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Cheap flights from St. Louis to Montreal from C$ 173

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 20/4. 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
5:51 a.m. - 11:44 a.m.
STL
-
YUL
4h 53m
1 stop
American Airlines Logo
2:32 p.m. - 8:30 a.m.
YUL
-
STL
18h 58m
1 stop
C$ 314American Airlines
Wed, 8 Apr - Wed, 15 Apr
American Airlines Logo
8:00 a.m. - 2:58 p.m.
STL
-
YUL
5h 58m
1 stop
American Airlines Logo
7:29 a.m. - 1:22 p.m.
YUL
-
STL
6h 53m
1 stop
C$ 326American Airlines
Sun, 5 Apr - Sun, 12 Apr
American Airlines Logo
4:30 p.m. - 11:44 a.m.
STL
-
YUL
18h 14m
1 stop
American Airlines Logo
12:30 p.m. - 10:17 p.m.
YUL
-
STL
10h 47m
1 stop
C$ 421American Airlines
Tue, 21 Apr - Mon, 27 Apr
American Airlines Logo
6:29 a.m. - 9:37 p.m.
STL
-
YUL
14h 08m
1 stop
American Airlines Logo
12:30 p.m. - 10:17 p.m.
YUL
-
STL
10h 47m
1 stop
C$ 466American Airlines
Sat, 11 Apr - Mon, 13 Apr
American Airlines Logo
6:33 p.m. - 11:44 a.m.
STL
-
YUL
16h 11m
1 stop
American Airlines Logo
12:30 p.m. - 11:46 p.m.
YUL
-
STL
12h 16m
1 stop
C$ 488American Airlines
Mon, 6 Apr - Mon, 13 Apr
American Airlines Logo
5:51 a.m. - 10:58 p.m.
STL
-
YUL
16h 07m
2 stops
American Airlines Logo
12:30 p.m. - 11:46 p.m.
YUL
-
STL
12h 16m
1 stop
C$ 508American Airlines
Tue, 21 Apr - Sun, 26 Apr
American Airlines Logo
6:00 a.m. - 2:58 p.m.
STL
-
YUL
7h 58m
1 stop
American Airlines Logo
7:30 a.m. - 10:52 p.m.
YUL
-
STL
16h 22m
1 stop
C$ 525American Airlines
Sun, 29 Mar - Sat, 4 Apr
Air Canada Logo
9:10 a.m. - 6:55 p.m.
STL
-
YUL
8h 45m
1 stop
Air Canada Logo
6:10 a.m. - 9:08 p.m.
YUL
-
STL
15h 58m
1 stop
C$ 573Air Canada
Tue, 7 Apr - Tue, 14 Apr
United Airlines Logo
9:10 a.m. - 6:55 p.m.
STL
-
YUL
8h 45m
1 stop
United Airlines Logo
9:45 a.m. - 9:08 p.m.
YUL
-
STL
12h 23m
1 stop
C$ 581United Airlines
Thu, 23 Apr - Wed, 29 Apr
Multiple Airlines Logo
4:59 p.m. - 12:30 a.m.
STL
-
YUL
30h 31m
1 stop
Multiple Airlines Logo
4:25 p.m. - 6:50 a.m.
YUL
-
STL
39h 25m
2 stops
C$ 582Multiple Airlines
Wed, 22 Apr - Thu, 30 Apr

American Airlines flights from St. Louis to Montreal

Our best American Airlines deals on St. Louis to Montreal flight tickets
American Airlines
8 Apr
STL5:51 a.m.Lambert-St Louis
4h 53m
1 stop
YUL11:44 a.m.Montreal Pierre Elliott Trudeau Intl
15 Apr
YUL2:32 p.m.Montreal Pierre Elliott Trudeau Intl
18h 58m
1 stop
STL8:30 a.m.Lambert-St Louis
C$ 314
American Airlines
5 Apr
STL8:00 a.m.Lambert-St Louis
5h 58m
1 stop
YUL2:58 p.m.Montreal Pierre Elliott Trudeau Intl
12 Apr
YUL7:29 a.m.Montreal Pierre Elliott Trudeau Intl
6h 53m
1 stop
STL1:22 p.m.Lambert-St Louis
C$ 326
American Airlines
21 Apr
STL4:30 p.m.Lambert-St Louis
18h 14m
1 stop
YUL11:44 a.m.Montreal Pierre Elliott Trudeau Intl
27 Apr
YUL12:30 p.m.Montreal Pierre Elliott Trudeau Intl
10h 47m
1 stop
STL10:17 p.m.Lambert-St Louis
C$ 421

