from for flights from Illinois to Ontario.

How old do you have to be to fly from Illinois to Ontario?

The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Illinois to Ontario.

What documentation or ID do you need to fly to Ontario?

The required travel and health documents for your Ontario trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Ontario. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

$110 Cheap Flights from Illinois to Ontario in 2026/27

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Illinois to Ontario

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One-way

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Cheap round-trip flights

Enter your travel dates to find the best prices.

6:20 pm - 9:06 pmORD Chicago O'Hare Intl-YTZ Toronto Island

1h 46mnonstop

4:35 pm - 5:40 pmYTZ Toronto Island-ORD Chicago O'Hare Intl

2h 05mnonstop

$242Porter Airlines

Tue, Oct 27 - Fri, Oct 30

8:45 am - 11:27 amORD Chicago O'Hare Intl-YYZ Toronto Pearson Intl

1h 42mnonstop

8:20 am - 9:23 amYYZ Toronto Pearson Intl-ORD Chicago O'Hare Intl

2h 03mnonstop

$250Air Canada

Tue, Oct 27 - Fri, Oct 30

6:20 pm - 9:06 pmORD Chicago O'Hare Intl-YTZ Toronto Island

1h 46mnonstop

4:35 pm - 5:40 pmYTZ Toronto Island-ORD Chicago O'Hare Intl

2h 05mnonstop

$283Air Transat

Fri, Nov 13 - Tue, Nov 17

12:20 pm - 3:06 pmORD Chicago O'Hare Intl-YTZ Toronto Island

1h 46mnonstop

4:35 pm - 5:40 pmYTZ Toronto Island-ORD Chicago O'Hare Intl

2h 05mnonstop

$283Air Transat

Fri, Nov 13 - Mon, Nov 16

6:20 pm - 9:06 pmORD Chicago O'Hare Intl-YTZ Toronto Island

1h 46mnonstop

10:35 am - 11:40 amYTZ Toronto Island-ORD Chicago O'Hare Intl

2h 05mnonstop

$292Porter Airlines

Tue, Nov 17 - Thu, Nov 19

8:45 am - 3:23 pmORD Chicago O'Hare Intl-YYZ Toronto Pearson Intl

5h 38m1 stop Montreal Pierre Elliott Trudeau Intl

2:00 pm - 2:55 pmYYZ Toronto Pearson Intl-ORD Chicago O'Hare Intl

1h 55mnonstop

$382Air Canada

Wed, Oct 21 - Sat, Oct 24

6:44 pm - 10:57 pmMDW Chicago Midway-YYZ Toronto Pearson Intl

3h 13m1 stop Detroit Metropolitan Wayne County

12:15 pm - 6:04 pmYYZ Toronto Pearson Intl-MDW Chicago Midway

6h 49m1 stop Detroit Metropolitan Wayne County

$407Delta

Sat, Nov 21 - Sat, Nov 28

9:29 am - 1:36 pmMDW Chicago Midway-YYZ Toronto Pearson Intl

3h 07m1 stop Detroit Metropolitan Wayne County

9:40 am - 12:47 pmYYZ Toronto Pearson Intl-MDW Chicago Midway

4h 07m1 stop Detroit Metropolitan Wayne County

$412Delta

Wed, Oct 28 - Tue, Nov 3

11:45 am - 2:33 pmORD Chicago O'Hare Intl-YYZ Toronto Pearson Intl

1h 48mnonstop

6:25 pm - 7:30 pmYYZ Toronto Pearson Intl-ORD Chicago O'Hare Intl

2h 05mnonstop

$416Qantas Airways

Sat, Oct 24 - Sat, Oct 31

8:06 am - 10:59 amORD Chicago O'Hare Intl-YYZ Toronto Pearson Intl

1h 53mnonstop

6:25 pm - 7:30 pmYYZ Toronto Pearson Intl-ORD Chicago O'Hare Intl

2h 05mnonstop

$442American Airlines

Sat, Oct 24 - Sat, Oct 24

Cheap last minute flights

Enter your travel dates to find the best prices.

