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Cheap flights from St. Louis to Montreal from C$ 252

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 9/12. 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
6:33 p.m. - 3:05 p.m.STL-YUL
19h 32m1 stop
American Airlines Logo
3:55 p.m. - 9:33 a.m.YUL-STL
18h 38m1 stop
C$ 405American Airlines
Find Deal
Sat, 14 Feb - Wed, 18 Feb
American Airlines Logo
10:03 a.m. - 10:50 p.m.STL-YUL
11h 47m2 stops
American Airlines Logo
3:55 p.m. - 9:33 a.m.YUL-STL
18h 38m1 stop
C$ 419American Airlines
Find Deal
Sat, 14 Feb - Wed, 18 Feb
United Airlines Logo
7:41 a.m. - 9:17 p.m.STL-YUL
12h 36m1 stop
United Airlines Logo
1:10 p.m. - 10:59 p.m.YUL-STL
10h 49m1 stop
C$ 538United Airlines
Find Deal
Tue, 17 Feb - Thu, 19 Feb
Multiple Airlines Logo
3:30 p.m. - 12:30 a.m.STL-YUL
8h 00m1 stop
Multiple Airlines Logo
7:20 p.m. - 9:45 a.m.YUL-STL
39h 25m2 stops
C$ 786Multiple Airlines
Find Deal
Sat, 13 Dec - Sat, 20 Dec
Multiple Airlines Logo
3:30 p.m. - 7:44 p.m.STL-YUL
27h 14m2 stops
Multiple Airlines Logo
4:45 p.m. - 8:47 p.m.YUL-STL
5h 02m1 stop
C$ 794Multiple Airlines
Find Deal
Fri, 5 Dec - Mon, 8 Dec
United Airlines Logo
6:35 p.m. - 3:57 p.m.STL-YUL
20h 22m1 stop
United Airlines Logo
9:15 a.m. - 10:58 p.m.YUL-STL
14h 43m2 stops
C$ 812United Airlines
Find Deal
Tue, 30 Dec - Thu, 8 Jan
Delta Logo
6:39 a.m. - 6:54 p.m.STL-YUL
11h 15m2 stops
Delta Logo
9:34 a.m. - 8:45 p.m.YUL-STL
12h 11m2 stops
C$ 853Delta
Find Deal
Mon, 15 Dec - Tue, 6 Jan
Delta Logo
6:40 a.m. - 3:55 p.m.STL-YUL
8h 15m1 stop
Delta Logo
9:35 a.m. - 8:47 p.m.YUL-STL
12h 12m2 stops
C$ 932Delta
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Wed, 26 Nov - Wed, 3 Dec
Air Canada Logo
5:27 p.m. - 1:53 a.m.STL-YUL
7h 26m2 stops
Air Canada Logo
8:50 a.m. - 3:29 p.m.YUL-STL
7h 39m2 stops
C$ 1,120Air Canada
Find Deal
Wed, 3 Dec - Sun, 7 Dec
Air Canada Logo
3:14 p.m. - 12:32 a.m.STL-YUL
8h 18m2 stops
Air Canada Logo
8:00 a.m. - 3:40 p.m.YUL-STL
8h 40m2 stops
C$ 1,206Air Canada
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Wed, 26 Nov - Wed, 3 Dec

