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

Porter Airlines, Air Canada, and United Airlines are the most popular carriers operating from Montreal to Illinois

How many flights depart from Montreal to Illinois on average per day?

The number of flights available between Montreal and Illinois is 32 per day as of September 2025. The most frequent departure time is 6:00a.m., with 47% of daily flights leaving in the afternoon.

Which airlines fly to Illinois?

Air Canada, Porter Airlines and United Airlines are the top three most popular airlines that fly to Illinois from Montreal according to our data. Air Canada is the first choice among our users, with 69% of people opting to fly with this airline when travelling to Illinois. Keep in mind that there are 5 different airlines that fly to Illinois on a routine basis, so you have a few additional options to choose from.

How many flights depart from Montreal to Illinois on average per week?

The number of flights available between Montreal and Illinois is 230 per week as of September 2025. The most frequent departure day is Mon, with 14% of weekly flights leaving on this day.

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

Prices for flights from Montreal to Illinois are refreshed on a daily basis.

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

There are 5 operators available for flights from Montreal to Illinois as of September 2025.

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

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 Montreal to Illinois.

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

The travel and health documents required for your trip to Illinois 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 Illinois. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

C$ 196 Cheap Flights from Montreal to Illinois in 2025/26

1 adult

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Find the cheapest flights from Montreal to Illinois

Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

1:10 p.m. - 4:24 p.m.YUL-MDW

4h 14m1 stop

9:35 a.m. - 4:00 p.m.MDW-YUL

5h 25m1 stop

C$ 323Porter Airlines

Find Deal

Fri, 17 Oct - Mon, 20 Oct

1:10 p.m. - 4:24 p.m.YUL-MDW

4h 14m1 stop

9:35 a.m. - 4:00 p.m.MDW-YUL

5h 25m1 stop

C$ 325Porter Airlines

Find Deal

Fri, 17 Oct - Mon, 20 Oct

6:15 p.m. - 8:00 p.m.YUL-ORD

2h 45mdirect

7:15 a.m. - 10:20 a.m.ORD-YUL

2h 05mdirect

C$ 333Air Canada

Find Deal

Wed, 29 Oct - Wed, 5 Nov

9:10 a.m. - 1:01 p.m.YUL-ORD

4h 51m1 stop

12:50 p.m. - 3:57 p.m.ORD-YUL

2h 07mdirect

C$ 344Air Canada

Find Deal

Wed, 29 Oct - Wed, 5 Nov

6:00 a.m. - 8:00 a.m.YUL-ORD

3h 00mdirect

5:55 p.m. - 9:17 p.m.ORD-YUL

2h 22mdirect

C$ 359United Airlines

Find Deal

Fri, 21 Nov - Sat, 29 Nov

9:45 a.m. - 11:23 a.m.YUL-ORD

2h 38mdirect

6:00 a.m. - 1:09 p.m.ORD-YUL

6h 09m1 stop

C$ 373United Airlines

Find Deal

Tue, 7 Oct - Sat, 11 Oct

3:52 p.m. - 5:52 p.m.YUL-ORD

3h 00mdirect

6:35 p.m. - 1:46 p.m.ORD-YUL

18h 11m1 stop

C$ 406American Airlines

Find Deal

Fri, 7 Nov - Mon, 10 Nov

3:52 p.m. - 5:52 p.m.YUL-ORD

3h 00mdirect

11:49 a.m. - 3:11 p.m.ORD-YUL

2h 22mdirect

C$ 421American Airlines

Find Deal

Thu, 6 Nov - Mon, 10 Nov

6:45 a.m. - 10:26 a.m.YUL-STL

28h 41m2 stops

1:55 p.m. - 12:43 a.m.STL-YUL

9h 48m2 stops

C$ 812WestJet

Find Deal

Wed, 5 Nov - Wed, 12 Nov

6:45 a.m. - 4:10 p.m.YUL-STL

10h 25m2 stops

1:55 p.m. - 12:43 a.m.STL-YUL

9h 48m2 stops

C$ 814WestJet

Find Deal

Wed, 5 Nov - Wed, 12 Nov

Air Canada flights from Montreal to Illinois

Our best Air Canada deals on Montreal to Illinois flight tickets

Air Canada

29 Oct

YUL6:15 p.m.Montreal Pierre Elliott Trudeau Intl

2h 45m

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

5 Nov

ORD7:15 a.m.Chicago O'Hare Intl

2h 05m

YUL10:20 a.m.Montreal Pierre Elliott Trudeau Intl

C$ 333

Find similar

Air Canada

29 Oct

YUL9:10 a.m.Montreal Pierre Elliott Trudeau Intl

4h 51m

1 stop

ORD1:01 p.m.Chicago O'Hare Intl

5 Nov

ORD12:50 p.m.Chicago O'Hare Intl

2h 07m

YUL3:57 p.m.Montreal Pierre Elliott Trudeau Intl

C$ 344

Find similar

Air Canada

29 Oct

YUL6:15 p.m.Montreal Pierre Elliott Trudeau Intl

2h 45m

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

5 Nov

ORD2:00 p.m.Chicago O'Hare Intl

5h 44m

2 stops

YUL8:44 p.m.Montreal Pierre Elliott Trudeau Intl

C$ 345

Find similar

United Airlines flights from Montreal to Illinois

Our best United Airlines deals on Montreal to Illinois flight tickets

United Airlines

21 Nov

YUL6:00 a.m.Montreal Pierre Elliott Trudeau Intl

3h 00m

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

29 Nov

ORD5:55 p.m.Chicago O'Hare Intl

2h 22m

YUL9:17 p.m.Montreal Pierre Elliott Trudeau Intl

C$ 359

Find similar

United Airlines

7 Oct

YUL9:45 a.m.Montreal Pierre Elliott Trudeau Intl

2h 38m

ORD11:23 a.m.Chicago O'Hare Intl

11 Oct

ORD6:00 a.m.Chicago O'Hare Intl

6h 09m

1 stop

YUL1:09 p.m.Montreal Pierre Elliott Trudeau Intl

C$ 373

Find similar

United Airlines

16 Oct

YUL2:20 p.m.Montreal Pierre Elliott Trudeau Intl

9h 55m

1 stop

ORD11:15 p.m.Chicago O'Hare Intl

19 Oct

ORD2:08 p.m.Chicago O'Hare Intl

2h 18m

YUL5:26 p.m.Montreal Pierre Elliott Trudeau Intl

C$ 384

Find similar

Fly from

Fly to

Route

Depart

Return

Price

MontrealChicago

YUL - MDW

YULMDW

Montreal Pierre Elliott Trudeau Intl

Fri 17/10

1:10 p.m.-4:24 p.m.

1 stop4h 14m

Chicago Midway

Mon 20/10

9:35 a.m.-4:00 p.m.

1 stop5h 25m

C$ 323

MontrealChicago

YUL - MDW

YULMDW

Montreal Pierre Elliott Trudeau Intl

Fri 17/10

1:10 p.m.-4:24 p.m.

1 stop4h 14m

Chicago Midway

Mon 20/10

9:35 a.m.-4:00 p.m.

1 stop5h 25m

C$ 325

MontrealChicago

YUL - ORD

YULORD

Montreal Pierre Elliott Trudeau Intl

Wed 29/10

6:15 p.m.-8:00 p.m.

Nonstop2h 45m

Chicago O'Hare Intl

Wed 5/11

7:15 a.m.-10:20 a.m.

Nonstop2h 05m

C$ 333

MontrealChicago

YUL - ORD

YULORD

Montreal Pierre Elliott Trudeau Intl

Wed 29/10

9:10 a.m.-1:01 p.m.

1 stop4h 51m

Chicago O'Hare Intl

Wed 5/11

12:50 p.m.-3:57 p.m.

Nonstop2h 07m

C$ 344

MontrealChicago

YUL - ORD

YULORD

Montreal Pierre Elliott Trudeau Intl

Fri 21/11

6:00 a.m.-8:00 a.m.

Nonstop3h 00m

Chicago O'Hare Intl

Sat 29/11

5:55 p.m.-9:17 p.m.

Nonstop2h 22m

C$ 359

MontrealChicago

YUL - ORD

YULORD

Montreal Pierre Elliott Trudeau Intl

Tue 7/10

9:45 a.m.-11:23 a.m.

Nonstop2h 38m

Chicago O'Hare Intl

Sat 11/10

6:00 a.m.-1:09 p.m.

1 stop6h 09m

C$ 373

MontrealChicago

YUL - ORD

YULORD

Montreal Pierre Elliott Trudeau Intl

Fri 7/11

3:52 p.m.-5:52 p.m.

Nonstop3h 00m

Chicago O'Hare Intl

Mon 10/11

6:35 p.m.-1:46 p.m.

1 stop18h 11m

C$ 406

MontrealChicago

YUL - ORD

YULORD

Montreal Pierre Elliott Trudeau Intl

Thu 6/11

3:52 p.m.-5:52 p.m.

Nonstop3h 00m

Chicago O'Hare Intl

Mon 10/11

11:49 a.m.-3:11 p.m.

