Which 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 49% of people opting to fly with this airline when travelling to Region of Ontario. Keep in mind that there are 3 different airlines that fly to Region of Ontario on a routine basis, so you have a few additional options to choose from.

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

As of August 2026, there are 105 flights per day flying from Illinois to Region of Ontario. The most common time of day flights depart is 8:00p.m., with 42% of flights taking off at noon.

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

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

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

As of August 2026, there are 736 flights per week flying from Illinois to Region of Ontario. The most common day of the week flights depart is Wed, with 17% 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 are updated daily.

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

There are 3 operators available for flights from Illinois to Ontario as of August 2026.

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 offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify 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 travel and health documents required for your trip to Ontario 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 Ontario. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

C$ 145 Cheap Flights from Illinois to Ontario in 2026

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Illinois to Ontario

Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

Enter your travel dates to find the best prices.

11:15 a.m. - 2:30 p.m.ORD Chicago O'Hare Intl-YUL Montreal Pierre Elliott Trudeau Intl

2h 15mdirect

4:30 p.m. - 8:41 p.m.YUL Montreal Pierre Elliott Trudeau Intl-ORD Chicago O'Hare Intl

5h 11m1 stop Toronto Island

C$ 320Air Canada

Mon, 28 Sep - Mon, 28 Sep

11:45 a.m. - 2:25 p.m.MDW Chicago Midway-YTZ Toronto Island

1h 40mdirect

10:10 a.m. - 11:00 a.m.YTZ Toronto Island-MDW Chicago Midway

1h 50mdirect

C$ 325Multiple Airlines

Wed, 16 Sep - Fri, 18 Sep

3:20 p.m. - 6:00 p.m.MDW Chicago Midway-YTZ Toronto Island

1h 40mdirect

10:10 a.m. - 11:00 a.m.YTZ Toronto Island-MDW Chicago Midway

1h 50mdirect

C$ 325Porter Airlines

Tue, 1 Sep - Thu, 17 Sep

3:15 p.m. - 5:55 p.m.MDW Chicago Midway-YTZ Toronto Island

1h 40mdirect

1:45 p.m. - 2:35 p.m.YTZ Toronto Island-MDW Chicago Midway

1h 50mdirect

C$ 325Porter Airlines

Mon, 31 Aug - Mon, 14 Sep

7:25 a.m. - 10:07 a.m.ORD Chicago O'Hare Intl-YTZ Toronto Island

1h 42mdirect

7:35 p.m. - 8:41 p.m.YTZ Toronto Island-ORD Chicago O'Hare Intl

2h 06mdirect

C$ 327Air Canada

Thu, 10 Sep - Sun, 13 Sep

7:25 a.m. - 10:07 a.m.ORD Chicago O'Hare Intl-YTZ Toronto Island

1h 42mdirect

12:20 p.m. - 8:12 p.m.YTZ Toronto Island-ORD Chicago O'Hare Intl

8h 52m2 stops Ottawa Montreal Pierre Elliott Trudeau Intl

C$ 327Air Canada

Fri, 25 Sep - Fri, 25 Sep

2:52 p.m. - 5:56 p.m.ORD Chicago O'Hare Intl-YYZ Toronto Pearson Intl

2h 04mdirect

8:00 p.m. - 12:28 a.m.YYZ Toronto Pearson Intl-ORD Chicago O'Hare Intl

5h 28m1 stop Newark

C$ 341United Airlines

Thu, 17 Sep - Thu, 17 Sep

7:09 a.m. - 9:54 a.m.ORD Chicago O'Hare Intl-YYZ Toronto Pearson Intl

1h 45mdirect

10:15 a.m. - 11:21 a.m.YYZ Toronto Pearson Intl-ORD Chicago O'Hare Intl

2h 06mdirect

C$ 354United Airlines

Fri, 11 Sep - Sun, 13 Sep

2:51 p.m. - 5:44 p.m.ORD Chicago O'Hare Intl-YYZ Toronto Pearson Intl

1h 53mdirect

6:30 a.m. - 7:40 a.m.YYZ Toronto Pearson Intl-ORD Chicago O'Hare Intl

2h 10mdirect

C$ 354American Airlines

Tue, 15 Sep - Wed, 16 Sep

8:30 p.m. - 11:26 p.m.ORD Chicago O'Hare Intl-YYZ Toronto Pearson Intl

1h 56mdirect

6:30 a.m. - 7:40 a.m.YYZ Toronto Pearson Intl-ORD Chicago O'Hare Intl

2h 10mdirect

C$ 354American Airlines

Fri, 25 Sep - Mon, 28 Sep

Cheap last-minute flights

Enter your travel dates to find the best prices.