8:03 am - 10:59 amORD Chicago O'Hare Intl-YYZ Toronto Pearson Intl

1h 56mnonstop

8:05 am - 9:00 amYYZ Toronto Pearson Intl-ORD Chicago O'Hare Intl

1h 55mnonstop

$293Air Canada

Sat, Oct 3 - Sun, Oct 4

3:45 pm - 6:31 pmORD Chicago O'Hare Intl-YYZ Toronto Pearson Intl

1h 46mnonstop

8:05 am - 9:00 amYYZ Toronto Pearson Intl-ORD Chicago O'Hare Intl

1h 55mnonstop

$337Air Canada

Sat, Oct 3 - Sun, Oct 4

9:45 am - 12:35 pmORD Chicago O'Hare Intl-YYZ Toronto Pearson Intl

1h 50mnonstop

12:08 pm - 6:26 pmYYZ Toronto Pearson Intl-ORD Chicago O'Hare Intl

7h 18m1 stop Detroit Metropolitan Wayne County

$339Multiple Airlines

Sat, Oct 3 - Sun, Oct 4

9:45 am - 12:35 pmORD Chicago O'Hare Intl-YYZ Toronto Pearson Intl

1h 50mnonstop

12:08 pm - 6:26 pmYYZ Toronto Pearson Intl-ORD Chicago O'Hare Intl

7h 18m1 stop Detroit Metropolitan Wayne County

$340Multiple Airlines

Sat, Oct 3 - Sun, Oct 4

11:45 am - 2:25 pmMDW Chicago Midway-YTZ Toronto Island

1h 40mnonstop

1:45 pm - 2:35 pmYTZ Toronto Island-MDW Chicago Midway

1h 50mnonstop

$402Porter Airlines

Sat, Oct 3 - Sat, Oct 10

3:20 pm - 6:00 pmMDW Chicago Midway-YTZ Toronto Island

1h 40mnonstop

10:10 am - 11:00 amYTZ Toronto Island-MDW Chicago Midway

1h 50mnonstop

$422Porter Airlines

Thu, Oct 1 - Fri, Oct 2

8:30 pm - 11:29 pmORD Chicago O'Hare Intl-YYZ Toronto Pearson Intl

1h 59mnonstop

6:25 pm - 7:30 pmYYZ Toronto Pearson Intl-ORD Chicago O'Hare Intl

2h 05mnonstop

$442American Airlines

Tue, Oct 6 - Fri, Oct 23

8:30 pm - 11:29 pmORD Chicago O'Hare Intl-YYZ Toronto Pearson Intl

1h 59mnonstop

1:15 pm - 2:20 pmYYZ Toronto Pearson Intl-ORD Chicago O'Hare Intl

2h 05mnonstop

$442American Airlines

Tue, Oct 6 - Fri, Oct 23

9:29 am - 3:15 pmMDW Chicago Midway-YYZ Toronto Pearson Intl

4h 46m1 stop Detroit Metropolitan Wayne County

6:00 am - 9:07 amYYZ Toronto Pearson Intl-MDW Chicago Midway

4h 07m1 stop Detroit Metropolitan Wayne County

$460Delta

Sat, Oct 3 - Sun, Oct 4

9:29 am - 5:20 pmMDW Chicago Midway-YYZ Toronto Pearson Intl

6h 51m1 stop Detroit Metropolitan Wayne County

12:10 pm - 6:00 pmYYZ Toronto Pearson Intl-MDW Chicago Midway

6h 50m1 stop Detroit Metropolitan Wayne County

$468Delta

Mon, Oct 5 - Thu, Oct 8

Cheap direct flights

Enter your travel dates to find the best prices.

