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Cheap flights from St. Louis to Montreal from C$ 288

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 22/10. 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
7:27 a.m. - 4:53 p.m.
STL
-
YUL
8h 26m
1 stop
American Airlines Logo
12:32 p.m. - 12:27 a.m.
YUL
-
STL
12h 55m
1 stop
C$ 676American Airlines
Sat, 12 Sep - Sat, 19 Sep
American Airlines Logo
5:27 p.m. - 11:44 a.m.
STL
-
YUL
17h 17m
1 stop
American Airlines Logo
5:34 p.m. - 10:51 a.m.
YUL
-
STL
18h 17m
1 stop
C$ 680American Airlines
Mon, 19 Oct - Fri, 23 Oct
American Airlines Logo
5:27 p.m. - 11:44 a.m.
STL
-
YUL
17h 17m
1 stop
American Airlines Logo
12:30 p.m. - 9:08 p.m.
YUL
-
STL
9h 38m
1 stop
C$ 680American Airlines
Mon, 19 Oct - Thu, 22 Oct
American Airlines Logo
8:07 p.m. - 11:43 a.m.
STL
-
YUL
14h 36m
1 stop
American Airlines Logo
12:30 p.m. - 12:14 a.m.
YUL
-
STL
12h 44m
1 stop
C$ 680American Airlines
Wed, 26 Aug - Wed, 2 Sep
American Airlines Logo
7:29 a.m. - 4:52 p.m.
STL
-
YUL
8h 23m
1 stop
American Airlines Logo
12:30 p.m. - 11:58 p.m.
YUL
-
STL
12h 28m
1 stop
C$ 684American Airlines
Sat, 17 Oct - Sat, 24 Oct
American Airlines Logo
6:00 a.m. - 4:50 p.m.
STL
-
YUL
9h 50m
1 stop
American Airlines Logo
5:34 p.m. - 10:20 a.m.
YUL
-
STL
17h 46m
1 stop
C$ 684American Airlines
Mon, 7 Sep - Wed, 16 Sep
American Airlines Logo
5:00 a.m. - 4:52 p.m.
STL
-
YUL
10h 52m
1 stop
American Airlines Logo
5:34 p.m. - 10:51 a.m.
YUL
-
STL
18h 17m
1 stop
C$ 686American Airlines
Sat, 17 Oct - Mon, 26 Oct
American Airlines Logo
8:07 p.m. - 11:43 a.m.
STL
-
YUL
14h 36m
1 stop
American Airlines Logo
12:30 p.m. - 12:14 a.m.
YUL
-
STL
12h 44m
1 stop
C$ 689American Airlines
Wed, 26 Aug - Wed, 2 Sep
American Airlines Logo
8:06 p.m. - 4:50 p.m.
STL
-
YUL
19h 44m
1 stop
American Airlines Logo
5:34 p.m. - 10:20 a.m.
YUL
-
STL
17h 46m
1 stop
C$ 689American Airlines
Sat, 5 Sep - Tue, 8 Sep
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$ 689American Airlines
Tue, 18 Aug - Fri, 21 Aug

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United Airlines flights from St. Louis to Montreal

Our best United Airlines deals on St. Louis to Montreal flight tickets
United Airlines
13 Oct
STL8:00 a.m.Lambert-St Louis
25h 40m
1 stop
YUL10:40 a.m.Montreal Pierre Elliott Trudeau Intl
17 Oct
YUL9:45 a.m.Montreal Pierre Elliott Trudeau Intl
12h 36m
1 stop
STL9:21 p.m.Lambert-St Louis
C$ 835
United Airlines
10 Aug
STL12:10 p.m.Lambert-St Louis
2h 32m
YUL3:42 p.m.Montreal Pierre Elliott Trudeau Intl
15 Aug
YUL8:40 a.m.Montreal Pierre Elliott Trudeau Intl
7h 51m
1 stop
STL3:31 p.m.Lambert-St Louis
C$ 1,508
United Airlines
5 Aug
STL6:01 a.m.Lambert-St Louis
10h 23m
1 stop
YUL5:24 p.m.Montreal Pierre Elliott Trudeau Intl
10 Aug
YUL4:55 p.m.Montreal Pierre Elliott Trudeau Intl
2h 47m
STL6:42 p.m.Lambert-St Louis
C$ 1,596

