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Cheap flights from St. Louis to Montreal from C$ 271

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 18/10. 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
12:31 p.m. - 12:27 a.m.
YUL
-
STL
12h 56m
1 stop
C$ 680American Airlines
Tue, 1 Sep - Thu, 24 Sep
American Airlines Logo
9:32 a.m. - 9:44 p.m.
STL
-
YUL
11h 12m
2 stops
American Airlines Logo
12:31 p.m. - 12:27 a.m.
YUL
-
STL
12h 56m
1 stop
C$ 694American Airlines
Tue, 1 Sep - Thu, 24 Sep
WestJet Logo
6:00 a.m. - 2:12 p.m.
STL
-
YUL
31h 12m
2 stops
WestJet Logo
6:00 a.m. - 1:09 p.m.
YUL
-
STL
8h 09m
1 stop
C$ 730WestJet
Fri, 6 Nov - Sun, 8 Nov
WestJet Logo
6:40 a.m. - 11:58 a.m.
STL
-
YUL
4h 18m
1 stop
WestJet Logo
4:15 p.m. - 4:23 p.m.
YUL
-
STL
25h 08m
2 stops
C$ 732WestJet
Tue, 27 Oct - Tue, 27 Oct
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$ 740American Airlines
Thu, 13 Aug - Thu, 20 Aug
American Airlines Logo
2:55 p.m. - 9:46 a.m.
STL
-
YUL
17h 51m
1 stop
American Airlines Logo
5:34 p.m. - 8:24 a.m.
YUL
-
STL
15h 50m
1 stop
C$ 753American Airlines
Tue, 18 Aug - Fri, 21 Aug
Delta Logo
5:30 p.m. - 8:33 a.m.
STL
-
YUL
14h 03m
1 stop
Delta Logo
9:30 a.m. - 8:15 p.m.
YUL
-
STL
11h 45m
1 stop
C$ 763Delta
Mon, 19 Oct - Wed, 21 Oct
Multiple Airlines Logo
6:17 p.m. - 2:08 p.m.
STL
-
YUL
18h 51m
2 stops
Multiple Airlines Logo
5:10 p.m. - 8:42 p.m.
YUL
-
STL
4h 32m
1 stop
C$ 770Multiple Airlines
Fri, 21 Aug - Mon, 24 Aug
Delta Logo
5:30 p.m. - 8:33 a.m.
STL
-
YUL
14h 03m
1 stop
Delta Logo
9:30 a.m. - 9:16 p.m.
YUL
-
STL
12h 46m
2 stops
C$ 775Delta
Mon, 19 Oct - Wed, 21 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. - 8:24 a.m.
YUL
-
STL
15h 50m
1 stop
C$ 791American Airlines
Tue, 18 Aug - Fri, 21 Aug

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WestJet flights from St. Louis to Montreal

Our best WestJet deals on St. Louis to Montreal flight tickets
WestJet
6 Nov
STL6:00 a.m.Lambert-St Louis
31h 12m
2 stops
YUL2:12 p.m.Montreal Pierre Elliott Trudeau Intl
8 Nov
YUL6:00 a.m.Montreal Pierre Elliott Trudeau Intl
8h 09m
1 stop
STL1:09 p.m.Lambert-St Louis
C$ 730
WestJet
27 Oct
STL6:40 a.m.Lambert-St Louis
4h 18m
1 stop
YUL11:58 a.m.Montreal Pierre Elliott Trudeau Intl
27 Oct
YUL4:15 p.m.Montreal Pierre Elliott Trudeau Intl
25h 08m
2 stops
STL4:23 p.m.Lambert-St Louis
C$ 732
WestJet
6 Nov
STL5:28 p.m.Lambert-St Louis
5h 31m
1 stop
YUL11:59 p.m.Montreal Pierre Elliott Trudeau Intl
8 Nov
YUL6:50 p.m.Montreal Pierre Elliott Trudeau Intl
5h 58m
1 stop
STL11:48 p.m.Lambert-St Louis
C$ 879

British Airways flights from St. Louis to Montreal

Our best British Airways deals on St. Louis to Montreal flight tickets
British Airways
22 Aug
STL5:13 p.m.Lambert-St Louis
17h 30m
1 stop
YUL11:43 a.m.Montreal Pierre Elliott Trudeau Intl
24 Aug
YUL5:34 p.m.Montreal Pierre Elliott Trudeau Intl
15h 50m
1 stop
STL8:24 a.m.Lambert-St Louis
C$ 848
British Airways
20 Aug
STL4:54 p.m.Lambert-St Louis
17h 49m
1 stop
YUL11:43 a.m.Montreal Pierre Elliott Trudeau Intl
24 Aug
YUL5:34 p.m.Montreal Pierre Elliott Trudeau Intl
15h 50m
1 stop
STL8:24 a.m.Lambert-St Louis
C$ 859

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 20 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 1/9

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

1 stop9h 50m

Montreal Pierre Elliott Trudeau Intl

Thu 24/9

12:31 p.m.-12:27 a.m.

1 stop12h 56m

C$ 680

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 1/9

9:32 a.m.-9:44 p.m.

2 stops11h 12m

Montreal Pierre Elliott Trudeau Intl

Thu 24/9

12:31 p.m.-12:27 a.m.

1 stop12h 56m

C$ 694

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Fri 6/11

6:00 a.m.-2:12 p.m.

2 stops31h 12m

Montreal Pierre Elliott Trudeau Intl

Sun 8/11

6:00 a.m.-1:09 p.m.

1 stop8h 09m

C$ 730

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 27/10

6:40 a.m.-11:58 a.m.

1 stop4h 18m

Montreal Pierre Elliott Trudeau Intl

Tue 27/10

4:15 p.m.-4:23 p.m.

2 stops25h 08m

C$ 732
Quickest round-trip

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 13/8

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

1 stop9h 50m

Montreal Pierre Elliott Trudeau Intl

Thu 20/8

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

1 stop12h 44m

C$ 740

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 18/8

2:55 p.m.-9:46 a.m.

1 stop17h 51m

Montreal Pierre Elliott Trudeau Intl

Fri 21/8

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

1 stop15h 50m

C$ 753

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 19/10

5:30 p.m.-8:33 a.m.

1 stop14h 03m

Montreal Pierre Elliott Trudeau Intl

Wed 21/10

9:30 a.m.-8:15 p.m.

1 stop11h 45m

C$ 763

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Fri 21/8

6:17 p.m.-2:08 p.m.

2 stops18h 51m

Montreal Pierre Elliott Trudeau Intl

Mon 24/8

5:10 p.m.-8:42 p.m.

1 stop4h 32m

C$ 770

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 19/10

5:30 p.m.-8:33 a.m.

1 stop14h 03m

Montreal Pierre Elliott Trudeau Intl

Wed 21/10

9:30 a.m.-9:16 p.m.

2 stops12h 46m

C$ 775

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$ 791

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 February. Flight prices, which tend to average around C$ 709, 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$ 798.

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