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Cheap flights from St. Louis to Montreal from C$ 175

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 21/4. 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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Cheap round-trip flights

Enter your travel dates to find the best prices.
American Airlines Logo
5:21 p.m. - 11:44 a.m.
STL
-
YUL
17h 23m
1 stop
American Airlines Logo
12:30 p.m. - 11:46 p.m.
YUL
-
STL
12h 16m
1 stop
C$ 467American Airlines
Tue, 7 Apr - Thu, 9 Apr
American Airlines Logo
8:03 p.m. - 11:44 a.m.
STL
-
YUL
14h 41m
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
4:30 p.m. - 11:44 a.m.
STL
-
YUL
18h 14m
1 stop
American Airlines Logo
12:30 p.m. - 10:19 p.m.
YUL
-
STL
10h 49m
1 stop
C$ 504American 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
1:03 p.m. - 11:56 p.m.
YUL
-
STL
11h 53m
2 stops
C$ 517American 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
12:30 p.m. - 11:46 p.m.
YUL
-
STL
12h 16m
1 stop
C$ 538American Airlines
Fri, 17 Apr - Tue, 21 Apr
United Airlines Logo
7:45 a.m. - 5:30 p.m.
STL
-
YUL
8h 45m
1 stop
United Airlines Logo
6:30 p.m. - 9:08 p.m.
YUL
-
STL
27h 38m
1 stop
C$ 541United Airlines
Wed, 22 Apr - Sun, 26 Apr
United Airlines Logo
6:35 p.m. - 12:47 p.m.
STL
-
YUL
17h 12m
2 stops
United Airlines Logo
6:30 p.m. - 9:08 p.m.
YUL
-
STL
27h 38m
1 stop
C$ 553United Airlines
Wed, 22 Apr - Sun, 26 Apr
American Airlines Logo
5:21 p.m. - 11:44 a.m.
STL
-
YUL
17h 23m
1 stop
American Airlines Logo
12:30 p.m. - 10:17 p.m.
YUL
-
STL
10h 47m
1 stop
C$ 576American Airlines
Fri, 17 Apr - Mon, 20 Apr
American Airlines Logo
2:33 p.m. - 11:44 a.m.
STL
-
YUL
20h 11m
1 stop
American Airlines Logo
7:29 a.m. - 6:04 p.m.
YUL
-
STL
11h 35m
1 stop
C$ 621American Airlines
Tue, 21 Apr - Fri, 24 Apr
American Airlines Logo
7:05 a.m. - 10:48 p.m.
STL
-
YUL
14h 43m
1 stop
American Airlines Logo
3:45 p.m. - 8:26 a.m.
YUL
-
STL
17h 41m
1 stop
C$ 658American Airlines
Fri, 3 Apr - Mon, 6 Apr

Air Canada flights from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport

Our best Air Canada deals on St. Louis to Montreal Pierre Elliott Trudeau Intl Airport flight tickets
Air Canada
3 May
STL1:00 p.m.Lambert-St Louis
2h 35m
YUL4:35 p.m.Montreal Pierre Elliott Trudeau Intl
9 May
YUL6:10 p.m.Montreal Pierre Elliott Trudeau Intl
2h 55m
STL8:05 p.m.Lambert-St Louis
C$ 778
Air Canada
16 Jun
STL1:00 p.m.Lambert-St Louis
2h 35m
YUL4:35 p.m.Montreal Pierre Elliott Trudeau Intl
23 Jun
YUL7:05 a.m.Montreal Pierre Elliott Trudeau Intl
6h 16m
1 stop
STL12:21 p.m.Lambert-St Louis
C$ 796
Air Canada
28 Jul
STL12:10 p.m.Lambert-St Louis
2h 32m
YUL3:42 p.m.Montreal Pierre Elliott Trudeau Intl
3 Aug
YUL8:40 a.m.Montreal Pierre Elliott Trudeau Intl
6h 22m
2 stops
STL2:02 p.m.Lambert-St Louis
C$ 803

American Airlines flights from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport

Our best American Airlines deals on St. Louis to Montreal Pierre Elliott Trudeau Intl Airport flight tickets
American Airlines
7 Apr
STL5:21 p.m.Lambert-St Louis
17h 23m
1 stop
YUL11:44 a.m.Montreal Pierre Elliott Trudeau Intl
9 Apr
YUL12:30 p.m.Montreal Pierre Elliott Trudeau Intl
12h 16m
1 stop
STL11:46 p.m.Lambert-St Louis
C$ 467
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
YUL1:03 p.m.Montreal Pierre Elliott Trudeau Intl
11h 53m
2 stops
STL11:56 p.m.Lambert-St Louis
C$ 481
American Airlines
5 May
STL4:30 p.m.Lambert-St Louis
18h 14m
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$ 504

momondo Fare Finder

 
Customize your flight search to find flights from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport 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 5 February 2026.
Use the filters below to find and compare flights from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 7/4

