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Cheap flights from St. Louis to Montreal from C$ 172

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 28/3. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult

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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
8:03 p.m. - 11:44 a.m.
STL
-
YUL
14h 41m
1 stop
American Airlines Logo
12:30 p.m. - 10:19 p.m.
YUL
-
STL
10h 49m
1 stop
C$ 467American Airlines
Tue, 5 May - Sat, 9 May
American Airlines Logo
5:21 p.m. - 11:44 a.m.
STL
-
YUL
17h 23m
1 stop
American Airlines Logo
1:03 p.m. - 11:56 p.m.
YUL
-
STL
11h 53m
2 stops
C$ 481American Airlines
Tue, 5 May - Sat, 9 May
American Airlines Logo
8:03 p.m. - 11:44 a.m.
STL
-
YUL
14h 41m
1 stop
American Airlines Logo
12:30 p.m. - 11:46 p.m.
YUL
-
STL
12h 16m
1 stop
C$ 581American Airlines
Wed, 22 Apr - Sun, 26 Apr
American Airlines Logo
6:29 a.m. - 12:18 p.m.
STL
-
YUL
4h 49m
1 stop
American Airlines Logo
12:30 p.m. - 11:46 p.m.
YUL
-
STL
12h 16m
1 stop
C$ 630American Airlines
Thu, 16 Apr - Mon, 20 Apr
American Airlines Logo
6:33 p.m. - 2:58 p.m.
STL
-
YUL
19h 25m
1 stop
American Airlines Logo
7:30 a.m. - 12:44 p.m.
YUL
-
STL
6h 14m
1 stop
C$ 632American Airlines
Mon, 30 Mar - Mon, 6 Apr
American Airlines Logo
8:03 p.m. - 11:44 a.m.
STL
-
YUL
14h 41m
1 stop
American Airlines Logo
12:30 p.m. - 11:46 p.m.
YUL
-
STL
12h 16m
1 stop
C$ 696American Airlines
Mon, 13 Apr - Thu, 16 Apr
United Airlines Logo
7:41 a.m. - 3:57 p.m.
STL
-
YUL
7h 16m
1 stop
United Airlines Logo
9:25 a.m. - 9:05 p.m.
YUL
-
STL
12h 40m
1 stop
C$ 703United Airlines
Mon, 2 Mar - Wed, 4 Mar
Multiple Airlines Logo
3:49 p.m. - 12:30 a.m.
STL
-
YUL
7h 41m
1 stop
Multiple Airlines Logo
5:25 p.m. - 11:59 p.m.
YUL
-
STL
31h 34m
2 stops
C$ 704Multiple Airlines
Mon, 2 Mar - Wed, 4 Mar
Air Canada Logo
1:00 p.m. - 4:35 p.m.
STL
-
YUL
2h 35mdirect
Air Canada Logo
6:10 p.m. - 8:05 p.m.
YUL
-
STL
2h 55mdirect
C$ 711Air Canada
Tue, 16 Jun - Tue, 23 Jun
United Airlines Logo
9:55 a.m. - 9:42 p.m.
STL
-
YUL
10h 47m
2 stops
United Airlines Logo
9:25 a.m. - 9:05 p.m.
YUL
-
STL
12h 40m
1 stop
C$ 715United Airlines
Mon, 2 Mar - Wed, 4 Mar

Air Canada flights from St. Louis to Montreal

Our best Air Canada deals on St. Louis to Montreal flight tickets
Air Canada
16 Jun
STL1:00 p.m.Lambert-St Louis
2h 35m
YUL4:35 p.m.Montreal Pierre Elliott Trudeau Intl
23 Jun
YUL6:10 p.m.Montreal Pierre Elliott Trudeau Intl
2h 55m
STL8:05 p.m.Lambert-St Louis
C$ 711
Air Canada
16 Jun
STL2:20 p.m.Lambert-St Louis
6h 30m
1 stop
YUL9:50 p.m.Montreal Pierre Elliott Trudeau Intl
23 Jun
YUL6:10 p.m.Montreal Pierre Elliott Trudeau Intl
2h 55m
STL8:05 p.m.Lambert-St Louis
C$ 730
Air Canada
16 Jun
STL7:30 a.m.Lambert-St Louis
10h 14m
2 stops
YUL6:44 p.m.Montreal Pierre Elliott Trudeau Intl
23 Jun
YUL6:10 p.m.Montreal Pierre Elliott Trudeau Intl
2h 55m
STL8:05 p.m.Lambert-St Louis
C$ 737