American Airlines flights from St. Louis to Montreal

Our best American Airlines deals on St. Louis to Montreal flight tickets
American Airlines
12 Sep
STL7:27 a.m.Lambert-St Louis
8h 26m
1 stop
YUL4:53 p.m.Montreal Pierre Elliott Trudeau Intl
19 Sep
YUL12:32 p.m.Montreal Pierre Elliott Trudeau Intl
12h 55m
1 stop
STL12:27 a.m.Lambert-St Louis
C$ 676
American Airlines
19 Oct
STL5:27 p.m.Lambert-St Louis
17h 17m
1 stop
YUL11:44 a.m.Montreal Pierre Elliott Trudeau Intl
22 Oct
YUL12:30 p.m.Montreal Pierre Elliott Trudeau Intl
9h 38m
1 stop
STL9:08 p.m.Lambert-St Louis
C$ 680
American Airlines
7 Sep
STL6:00 a.m.Lambert-St Louis
9h 50m
1 stop
YUL4:50 p.m.Montreal Pierre Elliott Trudeau Intl
16 Sep
YUL5:34 p.m.Montreal Pierre Elliott Trudeau Intl
17h 46m
1 stop
STL10:20 a.m.Lambert-St Louis
C$ 684

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 29 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

Sat 12/9

7:27 a.m.-4:53 p.m.

1 stop8h 26m

Montreal Pierre Elliott Trudeau Intl

Sat 19/9

12:32 p.m.-12:27 a.m.

1 stop12h 55m

C$ 676

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 19/10

5:27 p.m.-11:44 a.m.

1 stop17h 17m

Montreal Pierre Elliott Trudeau Intl

Fri 23/10

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

1 stop18h 17m

C$ 680

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 19/10

5:27 p.m.-11:44 a.m.

1 stop17h 17m

Montreal Pierre Elliott Trudeau Intl

Thu 22/10

12:30 p.m.-9:08 p.m.

1 stop9h 38m

C$ 680

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Wed 26/8

8:07 p.m.-11:43 a.m.

1 stop14h 36m

Montreal Pierre Elliott Trudeau Intl

Wed 2/9

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

1 stop12h 44m

C$ 680
Quickest round-trip

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sat 17/10

7:29 a.m.-4:52 p.m.

1 stop8h 23m

Montreal Pierre Elliott Trudeau Intl

Sat 24/10

12:30 p.m.-11:58 p.m.

1 stop12h 28m

C$ 684

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 7/9

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

1 stop9h 50m

Montreal Pierre Elliott Trudeau Intl

Wed 16/9

5:34 p.m.-10:20 a.m.

1 stop17h 46m

C$ 684

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sat 17/10

5:00 a.m.-4:52 p.m.

1 stop10h 52m

Montreal Pierre Elliott Trudeau Intl

Mon 26/10

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

1 stop18h 17m

C$ 686

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Wed 26/8

8:07 p.m.-11:43 a.m.

1 stop14h 36m

Montreal Pierre Elliott Trudeau Intl

Wed 2/9

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

1 stop12h 44m

C$ 689

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sat 5/9

8:06 p.m.-4:50 p.m.

1 stop19h 44m

Montreal Pierre Elliott Trudeau Intl

Tue 8/9

5:34 p.m.-10:20 a.m.

1 stop17h 46m

C$ 689

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$ 689

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?

Prices are currently typical for flights on this route.

Typical prices usually range from C$ 652 to C$ 1,084.
The lowest price recently found on this route was C$ 676.

What is the cheapest month to fly to Montreal?

The cheapest month to fly to Montreal from St. Louis is in February. Flight prices, which tend to average around C$ 714, are often lower during this time because this is during the off-season. If you aren’t able to travel during the month of February, then book flights to Montreal from St. Louis during August instead. Flights to Montreal in August, while not as cheap as those in February, still average around C$ 752.

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