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

1 stop17h 23m

Montreal Pierre Elliott Trudeau Intl

Thu 9/4

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

1 stop12h 16m

C$ 467

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

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

2 stops11h 53m

C$ 481

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 5/5

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

1 stop18h 14m

Montreal Pierre Elliott Trudeau Intl

Sat 9/5

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

1 stop10h 49m

C$ 504

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

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

2 stops11h 53m

C$ 517

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Fri 17/4

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

1 stop17h 23m

Montreal Pierre Elliott Trudeau Intl

Tue 21/4

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

1 stop12h 16m

C$ 538

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Wed 22/4

7:45 a.m.-5:30 p.m.

1 stop8h 45m

Montreal Pierre Elliott Trudeau Intl

Sun 26/4

6:30 p.m.-9:08 p.m.

1 stop27h 38m

C$ 541

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Wed 22/4

6:35 p.m.-12:47 p.m.

2 stops17h 12m

Montreal Pierre Elliott Trudeau Intl

Sun 26/4

6:30 p.m.-9:08 p.m.

1 stop27h 38m

C$ 553

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Fri 17/4

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

1 stop17h 23m

Montreal Pierre Elliott Trudeau Intl

Mon 20/4

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

1 stop10h 47m

C$ 576

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 21/4

2:33 p.m.-11:44 a.m.

1 stop20h 11m

Montreal Pierre Elliott Trudeau Intl

Fri 24/4

7:29 a.m.-6:04 p.m.

1 stop11h 35m

C$ 621

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Fri 3/4

7:05 a.m.-10:48 p.m.

1 stop14h 43m

Montreal Pierre Elliott Trudeau Intl

Mon 6/4

3:45 p.m.-8:26 a.m.

1 stop17h 41m

C$ 658

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 Pierre Elliott Trudeau Intl Airport

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 month to fly to Montreal Pierre Elliott Trudeau Intl Airport?

The month of July is, on average, the cheapest month to fly to Montreal Pierre Elliott Trudeau Intl Airport from St. Louis, with most prices found around C$ 486. The month of May is another great option to travel to Montreal Pierre Elliott Trudeau Intl Airport, with average flight prices from St. Louis averaging around C$ 786.

What is the cheapest Lambert-St Louis to Montreal Pierre Elliott Trudeau Intl flight route?

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

What cabin class options are available on Lambert-St Louis to Montreal Pierre Elliott Trudeau Intl flights?

There is only 1 cabin class available to choose from on Lambert-St Louis to Montreal Pierre Elliott Trudeau Intl 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 Pierre Elliott Trudeau Intl Airport flights?

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

When to book flights from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport

Are you open to changing your travel dates? Check out the ideal times to fly from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap St. Louis to Montreal Pierre Elliott Trudeau Intl Airport (STL to YUL) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport

Fastest flight time

2h 32m

Direct flights

Every day
The fastest flight from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport takes 2h 32m
Direct flights go from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport every day.
Search flight deals

  • How far is Lambert-St Louis to Montreal Pierre Elliott Trudeau Intl by plane?

    The distance between Lambert-St Louis and Montreal Pierre Elliott Trudeau Intl is about 1551.0 km. 2h 32m is a normal flight duration for this route.

  • When did momondo last update prices for flights from Lambert-St Louis Airport to Montreal Pierre Elliott Trudeau Intl Airport?

    Prices for flights from Lambert-St Louis Airport to Montreal Pierre Elliott Trudeau Intl Airport are updated daily.

  • How old do you have to be to fly from Lambert-St Louis Airport to Montreal Pierre Elliott Trudeau Intl Airport?

    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 Pierre Elliott Trudeau Intl Airport.

  • What documentation or ID do you need to fly to Montreal Pierre Elliott Trudeau Intl Airport?

    The necessary travel and health documents for your Montreal Pierre Elliott Trudeau Intl Airport 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 Pierre Elliott Trudeau Intl Airport?

Travelling to a place near Montreal?

Book flights to Montreal if you plan to visit one of these locations
Laval
Trois-Rivières
Montebello
Sherbrooke
Brossard
Longueuil
Cornwall
Dorval
Boucherville
North Hatley
Magog
Saint-Sauveur
Drummondville
Bromont
Saint-Jean-sur-Richelieu
Sutton
Waterloo

Why use momondo?

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

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from St. Louis to Montreal for you.

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?

momondo helps you find the best flight between St. Louis and Montreal by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

I’m not ready to book a flight from St. Louis to Montreal right now. Can momondo alert me if prices change?

Of course. momondo tracks the price of St. Louis to Montreal flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

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