What is the cheapest airline that flies from Lambert-St Louis to Montreal?

American Airlines is the most popular carrier operating from Lambert-St Louis to Montreal

How many flights depart from St. Louis to Montreal on average per week?

6 flights are operational weekly from St. Louis to Montreal as of October 2026. The most popular departure day for this route is Fri, with 50% of flights per week taking off on this day.

When did momondo last update prices for flights from Lambert-St Louis Airport to Montreal?

Prices for flights from Lambert-St Louis Airport to Montreal were last updated today.

How old do you have to be to fly from Lambert-St Louis Airport to Montreal?

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 Lambert-St Louis Airport to Montreal.

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

The necessary travel and health documents for your Montreal trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

C$ 252 Cheap Flights from St. Louis to Montreal in 2026/27

Find the cheapest flights from St. Louis to Montreal

Round-trip

One-way

Last minute

Cheap round-trip flights

Enter your travel dates to find the best prices.

8:15 p.m. - 11:30 a.m.STL Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl

14h 15m1 stop Chicago O'Hare Intl

12:10 p.m. - 10:31 p.m.YUL Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis

11h 21m1 stop Chicago O'Hare Intl

C$ 555American Airlines

Wed, 3 Feb - Sat, 6 Feb

7:21 a.m. - 9:31 p.m.STL Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl

13h 10m2 stops Chicago O'Hare Intl Philadelphia

12:10 p.m. - 10:31 p.m.YUL Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis

11h 21m1 stop Chicago O'Hare Intl

C$ 567American Airlines

Wed, 3 Feb - Sat, 6 Feb

7:21 a.m. - 9:31 p.m.STL Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl

13h 10m2 stops Chicago O'Hare Intl Philadelphia

1:00 p.m. - 11:57 p.m.YUL Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis

11h 57m2 stops Philadelphia Chicago O'Hare Intl

C$ 576American Airlines

Wed, 3 Feb - Sat, 6 Feb

8:24 p.m. - 11:28 a.m.STL Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl

14h 04m1 stop Chicago O'Hare Intl

12:08 p.m. - 7:58 p.m.YUL Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis

8h 50m1 stop Chicago O'Hare Intl

C$ 587American Airlines

Tue, 8 Dec - Tue, 15 Dec

11:37 a.m. - 10:48 p.m.STL Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl

10h 11m2 stops Chicago O'Hare Intl Philadelphia

12:08 p.m. - 12:02 a.m.YUL Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis

12h 54m1 stop Chicago O'Hare Intl

C$ 601American Airlines

Tue, 8 Dec - Tue, 15 Dec

11:37 a.m. - 10:48 p.m.STL Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl

10h 11m2 stops Chicago O'Hare Intl Philadelphia

1:04 p.m. - 12:02 a.m.YUL Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis

11h 58m2 stops Philadelphia Chicago O'Hare Intl

C$ 608American Airlines

Tue, 8 Dec - Tue, 15 Dec

8:15 p.m. - 11:30 a.m.STL Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl

14h 15m1 stop Chicago O'Hare Intl

12:10 p.m. - 11:57 p.m.YUL Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis

12h 47m1 stop Chicago O'Hare Intl

C$ 611American Airlines

Thu, 4 Feb - Sun, 7 Feb

8:15 p.m. - 11:30 a.m.STL Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl

14h 15m1 stop Chicago O'Hare Intl

1:00 p.m. - 11:57 p.m.YUL Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis

11h 57m2 stops Philadelphia Chicago O'Hare Intl

C$ 625American Airlines

Thu, 4 Feb - Sun, 7 Feb

5:23 p.m. - 11:28 a.m.STL Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl

17h 05m1 stop Chicago O'Hare Intl

12:08 p.m. - 7:57 p.m.YUL Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis

8h 49m1 stop Chicago O'Hare Intl

C$ 641American Airlines

Sat, 5 Dec - Sat, 12 Dec

5:29 p.m. - 11:25 a.m.STL Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl

16h 56m1 stop Chicago O'Hare Intl

1:04 p.m. - 11:59 p.m.YUL Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis

11h 55m2 stops Philadelphia Chicago O'Hare Intl

C$ 655American Airlines

Tue, 10 Nov - Mon, 16 Nov

Cheap last-minute flights

Enter your travel dates to find the best prices.