Nonstop2h 22m

C$ 421

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Wed 5/11

6:45 a.m.-10:26 a.m.

2 stops28h 41m

Lambert-St Louis

Wed 12/11

1:55 p.m.-12:43 a.m.

2 stops9h 48m

C$ 812

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Wed 5/11

6:45 a.m.-4:10 p.m.

2 stops10h 25m

Lambert-St Louis

Wed 12/11

1:55 p.m.-12:43 a.m.

2 stops9h 48m

C$ 814

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 Montreal to Illinois

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 Illinois?

In general, March is the cheapest month to fly from Montreal to Illinois. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around C$ 398. If you don’t want to visit Illinois in March, then you should wait until June to fly from Montreal, when ticket prices are also cheap, with an average price of C$ 416.

What is the cheapest day to depart on your flight to Illinois?

According to our data, Friday is the cheapest day to fly to Illinois from Montreal. The lowest ticket price found for a Friday departure recently was C$ 754. Keep in mind that prices can always vary depending on your route and whether or not you are flying domestic or international. The most expensive day to fly to Illinois is Monday, with ticket prices averaging around C$ 992.

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

Our most recent data shows that the best time of day to fly to Illinois is in the afternoon. Flights from Montreal to Illinois during this time can be as low as C$ 767. If you have a flexible travel schedule, then try to avoid flying at noon when prices are C$ 1,009 on average. Flights to Illinois from Montreal at noon are generally more expensive because this time of day is more convenient for travellers’ schedules.

What is the cheapest Montreal to Illinois flight route?

Fly from Montreal Pierre Elliott Trudeau Intl to Chicago O'Hare Intl for the best Montreal - Illinois flight prices

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

You are more likely to see cheaper flights to Illinois from Montreal when booking weeks ahead of your departure date. In general, you can expect to find flights to Illinois for around C$ 528 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Illinois from Montreal for as low as C$ 290 on momondo.

What cabin class options are available on Montreal to Illinois flights?

There are 4 cabin classes available to choose from on Montreal to Illinois 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 Montreal to Illinois flights?

You could potentially save up to 12% on your flight if you consider stops on a Montreal to Illinois flight.

Cheap Montreal to Illinois flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Montreal to Illinois

Best price found	C$ 450
Fastest flight time	2h 31m
Direct flights	Every day
Airports in Illinois	2 airports

The best one-way flight to Illinois from Montreal in the past 72 hours is C$ 450. The best round-trip flight deal from Montreal to Illinois found on momondo in the last 72 hours is C$ 521.

The fastest flight from Montreal to Illinois takes 2h 31m

Direct flights go from Montreal to Illinois every day.

There are 2 airports near Illinois: Chicago O'Hare Intl (ORD), Lambert-St Louis (STL)

Search flight deals

When did momondo last update prices for flights from Montreal to Illinois?
Prices for flights from Montreal to Illinois are refreshed on a daily basis.
How many operators does momondo search for flights from Montreal to Illinois?
There are 5 operators available for flights from Montreal to Illinois as of September 2025.
How old do you have to be to fly from Montreal to Illinois?
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 Montreal to Illinois.
What documentation or ID do you need to fly to Illinois?
The travel and health documents required for your trip to Illinois 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 Illinois. 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 Montreal to Illinois?
momondo data reveals that the most frequently booked plane model on the route from Montreal to Illinois is Embraer 175 (Enhanced Winglets), representing 26.32% of all bookings. The subsequent popular models are Boeing 737 MAX 8 at 15.69%, Embraer 175 at 14.78%, and Airbus A321-100/200 at 10.78%.

Best airlines flying from Montreal to Illinois

Compare and see reviews for airlines that fly from Montreal to Illinois with momondo

Airline	Rating	Free Cancellation	Price
American Airlines	PriceFrom C$ 177	Free Cancellation	Rating 7.2 10,000 reviews	Search American Airlines flights
Porter Airlines	PriceFrom C$ 203	Free Cancellation	Rating 7.9 363 reviews	Search Porter Airlines flights
Air Canada	PriceFrom C$ 259	Free Cancellation	Rating 7.1 10,000 reviews	Search Air Canada flights
United Airlines	PriceFrom C$ 356	Free Cancellation	Rating 7.4 8,924 reviews	Search United Airlines flights
WestJet	PriceFrom C$ 452	Free Cancellation	Rating 7.2 3,093 reviews	Search WestJet flights

Why use momondo?

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

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 Illinois from Montreal.

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

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

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

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

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

If you are not ready to book a flight from Montreal to Illinois now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Illinois and let you know when they change.