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Cheap flights from St. Louis to Montreal from C$ 298

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
5:13 p.m. - 11:43 a.m.STL  Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl
17h 30m1 stop Chicago O'Hare Intl
American Airlines Logo
12:31 p.m. - 8:44 p.m.YUL  Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis
9h 13m1 stop Chicago O'Hare Intl
C$ 681American Airlines
Sat, 5 Sep - Fri, 11 Sep
American Airlines Logo
7:27 a.m. - 4:53 p.m.STL  Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl
8h 26m1 stop Chicago O'Hare Intl
American Airlines Logo
12:31 p.m. - 12:27 a.m.YUL  Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis
12h 56m1 stop Chicago O'Hare Intl
C$ 684American Airlines
Thu, 17 Sep - Thu, 24 Sep
American Airlines Logo
5:00 a.m. - 4:52 p.m.STL  Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl
10h 52m1 stop Chicago O'Hare Intl
American Airlines Logo
12:30 p.m. - 12:09 a.m.YUL  Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis
12h 39m1 stop Chicago O'Hare Intl
C$ 720American Airlines
Sat, 17 Oct - Wed, 21 Oct
American Airlines Logo
5:27 p.m. - 11:44 a.m.STL  Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl
17h 17m1 stop Chicago O'Hare Intl
American Airlines Logo
5:34 p.m. - 10:50 a.m.YUL  Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis
18h 16m1 stop Chicago O'Hare Intl
C$ 738American Airlines
Tue, 13 Oct - Fri, 16 Oct
American Airlines Logo
5:18 p.m. - 11:44 a.m.STL  Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl
17h 26m1 stop Chicago O'Hare Intl
American Airlines Logo
5:34 p.m. - 10:18 a.m.YUL  Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis
17h 44m1 stop Chicago O'Hare Intl
C$ 745American Airlines
Fri, 18 Sep - Tue, 22 Sep
American Airlines Logo
9:32 a.m. - 9:44 p.m.STL  Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl
11h 12m2 stops Chicago O'Hare Intl Philadelphia
American Airlines Logo
5:34 p.m. - 10:18 a.m.YUL  Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis
17h 44m1 stop Chicago O'Hare Intl
C$ 748American Airlines
Tue, 1 Sep - Tue, 8 Sep
American Airlines Logo
6:00 a.m. - 4:50 p.m.STL  Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl
9h 50m1 stop Chicago O'Hare Intl
American Airlines Logo
5:34 p.m. - 8:24 a.m.YUL  Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis
15h 50m1 stop Chicago O'Hare Intl
C$ 764American Airlines
Tue, 1 Sep - Fri, 4 Sep
American Airlines Logo
9:32 a.m. - 9:44 p.m.STL  Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl
11h 12m2 stops Chicago O'Hare Intl Philadelphia
American Airlines Logo
5:34 p.m. - 8:24 a.m.YUL  Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis
15h 50m1 stop Chicago O'Hare Intl
C$ 778American Airlines
Tue, 1 Sep - Fri, 4 Sep
Multiple Airlines Logo
2:29 p.m. - 2:08 p.m.STL  Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl
22h 39m2 stops Atlanta Hartsfield-Jackson New York LaGuardia
Multiple Airlines Logo
6:47 p.m. - 11:42 p.m.YUL  Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis
5h 55m1 stop Atlanta Hartsfield-Jackson
C$ 790Multiple Airlines
Wed, 9 Sep - Wed, 16 Sep
American Airlines Logo
2:55 p.m. - 9:46 a.m.STL  Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl
17h 51m1 stop New York LaGuardia
American Airlines Logo
12:31 p.m. - 12:27 a.m.YUL  Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis
12h 56m1 stop Chicago O'Hare Intl
C$ 792American Airlines
Tue, 1 Sep - Thu, 17 Sep

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WestJet flights from St. Louis to Montreal

Our best WestJet deals on St. Louis to Montreal flight tickets
WestJet
15 Sep
STL4:59 p.m.Lambert-St Louis
23h 37m
1 stop
YUL5:36 p.m.Montreal Pierre Elliott Trudeau Intl
16 Sep
YUL7:43 p.m.Montreal Pierre Elliott Trudeau Intl
25h 23m
1 stop
STL8:06 p.m.Lambert-St Louis
C$ 849
WestJet
15 Sep
STL4:59 p.m.Lambert-St Louis
23h 37m
1 stop
YUL5:36 p.m.Montreal Pierre Elliott Trudeau Intl
16 Sep
YUL8:00 p.m.Montreal Pierre Elliott Trudeau Intl
14h 00m
2 stops
STL9:00 a.m.Lambert-St Louis
C$ 851
WestJet
15 Sep
STL5:59 p.m.Lambert-St Louis
4h 28m
1 stop
YUL11:27 p.m.Montreal Pierre Elliott Trudeau Intl
16 Sep
YUL6:47 p.m.Montreal Pierre Elliott Trudeau Intl
5h 55m
1 stop
STL11:42 p.m.Lambert-St Louis
C$ 858