6:20 a.m. - 5:45 p.m.STL Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl

10h 25m1 stop Cancun

6:45 a.m. - 11:16 p.m.YUL Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis

17h 31m2 stops Toronto Pearson Intl Orlando

C$ 1,506Multiple Airlines

Tue, 27 Oct - Fri, 30 Oct

6:09 a.m. - 8:32 a.m.STL Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl

25h 23m1 stop Newark

6:50 p.m. - 9:03 a.m.YUL Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis

15h 13m1 stop Newark

C$ 1,507United Airlines

Tue, 27 Oct - Fri, 30 Oct

6:20 a.m. - 5:45 p.m.STL Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl

10h 25m1 stop Cancun

3:10 p.m. - 2:38 p.m.YUL Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis

24h 28m1 stop Cancun

C$ 1,548Multiple Airlines

Tue, 27 Oct - Fri, 30 Oct

8:30 a.m. - 5:07 p.m.STL Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl

7h 37m2 stops Chicago O'Hare Intl New York LaGuardia

6:50 p.m. - 10:44 a.m.YUL Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis

16h 54m1 stop Newark

C$ 1,661United Airlines

Tue, 27 Oct - Fri, 30 Oct

7:30 a.m. - 5:07 p.m.STL Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl

8h 37m2 stops Chicago O'Hare Intl Newark

1:10 p.m. - 10:00 p.m.YUL Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis

9h 50m1 stop Newark

C$ 1,738United Airlines

Tue, 27 Oct - Fri, 30 Oct

10:53 a.m. - 5:07 p.m.STL Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl

5h 14m1 stop Chicago O'Hare Intl

6:50 p.m. - 9:03 a.m.YUL Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis

15h 13m1 stop Newark

C$ 1,748United Airlines

Tue, 27 Oct - Fri, 30 Oct

6:09 a.m. - 5:07 p.m.STL Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl

9h 58m1 stop Newark

1:10 p.m. - 10:00 p.m.YUL Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis

9h 50m1 stop Newark

C$ 1,754United Airlines

Tue, 27 Oct - Fri, 30 Oct

6:27 a.m. - 4:52 p.m.STL Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl

9h 25m2 stops Charlotte Douglas Chicago O'Hare Intl

10:32 a.m. - 8:32 p.m.YUL Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis

11h 00m2 stops New York LaGuardia Washington, D.C. Reagan-National

C$ 1,766American Airlines

Tue, 27 Oct - Fri, 30 Oct

8:30 a.m. - 5:07 p.m.STL Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl

7h 37m2 stops Chicago O'Hare Intl New York LaGuardia

10:55 a.m. - 4:59 p.m.YUL Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis

7h 04m2 stops New York LaGuardia Chicago O'Hare Intl

C$ 1,780United Airlines

Tue, 27 Oct - Fri, 30 Oct

7:30 a.m. - 5:07 p.m.STL Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl

8h 37m2 stops Chicago O'Hare Intl Newark

10:55 a.m. - 4:59 p.m.YUL Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis

7h 04m2 stops New York LaGuardia Chicago O'Hare Intl

C$ 1,808United Airlines

Tue, 27 Oct - Fri, 30 Oct

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American Airlines flights from St. Louis to Montreal

Our best American Airlines deals on St. Louis to Montreal flight tickets

American Airlines

3 Feb

STL8:15 p.m.Lambert-St Louis

14h 15m

1 stop

YUL11:30 a.m.Montreal Pierre Elliott Trudeau Intl

6 Feb

YUL12:10 p.m.Montreal Pierre Elliott Trudeau Intl

11h 21m

1 stop

STL10:31 p.m.Lambert-St Louis

C$ 555

American Airlines

3 Feb

STL7:21 a.m.Lambert-St Louis

13h 10m

2 stops

YUL9:31 p.m.Montreal Pierre Elliott Trudeau Intl

6 Feb

YUL12:10 p.m.Montreal Pierre Elliott Trudeau Intl

11h 21m

1 stop

STL10:31 p.m.Lambert-St Louis

C$ 567

American Airlines

3 Feb

STL7:21 a.m.Lambert-St Louis

13h 10m

2 stops

YUL9:31 p.m.Montreal Pierre Elliott Trudeau Intl

6 Feb

YUL1:00 p.m.Montreal Pierre Elliott Trudeau Intl

11h 57m

2 stops

STL11:57 p.m.Lambert-St Louis

C$ 576

Delta flights from St. Louis to Montreal

Our best Delta deals on St. Louis to Montreal flight tickets

Delta

8 Apr

STL6:00 a.m.Lambert-St Louis

11h 50m

2 stops

YUL6:50 p.m.Montreal Pierre Elliott Trudeau Intl

13 Apr

YUL9:28 a.m.Montreal Pierre Elliott Trudeau Intl

12h 09m

2 stops

STL8:37 p.m.Lambert-St Louis

C$ 1,109

Delta

8 Nov

STL6:00 a.m.Lambert-St Louis

11h 58m

2 stops

YUL6:58 p.m.Montreal Pierre Elliott Trudeau Intl

10 Nov

YUL9:40 a.m.Montreal Pierre Elliott Trudeau Intl

11h 49m

2 stops

STL8:29 p.m.Lambert-St Louis

C$ 1,436

Delta

9 Nov

STL6:00 a.m.Lambert-St Louis

11h 58m

2 stops

YUL6:58 p.m.Montreal Pierre Elliott Trudeau Intl

13 Nov

YUL9:40 a.m.Montreal Pierre Elliott Trudeau Intl

8h 34m

2 stops

STL5:14 p.m.Lambert-St Louis

C$ 1,529

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

St. LouisMontreal

STL Lambert-St Louis - YUL Montreal Pierre Elliott Trudeau Intl

STLYUL

Lambert-St Louis

Wed 3/2

8:15 p.m.-11:30 a.m.