3:15 p.m. - 5:55 p.m.MDW Chicago Midway-YTZ Toronto Island

1h 40mdirect

1:45 p.m. - 2:35 p.m.YTZ Toronto Island-MDW Chicago Midway

1h 50mdirect

C$ 343Porter Airlines

Fri, 14 Aug - Tue, 15 Sep

3:15 p.m. - 5:55 p.m.MDW Chicago Midway-YTZ Toronto Island

1h 40mdirect

10:10 a.m. - 11:00 a.m.YTZ Toronto Island-MDW Chicago Midway

1h 50mdirect

C$ 348Porter Airlines

Fri, 14 Aug - Sun, 20 Sep

10:25 a.m. - 1:05 p.m.MDW Chicago Midway-YTZ Toronto Island

1h 40mdirect

1:45 p.m. - 2:35 p.m.YTZ Toronto Island-MDW Chicago Midway

1h 50mdirect

C$ 440Porter Airlines

Tue, 18 Aug - Wed, 26 Aug

5:35 p.m. - 8:20 p.m.ORD Chicago O'Hare Intl-YYZ Toronto Pearson Intl

1h 45mdirect

8:05 a.m. - 9:00 a.m.YYZ Toronto Pearson Intl-ORD Chicago O'Hare Intl

1h 55mdirect

C$ 486Air Canada

Sat, 15 Aug - Thu, 17 Sep

8:40 p.m. - 11:24 p.m.ORD Chicago O'Hare Intl-YYZ Toronto Pearson Intl

1h 44mdirect

10:30 a.m. - 2:52 p.m.YYZ Toronto Pearson Intl-ORD Chicago O'Hare Intl

5h 22m1 stop Montreal Pierre Elliott Trudeau Intl

C$ 499Air Canada

Sat, 15 Aug - Thu, 17 Sep

3:40 p.m. - 9:55 p.m.ORD Chicago O'Hare Intl-YYZ Toronto Pearson Intl

5h 15m1 stop Montreal Pierre Elliott Trudeau Intl

10:30 a.m. - 2:52 p.m.YYZ Toronto Pearson Intl-ORD Chicago O'Hare Intl

5h 22m1 stop Montreal Pierre Elliott Trudeau Intl

C$ 511Air Canada

Sat, 15 Aug - Thu, 17 Sep

2:01 p.m. - 5:30 p.m.ORD Chicago O'Hare Intl-YUL Montreal Pierre Elliott Trudeau Intl

2h 29mdirect

9:45 a.m. - 11:21 a.m.YUL Montreal Pierre Elliott Trudeau Intl-ORD Chicago O'Hare Intl

2h 36mdirect

C$ 649United Airlines

Tue, 18 Aug - Tue, 25 Aug

2:01 p.m. - 5:30 p.m.ORD Chicago O'Hare Intl-YUL Montreal Pierre Elliott Trudeau Intl

2h 29mdirect

9:45 a.m. - 11:21 a.m.YUL Montreal Pierre Elliott Trudeau Intl-ORD Chicago O'Hare Intl

2h 36mdirect

C$ 649United Airlines

Tue, 18 Aug - Sat, 22 Aug

5:05 p.m. - 11:46 p.m.ORD Chicago O'Hare Intl-YYZ Toronto Pearson Intl

5h 41m1 stop Philadelphia

6:30 a.m. - 7:40 a.m.YYZ Toronto Pearson Intl-ORD Chicago O'Hare Intl

2h 10mdirect

C$ 666American Airlines

Sun, 16 Aug - Tue, 15 Sep

6:00 a.m. - 12:07 p.m.ORD Chicago O'Hare Intl-YYZ Toronto Pearson Intl

5h 07m1 stop New York LaGuardia

6:30 a.m. - 7:40 a.m.YYZ Toronto Pearson Intl-ORD Chicago O'Hare Intl

2h 10mdirect

C$ 666American Airlines

Fri, 14 Aug - Tue, 15 Sep

Cheap direct flights

Enter your travel dates to find the best prices.

