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Cheap flights from St. Louis to Montreal from C$ 220

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 7/10. 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

Logo
10:57 a.m. - 2:50 p.m.STL-YUL
26h 53m1 stop
Logo
6:35 p.m. - 10:37 a.m.YUL-STL
17h 02m2 stops
C$ 533
Find Deal
Thu, 9 Oct - Wed, 15 Oct
Logo
9:45 a.m. - 12:30 a.m.STL-YUL
13h 45m1 stop
Logo
5:25 p.m. - 11:01 a.m.YUL-STL
18h 36m2 stops
C$ 559
Find Deal
Fri, 5 Dec - Sat, 6 Dec
American Airlines Logo
7:58 p.m. - 3:11 p.m.STL-YUL
18h 13m1 stop
American Airlines Logo
3:52 p.m. - 8:09 a.m.YUL-STL
17h 17m1 stop
C$ 565American Airlines
Find Deal
Thu, 6 Nov - Sun, 9 Nov
American Airlines Logo
8:04 p.m. - 11:40 a.m.STL-YUL
14h 36m1 stop
American Airlines Logo
7:30 a.m. - 8:23 p.m.YUL-STL
13h 53m2 stops
C$ 579American Airlines
Find Deal
Tue, 21 Oct - Wed, 12 Nov
Logo
10:57 a.m. - 2:50 p.m.STL-YUL
26h 53m1 stop
Logo
7:20 p.m. - 10:37 a.m.YUL-STL
16h 17m2 stops
C$ 583
Find Deal
Thu, 9 Oct - Sat, 11 Oct
American Airlines Logo
6:00 a.m. - 10:39 p.m.STL-YUL
15h 39m2 stops
American Airlines Logo
7:30 a.m. - 8:23 p.m.YUL-STL
13h 53m2 stops
C$ 585American Airlines
Find Deal
Tue, 4 Nov - Tue, 18 Nov
United Airlines Logo
5:28 p.m. - 6:42 p.m.STL-YUL
24h 14m1 stop
United Airlines Logo
8:20 a.m. - 10:35 p.m.YUL-STL
15h 15m1 stop
C$ 723United Airlines
Find Deal
Thu, 16 Oct - Sat, 18 Oct
Delta Logo
9:31 a.m. - 6:40 p.m.STL-YUL
8h 09m1 stop
Delta Logo
9:26 a.m. - 8:46 p.m.YUL-STL
12h 20m2 stops
C$ 729Delta
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Tue, 4 Nov - Tue, 18 Nov
United Airlines Logo
9:20 a.m. - 9:54 p.m.STL-YUL
11h 34m2 stops
United Airlines Logo
1:20 p.m. - 10:35 p.m.YUL-STL
10h 15m1 stop
C$ 735United Airlines
Find Deal
Tue, 7 Oct - Sat, 11 Oct
Delta Logo
5:40 p.m. - 8:37 a.m.STL-YUL
13h 57m1 stop
Delta Logo
9:28 a.m. - 8:08 p.m.YUL-STL
11h 40m1 stop
C$ 782Delta
Find Deal
Tue, 7 Oct - Tue, 14 Oct

American Airlines flights from St. Louis to Montreal

Our best American Airlines deals on St. Louis to Montreal flight tickets
American Airlines
6 Nov
STL7:58 p.m.Lambert-St Louis
18h 13m
1 stop
YUL3:11 p.m.Montreal Pierre Elliott Trudeau Intl
9 Nov
YUL3:52 p.m.Montreal Pierre Elliott Trudeau Intl
17h 17m
1 stop
STL8:09 a.m.Lambert-St Louis
C$ 565
Find similar
American Airlines
21 Oct
STL8:04 p.m.Lambert-St Louis
14h 36m
1 stop
YUL11:40 a.m.Montreal Pierre Elliott Trudeau Intl
12 Nov
YUL7:30 a.m.Montreal Pierre Elliott Trudeau Intl
13h 53m
2 stops
STL8:23 p.m.Lambert-St Louis
C$ 579
Find similar
American Airlines
4 Nov
STL6:00 a.m.Lambert-St Louis
15h 39m
2 stops
YUL10:39 p.m.Montreal Pierre Elliott Trudeau Intl
18 Nov
YUL7:30 a.m.Montreal Pierre Elliott Trudeau Intl
13h 53m
2 stops
STL8:23 p.m.Lambert-St Louis
C$ 585
Find similar