1 stop14h 15m

Montreal Pierre Elliott Trudeau Intl

Sat 6/2

12:10 p.m.-10:31 p.m.

1 stop11h 21m

C$ 555

St. LouisMontreal

STL Lambert-St Louis - YUL Montreal Pierre Elliott Trudeau Intl

STLYUL

Lambert-St Louis

Wed 3/2

7:21 a.m.-9:31 p.m.

2 stops13h 10m

Montreal Pierre Elliott Trudeau Intl

Sat 6/2

12:10 p.m.-10:31 p.m.

1 stop11h 21m

C$ 567

St. LouisMontreal

STL Lambert-St Louis - YUL Montreal Pierre Elliott Trudeau Intl

STLYUL

Lambert-St Louis

Wed 3/2

7:21 a.m.-9:31 p.m.

2 stops13h 10m

Montreal Pierre Elliott Trudeau Intl

Sat 6/2

1:00 p.m.-11:57 p.m.

2 stops11h 57m

C$ 576

St. LouisMontreal

STL Lambert-St Louis - YUL Montreal Pierre Elliott Trudeau Intl

STLYUL

Lambert-St Louis

Tue 8/12

8:24 p.m.-11:28 a.m.

1 stop14h 04m

Montreal Pierre Elliott Trudeau Intl

Tue 15/12

12:08 p.m.-7:58 p.m.

1 stop8h 50m

C$ 587

St. LouisMontreal

STL Lambert-St Louis - YUL Montreal Pierre Elliott Trudeau Intl

STLYUL

Lambert-St Louis

Tue 8/12

11:37 a.m.-10:48 p.m.

2 stops10h 11m

Montreal Pierre Elliott Trudeau Intl

Tue 15/12

12:08 p.m.-12:02 a.m.

1 stop12h 54m

C$ 601

Quickest round-trip

St. LouisMontreal

STL Lambert-St Louis - YUL Montreal Pierre Elliott Trudeau Intl

STLYUL

Lambert-St Louis

Tue 8/12

11:37 a.m.-10:48 p.m.

2 stops10h 11m

Montreal Pierre Elliott Trudeau Intl

Tue 15/12

1:04 p.m.-12:02 a.m.

2 stops11h 58m

C$ 608

St. LouisMontreal

STL Lambert-St Louis - YUL Montreal Pierre Elliott Trudeau Intl

STLYUL

Lambert-St Louis

Thu 4/2

8:15 p.m.-11:30 a.m.

1 stop14h 15m

Montreal Pierre Elliott Trudeau Intl

Sun 7/2

12:10 p.m.-11:57 p.m.

1 stop12h 47m

C$ 611

St. LouisMontreal

STL Lambert-St Louis - YUL Montreal Pierre Elliott Trudeau Intl

STLYUL

Lambert-St Louis

Thu 4/2

8:15 p.m.-11:30 a.m.

1 stop14h 15m

Montreal Pierre Elliott Trudeau Intl

Sun 7/2

1:00 p.m.-11:57 p.m.

2 stops11h 57m

C$ 625

St. LouisMontreal

STL Lambert-St Louis - YUL Montreal Pierre Elliott Trudeau Intl

STLYUL

Lambert-St Louis

Sat 5/12

5:23 p.m.-11:28 a.m.

1 stop17h 05m

Montreal Pierre Elliott Trudeau Intl

Sat 12/12

12:08 p.m.-7:57 p.m.

1 stop8h 49m

C$ 641

St. LouisMontreal

STL Lambert-St Louis - YUL Montreal Pierre Elliott Trudeau Intl

STLYUL

Lambert-St Louis

Tue 10/11

5:29 p.m.-11:25 a.m.

1 stop16h 56m

Montreal Pierre Elliott Trudeau Intl

Mon 16/11

1:04 p.m.-11:59 p.m.

2 stops11h 55m

C$ 655

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 St. Louis to Montreal

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 typical price of a round-trip flight between St. Louis and Montreal?

Prices are currently low for flights on this route.

Typical prices usually range from C$ 1,236 to C$ 1,343.
The lowest price recently found on this route was C$ 555.

