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Cheap flights from St. Louis to Montreal from C$ 199

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 3/12. 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
2:47 p.m. - 4:23 p.m.STL-YUL
24h 36m1 stop
Multiple Airlines Logo
8:00 a.m. - 10:33 p.m.YUL-STL
15h 33m2 stops
C$ 536Multiple Airlines
Find Deal
Thu, 4 Dec - Mon, 8 Dec
Multiple Airlines Logo
3:30 p.m. - 12:30 a.m.STL-YUL
8h 00m1 stop
Multiple Airlines Logo
8:00 a.m. - 10:33 p.m.YUL-STL
15h 33m2 stops
C$ 558Multiple Airlines
Find Deal
Sat, 13 Dec - Mon, 15 Dec
American Airlines Logo
2:19 p.m. - 3:05 p.m.STL-YUL
23h 46m1 stop
American Airlines Logo
3:55 p.m. - 9:33 a.m.YUL-STL
18h 38m1 stop
C$ 583American Airlines
Find Deal
Tue, 17 Feb - Thu, 19 Feb
American Airlines Logo
8:01 p.m. - 3:10 p.m.STL-YUL
18h 09m1 stop
American Airlines Logo
3:52 p.m. - 10:21 a.m.YUL-STL
19h 29m1 stop
C$ 594American Airlines
Find Deal
Tue, 30 Dec - Thu, 8 Jan
United Airlines Logo
10:00 a.m. - 9:17 p.m.STL-YUL
10h 17m1 stop
United Airlines Logo
4:45 p.m. - 3:40 p.m.YUL-STL
23h 55m1 stop
C$ 852United Airlines
Find Deal
Fri, 5 Dec - Mon, 8 Dec
United Airlines Logo
3:19 p.m. - 2:00 p.m.STL-YUL
21h 41m1 stop
United Airlines Logo
4:45 p.m. - 12:29 p.m.YUL-STL
20h 44m1 stop
C$ 878United Airlines
Find Deal
Mon, 15 Dec - Tue, 6 Jan
Delta Logo
7:05 a.m. - 6:54 p.m.STL-YUL
10h 49m2 stops
Delta Logo
9:34 a.m. - 8:45 p.m.YUL-STL
12h 11m2 stops
C$ 905Delta
Find Deal
Mon, 15 Dec - Tue, 6 Jan
Delta Logo
9:50 a.m. - 6:54 p.m.STL-YUL
8h 04m1 stop
Delta Logo
9:34 a.m. - 8:45 p.m.YUL-STL
12h 11m2 stops
C$ 915Delta
Find Deal
Mon, 15 Dec - Tue, 6 Jan
Air Canada Logo
4:05 p.m. - 9:52 p.m.STL-YUL
4h 47m1 stop
Air Canada Logo
10:10 a.m. - 3:29 p.m.YUL-STL
6h 19m1 stop
C$ 977Air Canada
Find Deal
Mon, 15 Dec - Sat, 3 Jan
Air Canada Logo
4:05 p.m. - 10:22 p.m.STL-YUL
5h 17m1 stop
Air Canada Logo
9:10 a.m. - 3:29 p.m.YUL-STL
7h 19m1 stop
C$ 980Air Canada
Find Deal
Mon, 15 Dec - Sat, 3 Jan

American Airlines flights from St. Louis to Montreal

Our best American Airlines deals on St. Louis to Montreal flight tickets
American Airlines
17 Feb
STL2:19 p.m.Lambert-St Louis
23h 46m
1 stop
YUL3:05 p.m.Montreal Pierre Elliott Trudeau Intl
19 Feb
YUL3:55 p.m.Montreal Pierre Elliott Trudeau Intl
18h 38m
1 stop
STL9:33 a.m.Lambert-St Louis
C$ 583
Find similar
American Airlines
30 Dec
STL8:01 p.m.Lambert-St Louis
18h 09m
1 stop
YUL3:10 p.m.Montreal Pierre Elliott Trudeau Intl
8 Jan
YUL3:52 p.m.Montreal Pierre Elliott Trudeau Intl
19h 29m
1 stop
STL10:21 a.m.Lambert-St Louis
C$ 594
Find similar
American Airlines
17 Feb
STL6:00 a.m.Lambert-St Louis
8h 05m
1 stop
YUL3:05 p.m.Montreal Pierre Elliott Trudeau Intl
19 Feb
YUL7:30 a.m.Montreal Pierre Elliott Trudeau Intl
17h 00m
2 stops
STL11:30 p.m.Lambert-St Louis
C$ 597
Find similar