American Airlines flights from St. Louis to Montreal

Our best American Airlines deals on St. Louis to Montreal flight tickets
American Airlines
5 May
STL8:03 p.m.Lambert-St Louis
14h 41m
1 stop
YUL11:44 a.m.Montreal Pierre Elliott Trudeau Intl
9 May
YUL12:30 p.m.Montreal Pierre Elliott Trudeau Intl
10h 49m
1 stop
STL10:19 p.m.Lambert-St Louis
C$ 467
American Airlines
5 May
STL5:21 p.m.Lambert-St Louis
17h 23m
1 stop
YUL11:44 a.m.Montreal Pierre Elliott Trudeau Intl
9 May
YUL1:03 p.m.Montreal Pierre Elliott Trudeau Intl
11h 53m
2 stops
STL11:56 p.m.Lambert-St Louis
C$ 481
American Airlines
22 Apr
STL8:03 p.m.Lambert-St Louis
14h 41m
1 stop
YUL11:44 a.m.Montreal Pierre Elliott Trudeau Intl
26 Apr
YUL12:30 p.m.Montreal Pierre Elliott Trudeau Intl
12h 16m
1 stop
STL11:46 p.m.Lambert-St Louis
C$ 581

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 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

Tue 5/5

8:03 p.m.-11:44 a.m.

1 stop14h 41m

Montreal Pierre Elliott Trudeau Intl

Sat 9/5

12:30 p.m.-10:19 p.m.

1 stop10h 49m

C$ 467

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 5/5

5:21 p.m.-11:44 a.m.

1 stop17h 23m

Montreal Pierre Elliott Trudeau Intl

Sat 9/5

1:03 p.m.-11:56 p.m.

2 stops11h 53m

C$ 481

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Wed 22/4

8:03 p.m.-11:44 a.m.

1 stop14h 41m

Montreal Pierre Elliott Trudeau Intl

Sun 26/4

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

1 stop12h 16m

C$ 581

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 16/4

6:29 a.m.-12:18 p.m.

1 stop4h 49m

Montreal Pierre Elliott Trudeau Intl

Mon 20/4

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

1 stop12h 16m

C$ 630

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 30/3

6:33 p.m.-2:58 p.m.

1 stop19h 25m

Montreal Pierre Elliott Trudeau Intl

Mon 6/4

7:30 a.m.-12:44 p.m.

1 stop6h 14m

C$ 632

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 13/4

8:03 p.m.-11:44 a.m.

1 stop14h 41m

Montreal Pierre Elliott Trudeau Intl

Thu 16/4

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

1 stop12h 16m

C$ 696

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 2/3

7:41 a.m.-3:57 p.m.

1 stop7h 16m

Montreal Pierre Elliott Trudeau Intl

Wed 4/3

9:25 a.m.-9:05 p.m.

1 stop12h 40m

C$ 703

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 2/3

3:49 p.m.-12:30 a.m.

1 stop7h 41m

Montreal Pierre Elliott Trudeau Intl

Wed 4/3

5:25 p.m.-11:59 p.m.

2 stops31h 34m

C$ 704

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 16/6

1:00 p.m.-4:35 p.m.

Nonstop2h 35m

Montreal Pierre Elliott Trudeau Intl

Tue 23/6

6:10 p.m.-8:05 p.m.

Nonstop2h 55m

C$ 711

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 2/3

9:55 a.m.-9:42 p.m.

2 stops10h 47m

Montreal Pierre Elliott Trudeau Intl

Wed 4/3

9:25 a.m.-9:05 p.m.

1 stop12h 40m

C$ 715

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 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

Fastest flight time

2h 35m

Direct flights

Wed, Thu, Fri, Sat and Sun

Airports in Montreal

2 airports
The fastest flight from St. Louis to Montreal takes 2h 35m
Direct flights go from St. Louis to Montreal on Wednesday, Thursday, Friday, Saturday and Sunday. There are no airlines offering direct flights.
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 35m, 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