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Cheap flights from St. Louis to Montreal from C$ 245

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 12/5. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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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.
Multiple Airlines Logo
8:23 p.m. - 2:08 p.m.
STL
-
YUL
40h 45m
2 stops
Multiple Airlines Logo
4:35 p.m. - 11:19 p.m.
YUL
-
STL
7h 44m
1 stop
C$ 584Multiple Airlines
Wed, 29 Apr - Sun, 3 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. - 11:46 p.m.
YUL
-
STL
11h 43m
2 stops
C$ 637American Airlines
Wed, 29 Apr - Sat, 2 May
American Airlines Logo
8:54 a.m. - 9:37 p.m.
STL
-
YUL
11h 43m
2 stops
American Airlines Logo
1:03 p.m. - 11:46 p.m.
YUL
-
STL
11h 43m
2 stops
C$ 644American Airlines
Wed, 29 Apr - Sat, 2 May
American Airlines Logo
8:03 p.m. - 11:44 a.m.
STL
-
YUL
14h 41m
1 stop
American Airlines Logo
12:30 p.m. - 11:54 p.m.
YUL
-
STL
12h 24m
1 stop
C$ 676American Airlines
Sat, 16 May - Sat, 23 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. - 11:46 p.m.
YUL
-
STL
11h 43m
2 stops
C$ 690American Airlines
Sat, 25 Apr - Sat, 2 May
Multiple Airlines Logo
11:21 a.m. - 2:08 p.m.
STL
-
YUL
25h 47m
2 stops
Multiple Airlines Logo
6:00 a.m. - 9:29 a.m.
YUL
-
STL
4h 29m
1 stop
C$ 706Multiple Airlines
Thu, 30 Apr - Thu, 7 May
American Airlines Logo
3:24 p.m. - 10:58 p.m.
STL
-
YUL
6h 34m
1 stop
American Airlines Logo
12:30 p.m. - 10:19 p.m.
YUL
-
STL
10h 49m
1 stop
C$ 709American Airlines
Tue, 21 Apr - Tue, 28 Apr
American Airlines Logo
7:00 a.m. - 4:53 p.m.
STL
-
YUL
8h 53m
1 stop
American Airlines Logo
12:30 p.m. - 11:54 p.m.
YUL
-
STL
12h 24m
1 stop
C$ 717American Airlines
Thu, 28 May - Wed, 3 Jun
American Airlines Logo
5:21 p.m. - 11:44 a.m.
STL
-
YUL
17h 23m
1 stop
American Airlines Logo
7:45 a.m. - 12:35 p.m.
YUL
-
STL
5h 50m
1 stop
C$ 720American Airlines
Wed, 29 Apr - Sat, 2 May
Air Canada Logo
7:05 a.m. - 1:21 p.m.
STL
-
YUL
5h 16m
1 stop
Air Canada Logo
6:30 p.m. - 8:25 p.m.
YUL
-
STL
2h 55mdirect
C$ 730Air Canada
Sat, 16 May - Sat, 23 May

American Airlines flights from St. Louis to Montreal

Our best American Airlines deals on St. Louis to Montreal flight tickets
American Airlines
29 Apr
STL8:03 p.m.Lambert-St Louis
14h 41m
1 stop
YUL11:44 a.m.Montreal Pierre Elliott Trudeau Intl
2 May
YUL1:03 p.m.Montreal Pierre Elliott Trudeau Intl
11h 43m
2 stops
STL11:46 p.m.Lambert-St Louis
C$ 637
American Airlines
29 Apr
STL8:54 a.m.Lambert-St Louis
11h 43m
2 stops
YUL9:37 p.m.Montreal Pierre Elliott Trudeau Intl
2 May
YUL1:03 p.m.Montreal Pierre Elliott Trudeau Intl
11h 43m
2 stops
STL11:46 p.m.Lambert-St Louis
C$ 644
American Airlines
16 May
STL8:03 p.m.Lambert-St Louis
14h 41m
1 stop
YUL11:44 a.m.Montreal Pierre Elliott Trudeau Intl
23 May
YUL12:30 p.m.Montreal Pierre Elliott Trudeau Intl
12h 24m
1 stop
STL11:54 p.m.Lambert-St Louis
C$ 676

