Latest deals
Insights
When to book
FAQs
Price Alerts

Cheap flights from St. Louis to Montreal from C$ 150

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 3/2. 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

Save money when you book flights with momondo

Big names, great deals

Big names, great deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Early arrival? Instantly customize your results

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

Find the cheapest flights from St. Louis to Montreal

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
10:09 p.m. - 7:05 a.m.
STL
-
YUL
31h 56m2 stops
Multiple Airlines Logo
4:35 p.m. - 9:21 a.m.
YUL
-
STL
17h 46m1 stop
C$ 425Multiple Airlines
Sun, 18 Jan - Sun, 25 Jan
Multiple Airlines Logo
9:09 a.m. - 5:00 p.m.
STL
-
YUL
30h 51m2 stops
Multiple Airlines Logo
4:35 p.m. - 9:21 a.m.
YUL
-
STL
17h 46m1 stop
C$ 465Multiple Airlines
Sun, 1 Feb - Sun, 8 Feb
Multiple Airlines Logo
8:22 p.m. - 3:10 p.m.
STL
-
YUL
17h 48m2 stops
Multiple Airlines Logo
4:35 p.m. - 9:21 a.m.
YUL
-
STL
17h 46m1 stop
C$ 477Multiple Airlines
Wed, 21 Jan - Sun, 25 Jan
Multiple Airlines Logo
10:06 a.m. - 12:30 a.m.
STL
-
YUL
13h 24m1 stop
Multiple Airlines Logo
6:45 a.m. - 10:23 a.m.
YUL
-
STL
28h 38m2 stops
C$ 482Multiple Airlines
Sun, 18 Jan - Thu, 22 Jan
Multiple Airlines Logo
10:06 a.m. - 12:30 a.m.
STL
-
YUL
13h 24m1 stop
Multiple Airlines Logo
8:00 a.m. - 11:33 p.m.
YUL
-
STL
40h 33m2 stops
C$ 484Multiple Airlines
Sun, 18 Jan - Wed, 28 Jan
Multiple Airlines Logo
10:06 a.m. - 12:30 a.m.
STL
-
YUL
13h 24m1 stop
Multiple Airlines Logo
4:35 p.m. - 9:21 a.m.
YUL
-
STL
17h 46m1 stop
C$ 509Multiple Airlines
Sun, 18 Jan - Sun, 25 Jan
Multiple Airlines Logo
11:18 a.m. - 12:30 a.m.
STL
-
YUL
12h 12m1 stop
Multiple Airlines Logo
8:00 a.m. - 6:51 a.m.
YUL
-
STL
23h 51m2 stops
C$ 522Multiple Airlines
Fri, 6 Feb - Tue, 10 Feb
Multiple Airlines Logo
5:42 p.m. - 12:43 a.m.
STL
-
YUL
30h 01m2 stops
Multiple Airlines Logo
4:35 p.m. - 9:21 a.m.
YUL
-
STL
17h 46m1 stop
C$ 535Multiple Airlines
Tue, 20 Jan - Sun, 25 Jan
Multiple Airlines Logo
10:06 a.m. - 12:30 a.m.
STL
-
YUL
13h 24m1 stop
Multiple Airlines Logo
6:45 a.m. - 11:33 p.m.
YUL
-
STL
17h 48m2 stops
C$ 542Multiple Airlines
Sun, 18 Jan - Mon, 26 Jan
Multiple Airlines Logo
5:11 p.m. - 12:30 a.m.
STL
-
YUL
30h 19m1 stop
Multiple Airlines Logo
6:45 a.m. - 11:33 p.m.
YUL
-
STL
17h 48m2 stops
C$ 551Multiple Airlines
Sat, 17 Jan - Wed, 21 Jan

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
4 Feb
STL6:00 a.m.Lambert-St Louis
8h 08m
1 stop
YUL3:08 p.m.Montreal Pierre Elliott Trudeau Intl
11 Feb
YUL3:50 p.m.Montreal Pierre Elliott Trudeau Intl
18h 44m
1 stop
STL9:34 a.m.Lambert-St Louis
C$ 582
Find similar
American Airlines
26 Feb
STL6:00 a.m.Lambert-St Louis
8h 05m
1 stop
YUL3:05 p.m.Montreal Pierre Elliott Trudeau Intl
2 Mar
YUL3:55 p.m.Montreal Pierre Elliott Trudeau Intl
18h 34m
1 stop
STL9:29 a.m.Lambert-St Louis
C$ 589
Find similar
American Airlines
18 Jan
STL6:44 p.m.Lambert-St Louis
19h 24m
1 stop
YUL3:08 p.m.Montreal Pierre Elliott Trudeau Intl
25 Jan
YUL3:50 p.m.Montreal Pierre Elliott Trudeau Intl
19h 30m
1 stop
STL10:20 a.m.Lambert-St Louis
C$ 741
Find similar

