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Cheap flights from St. Louis to Montreal from C$ 244

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 5/5. 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
7:50 p.m. - 11:44 a.m.
STL
-
YUL
14h 54m
1 stop
American Airlines Logo
5:33 p.m. - 8:31 a.m.
YUL
-
STL
15h 58m
1 stop
C$ 641American Airlines
Tue, 2 Jun - Tue, 9 Jun
American Airlines Logo
4:30 p.m. - 11:44 a.m.
STL
-
YUL
18h 14m
1 stop
American Airlines Logo
12:30 p.m. - 11:56 p.m.
YUL
-
STL
12h 26m
1 stop
C$ 653American Airlines
Tue, 5 May - Tue, 12 May
American Airlines Logo
4:30 p.m. - 11:44 a.m.
STL
-
YUL
18h 14m
1 stop
American Airlines Logo
1:03 p.m. - 11:56 p.m.
YUL
-
STL
11h 53m
2 stops
C$ 665American Airlines
Tue, 5 May - Tue, 12 May
American Airlines Logo
6:06 a.m. - 4:44 p.m.
STL
-
YUL
9h 38m
1 stop
American Airlines Logo
12:30 p.m. - 11:51 p.m.
YUL
-
STL
12h 21m
1 stop
C$ 682American Airlines
Wed, 26 Aug - Wed, 2 Sep
Air Canada Logo
1:05 p.m. - 4:40 p.m.
STL
-
YUL
2h 35mdirect
Air Canada Logo
6:30 p.m. - 8:25 p.m.
YUL
-
STL
2h 55mdirect
C$ 690Air Canada
Tue, 5 May - Tue, 12 May
Air Canada Logo
1:05 p.m. - 4:40 p.m.
STL
-
YUL
2h 35mdirect
Air Canada Logo
6:30 p.m. - 8:25 p.m.
YUL
-
STL
2h 55mdirect
C$ 691Air Canada
Wed, 17 Jun - Wed, 24 Jun
Multiple Airlines Logo
4:19 p.m. - 12:25 a.m.
STL
-
YUL
31h 06m
2 stops
Multiple Airlines Logo
6:00 a.m. - 9:32 a.m.
YUL
-
STL
4h 32m
1 stop
C$ 704Multiple Airlines
Tue, 2 Jun - Tue, 9 Jun
Multiple Airlines Logo
6:33 p.m. - 2:08 p.m.
STL
-
YUL
42h 35m
2 stops
Multiple Airlines Logo
6:51 p.m. - 8:55 a.m.
YUL
-
STL
15h 04m
1 stop
C$ 705Multiple Airlines
Tue, 12 May - Tue, 19 May
Air Canada Logo
1:05 p.m. - 4:40 p.m.
STL
-
YUL
2h 35mdirect
Air Canada Logo
7:00 a.m. - 12:06 p.m.
YUL
-
STL
6h 06m
1 stop
C$ 709Air Canada
Tue, 5 May - Tue, 12 May
Air Canada Logo
1:05 p.m. - 4:40 p.m.
STL
-
YUL
2h 35mdirect
Air Canada Logo
10:40 a.m. - 8:09 p.m.
YUL
-
STL
10h 29m
2 stops
C$ 716Air Canada
Tue, 5 May - Tue, 12 May

American Airlines flights from St. Louis to Montreal

Our best American Airlines deals on St. Louis to Montreal flight tickets
American Airlines
2 Jun
STL7:50 p.m.Lambert-St Louis
14h 54m
1 stop
YUL11:44 a.m.Montreal Pierre Elliott Trudeau Intl
9 Jun
YUL5:33 p.m.Montreal Pierre Elliott Trudeau Intl
15h 58m
1 stop
STL8:31 a.m.Lambert-St Louis
C$ 641
American Airlines
5 May
STL4:30 p.m.Lambert-St Louis
18h 14m
1 stop
YUL11:44 a.m.Montreal Pierre Elliott Trudeau Intl
12 May
YUL12:30 p.m.Montreal Pierre Elliott Trudeau Intl
12h 26m
1 stop
STL11:56 p.m.Lambert-St Louis
C$ 653
American Airlines
5 May
STL4:30 p.m.Lambert-St Louis
18h 14m
1 stop
YUL11:44 a.m.Montreal Pierre Elliott Trudeau Intl
12 May
YUL1:03 p.m.Montreal Pierre Elliott Trudeau Intl
11h 53m
2 stops
STL11:56 p.m.Lambert-St Louis
C$ 665