6:20 pm - 9:06 pmORD Chicago O'Hare Intl-YTZ Toronto Island

1h 46mnonstop

4:35 pm - 5:40 pmYTZ Toronto Island-ORD Chicago O'Hare Intl

2h 05mnonstop

$242Porter Airlines

Tue, Oct 27 - Fri, Oct 30

8:45 am - 11:27 amORD Chicago O'Hare Intl-YYZ Toronto Pearson Intl

1h 42mnonstop

8:20 am - 9:23 amYYZ Toronto Pearson Intl-ORD Chicago O'Hare Intl

2h 03mnonstop

$250Air Canada

Tue, Oct 27 - Fri, Oct 30

12:20 pm - 3:06 pmORD Chicago O'Hare Intl-YTZ Toronto Island

1h 46mnonstop

10:35 am - 11:40 amYTZ Toronto Island-ORD Chicago O'Hare Intl

2h 05mnonstop

$283Air Transat

Mon, Oct 26 - Tue, Oct 27

6:20 pm - 9:06 pmORD Chicago O'Hare Intl-YTZ Toronto Island

1h 46mnonstop

4:35 pm - 5:40 pmYTZ Toronto Island-ORD Chicago O'Hare Intl

2h 05mnonstop

$283Air Transat

Fri, Nov 13 - Tue, Nov 17

12:20 pm - 3:06 pmORD Chicago O'Hare Intl-YTZ Toronto Island

1h 46mnonstop

10:35 am - 11:40 amYTZ Toronto Island-ORD Chicago O'Hare Intl

2h 05mnonstop

$292Porter Airlines

Fri, Dec 11 - Sun, Dec 13

10:15 am - 12:52 pmORD Chicago O'Hare Intl-YYZ Toronto Pearson Intl

1h 37mnonstop

12:00 pm - 1:13 pmYYZ Toronto Pearson Intl-ORD Chicago O'Hare Intl

2h 13mnonstop

$385Air Canada

Thu, Nov 5 - Sun, Nov 8

11:45 am - 2:33 pmORD Chicago O'Hare Intl-YYZ Toronto Pearson Intl

1h 48mnonstop

6:25 pm - 7:30 pmYYZ Toronto Pearson Intl-ORD Chicago O'Hare Intl

2h 05mnonstop

$416Qantas Airways

Sat, Oct 24 - Sat, Oct 31

8:06 am - 10:59 amORD Chicago O'Hare Intl-YYZ Toronto Pearson Intl

1h 53mnonstop

6:25 pm - 7:30 pmYYZ Toronto Pearson Intl-ORD Chicago O'Hare Intl

2h 05mnonstop

$442American Airlines

Sat, Oct 24 - Sat, Oct 24

2:50 pm - 5:44 pmORD Chicago O'Hare Intl-YYZ Toronto Pearson Intl

1h 54mnonstop

1:15 pm - 2:20 pmYYZ Toronto Pearson Intl-ORD Chicago O'Hare Intl

2h 05mnonstop

$442American Airlines

Sat, Oct 17 - Tue, Oct 20

4:33 pm - 7:37 pmORD Chicago O'Hare Intl-YYZ Toronto Pearson Intl

2h 04mnonstop

3:35 pm - 4:44 pmYYZ Toronto Pearson Intl-ORD Chicago O'Hare Intl

2h 09mnonstop

$464United Airlines

Tue, Oct 20 - Wed, Oct 28

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American Airlines flights from Illinois to Region of Ontario

