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Cheap flights from St. Louis to Montreal from C$ 227

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 6/11. 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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Find the cheapest flights from St. Louis to Montreal

Cheap round-trip flights

Enter your travel dates to find the best prices.
American Airlines Logo
6:04 a.m. - 3:00 p.m.STL-YUL
7h 56m1 stop
American Airlines Logo
3:45 p.m. - 9:27 a.m.YUL-STL
18h 42m1 stop
C$ 382American Airlines
Find Deal
Tue, 17 Feb - Thu, 19 Feb
American Airlines Logo
6:04 a.m. - 3:00 p.m.STL-YUL
7h 56m1 stop
American Airlines Logo
10:05 a.m. - 9:44 p.m.YUL-STL
12h 39m2 stops
C$ 396American Airlines
Find Deal
Tue, 17 Feb - Thu, 19 Feb
American Airlines Logo
6:00 a.m. - 3:07 p.m.STL-YUL
8h 07m1 stop
American Airlines Logo
7:30 a.m. - 6:16 p.m.YUL-STL
11h 46m2 stops
C$ 406American Airlines
Find Deal
Mon, 12 Jan - Tue, 13 Jan
United Airlines Logo
8:21 a.m. - 9:01 p.m.STL-YUL
11h 40m1 stop
United Airlines Logo
9:25 a.m. - 9:00 p.m.YUL-STL
12h 35m1 stop
C$ 534United Airlines
Find Deal
Sat, 14 Feb - Sun, 15 Feb
United Airlines Logo
8:05 a.m. - 9:17 p.m.STL-YUL
12h 12m1 stop
United Airlines Logo
6:30 a.m. - 10:00 p.m.YUL-STL
16h 30m1 stop
C$ 538United Airlines
Find Deal
Tue, 10 Feb - Sat, 14 Feb
United Airlines Logo
6:30 a.m. - 4:01 p.m.STL-YUL
8h 31m1 stop
United Airlines Logo
6:00 a.m. - 2:30 p.m.YUL-STL
9h 30m1 stop
C$ 542United Airlines
Find Deal
Tue, 13 Jan - Thu, 15 Jan
United Airlines Logo
6:30 a.m. - 9:16 p.m.STL-YUL
13h 46m2 stops
United Airlines Logo
6:30 a.m. - 9:00 p.m.YUL-STL
15h 30m1 stop
C$ 552United Airlines
Find Deal
Wed, 11 Feb - Sun, 15 Feb
Multiple Airlines Logo
2:57 p.m. - 4:23 p.m.STL-YUL
24h 26m1 stop
Multiple Airlines Logo
8:00 a.m. - 10:33 p.m.YUL-STL
15h 33m2 stops
C$ 574Multiple Airlines
Find Deal
Thu, 4 Dec - Mon, 8 Dec
United Airlines Logo
9:57 a.m. - 6:40 p.m.STL-YUL
7h 43m1 stop
United Airlines Logo
1:10 p.m. - 9:00 p.m.YUL-STL
8h 50m1 stop
C$ 580United Airlines
Find Deal
Mon, 9 Feb - Sat, 14 Feb
American Airlines Logo
5:05 a.m. - 3:10 p.m.STL-YUL
9h 05m1 stop
American Airlines Logo
3:50 p.m. - 8:08 a.m.YUL-STL
17h 18m1 stop
C$ 602American Airlines
Find Deal
Wed, 3 Dec - Sun, 7 Dec

United Airlines flights from St. Louis to Montreal

Our best United Airlines deals on St. Louis to Montreal flight tickets
United Airlines
14 Feb
STL8:21 a.m.Lambert-St Louis
11h 40m
1 stop
YUL9:01 p.m.Montreal Pierre Elliott Trudeau Intl
15 Feb
YUL9:25 a.m.Montreal Pierre Elliott Trudeau Intl
12h 35m
1 stop
STL9:00 p.m.Lambert-St Louis
C$ 534
Find similar
United Airlines
10 Feb
STL8:05 a.m.Lambert-St Louis
12h 12m
1 stop
YUL9:17 p.m.Montreal Pierre Elliott Trudeau Intl
14 Feb
YUL6:30 a.m.Montreal Pierre Elliott Trudeau Intl
16h 30m
1 stop
STL10:00 p.m.Lambert-St Louis
C$ 538
Find similar
United Airlines
13 Jan
STL6:30 a.m.Lambert-St Louis
8h 31m
1 stop
YUL4:01 p.m.Montreal Pierre Elliott Trudeau Intl
15 Jan
YUL6:00 a.m.Montreal Pierre Elliott Trudeau Intl
9h 30m
1 stop
STL2:30 p.m.Lambert-St Louis
C$ 542
Find similar