Delta flights from St. Louis to Montreal

Our best Delta deals on St. Louis to Montreal flight tickets
Delta
16 May
STL6:04 p.m.Lambert-St Louis
4h 09m
1 stop
YUL11:13 p.m.Montreal Pierre Elliott Trudeau Intl
27 May
YUL9:30 a.m.Montreal Pierre Elliott Trudeau Intl
12h 09m
1 stop
STL8:39 p.m.Lambert-St Louis
C$ 853
Delta
22 Apr
STL6:48 a.m.Lambert-St Louis
11h 03m
2 stops
YUL6:51 p.m.Montreal Pierre Elliott Trudeau Intl
26 Apr
YUL12:55 p.m.Montreal Pierre Elliott Trudeau Intl
11h 18m
2 stops
STL11:13 p.m.Lambert-St Louis
C$ 2,139
Delta
25 Apr
STL3:25 p.m.Lambert-St Louis
6h 43m
2 stops
YUL11:08 p.m.Montreal Pierre Elliott Trudeau Intl
30 Apr
YUL2:29 p.m.Montreal Pierre Elliott Trudeau Intl
7h 15m
2 stops
STL8:44 p.m.Lambert-St Louis
C$ 2,610

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 19 April 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

Cheapest round-trip

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 2/6

7:50 p.m.-11:44 a.m.

1 stop14h 54m

Montreal Pierre Elliott Trudeau Intl

Tue 9/6

5:33 p.m.-8:31 a.m.

1 stop15h 58m

C$ 641

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

Tue 12/5

12:30 p.m.-11:56 p.m.

1 stop12h 26m

C$ 653

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

Tue 12/5

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

2 stops11h 53m

C$ 665

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Wed 26/8

6:06 a.m.-4:44 p.m.

1 stop9h 38m

Montreal Pierre Elliott Trudeau Intl

Wed 2/9

12:30 p.m.-11:51 p.m.

1 stop12h 21m

C$ 682
Quickest round-trip

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 5/5

1:05 p.m.-4:40 p.m.

Nonstop2h 35m

Montreal Pierre Elliott Trudeau Intl

Tue 12/5

6:30 p.m.-8:25 p.m.

Nonstop2h 55m

C$ 690

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Wed 17/6

1:05 p.m.-4:40 p.m.

Nonstop2h 35m

Montreal Pierre Elliott Trudeau Intl

Wed 24/6

6:30 p.m.-8:25 p.m.

Nonstop2h 55m

C$ 691

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 2/6

4:19 p.m.-12:25 a.m.

2 stops31h 06m

Montreal Pierre Elliott Trudeau Intl

Tue 9/6

6:00 a.m.-9:32 a.m.

1 stop4h 32m

C$ 704

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 12/5

6:33 p.m.-2:08 p.m.

2 stops42h 35m

Montreal Pierre Elliott Trudeau Intl

Tue 19/5

6:51 p.m.-8:55 a.m.

1 stop15h 04m

C$ 705

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 5/5

1:05 p.m.-4:40 p.m.

Nonstop2h 35m

Montreal Pierre Elliott Trudeau Intl

Tue 12/5

7:00 a.m.-12:06 p.m.

1 stop6h 06m

C$ 709

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 5/5

1:05 p.m.-4:40 p.m.

Nonstop2h 35m

Montreal Pierre Elliott Trudeau Intl

Tue 12/5

10:40 a.m.-8:09 p.m.

2 stops10h 29m

C$ 716

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 typical price of a round-trip flight between St. Louis and Montreal?

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?

No. A direct flight is the cheapest option for a flight between St. Louis to Montreal.

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 32m

Direct flights

Every day

Airports in Montreal

2 airports
The fastest flight from St. Louis to Montreal takes 2h 32m
Direct flights go from St. Louis to Montreal every day.
There are 2 airports in Montreal. From St. Louis there are direct flights to Montreal Pierre Elliott Trudeau Intl (YUL).
Search flight deals

Frequently asked questions about flying from St. Louis to Montreal

  • 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 32m, 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