American Airlines flights from St. Louis to Montreal

Our best American Airlines deals on St. Louis to Montreal flight tickets
American Airlines
5 Sep
STL5:13 p.m.Lambert-St Louis
17h 30m
1 stop
YUL11:43 a.m.Montreal Pierre Elliott Trudeau Intl
11 Sep
YUL12:31 p.m.Montreal Pierre Elliott Trudeau Intl
9h 13m
1 stop
STL8:44 p.m.Lambert-St Louis
C$ 681
American Airlines
17 Sep
STL7:27 a.m.Lambert-St Louis
8h 26m
1 stop
YUL4:53 p.m.Montreal Pierre Elliott Trudeau Intl
24 Sep
YUL12:31 p.m.Montreal Pierre Elliott Trudeau Intl
12h 56m
1 stop
STL12:27 a.m.Lambert-St Louis
C$ 684
American Airlines
17 Oct
STL5:00 a.m.Lambert-St Louis
10h 52m
1 stop
YUL4:52 p.m.Montreal Pierre Elliott Trudeau Intl
21 Oct
YUL12:30 p.m.Montreal Pierre Elliott Trudeau Intl
12h 39m
1 stop
STL12:09 a.m.Lambert-St Louis
C$ 720

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 7 August 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 Lambert-St Louis - YUL Montreal Pierre Elliott Trudeau Intl

STLYUL

Lambert-St Louis

Sat 5/9

5:13 p.m.-11:43 a.m.

1 stop17h 30m

Montreal Pierre Elliott Trudeau Intl

Fri 11/9

12:31 p.m.-8:44 p.m.

1 stop9h 13m

C$ 681
Quickest round-trip

St. LouisMontreal

STL Lambert-St Louis - YUL Montreal Pierre Elliott Trudeau Intl

STLYUL

Lambert-St Louis

Thu 17/9

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

1 stop8h 26m

Montreal Pierre Elliott Trudeau Intl

Thu 24/9

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

1 stop12h 56m

C$ 684

St. LouisMontreal

STL Lambert-St Louis - YUL Montreal Pierre Elliott Trudeau Intl

STLYUL

Lambert-St Louis

Sat 17/10

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

1 stop10h 52m

Montreal Pierre Elliott Trudeau Intl

Wed 21/10

12:30 p.m.-12:09 a.m.

1 stop12h 39m

C$ 720

St. LouisMontreal

STL Lambert-St Louis - YUL Montreal Pierre Elliott Trudeau Intl

STLYUL

Lambert-St Louis

Tue 13/10

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

1 stop17h 17m

Montreal Pierre Elliott Trudeau Intl

Fri 16/10

5:34 p.m.-10:50 a.m.

1 stop18h 16m

C$ 738

St. LouisMontreal

STL Lambert-St Louis - YUL Montreal Pierre Elliott Trudeau Intl

STLYUL

Lambert-St Louis

Fri 18/9

5:18 p.m.-11:44 a.m.

1 stop17h 26m

Montreal Pierre Elliott Trudeau Intl

Tue 22/9

5:34 p.m.-10:18 a.m.

1 stop17h 44m

C$ 745

St. LouisMontreal

STL Lambert-St Louis - YUL Montreal Pierre Elliott Trudeau Intl

STLYUL

Lambert-St Louis

Tue 1/9

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

2 stops11h 12m

Montreal Pierre Elliott Trudeau Intl

Tue 8/9

5:34 p.m.-10:18 a.m.

1 stop17h 44m

C$ 748

St. LouisMontreal

STL Lambert-St Louis - YUL Montreal Pierre Elliott Trudeau Intl

STLYUL

Lambert-St Louis

Tue 1/9

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

1 stop9h 50m

Montreal Pierre Elliott Trudeau Intl

Fri 4/9

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

1 stop15h 50m

C$ 764

St. LouisMontreal

STL Lambert-St Louis - YUL Montreal Pierre Elliott Trudeau Intl

STLYUL

Lambert-St Louis

Tue 1/9

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

2 stops11h 12m

Montreal Pierre Elliott Trudeau Intl

Fri 4/9

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

1 stop15h 50m

C$ 778

St. LouisMontreal

STL Lambert-St Louis - YUL Montreal Pierre Elliott Trudeau Intl

STLYUL

Lambert-St Louis

Wed 9/9

2:29 p.m.-2:08 p.m.

2 stops22h 39m

Montreal Pierre Elliott Trudeau Intl

Wed 16/9

6:47 p.m.-11:42 p.m.

1 stop5h 55m

C$ 790

St. LouisMontreal

STL Lambert-St Louis - YUL Montreal Pierre Elliott Trudeau Intl

STLYUL

Lambert-St Louis

Tue 1/9

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

1 stop17h 51m

Montreal Pierre Elliott Trudeau Intl

Thu 17/9

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

1 stop12h 56m

C$ 792

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$ 409 to C$ 1,076.
The lowest price recently found on this route was C$ 681.

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$ 797.

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