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Cheap flights from St. Louis to Montreal from C$ 276

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 13/10. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

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
5:13 p.m. - 11:43 a.m.STL  Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl
17h 30m1 stop Chicago O'Hare Intl
American Airlines Logo
12:31 p.m. - 8:44 p.m.YUL  Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis
9h 13m1 stop Chicago O'Hare Intl
C$ 678American Airlines
Sat, 5 Sep - Fri, 11 Sep
American Airlines Logo
5:00 a.m. - 4:52 p.m.STL  Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl
10h 52m1 stop Chicago O'Hare Intl
American Airlines Logo
12:30 p.m. - 12:09 a.m.YUL  Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis
12h 39m1 stop Chicago O'Hare Intl
C$ 717American Airlines
Sat, 17 Oct - Wed, 21 Oct
Multiple Airlines Logo
8:34 p.m. - 2:08 p.m.STL  Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl
16h 34m2 stops Orlando Newark
Multiple Airlines Logo
9:30 a.m. - 8:14 p.m.YUL  Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis
11h 44m1 stop New York LaGuardia
C$ 735Multiple Airlines
Mon, 19 Oct - Thu, 22 Oct
American Airlines Logo
4:37 p.m. - 9:49 a.m.STL  Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl
16h 12m1 stop New York LaGuardia
American Airlines Logo
10:32 a.m. - 9:46 p.m.YUL  Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis
12h 14m1 stop New York LaGuardia
C$ 743American Airlines
Wed, 30 Sep - Wed, 7 Oct
Multiple Airlines Logo
2:29 p.m. - 7:05 a.m.STL  Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl
15h 36m2 stops Atlanta Hartsfield-Jackson Calgary
Multiple Airlines Logo
6:47 p.m. - 11:42 p.m.YUL  Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis
5h 55m1 stop Atlanta Hartsfield-Jackson
C$ 746Multiple Airlines
Mon, 14 Sep - Thu, 17 Sep
American Airlines Logo
2:55 p.m. - 9:49 a.m.STL  Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl
17h 54m1 stop New York LaGuardia
American Airlines Logo
10:30 a.m. - 9:17 p.m.YUL  Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis
11h 47m1 stop New York LaGuardia
C$ 750American Airlines
Tue, 8 Sep - Tue, 15 Sep
American Airlines Logo
7:29 a.m. - 4:52 p.m.STL  Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl
8h 23m1 stop Chicago O'Hare Intl
American Airlines Logo
10:32 a.m. - 9:46 p.m.YUL  Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis
12h 14m1 stop New York LaGuardia
C$ 761American Airlines
Sat, 17 Oct - Wed, 21 Oct
American Airlines Logo
2:55 p.m. - 9:46 a.m.STL  Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl
17h 51m1 stop New York LaGuardia
American Airlines Logo
5:34 p.m. - 8:24 a.m.YUL  Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis
15h 50m1 stop Chicago O'Hare Intl
C$ 766American Airlines
Tue, 1 Sep - Fri, 4 Sep
Multiple Airlines Logo
2:29 p.m. - 7:05 a.m.STL  Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl
15h 36m2 stops Atlanta Hartsfield-Jackson Calgary
Multiple Airlines Logo
6:47 p.m. - 11:42 p.m.YUL  Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis
5h 55m1 stop Atlanta Hartsfield-Jackson
C$ 767Multiple Airlines
Fri, 2 Oct - Mon, 5 Oct
Multiple Airlines Logo
2:29 p.m. - 7:05 a.m.STL  Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl
15h 36m2 stops Atlanta Hartsfield-Jackson Calgary
Multiple Airlines Logo
6:47 p.m. - 11:42 p.m.YUL  Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis
5h 55m1 stop Atlanta Hartsfield-Jackson
C$ 771Multiple Airlines
Fri, 2 Oct - Mon, 5 Oct

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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
5 Sep
STL5:13 p.m.Lambert-St Louis
17h 30m
1 stop
YUL11:43 a.m.Montreal Pierre Elliott Trudeau Intl
11 Sep
YUL12:31 p.m.Montreal Pierre Elliott Trudeau Intl
9h 13m
1 stop
STL8:44 p.m.Lambert-St Louis
C$ 678
American Airlines
17 Oct
STL5:00 a.m.Lambert-St Louis
10h 52m
1 stop
YUL4:52 p.m.Montreal Pierre Elliott Trudeau Intl
21 Oct
YUL12:30 p.m.Montreal Pierre Elliott Trudeau Intl
12h 39m
1 stop
STL12:09 a.m.Lambert-St Louis
C$ 717
American Airlines
30 Sep
STL4:37 p.m.Lambert-St Louis
16h 12m
1 stop
YUL9:49 a.m.Montreal Pierre Elliott Trudeau Intl
7 Oct
YUL10:32 a.m.Montreal Pierre Elliott Trudeau Intl
12h 14m
1 stop
STL9:46 p.m.Lambert-St Louis
C$ 743

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

Our best WestJet deals on St. Louis to Montreal Pierre Elliott Trudeau Intl Airport flight tickets
WestJet
27 Aug
STL6:30 a.m.Lambert-St Louis
4h 26m
1 stop
YUL11:56 a.m.Montreal Pierre Elliott Trudeau Intl
30 Aug
YUL7:00 a.m.Montreal Pierre Elliott Trudeau Intl
5h 46m
1 stop
STL11:46 a.m.Lambert-St Louis
C$ 821
WestJet
19 Oct
STL5:35 p.m.Lambert-St Louis
5h 24m
1 stop
YUL11:59 p.m.Montreal Pierre Elliott Trudeau Intl
22 Oct
YUL9:30 a.m.Montreal Pierre Elliott Trudeau Intl
11h 44m
1 stop
STL8:14 p.m.Lambert-St Louis
C$ 824
WestJet
24 Aug
STL6:20 a.m.Lambert-St Louis
16h 20m
1 stop
YUL11:40 p.m.Montreal Pierre Elliott Trudeau Intl
28 Aug
YUL8:00 p.m.Montreal Pierre Elliott Trudeau Intl
14h 20m
2 stops
STL9:20 a.m.Lambert-St Louis
C$ 835

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 11 August 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

Cheapest round-trip

St. LouisMontreal

STL Lambert-St Louis - YUL Montreal Pierre Elliott Trudeau Intl

STLYUL

Lambert-St Louis

Sat 5/9

5:13 p.m.-11:43 a.m.