What is the cheapest month to fly to Montreal?

The cheapest month to fly to Montreal from St. Louis is in August. Flight prices, which tend to average around C$ 640, are often lower during this time because this is during the off-season. If you aren’t able to travel during the month of August, then book flights to Montreal from St. Louis during February instead. Flights to Montreal in February, while not as cheap as those in August, still average around C$ 709.

What is the cheapest Lambert-St Louis to Montreal flight route?

Fly from Lambert-St Louis to Montreal Pierre Elliott Trudeau Intl for the best Lambert-St Louis - Montreal flight prices

What cabin class options are available on St. Louis to Montreal flights?

There is only 1 cabin class available to choose from on St. Louis to Montreal flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

When to book flights from St. Louis to Montreal

Are you open to changing your travel dates? Check out the ideal times to fly from St. Louis to Montreal according to our flight data. Find out which month and days have the cheapest flights.

Estimated round-trip price

Cheap St. Louis to Montreal (STL to YMQ) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to Montreal

Best price found	C$ 252
Fastest flight time	7h 00m
Direct flights	None

The best one-way flight to Montreal from St. Louis in the past 72 hours is C$ 252. The best round-trip flight deal from St. Louis to Montreal found on momondo in the last 72 hours is C$ 555.

The fastest flight from St. Louis to Montreal takes 7h 00m

There are no direct flights from St. Louis to Montreal. There are no popular flight routes from St. Louis to Montreal.

Search flight deals

Frequently asked questions about flying from St. Louis to Montreal

How far is Lambert-St Louis to Montreal by plane?
The straight-line distance from Lambert-St Louis to Montreal is 1566.0 km. Flights usually cover this in 7h 00m, depending on flying conditions and air traffic around both airports.
When did momondo last update prices for flights from Lambert-St Louis Airport to Montreal?
Prices for flights from Lambert-St Louis Airport to Montreal were last updated today.
How old do you have to be to fly from Lambert-St Louis Airport to Montreal?
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 Lambert-St Louis Airport to Montreal.
What documentation or ID do you need to fly to Montreal?
The necessary travel and health documents for your Montreal trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.
What is the most popular plane model from St. Louis to Montreal?
momondo data reveals that the most frequently booked plane model on the route from St. Louis to Montreal is Canadair (Bombardier) Regional Jet 900, representing 54.90% of all bookings. The subsequent popular models are Boeing 787-8 Dreamliner at 21.57%, Embraer 175 at 11.76%, and Airbus A330-300 at 5.88%.

Why use momondo?

Why should I use momondo to find a flight deal from St. Louis to Montreal?

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 Montreal from St. Louis.

Can I find flights from St. Louis to Montreal with flexible booking policies on momondo?

Yes. momondo enables you to select and highlight flights to Montreal from St. Louis with this policy.

How can momondo help me find flights from St. Louis to Montreal?

Once you have performed a search for St. Louis to Montreal 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 St. Louis to Montreal right now. Can momondo alert me if prices change?

Yes momondo offers price alerts on flights to Montreal from St. Louis. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

An easier way to manage your Montreal trip

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Complete your trip

Feeling lucky

Fly into one of these airports located in Montreal

MET - Montreal Metropolitan Airport

Montreal Pierre Elliott Trudeau Intl Airport

Cheap flights from St. Louis to Montreal from C$ 252

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to Montreal departing on 13/11. 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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American Airlines flights from St. Louis to Montreal

Our best American Airlines deals on St. Louis to Montreal flight tickets

Delta flights from St. Louis to Montreal

Our best Delta deals on St. Louis to Montreal flight tickets

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See travel insights to Montreal from

How to get the cheapest flight ticket from St. Louis to Montreal

What is the typical price of a round-trip flight between St. Louis and Montreal?

What is the cheapest month to fly to Montreal?

What is the cheapest Lambert-St Louis to Montreal flight route?

What cabin class options are available on St. Louis to Montreal flights?

What is the cheapest airline that flies from Lambert-St Louis to Montreal?

How many flights depart from St. Louis to Montreal on average per week?

When to book flights from St. Louis to Montreal

Cheap St. Louis to Montreal (STL to YMQ) flight deals and tips

Best price found

Fastest flight time

Direct flights

Frequently asked questions about flying from St. Louis to Montreal

Why use momondo?

An easier way to manage your Montreal 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 Canada

Fly into one of these airports located in Montreal

Airports listed have a maximum distance of 15.1 km from Montreal

Cabin classes currently available on flights to Montreal

List of cabin classes available on flights landing in Montreal. Availability may vary depending on flight origin and airline.

Popular Cities in Canada

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

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According to popular flight searches on momondo this year

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