3:20 p.m. - 6:00 p.m.MDW Chicago Midway-YTZ Toronto Island

1h 40mdirect

10:10 a.m. - 11:00 a.m.YTZ Toronto Island-MDW Chicago Midway

1h 50mdirect

C$ 325Porter Airlines

Tue, 1 Sep - Thu, 17 Sep

3:15 p.m. - 5:55 p.m.MDW Chicago Midway-YTZ Toronto Island

1h 40mdirect

1:45 p.m. - 2:35 p.m.YTZ Toronto Island-MDW Chicago Midway

1h 50mdirect

C$ 325Porter Airlines

Mon, 31 Aug - Mon, 14 Sep

11:45 a.m. - 2:25 p.m.MDW Chicago Midway-YTZ Toronto Island

1h 40mdirect

10:10 a.m. - 11:00 a.m.YTZ Toronto Island-MDW Chicago Midway

1h 50mdirect

C$ 325Multiple Airlines

Wed, 16 Sep - Fri, 18 Sep

7:25 a.m. - 10:07 a.m.ORD Chicago O'Hare Intl-YTZ Toronto Island

1h 42mdirect

7:35 p.m. - 8:41 p.m.YTZ Toronto Island-ORD Chicago O'Hare Intl

2h 06mdirect

C$ 327Air Canada

Thu, 10 Sep - Sun, 13 Sep

2:00 p.m. - 4:53 p.m.ORD Chicago O'Hare Intl-YTZ Toronto Island

1h 53mdirect

7:45 p.m. - 8:51 p.m.YTZ Toronto Island-ORD Chicago O'Hare Intl

2h 06mdirect

C$ 330Air Canada

Sat, 29 Aug - Sun, 6 Sep

2:00 p.m. - 4:42 p.m.ORD Chicago O'Hare Intl-YTZ Toronto Island

1h 42mdirect

12:15 p.m. - 1:21 p.m.YTZ Toronto Island-ORD Chicago O'Hare Intl

2h 06mdirect

C$ 330Air Canada

Sun, 13 Sep - Sun, 20 Sep

7:09 a.m. - 9:54 a.m.ORD Chicago O'Hare Intl-YYZ Toronto Pearson Intl

1h 45mdirect

10:15 a.m. - 11:21 a.m.YYZ Toronto Pearson Intl-ORD Chicago O'Hare Intl

2h 06mdirect

C$ 354United Airlines

Fri, 11 Sep - Sun, 13 Sep

7:09 a.m. - 9:54 a.m.ORD Chicago O'Hare Intl-YYZ Toronto Pearson Intl

1h 45mdirect

9:00 p.m. - 10:05 p.m.YYZ Toronto Pearson Intl-ORD Chicago O'Hare Intl

2h 05mdirect

C$ 354United Airlines

Wed, 16 Sep - Tue, 22 Sep

2:51 p.m. - 5:44 p.m.ORD Chicago O'Hare Intl-YYZ Toronto Pearson Intl

1h 53mdirect

6:30 a.m. - 7:40 a.m.YYZ Toronto Pearson Intl-ORD Chicago O'Hare Intl

2h 10mdirect

C$ 354American Airlines

Tue, 15 Sep - Wed, 16 Sep

8:30 p.m. - 11:26 p.m.ORD Chicago O'Hare Intl-YYZ Toronto Pearson Intl

1h 56mdirect

6:30 a.m. - 7:40 a.m.YYZ Toronto Pearson Intl-ORD Chicago O'Hare Intl

2h 10mdirect

C$ 354American Airlines

Fri, 25 Sep - Mon, 28 Sep

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Lufthansa flights from Illinois to Region of Ontario

