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Cheap flights from St. Louis to Montreal from C$ 262

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 7/10. 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
6:00 a.m. - 4:50 p.m.
STL
-
YUL
9h 50m
1 stop
American Airlines Logo
5:34 p.m. - 8:24 a.m.
YUL
-
STL
15h 50m
1 stop
C$ 604American Airlines
Tue, 18 Aug - Fri, 21 Aug
American Airlines Logo
6:00 a.m. - 4:50 p.m.
STL
-
YUL
9h 50m
1 stop
American Airlines Logo
12:30 p.m. - 12:14 a.m.
YUL
-
STL
12h 44m
1 stop
C$ 611American Airlines
Tue, 25 Aug - Tue, 1 Sep
Air Canada Logo
12:10 p.m. - 3:42 p.m.
STL
-
YUL
2h 32mdirect
Air Canada Logo
4:55 p.m. - 6:42 p.m.
YUL
-
STL
2h 47mdirect
C$ 740Air Canada
Thu, 20 Aug - Mon, 24 Aug
Air Canada Logo
12:10 p.m. - 3:42 p.m.
STL
-
YUL
2h 32mdirect
Air Canada Logo
4:55 p.m. - 6:42 p.m.
YUL
-
STL
2h 47mdirect
C$ 741Air Canada
Thu, 20 Aug - Mon, 24 Aug
American Airlines Logo
4:15 p.m. - 9:52 a.m.
STL
-
YUL
16h 37m
1 stop
American Airlines Logo
5:34 p.m. - 10:51 a.m.
YUL
-
STL
18h 17m
1 stop
C$ 747American Airlines
Mon, 19 Oct - Fri, 23 Oct
Air Canada Logo
12:10 p.m. - 3:42 p.m.
STL
-
YUL
2h 32mdirect
Air Canada Logo
4:55 p.m. - 6:42 p.m.
YUL
-
STL
2h 47mdirect
C$ 749Air Canada
Sat, 8 Aug - Mon, 10 Aug
Multiple Airlines Logo
4:57 p.m. - 6:15 p.m.
STL
-
YUL
24h 18m
2 stops
Multiple Airlines Logo
6:51 p.m. - 11:58 p.m.
YUL
-
STL
6h 07m
1 stop
C$ 751Multiple Airlines
Mon, 10 Aug - Thu, 13 Aug
Air Canada Logo
8:55 a.m. - 3:22 p.m.
STL
-
YUL
5h 27m
1 stop
Air Canada Logo
4:55 p.m. - 6:42 p.m.
YUL
-
STL
2h 47mdirect
C$ 753Air Canada
Sat, 8 Aug - Mon, 10 Aug
American Airlines Logo
8:34 a.m. - 10:53 p.m.
STL
-
YUL
13h 19m
1 stop
American Airlines Logo
12:30 p.m. - 12:14 a.m.
YUL
-
STL
12h 44m
1 stop
C$ 756American Airlines
Thu, 3 Sep - Tue, 8 Sep
Delta Logo
5:30 p.m. - 8:35 a.m.
STL
-
YUL
14h 05m
1 stop
Delta Logo
9:30 a.m. - 8:06 p.m.
YUL
-
STL
11h 36m
1 stop
C$ 757Delta
Tue, 8 Sep - Tue, 15 Sep

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WestJet flights from St. Louis to Montreal

Our best WestJet deals on St. Louis to Montreal flight tickets
WestJet
4 Dec
STL9:00 a.m.Lambert-St Louis
28h 12m
2 stops
YUL2:12 p.m.Montreal Pierre Elliott Trudeau Intl
6 Dec
YUL6:00 a.m.Montreal Pierre Elliott Trudeau Intl
4h 36m
1 stop
STL9:36 a.m.Lambert-St Louis
C$ 832
WestJet
3 Sep
STL7:00 a.m.Lambert-St Louis
15h 52m
1 stop
YUL11:52 p.m.Montreal Pierre Elliott Trudeau Intl
8 Sep
YUL7:00 a.m.Montreal Pierre Elliott Trudeau Intl
6h 32m
1 stop
STL12:32 p.m.Lambert-St Louis
C$ 874
WestJet
18 Aug
STL5:34 p.m.Lambert-St Louis
5h 06m
1 stop
YUL11:40 p.m.Montreal Pierre Elliott Trudeau Intl
21 Aug
YUL6:51 p.m.Montreal Pierre Elliott Trudeau Intl
6h 07m
1 stop
STL11:58 p.m.Lambert-St Louis
C$ 882