Our best American Airlines deals on Illinois to Region of Ontario flight tickets

American Airlines

Oct 9

ORD8:30 pmChicago O'Hare Intl

1h 59m

YYZ11:29 pmToronto Pearson Intl

Oct 14

YYZ7:29 amToronto Pearson Intl

2h 10m

ORD8:39 amChicago O'Hare Intl

$442

American Airlines

Oct 9

ORD8:30 pmChicago O'Hare Intl

1h 59m

YYZ11:29 pmToronto Pearson Intl

Oct 12

YYZ7:29 amToronto Pearson Intl

2h 10m

ORD8:39 amChicago O'Hare Intl

$443

American Airlines

Oct 7

ORD10:20 amChicago O'Hare Intl

5h 27m

1 stop

YYZ4:47 pmToronto Pearson Intl

Oct 8

YYZ7:29 amToronto Pearson Intl

2h 10m

ORD8:39 amChicago O'Hare Intl

$452

Air Canada flights from Illinois to Region of Ontario

Our best Air Canada deals on Illinois to Region of Ontario flight tickets

Air Canada

Oct 27

ORD8:45 amChicago O'Hare Intl

1h 42m

YYZ11:27 amToronto Pearson Intl

Oct 30

YYZ8:20 amToronto Pearson Intl

2h 03m

ORD9:23 amChicago O'Hare Intl

$250

Air Canada

Oct 3

ORD8:03 amChicago O'Hare Intl

1h 56m

YYZ10:59 amToronto Pearson Intl

Oct 4

YYZ8:05 amToronto Pearson Intl

1h 55m

ORD9:00 amChicago O'Hare Intl

$293

Air Canada

Oct 3

ORD3:45 pmChicago O'Hare Intl

1h 46m

YYZ6:31 pmToronto Pearson Intl

Oct 4

YYZ8:05 amToronto Pearson Intl

1h 55m

ORD9:00 amChicago O'Hare Intl

$337

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

ChicagoToronto

ORD Chicago O'Hare Intl - YTZ Toronto Island

ORDYTZ

Chicago O'Hare Intl

Tue 10/27

6:20 pm-9:06 pm

Nonstop1h 46m

Toronto Island

Fri 10/30

4:35 pm-5:40 pm

Nonstop2h 05m

$242

Quickest round-trip

ChicagoToronto

ORD Chicago O'Hare Intl - YYZ Toronto Pearson Intl

ORDYYZ

Chicago O'Hare Intl

Tue 10/27

8:45 am-11:27 am

Nonstop1h 42m

Toronto Pearson Intl

Fri 10/30

8:20 am-9:23 am

Nonstop2h 03m

$250

ChicagoToronto

ORD Chicago O'Hare Intl - YTZ Toronto Island

ORDYTZ

Chicago O'Hare Intl

Fri 11/13

6:20 pm-9:06 pm

Nonstop1h 46m

Toronto Island

Tue 11/17

4:35 pm-5:40 pm

Nonstop2h 05m

$283

ChicagoToronto

ORD Chicago O'Hare Intl - YTZ Toronto Island

ORDYTZ

Chicago O'Hare Intl

Fri 11/13

12:20 pm-3:06 pm

Nonstop1h 46m

Toronto Island

Mon 11/16

4:35 pm-5:40 pm

Nonstop2h 05m

$283

ChicagoToronto

ORD Chicago O'Hare Intl - YTZ Toronto Island

ORDYTZ

Chicago O'Hare Intl

Tue 11/17

6:20 pm-9:06 pm

Nonstop1h 46m

Toronto Island

Thu 11/19

10:35 am-11:40 am

Nonstop2h 05m

$292

ChicagoToronto

ORD Chicago O'Hare Intl - YYZ Toronto Pearson Intl

ORDYYZ

Chicago O'Hare Intl

Wed 10/21

8:45 am-3:23 pm

1 stop5h 38m

Toronto Pearson Intl

Sat 10/24

2:00 pm-2:55 pm

Nonstop1h 55m

$382

ChicagoToronto

MDW Chicago Midway - YYZ Toronto Pearson Intl

MDWYYZ

Chicago Midway

Sat 11/21

6:44 pm-10:57 pm

1 stop3h 13m

Toronto Pearson Intl

Sat 11/28

12:15 pm-6:04 pm

1 stop6h 49m

$407

ChicagoToronto

MDW Chicago Midway - YYZ Toronto Pearson Intl

MDWYYZ

Chicago Midway

Wed 10/28

9:29 am-1:36 pm

1 stop3h 07m

Toronto Pearson Intl

Tue 11/3

9:40 am-12:47 pm

1 stop4h 07m

$412

ChicagoToronto

ORD Chicago O'Hare Intl - YYZ Toronto Pearson Intl

ORDYYZ

Chicago O'Hare Intl

Sat 10/24

11:45 am-2:33 pm

Nonstop1h 48m

Toronto Pearson Intl

Sat 10/31

6:25 pm-7:30 pm

Nonstop2h 05m

$416

ChicagoToronto

ORD Chicago O'Hare Intl - YYZ Toronto Pearson Intl

ORDYYZ

Chicago O'Hare Intl

Sat 10/24

8:06 am-10:59 am

Nonstop1h 53m

Toronto Pearson Intl

Sat 10/24

6:25 pm-7:30 pm

Nonstop2h 05m

$442

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from Illinois to Region of Ontario