1 stop17h 30m

Montreal Pierre Elliott Trudeau Intl

Fri 11/9

12:31 p.m.-8:44 p.m.

1 stop9h 13m

C$ 678

St. LouisMontreal

STL Lambert-St Louis - YUL Montreal Pierre Elliott Trudeau Intl

STLYUL

Lambert-St Louis

Sat 17/10

5:00 a.m.-4:52 p.m.

1 stop10h 52m

Montreal Pierre Elliott Trudeau Intl

Wed 21/10

12:30 p.m.-12:09 a.m.

1 stop12h 39m

C$ 717

St. LouisMontreal

STL Lambert-St Louis - YUL Montreal Pierre Elliott Trudeau Intl

STLYUL

Lambert-St Louis

Mon 19/10

8:34 p.m.-2:08 p.m.

2 stops16h 34m

Montreal Pierre Elliott Trudeau Intl

Thu 22/10

9:30 a.m.-8:14 p.m.

1 stop11h 44m

C$ 735

St. LouisMontreal

STL Lambert-St Louis - YUL Montreal Pierre Elliott Trudeau Intl

STLYUL

Lambert-St Louis

Wed 30/9

4:37 p.m.-9:49 a.m.

1 stop16h 12m

Montreal Pierre Elliott Trudeau Intl

Wed 7/10

10:32 a.m.-9:46 p.m.

1 stop12h 14m

C$ 743

St. LouisMontreal

STL Lambert-St Louis - YUL Montreal Pierre Elliott Trudeau Intl

STLYUL

Lambert-St Louis

Mon 14/9

2:29 p.m.-7:05 a.m.

2 stops15h 36m

Montreal Pierre Elliott Trudeau Intl

Thu 17/9

6:47 p.m.-11:42 p.m.

1 stop5h 55m

C$ 746

St. LouisMontreal

STL Lambert-St Louis - YUL Montreal Pierre Elliott Trudeau Intl

STLYUL

Lambert-St Louis

Tue 8/9

2:55 p.m.-9:49 a.m.

1 stop17h 54m

Montreal Pierre Elliott Trudeau Intl

Tue 15/9

10:30 a.m.-9:17 p.m.

1 stop11h 47m

C$ 750
Quickest round-trip

St. LouisMontreal

STL Lambert-St Louis - YUL Montreal Pierre Elliott Trudeau Intl

STLYUL

Lambert-St Louis

Sat 17/10

7:29 a.m.-4:52 p.m.

1 stop8h 23m

Montreal Pierre Elliott Trudeau Intl

Wed 21/10

10:32 a.m.-9:46 p.m.

1 stop12h 14m

C$ 761

St. LouisMontreal

STL Lambert-St Louis - YUL Montreal Pierre Elliott Trudeau Intl

STLYUL

Lambert-St Louis

Tue 1/9

2:55 p.m.-9:46 a.m.

1 stop17h 51m

Montreal Pierre Elliott Trudeau Intl

Fri 4/9

5:34 p.m.-8:24 a.m.

1 stop15h 50m

C$ 766

St. LouisMontreal

STL Lambert-St Louis - YUL Montreal Pierre Elliott Trudeau Intl

STLYUL

Lambert-St Louis

Fri 2/10

2:29 p.m.-7:05 a.m.

2 stops15h 36m

Montreal Pierre Elliott Trudeau Intl

Mon 5/10

6:47 p.m.-11:42 p.m.

1 stop5h 55m

C$ 767

St. LouisMontreal

STL Lambert-St Louis - YUL Montreal Pierre Elliott Trudeau Intl

STLYUL

Lambert-St Louis

Fri 2/10

2:29 p.m.-7:05 a.m.

2 stops15h 36m

Montreal Pierre Elliott Trudeau Intl

Mon 5/10

6:47 p.m.-11:42 p.m.

1 stop5h 55m

C$ 771

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 typical price of a round-trip flight between St. Louis and Montreal Pierre Elliott Trudeau Intl Airport?

Prices are currently typical for flights on this route.

Typical prices usually range from C$ 413 to C$ 1,519.
The lowest price recently found on this route was C$ 678.

What is the cheapest month to fly to Montreal Pierre Elliott Trudeau Intl Airport?

The month of February is, on average, the cheapest month to fly to Montreal Pierre Elliott Trudeau Intl Airport from St. Louis, with most prices found around C$ 0. The month of December 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 St. Louis to Montreal Pierre Elliott Trudeau Intl Airport flights?

There is only 1 cabin class available to choose from on St. Louis to Montreal Pierre Elliott Trudeau Intl Airport flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

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 31m

Direct flights

Tue, Wed, Thu, Fri, Sat and Sun
The fastest flight from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport takes 2h 31m
Direct flights go from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport on Tuesday, Wednesday, Thursday, Friday, Saturday and Sunday. There are no airlines offering direct flights.
Search flight deals

Frequently asked questions about flying from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport

  • 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 31m 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
Brossard
Dorval
Sherbrooke
Montebello
Cornwall
Longueuil
Saint-Sauveur
Boucherville
North Hatley
Drummondville
Magog
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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