Our best Lufthansa deals on Illinois to Region of Ontario flight tickets

Lufthansa

10 Sep

ORD12:59 p.m.Chicago O'Hare Intl

1h 47m

YYZ3:46 p.m.Toronto Pearson Intl

13 Sep

YYZ8:50 a.m.Toronto Pearson Intl

2h 03m

ORD9:53 a.m.Chicago O'Hare Intl

C$ 339

Lufthansa

10 Sep

ORD4:35 p.m.Chicago O'Hare Intl

2h 02m

YYZ7:37 p.m.Toronto Pearson Intl

13 Sep

YYZ7:00 a.m.Toronto Pearson Intl

2h 00m

ORD8:00 a.m.Chicago O'Hare Intl

C$ 348

KLM flights from Illinois to Region of Ontario

Our best KLM deals on Illinois to Region of Ontario flight tickets

KLM

10 Sep

MDW5:37 p.m.Chicago Midway

4h 22m

1 stop

YYZ10:59 p.m.Toronto Pearson Intl

13 Sep

YYZ6:00 a.m.Toronto Pearson Intl

4h 07m

1 stop

MDW9:07 a.m.Chicago Midway

C$ 543

KLM

15 Aug

MDW9:24 a.m.Chicago Midway

5h 56m

1 stop

YUL4:20 p.m.Montreal Pierre Elliott Trudeau Intl

19 Aug

YUL7:00 a.m.Montreal Pierre Elliott Trudeau Intl

10h 15m

1 stop

MDW4:15 p.m.Chicago Midway

C$ 649

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

ChicagoMontreal

ORD Chicago O'Hare Intl - YUL Montreal Pierre Elliott Trudeau Intl

ORDYUL

Chicago O'Hare Intl

Mon 28/9

11:15 a.m.-2:30 p.m.

Nonstop2h 15m

Montreal Pierre Elliott Trudeau Intl

Mon 28/9

4:30 p.m.-8:41 p.m.

1 stop5h 11m

C$ 320

Quickest round-trip

ChicagoToronto

MDW Chicago Midway - YTZ Toronto Island

MDWYTZ

Chicago Midway

Wed 16/9

11:45 a.m.-2:25 p.m.

Nonstop1h 40m

Toronto Island

Fri 18/9

10:10 a.m.-11:00 a.m.

Nonstop1h 50m

C$ 325

ChicagoToronto

MDW Chicago Midway - YTZ Toronto Island

MDWYTZ

Chicago Midway

Tue 1/9

3:20 p.m.-6:00 p.m.

Nonstop1h 40m

Toronto Island

Thu 17/9

10:10 a.m.-11:00 a.m.

Nonstop1h 50m

C$ 325

ChicagoToronto

MDW Chicago Midway - YTZ Toronto Island

MDWYTZ

Chicago Midway

Mon 31/8

3:15 p.m.-5:55 p.m.

Nonstop1h 40m

Toronto Island

Mon 14/9

1:45 p.m.-2:35 p.m.

Nonstop1h 50m

C$ 325

ChicagoToronto

ORD Chicago O'Hare Intl - YTZ Toronto Island

ORDYTZ

Chicago O'Hare Intl

Thu 10/9

7:25 a.m.-10:07 a.m.

Nonstop1h 42m

Toronto Island

Sun 13/9

7:35 p.m.-8:41 p.m.

Nonstop2h 06m

C$ 327

ChicagoToronto

ORD Chicago O'Hare Intl - YTZ Toronto Island

ORDYTZ

Chicago O'Hare Intl

Fri 25/9

7:25 a.m.-10:07 a.m.

Nonstop1h 42m

Toronto Island

Fri 25/9

12:20 p.m.-8:12 p.m.

2 stops8h 52m

C$ 327

ChicagoToronto

ORD Chicago O'Hare Intl - YYZ Toronto Pearson Intl

ORDYYZ

Chicago O'Hare Intl

Thu 17/9

2:52 p.m.-5:56 p.m.

Nonstop2h 04m

Toronto Pearson Intl

Thu 17/9

8:00 p.m.-12:28 a.m.

1 stop5h 28m

C$ 341

ChicagoToronto

ORD Chicago O'Hare Intl - YYZ Toronto Pearson Intl

ORDYYZ

Chicago O'Hare Intl

Fri 11/9

7:09 a.m.-9:54 a.m.

Nonstop1h 45m

Toronto Pearson Intl

Sun 13/9

10:15 a.m.-11:21 a.m.

Nonstop2h 06m

C$ 354

ChicagoToronto

ORD Chicago O'Hare Intl - YYZ Toronto Pearson Intl

ORDYYZ

Chicago O'Hare Intl

Tue 15/9

2:51 p.m.-5:44 p.m.