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

Prices

Airlines

Other information

What is the cheapest month to fly to Region of Ontario?

The month of February is, on average, the cheapest month to fly to Region of Ontario from Illinois, with most prices found around $288. If you aren’t able to travel during the month of February, then book flights to Region of Ontario from Illinois during June instead. Flights to Region of Ontario in June, while not as cheap as those in February, still average around $304.

What is the cheapest day to depart on your flight to Region of Ontario?

According to our data, Thursday is the cheapest day to fly to Region of Ontario from Illinois. The lowest ticket price found for a Thursday departure recently was $416. Keep in mind that prices can always vary depending on your route and whether or not you are flying domestic or international. Flights from Illinois to Region of Ontario on a Monday will generally be more expensive and average around $636. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

What is the cheapest time of day to depart on your flight to Region of Ontario?

According to our data, the cheapest time of day to fly to Region of Ontario is in the evening. momondo users have found flights departing from Illinois to Region of Ontario in the evening for as low as $419. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Flights in the afternoon are often more expensive with an average ticket price of $794.

What is the cheapest Illinois to Ontario flight route?

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

How far in advance should I book a flight from Illinois to Ontario?

You are more likely to see cheaper flights to Region of Ontario from Illinois when booking weeks ahead of your departure date. In general, you can expect to find flights to Region of Ontario for around $334 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Region of Ontario from Illinois for as low as $272 on momondo.

What cabin class options are available on Illinois to Region of Ontario flights?

There are 4 cabin classes available to choose from on Illinois to Region of Ontario 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 Illinois to Region of Ontario flights?

No. A direct flight is the cheapest option for a flight between Illinois to Region of Ontario.

Cheap Illinois to Region of Ontario flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Illinois to Region of Ontario

Best Price Found	$110
Fastest flight time	1h 33m
Direct flights	Every day
Airports in Region of Ontario	125 airports

The best one-way flight to Region of Ontario from Illinois in the past 72 hours is $110. The best round-trip flight deal from Illinois to Region of Ontario found on momondo in the last 72 hours is $242.

The fastest flight from Illinois to Region of Ontario takes 1h 33m

Direct flights go from Illinois to Region of Ontario every day.

There are 125 airports in Region of Ontario. From Illinois there are direct flights to Toronto Pearson Intl (YYZ), Toronto Island (YTZ).

Search flight deals

Frequently asked questions about flying from Illinois to Ontario

When did momondo last update prices for flights from Illinois to Ontario?
Prices for flights from Illinois to Ontario were last updated today.
How many operators does momondo search for flights from Illinois to Ontario?
As of September 2026, there are 6 operators available to choose from for flights from Illinois to Ontario.
How old do you have to be to fly from Illinois to Ontario?
The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Illinois to Ontario.
What documentation or ID do you need to fly to Ontario?
The required travel and health documents for your Ontario trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Ontario. We recommend that you seek guidance from your airline or a reliable third party such as IATA.
What is the most popular plane model from Illinois to Region of Ontario?
momondo data reveals that the most frequently booked plane model on the route from Illinois to Region of Ontario is De Havilland (Bombardier) DHC-8-400 Dash 8Q, representing 23.65% of all bookings. The subsequent popular models are Embraer 175 at 12.55%, Embraer 175 (Enhanced Winglets) at 9.89%, and Boeing 737-800 at 6.20%.