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
20 Jan
STL5:32 p.m.Lambert-St Louis
14h 12m
1 stop
YUL8:44 a.m.Montreal Pierre Elliott Trudeau Intl
26 Jan
YUL7:30 p.m.Montreal Pierre Elliott Trudeau Intl
14h 04m
1 stop
STL8:34 a.m.Lambert-St Louis
C$ 709
Find similar
Delta
18 Jan
STL5:32 p.m.Lambert-St Louis
18h 50m
1 stop
YUL1:22 p.m.Montreal Pierre Elliott Trudeau Intl
28 Jan
YUL9:34 a.m.Montreal Pierre Elliott Trudeau Intl
11h 32m
1 stop
STL8:06 p.m.Lambert-St Louis
C$ 745
Find similar
Delta
17 Jan
STL1:20 p.m.Lambert-St Louis
23h 02m
1 stop
YUL1:22 p.m.Montreal Pierre Elliott Trudeau Intl
28 Jan
YUL9:34 a.m.Montreal Pierre Elliott Trudeau Intl
11h 32m
1 stop
STL8:06 p.m.Lambert-St Louis
C$ 748
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 21 December 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

Sun 18/1

10:09 p.m.-7:05 a.m.

2 stops31h 56m

Montreal Pierre Elliott Trudeau Intl

Sun 25/1

4:35 p.m.-9:21 a.m.

1 stop17h 46m

C$ 425

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sun 1/2

9:09 a.m.-5:00 p.m.

2 stops30h 51m

Montreal Pierre Elliott Trudeau Intl

Sun 8/2

4:35 p.m.-9:21 a.m.

1 stop17h 46m

C$ 465

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Wed 21/1

8:22 p.m.-3:10 p.m.

2 stops17h 48m

Montreal Pierre Elliott Trudeau Intl

Sun 25/1

4:35 p.m.-9:21 a.m.

1 stop17h 46m

C$ 477

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sun 18/1

10:06 a.m.-12:30 a.m.

1 stop13h 24m

Montreal Pierre Elliott Trudeau Intl

Thu 22/1

6:45 a.m.-10:23 a.m.

2 stops28h 38m

C$ 482

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sun 18/1

10:06 a.m.-12:30 a.m.

1 stop13h 24m

Montreal Pierre Elliott Trudeau Intl

Wed 28/1

8:00 a.m.-11:33 p.m.

2 stops40h 33m

C$ 484

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sun 18/1

10:06 a.m.-12:30 a.m.

1 stop13h 24m

Montreal Pierre Elliott Trudeau Intl

Sun 25/1

4:35 p.m.-9:21 a.m.

1 stop17h 46m

C$ 509

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Fri 6/2

11:18 a.m.-12:30 a.m.

1 stop12h 12m

Montreal Pierre Elliott Trudeau Intl

Tue 10/2

8:00 a.m.-6:51 a.m.

2 stops23h 51m

C$ 522

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 20/1

5:42 p.m.-12:43 a.m.

2 stops30h 01m

Montreal Pierre Elliott Trudeau Intl

Sun 25/1

4:35 p.m.-9:21 a.m.

1 stop17h 46m

C$ 535

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sun 18/1

10:06 a.m.-12:30 a.m.

1 stop13h 24m

Montreal Pierre Elliott Trudeau Intl

Mon 26/1

6:45 a.m.-11:33 p.m.

2 stops17h 48m

C$ 542

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sat 17/1

5:11 p.m.-12:30 a.m.

1 stop30h 19m

Montreal Pierre Elliott Trudeau Intl

Wed 21/1

6:45 a.m.-11:33 p.m.

2 stops17h 48m

C$ 551

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 16 resultsSorted by cheapest first
1
2

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$ 491. 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$ 795.

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 35m

Direct flights

Thu and Sat
The fastest flight from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport takes 2h 35m
Direct flights go from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport on Thursday and Saturday. There are no airlines offering direct flights.
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 35m 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
Trois-Rivières
Sherbrooke
Brossard
Longueuil
Boucherville
Dorval
North Hatley
Cornwall
Drummondville
Magog
Saint-Sauveur
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.

An easier way to manage your Montreal Pierre Elliott Trudeau Intl Airport trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Tue 20/1
Tue 27/1
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to Montreal