United Airlines flights from St. Louis to Montreal

Our best United Airlines deals on St. Louis to Montreal flight tickets
United Airlines
23 Apr
STL9:10 a.m.Lambert-St Louis
8h 45m
1 stop
YUL6:55 p.m.Montreal Pierre Elliott Trudeau Intl
29 Apr
YUL9:45 a.m.Montreal Pierre Elliott Trudeau Intl
12h 23m
1 stop
STL9:08 p.m.Lambert-St Louis
C$ 581
United Airlines
24 Apr
STL7:45 a.m.Lambert-St Louis
25h 55m
1 stop
YUL10:40 a.m.Montreal Pierre Elliott Trudeau Intl
27 Apr
YUL1:20 p.m.Montreal Pierre Elliott Trudeau Intl
20h 05m
1 stop
STL8:25 a.m.Lambert-St Louis
C$ 588
United Airlines
23 Apr
STL9:10 a.m.Lambert-St Louis
8h 45m
1 stop
YUL6:55 p.m.Montreal Pierre Elliott Trudeau Intl
26 Apr
YUL6:10 a.m.Montreal Pierre Elliott Trudeau Intl
15h 58m
1 stop
STL9:08 p.m.Lambert-St Louis
C$ 602

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 25 February 2026.
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

Wed 8/4

5:51 a.m.-11:44 a.m.

1 stop4h 53m

Montreal Pierre Elliott Trudeau Intl

Wed 15/4

2:32 p.m.-8:30 a.m.

1 stop18h 58m

C$ 314

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sun 5/4

8:00 a.m.-2:58 p.m.

1 stop5h 58m

Montreal Pierre Elliott Trudeau Intl

Sun 12/4

7:29 a.m.-1:22 p.m.

1 stop6h 53m

C$ 326

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 21/4

4:30 p.m.-11:44 a.m.

1 stop18h 14m

Montreal Pierre Elliott Trudeau Intl

Mon 27/4

12:30 p.m.-10:17 p.m.

1 stop10h 47m

C$ 421

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sat 11/4

6:29 a.m.-9:37 p.m.

1 stop14h 08m

Montreal Pierre Elliott Trudeau Intl

Mon 13/4

12:30 p.m.-10:17 p.m.

1 stop10h 47m

C$ 466

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 6/4

6:33 p.m.-11:44 a.m.

1 stop16h 11m

Montreal Pierre Elliott Trudeau Intl

Mon 13/4

12:30 p.m.-11:46 p.m.

1 stop12h 16m

C$ 488

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 21/4

5:51 a.m.-10:58 p.m.

2 stops16h 07m

Montreal Pierre Elliott Trudeau Intl

Sun 26/4

12:30 p.m.-11:46 p.m.

1 stop12h 16m

C$ 508

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sun 29/3

6:00 a.m.-2:58 p.m.

1 stop7h 58m

Montreal Pierre Elliott Trudeau Intl

Sat 4/4

7:30 a.m.-10:52 p.m.

1 stop16h 22m

C$ 525

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 7/4

9:10 a.m.-6:55 p.m.

1 stop8h 45m

Montreal Pierre Elliott Trudeau Intl

Tue 14/4

6:10 a.m.-9:08 p.m.

1 stop15h 58m

C$ 573

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 23/4

9:10 a.m.-6:55 p.m.

1 stop8h 45m

Montreal Pierre Elliott Trudeau Intl

Wed 29/4

9:45 a.m.-9:08 p.m.

1 stop12h 23m

C$ 581

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Wed 22/4

4:59 p.m.-12:30 a.m.

1 stop30h 31m

Montreal Pierre Elliott Trudeau Intl

Thu 30/4

4:25 p.m.-6:50 a.m.

2 stops39h 25m

C$ 582

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest 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 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 42% 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 32m

Direct flights

Every day

Airports in Montreal

2 airports
The fastest flight from St. Louis to Montreal takes 2h 32m
Direct flights go from St. Louis to Montreal every day.
There are 2 airports in Montreal. From St. Louis there are direct flights to Montreal Pierre Elliott Trudeau Intl (YUL).
Search flight deals

  • 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 2h 32m, 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