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

Our best Delta deals on St. Louis to Montreal Pierre Elliott Trudeau Intl Airport flight tickets
Delta
15 Dec
STL6:39 a.m.Lambert-St Louis
11h 15m
2 stops
YUL6:54 p.m.Montreal Pierre Elliott Trudeau Intl
6 Jan
YUL9:34 a.m.Montreal Pierre Elliott Trudeau Intl
12h 11m
2 stops
STL8:45 p.m.Lambert-St Louis
C$ 853
Find similar
Delta
26 Nov
STL6:40 a.m.Lambert-St Louis
8h 15m
1 stop
YUL3:55 p.m.Montreal Pierre Elliott Trudeau Intl
3 Dec
YUL9:35 a.m.Montreal Pierre Elliott Trudeau Intl
12h 12m
2 stops
STL8:47 p.m.Lambert-St Louis
C$ 932
Find similar
Delta
5 Dec
STL5:12 p.m.Lambert-St Louis
5h 47m
1 stop
YUL11:59 p.m.Montreal Pierre Elliott Trudeau Intl
8 Dec
YUL9:35 a.m.Montreal Pierre Elliott Trudeau Intl
12h 12m
2 stops
STL8:47 p.m.Lambert-St Louis
C$ 958
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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 Dec
STL5:27 p.m.Lambert-St Louis
7h 26m
2 stops
YUL1:53 a.m.Montreal Pierre Elliott Trudeau Intl
7 Dec
YUL8:50 a.m.Montreal Pierre Elliott Trudeau Intl
7h 39m
2 stops
STL3:29 p.m.Lambert-St Louis
C$ 1,120
Find similar
Air Canada
26 Nov
STL3:14 p.m.Lambert-St Louis
8h 18m
2 stops
YUL12:32 a.m.Montreal Pierre Elliott Trudeau Intl
3 Dec
YUL8:00 a.m.Montreal Pierre Elliott Trudeau Intl
8h 40m
2 stops
STL3:40 p.m.Lambert-St Louis
C$ 1,206
Find similar
Air Canada
20 Mar
STL4:05 p.m.Lambert-St Louis
4h 47m
1 stop
YUL9:52 p.m.Montreal Pierre Elliott Trudeau Intl
24 Mar
YUL9:10 a.m.Montreal Pierre Elliott Trudeau Intl
7h 19m
1 stop
STL3:29 p.m.Lambert-St Louis
C$ 1,300
Find similar

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 30 October 2025.
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

Sat 14/2

6:33 p.m.-3:05 p.m.

1 stop19h 32m

Montreal Pierre Elliott Trudeau Intl

Wed 18/2

3:55 p.m.-9:33 a.m.

1 stop18h 38m

C$ 405

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sat 14/2

10:03 a.m.-10:50 p.m.

2 stops11h 47m

Montreal Pierre Elliott Trudeau Intl

Wed 18/2

3:55 p.m.-9:33 a.m.

1 stop18h 38m

C$ 419

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 17/2

7:41 a.m.-9:17 p.m.

1 stop12h 36m

Montreal Pierre Elliott Trudeau Intl

Thu 19/2

1:10 p.m.-10:59 p.m.

1 stop10h 49m

C$ 538

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sat 13/12

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

1 stop8h 00m

Montreal Pierre Elliott Trudeau Intl

Sat 20/12

7:20 p.m.-9:45 a.m.

2 stops39h 25m

C$ 786

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Fri 5/12

3:30 p.m.-7:44 p.m.

2 stops27h 14m

Montreal Pierre Elliott Trudeau Intl

Mon 8/12

4:45 p.m.-8:47 p.m.

1 stop5h 02m

C$ 794

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 30/12

6:35 p.m.-3:57 p.m.

1 stop20h 22m

Montreal Pierre Elliott Trudeau Intl

Thu 8/1

9:15 a.m.-10:58 p.m.

2 stops14h 43m

C$ 812

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 15/12

6:39 a.m.-6:54 p.m.

2 stops11h 15m

Montreal Pierre Elliott Trudeau Intl

Tue 6/1

9:34 a.m.-8:45 p.m.

2 stops12h 11m

C$ 853

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Wed 26/11

6:40 a.m.-3:55 p.m.

1 stop8h 15m

Montreal Pierre Elliott Trudeau Intl

Wed 3/12

9:35 a.m.-8:47 p.m.

2 stops12h 12m

C$ 932

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Wed 3/12

5:27 p.m.-1:53 a.m.

2 stops7h 26m

Montreal Pierre Elliott Trudeau Intl

Sun 7/12

8:50 a.m.-3:29 p.m.

2 stops7h 39m

C$ 1,120

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Wed 26/11

3:14 p.m.-12:32 a.m.

2 stops8h 18m

Montreal Pierre Elliott Trudeau Intl

Wed 3/12

8:00 a.m.-3:40 p.m.

2 stops8h 40m

C$ 1,206

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 12 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?

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$ 496. 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$ 802.

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

Direct flights

None
There are no direct flights from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport. There are no popular flight routes from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport.
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  • 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. 4h 47m 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
Montebello
Sherbrooke
Trois-Rivières
Brossard
Dorval
Drummondville
Cornwall
North Hatley
Longueuil
Magog
Saint-Sauveur
Bromont
Saint-Jean-sur-Richelieu
Boucherville
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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