Nonstop1h 53m

Toronto Pearson Intl

Wed 16/9

6:30 a.m.-7:40 a.m.

Nonstop2h 10m

C$ 354

ChicagoToronto

ORD Chicago O'Hare Intl - YYZ Toronto Pearson Intl

ORDYYZ

Chicago O'Hare Intl

Fri 25/9

8:30 p.m.-11:26 p.m.

Nonstop1h 56m

Toronto Pearson Intl

Mon 28/9

6:30 a.m.-7:40 a.m.

Nonstop2h 10m

C$ 354

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?

In general, February is the cheapest month to fly from Illinois to Region of Ontario. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around C$ 396. If you are unable to visit Region of Ontario during the month of February, then departing from Illinois during the month November is also very affordable. Most momondo users find prices during this month for around C$ 414.

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

The cheapest day to depart from Illinois to Region of Ontario is on a Tuesday. Travellers who choose to depart for Region of Ontario on a Tuesday will often find tickets for as low as C$ 372. The most expensive day to fly to Region of Ontario is Saturday, with ticket prices averaging around C$ 523.

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

Our most recent data shows that the best time of day to fly to Region of Ontario is in the evening. Flights from Illinois to Region of Ontario during this time can be as low as C$ 337. If you have a flexible travel schedule, then try to avoid flying at noon when prices are C$ 495 on average. Flights to Region of Ontario from Illinois at noon are generally more expensive because this time of day is more convenient for travellers’ schedules.

What is the cheapest Illinois to Ontario flight route?

Fly from Chicago O'Hare Intl 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 C$ 465 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 C$ 379 on momondo.

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

There are 3 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	C$ 164
Fastest flight time	1h 37m
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 C$ 164. The best round-trip flight deal from Illinois to Region of Ontario found on momondo in the last 72 hours is C$ 139.

The fastest flight from Illinois to Region of Ontario takes 1h 37m

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 are updated daily.
How many operators does momondo search for flights from Illinois to Ontario?
There are 3 operators available for flights from Illinois to Ontario as of August 2026.
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 offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify 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 travel and health documents required for your trip to Ontario 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 Ontario. 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 Illinois to Region of Ontario?
Based on momondo bookings for flights between Illinois and Region of Ontario, the leading plane model is De Havilland (Bombardier) DHC-8-400 Dash 8Q, making up 21.13% of the total bookings. Other popular models include Embraer 175 with 12.54%, Boeing 787-8 Dreamliner with 10.96%, and Embraer 175 (Enhanced Winglets) with 6.90%.

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
American Airlines	PriceFrom C$ 136	Free Cancellation	Rating 7.1 11,918 reviews	Search American Airlines flights
Air Canada	PriceFrom C$ 287	Free Cancellation	Rating 7.1 11,466 reviews	Search Air Canada flights
United Airlines	PriceFrom C$ 344	Free Cancellation	Rating 7.4 10,115 reviews	Search United Airlines flights

Why use momondo?

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

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Illinois to Ontario . Millions of users trust and use momondo every year so you are in good hands.

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

Yes. momondo enables you to select and highlight flights to Ontario from Illinois with this policy.

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

momondo provides multiple filters to help you find the best flight to Ontario from Illinois. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

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 C$ 120

Flights to Vancouverfrom C$ 100

Flights to Montrealfrom C$ 269

Flights to Calgaryfrom C$ 121

Flights to Halifaxfrom C$ 176

Flights to Winnipegfrom C$ 131

Flights to Ottawafrom C$ 202

Flights to Kelownafrom C$ 143

Flights to Saskatoonfrom C$ 185

Flights to St. John'sfrom C$ 231

Flights to Reginafrom C$ 223

Flights to Québec Cityfrom C$ 308

Cheap flights from Illinois to Ontario from C$ 145

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 15/9. 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

Cheap direct flights

Big names, great deals

Big names, great deals

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Filter for what you want

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Lufthansa flights from Illinois to Region of Ontario

Our best Lufthansa deals on Illinois to Region of Ontario flight tickets

KLM flights from Illinois to Region of Ontario

Our best KLM deals on Illinois to Region of Ontario flight tickets

momondo Fare Finder

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?

Which 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?

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

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