American Airlines flights from St. Louis to Montreal

Our best American Airlines deals on St. Louis to Montreal flight tickets
American Airlines
18 Aug
STL6:00 a.m.Lambert-St Louis
9h 50m
1 stop
YUL4:50 p.m.Montreal Pierre Elliott Trudeau Intl
21 Aug
YUL5:34 p.m.Montreal Pierre Elliott Trudeau Intl
15h 50m
1 stop
STL8:24 a.m.Lambert-St Louis
C$ 604
American Airlines
25 Aug
STL6:00 a.m.Lambert-St Louis
9h 50m
1 stop
YUL4:50 p.m.Montreal Pierre Elliott Trudeau Intl
1 Sep
YUL12:30 p.m.Montreal Pierre Elliott Trudeau Intl
12h 44m
1 stop
STL12:14 a.m.Lambert-St Louis
C$ 611
American Airlines
19 Oct
STL4:15 p.m.Lambert-St Louis
16h 37m
1 stop
YUL9:52 a.m.Montreal Pierre Elliott Trudeau Intl
23 Oct
YUL5:34 p.m.Montreal Pierre Elliott Trudeau Intl
18h 17m
1 stop
STL10:51 a.m.Lambert-St Louis
C$ 747

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 13 July 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 18/8

6:00 a.m.-4:50 p.m.

1 stop9h 50m

Montreal Pierre Elliott Trudeau Intl

Fri 21/8

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

1 stop15h 50m

C$ 604

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 25/8

6:00 a.m.-4:50 p.m.

1 stop9h 50m

Montreal Pierre Elliott Trudeau Intl

Tue 1/9

12:30 p.m.-12:14 a.m.

1 stop12h 44m

C$ 611
Quickest round-trip

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 20/8

12:10 p.m.-3:42 p.m.

Nonstop2h 32m

Montreal Pierre Elliott Trudeau Intl

Mon 24/8

4:55 p.m.-6:42 p.m.

Nonstop2h 47m

C$ 740

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 20/8

12:10 p.m.-3:42 p.m.

Nonstop2h 32m

Montreal Pierre Elliott Trudeau Intl

Mon 24/8

4:55 p.m.-6:42 p.m.

Nonstop2h 47m

C$ 741

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 19/10

4:15 p.m.-9:52 a.m.

1 stop16h 37m

Montreal Pierre Elliott Trudeau Intl

Fri 23/10

5:34 p.m.-10:51 a.m.

1 stop18h 17m

C$ 747

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sat 8/8

12:10 p.m.-3:42 p.m.

Nonstop2h 32m

Montreal Pierre Elliott Trudeau Intl

Mon 10/8

4:55 p.m.-6:42 p.m.

Nonstop2h 47m

C$ 749

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 10/8

4:57 p.m.-6:15 p.m.

2 stops24h 18m

Montreal Pierre Elliott Trudeau Intl

Thu 13/8

6:51 p.m.-11:58 p.m.

1 stop6h 07m

C$ 751

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sat 8/8

8:55 a.m.-3:22 p.m.

1 stop5h 27m

Montreal Pierre Elliott Trudeau Intl

Mon 10/8

4:55 p.m.-6:42 p.m.

Nonstop2h 47m

C$ 753

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 3/9

8:34 a.m.-10:53 p.m.

1 stop13h 19m

Montreal Pierre Elliott Trudeau Intl

Tue 8/9

12:30 p.m.-12:14 a.m.

1 stop12h 44m

C$ 756

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 8/9

5:30 p.m.-8:35 a.m.

1 stop14h 05m

Montreal Pierre Elliott Trudeau Intl

Tue 15/9

9:30 a.m.-8:06 p.m.

1 stop11h 36m

C$ 757

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 month to fly to Montreal?

The cheapest month to fly to Montreal from St. Louis is in August. Flight prices, which tend to average around C$ 364, are often lower during this time because this is during the off-season. If you aren’t able to travel during the month of August, then book flights to Montreal from St. Louis during October instead. Flights to Montreal in October, while not as cheap as those in August, still average around C$ 392.

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 St. Louis to Montreal flights?

There is only 1 cabin class available to choose from on 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.

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).
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 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