American Airlines flights from St. Louis to Montreal

Our best American Airlines deals on St. Louis to Montreal flight tickets
American Airlines
17 Feb
STL6:04 a.m.Lambert-St Louis
7h 56m
1 stop
YUL3:00 p.m.Montreal Pierre Elliott Trudeau Intl
19 Feb
YUL3:45 p.m.Montreal Pierre Elliott Trudeau Intl
18h 42m
1 stop
STL9:27 a.m.Lambert-St Louis
C$ 382
Find similar
American Airlines
17 Feb
STL6:04 a.m.Lambert-St Louis
7h 56m
1 stop
YUL3:00 p.m.Montreal Pierre Elliott Trudeau Intl
19 Feb
YUL10:05 a.m.Montreal Pierre Elliott Trudeau Intl
12h 39m
2 stops
STL9:44 p.m.Lambert-St Louis
C$ 396
Find similar
American Airlines
12 Jan
STL6:00 a.m.Lambert-St Louis
8h 07m
1 stop
YUL3:07 p.m.Montreal Pierre Elliott Trudeau Intl
13 Jan
YUL7:30 a.m.Montreal Pierre Elliott Trudeau Intl
11h 46m
2 stops
STL6:16 p.m.Lambert-St Louis
C$ 406
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from St. Louis to Montreal 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 96,600 searches. Data last updated 16 October 2025.
Use the filters below to find and compare flights from St. Louis to Montreal that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 17/2

6:04 a.m.-3:00 p.m.

1 stop7h 56m

Montreal Pierre Elliott Trudeau Intl

Thu 19/2

3:45 p.m.-9:27 a.m.

1 stop18h 42m

C$ 382

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 17/2

6:04 a.m.-3:00 p.m.

1 stop7h 56m

Montreal Pierre Elliott Trudeau Intl

Thu 19/2

10:05 a.m.-9:44 p.m.

2 stops12h 39m

C$ 396

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 12/1

6:00 a.m.-3:07 p.m.

1 stop8h 07m

Montreal Pierre Elliott Trudeau Intl

Tue 13/1

7:30 a.m.-6:16 p.m.

2 stops11h 46m

C$ 406

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sat 14/2

8:21 a.m.-9:01 p.m.

1 stop11h 40m

Montreal Pierre Elliott Trudeau Intl

Sun 15/2

9:25 a.m.-9:00 p.m.

1 stop12h 35m

C$ 534

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 10/2

8:05 a.m.-9:17 p.m.

1 stop12h 12m

Montreal Pierre Elliott Trudeau Intl

Sat 14/2

6:30 a.m.-10:00 p.m.

1 stop16h 30m

C$ 538

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 13/1

6:30 a.m.-4:01 p.m.

1 stop8h 31m

Montreal Pierre Elliott Trudeau Intl

Thu 15/1

6:00 a.m.-2:30 p.m.

1 stop9h 30m

C$ 542

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Wed 11/2

6:30 a.m.-9:16 p.m.

2 stops13h 46m

Montreal Pierre Elliott Trudeau Intl

Sun 15/2

6:30 a.m.-9:00 p.m.

1 stop15h 30m

C$ 552

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 4/12

2:57 p.m.-4:23 p.m.

1 stop24h 26m

Montreal Pierre Elliott Trudeau Intl

Mon 8/12

8:00 a.m.-10:33 p.m.

2 stops15h 33m

C$ 574

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 9/2

9:57 a.m.-6:40 p.m.

1 stop7h 43m

Montreal Pierre Elliott Trudeau Intl

Sat 14/2

1:10 p.m.-9:00 p.m.

1 stop8h 50m

C$ 580

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Wed 3/12

5:05 a.m.-3:10 p.m.

1 stop9h 05m

Montreal Pierre Elliott Trudeau Intl

Sun 7/12

3:50 p.m.-8:08 a.m.

1 stop17h 18m

C$ 602

Flights are sorted by cheapest round-trip flights first.

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See travel insights to Montreal from

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

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

What is the cheapest month to fly to Montreal?

The cheapest month to fly to Montreal from St. Louis is in June. Flight prices, which tend to average around C$ 402, are often lower during this time because this is during the off-season. If you aren’t able to travel during the month of June, then book flights to Montreal from St. Louis during August instead. Flights to Montreal in August, while not as cheap as those in June, still average around C$ 649.

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 Lambert-St Louis to Montreal flights?

There is only 1 cabin class available to choose from on Lambert-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.

Can stopping save me money on St. Louis to Montreal flights?

You could potentially save up to 39% on your flight if you consider stops on a St. Louis to Montreal flight.

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

Direct flights

None
There are no direct flights from St. Louis to Montreal. There are no popular flight routes from St. Louis to Montreal.
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  • 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 17m, 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?

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.

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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
Montreal St Hubert Airport
Montreal Pierre Elliott Trudeau Intl Airport