United Airlines flights from St. Louis to Montreal

Our best United Airlines deals on St. Louis to Montreal flight tickets
United Airlines
16 Oct
STL5:28 p.m.Lambert-St Louis
24h 14m
1 stop
YUL6:42 p.m.Montreal Pierre Elliott Trudeau Intl
18 Oct
YUL8:20 a.m.Montreal Pierre Elliott Trudeau Intl
15h 15m
1 stop
STL10:35 p.m.Lambert-St Louis
C$ 723
Find similar
United Airlines
7 Oct
STL9:20 a.m.Lambert-St Louis
11h 34m
2 stops
YUL9:54 p.m.Montreal Pierre Elliott Trudeau Intl
11 Oct
YUL1:20 p.m.Montreal Pierre Elliott Trudeau Intl
10h 15m
1 stop
STL10:35 p.m.Lambert-St Louis
C$ 735
Find similar
United Airlines
6 Dec
STL6:42 p.m.Lambert-St Louis
20h 15m
1 stop
YUL3:57 p.m.Montreal Pierre Elliott Trudeau Intl
8 Dec
YUL6:15 p.m.Montreal Pierre Elliott Trudeau Intl
22h 25m
1 stop
STL3:40 p.m.Lambert-St Louis
C$ 764
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 15 September 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

Thu 9/10

10:57 a.m.-2:50 p.m.

1 stop26h 53m

Montreal Pierre Elliott Trudeau Intl

Wed 15/10

6:35 p.m.-10:37 a.m.

2 stops17h 02m

C$ 533

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Fri 5/12

9:45 a.m.-12:30 a.m.

1 stop13h 45m

Montreal Pierre Elliott Trudeau Intl

Sat 6/12

5:25 p.m.-11:01 a.m.

2 stops18h 36m

C$ 559

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 6/11

7:58 p.m.-3:11 p.m.

1 stop18h 13m

Montreal Pierre Elliott Trudeau Intl

Sun 9/11

3:52 p.m.-8:09 a.m.

1 stop17h 17m

C$ 565

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 21/10

8:04 p.m.-11:40 a.m.

1 stop14h 36m

Montreal Pierre Elliott Trudeau Intl

Wed 12/11

7:30 a.m.-8:23 p.m.

2 stops13h 53m

C$ 579

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 9/10

10:57 a.m.-2:50 p.m.

1 stop26h 53m

Montreal Pierre Elliott Trudeau Intl

Sat 11/10

7:20 p.m.-10:37 a.m.

2 stops16h 17m

C$ 583

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 4/11

6:00 a.m.-10:39 p.m.

2 stops15h 39m

Montreal Pierre Elliott Trudeau Intl

Tue 18/11

7:30 a.m.-8:23 p.m.

2 stops13h 53m

C$ 585

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 16/10

5:28 p.m.-6:42 p.m.

1 stop24h 14m

Montreal Pierre Elliott Trudeau Intl

Sat 18/10

8:20 a.m.-10:35 p.m.

1 stop15h 15m

C$ 723

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 4/11

9:31 a.m.-6:40 p.m.

1 stop8h 09m

Montreal Pierre Elliott Trudeau Intl

Tue 18/11

9:26 a.m.-8:46 p.m.

2 stops12h 20m

C$ 729

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 7/10

9:20 a.m.-9:54 p.m.

2 stops11h 34m

Montreal Pierre Elliott Trudeau Intl

Sat 11/10

1:20 p.m.-10:35 p.m.

1 stop10h 15m

C$ 735

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 7/10

5:40 p.m.-8:37 a.m.

1 stop13h 57m

Montreal Pierre Elliott Trudeau Intl

Tue 14/10

9:28 a.m.-8:08 p.m.

1 stop11h 40m

C$ 782

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$ 442, 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$ 639.

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 60% 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

Fastest flight time

2h 30m

Direct flights

Every day

Airports in Montreal

1 airport
The fastest flight from St. Louis to Montreal takes 2h 30m
Direct flights go from St. Louis to Montreal every day.
There is 1 airport near Montreal: Montreal Pierre Elliott Trudeau Intl (YUL)
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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 54m, 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