Best airlines flying from Illinois to Region of Ontario

Compare and see reviews for airlines that fly from Illinois to Region of Ontario with momondo

Airline	Rating	Free Cancellation	Price
Delta	PriceFrom $88	Free Cancellation	Rating 7.8 8,611 reviews	Search Delta flights
Qantas Airways	PriceFrom $160	Free Cancellation	Rating 7.5 1,101 reviews	Search Qantas Airways flights
Air Canada	PriceFrom $170	Free Cancellation	Rating 7.1 11,707 reviews	Search Air Canada flights
Porter Airlines	PriceFrom $193	Free Cancellation	Rating 8.0 467 reviews	Search Porter Airlines flights
United Airlines	PriceFrom $222	Free Cancellation	Rating 7.4 10,270 reviews	Search United Airlines flights
American Airlines	PriceFrom $223	Free Cancellation	Rating 7.0 12,097 reviews	Search American Airlines flights

Why use momondo?

Why should I use momondo to find a flight deal from Illinois to Ontario?

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Ontario from Illinois.

Can I find flights from Illinois to Ontario with flexible booking policies on momondo?

Yes. All flights to Ontario from Illinois on momondo can be compared and filtered by various policies on offer, including flexible booking.

How can momondo help me find flights from Illinois to Ontario?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Illinois to Ontario.

I’m not ready to book a flight from Illinois to Ontario right now. Can momondo alert me if prices change?

Yes. momondo can track prices for Illinois to Ontario 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 Region of Ontario trip

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Popular cities in Ontario

Flights to Torontofrom $161

Flights to Vancouverfrom $158

Flights to Montrealfrom $210

Flights to Calgaryfrom $170

Flights to Ottawafrom $219

Flights to Halifaxfrom $247

Flights to Winnipegfrom $280

Flights to Québec Cityfrom $362

Flights to Kelownafrom $191

Flights to St. John'sfrom $368

Flights to Saskatoonfrom $230

Flights to Reginafrom $386

Cheap flights from Illinois to Ontario from $110

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Illinois to Ontario departing on 11/13. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

Find the cheapest flights from Illinois to Ontario

Cheap round-trip flights

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Cheap last minute flights

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Filter for what you want

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American Airlines flights from Illinois to Region of Ontario

Our best American Airlines deals on Illinois to Region of Ontario flight tickets

Air Canada flights from Illinois to Region of Ontario

Our best Air Canada deals on Illinois to Region of Ontario flight tickets

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Use the filters below to find and compare flights from Illinois to Ontario that are best for you.

See travel insights to Ontario from

How to get the cheapest flight ticket from Illinois to Region of Ontario

What is the cheapest month to fly to Region of Ontario?

What is the cheapest day to depart on your flight to Region of Ontario?

What is the cheapest time of day to depart on your flight to Region of Ontario?

What is the cheapest Illinois to Ontario flight route?

How far in advance should I book a flight from Illinois to Ontario?

What cabin class options are available on Illinois to Region of Ontario flights?

Can stopping save me money on Illinois to Region of Ontario flights?

What is the cheapest airline that flies from Illinois to Ontario?

What airlines fly to Region of Ontario?

How many flights depart from Illinois to Region of Ontario on average per day?

How many flights depart from Illinois to Region of Ontario on average per week?

How long is the flight from Illinois to Region of Ontario?

Cheap Illinois to Region of Ontario flight deals and tips

Best Price Found

Fastest flight time

Direct flights

Airports in Region of Ontario

Frequently asked questions about flying from Illinois to Ontario

Best airlines flying from Illinois to Region of Ontario

Compare and see reviews for airlines that fly from Illinois to Region of Ontario with momondo

Why use momondo?

An easier way to manage your Region of Ontario 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.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to Ontario

Popular cities in Ontario

Popular flights according to clicks in the last 7 days on momondo

Illinois flight routes

According to popular flight searches on momondo this year

Region of Ontario flight routes

According to popular flight searches on momondo this year

Fly your favorite airline to Ontario

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According to popular flight searches on momondo this year