Air Canada flights from St. Louis to Montreal

Our best Air Canada deals on St. Louis to Montreal flight tickets
Air Canada
16 May
STL7:05 a.m.Lambert-St Louis
5h 16m
1 stop
YUL1:21 p.m.Montreal Pierre Elliott Trudeau Intl
23 May
YUL6:30 p.m.Montreal Pierre Elliott Trudeau Intl
2h 55m
STL8:25 p.m.Lambert-St Louis
C$ 730
Air Canada
16 May
STL7:05 a.m.Lambert-St Louis
7h 16m
2 stops
YUL3:21 p.m.Montreal Pierre Elliott Trudeau Intl
23 May
YUL6:30 p.m.Montreal Pierre Elliott Trudeau Intl
2h 55m
STL8:25 p.m.Lambert-St Louis
C$ 733
Air Canada
16 May
STL7:05 a.m.Lambert-St Louis
7h 16m
2 stops
YUL3:21 p.m.Montreal Pierre Elliott Trudeau Intl
23 May
YUL6:00 a.m.Montreal Pierre Elliott Trudeau Intl
7h 06m
1 stop
STL12:06 p.m.Lambert-St Louis
C$ 748

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 4 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

Wed 29/4

8:23 p.m.-2:08 p.m.

2 stops40h 45m

Montreal Pierre Elliott Trudeau Intl

Sun 3/5

4:35 p.m.-11:19 p.m.

1 stop7h 44m

C$ 584

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Wed 29/4

8:03 p.m.-11:44 a.m.

1 stop14h 41m

Montreal Pierre Elliott Trudeau Intl

Sat 2/5

1:03 p.m.-11:46 p.m.

2 stops11h 43m

C$ 637

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Wed 29/4

8:54 a.m.-9:37 p.m.

2 stops11h 43m

Montreal Pierre Elliott Trudeau Intl

Sat 2/5

1:03 p.m.-11:46 p.m.

2 stops11h 43m

C$ 644

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sat 16/5

8:03 p.m.-11:44 a.m.

1 stop14h 41m

Montreal Pierre Elliott Trudeau Intl

Sat 23/5

12:30 p.m.-11:54 p.m.

1 stop12h 24m

C$ 676

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sat 25/4

8:03 p.m.-11:44 a.m.

1 stop14h 41m

Montreal Pierre Elliott Trudeau Intl

Sat 2/5

1:03 p.m.-11:46 p.m.

2 stops11h 43m

C$ 690

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 30/4

11:21 a.m.-2:08 p.m.

2 stops25h 47m

Montreal Pierre Elliott Trudeau Intl

Thu 7/5

6:00 a.m.-9:29 a.m.

1 stop4h 29m

C$ 706

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 21/4

3:24 p.m.-10:58 p.m.

1 stop6h 34m

Montreal Pierre Elliott Trudeau Intl

Tue 28/4

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

1 stop10h 49m

C$ 709

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 28/5

7:00 a.m.-4:53 p.m.

1 stop8h 53m

Montreal Pierre Elliott Trudeau Intl

Wed 3/6

12:30 p.m.-11:54 p.m.

1 stop12h 24m

C$ 717

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Wed 29/4

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

1 stop17h 23m

Montreal Pierre Elliott Trudeau Intl

Sat 2/5

7:45 a.m.-12:35 p.m.

1 stop5h 50m

C$ 720
Quickest round-trip

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sat 16/5

7:05 a.m.-1:21 p.m.

1 stop5h 16m

Montreal Pierre Elliott Trudeau Intl

Sat 23/5

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

Nonstop2h 55m

C$ 730

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 31m

Direct flights

Every day

Airports in Montreal

2 airports
The fastest flight from St. Louis to Montreal takes 2h 31m
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).
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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 31m, 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