Delta flights from St. Louis to Montreal

Our best Delta deals on St. Louis to Montreal flight tickets
Delta
15 Dec
STL7:05 a.m.Lambert-St Louis
10h 49m
2 stops
YUL6:54 p.m.Montreal Pierre Elliott Trudeau Intl
6 Jan
YUL9:34 a.m.Montreal Pierre Elliott Trudeau Intl
12h 11m
2 stops
STL8:45 p.m.Lambert-St Louis
C$ 905
Find similar
Delta
15 Dec
STL9:50 a.m.Lambert-St Louis
8h 04m
1 stop
YUL6:54 p.m.Montreal Pierre Elliott Trudeau Intl
6 Jan
YUL9:34 a.m.Montreal Pierre Elliott Trudeau Intl
12h 11m
2 stops
STL8:45 p.m.Lambert-St Louis
C$ 915
Find similar
Delta
3 Dec
STL6:39 a.m.Lambert-St Louis
11h 15m
2 stops
YUL6:54 p.m.Montreal Pierre Elliott Trudeau Intl
10 Dec
YUL9:35 a.m.Montreal Pierre Elliott Trudeau Intl
12h 12m
2 stops
STL8:47 p.m.Lambert-St Louis
C$ 931
Find similar

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 5 November 2025.
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

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 4/12

2:47 p.m.-4:23 p.m.

1 stop24h 36m

Montreal Pierre Elliott Trudeau Intl

Mon 8/12

8:00 a.m.-10:33 p.m.

2 stops15h 33m

C$ 536

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sat 13/12

3:30 p.m.-12:30 a.m.

1 stop8h 00m

Montreal Pierre Elliott Trudeau Intl

Mon 15/12

8:00 a.m.-10:33 p.m.

2 stops15h 33m

C$ 558

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 17/2

2:19 p.m.-3:05 p.m.

1 stop23h 46m

Montreal Pierre Elliott Trudeau Intl

Thu 19/2

3:55 p.m.-9:33 a.m.

1 stop18h 38m

C$ 583

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 30/12

8:01 p.m.-3:10 p.m.

1 stop18h 09m

Montreal Pierre Elliott Trudeau Intl

Thu 8/1

3:52 p.m.-10:21 a.m.

1 stop19h 29m

C$ 594

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Fri 5/12

10:00 a.m.-9:17 p.m.

1 stop10h 17m

Montreal Pierre Elliott Trudeau Intl

Mon 8/12

4:45 p.m.-3:40 p.m.

1 stop23h 55m

C$ 852

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 15/12

3:19 p.m.-2:00 p.m.

1 stop21h 41m

Montreal Pierre Elliott Trudeau Intl

Tue 6/1

4:45 p.m.-12:29 p.m.

1 stop20h 44m

C$ 878

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 15/12

7:05 a.m.-6:54 p.m.

2 stops10h 49m

Montreal Pierre Elliott Trudeau Intl

Tue 6/1

9:34 a.m.-8:45 p.m.

2 stops12h 11m

C$ 905

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 15/12

9:50 a.m.-6:54 p.m.

1 stop8h 04m

Montreal Pierre Elliott Trudeau Intl

Tue 6/1

9:34 a.m.-8:45 p.m.

2 stops12h 11m

C$ 915

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 15/12

4:05 p.m.-9:52 p.m.

1 stop4h 47m

Montreal Pierre Elliott Trudeau Intl

Sat 3/1

10:10 a.m.-3:29 p.m.

1 stop6h 19m

C$ 977

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 15/12

4:05 p.m.-10:22 p.m.

1 stop5h 17m

Montreal Pierre Elliott Trudeau Intl

Sat 3/1

9:10 a.m.-3:29 p.m.

1 stop7h 19m

C$ 980

Flights are sorted by cheapest round-trip flights 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 cheapest month to fly to Montreal?

The cheapest month to fly to Montreal from St. Louis is in June. Flight prices, which tend to average around C$ 403, are often lower during this time because this is during the off-season. If you aren’t able to travel during the month of June, then book flights to Montreal from St. Louis during August instead. Flights to Montreal in August, while not as cheap as those in June, still average around C$ 650.

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?

You could potentially save up to 39% on your flight if you consider stops on a St. Louis to Montreal flight.

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

Direct flights

None
There are no direct flights from St. Louis to Montreal. There are no popular flight routes from St. Louis to Montreal.
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  • 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 4h 21m, 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