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Cheap flights from Montreal to St. Louis from C$ 305

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Montreal to St. Louis departing on 11/12. 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 Montreal to St. Louis

Cheap round-trip flights

Enter your travel dates to find the best prices.
American Airlines Logo
3:49 p.m. - 8:09 a.m.YUL-STL
17h 20m1 stop
American Airlines Logo
5:05 a.m. - 3:10 p.m.STL-YUL
9h 05m1 stop
C$ 623American Airlines
Find Deal
Wed, 26 Nov - Wed, 3 Dec
Multiple Airlines Logo
4:35 p.m. - 9:40 a.m.YUL-STL
18h 05m1 stop
Multiple Airlines Logo
10:53 a.m. - 4:55 p.m.STL-YUL
29h 02m2 stops
C$ 629Multiple Airlines
Find Deal
Sun, 16 Nov - Thu, 27 Nov
Multiple Airlines Logo
5:10 p.m. - 9:47 a.m.YUL-STL
17h 37m2 stops
Multiple Airlines Logo
11:51 a.m. - 12:45 a.m.STL-YUL
11h 54m1 stop
C$ 632Multiple Airlines
Find Deal
Thu, 11 Dec - Thu, 18 Dec
American Airlines Logo
3:49 p.m. - 8:09 a.m.YUL-STL
17h 20m1 stop
American Airlines Logo
5:05 a.m. - 10:40 p.m.STL-YUL
16h 35m2 stops
C$ 660American Airlines
Find Deal
Wed, 26 Nov - Wed, 3 Dec
Delta Logo
7:00 a.m. - 4:07 p.m.YUL-STL
10h 07m1 stop
Delta Logo
5:34 p.m. - 11:47 p.m.STL-YUL
5h 13m1 stop
C$ 735Delta
Find Deal
Tue, 25 Nov - Tue, 2 Dec
Delta Logo
4:45 p.m. - 8:47 p.m.YUL-STL
5h 02m1 stop
Delta Logo
6:05 a.m. - 1:49 p.m.STL-YUL
6h 44m1 stop
C$ 743Delta
Find Deal
Fri, 5 Dec - Fri, 2 Jan
United Airlines Logo
7:00 p.m. - 11:01 a.m.YUL-STL
17h 01m2 stops
United Airlines Logo
6:30 a.m. - 3:57 p.m.STL-YUL
8h 27m1 stop
C$ 767United Airlines
Find Deal
Fri, 5 Dec - Fri, 2 Jan
United Airlines Logo
7:00 a.m. - 3:46 p.m.YUL-STL
9h 46m2 stops
United Airlines Logo
12:55 p.m. - 7:48 p.m.STL-YUL
5h 53m1 stop
C$ 777United Airlines
Find Deal
Tue, 25 Nov - Tue, 2 Dec
Air Canada Logo
8:50 a.m. - 3:29 p.m.YUL-STL
7h 39m2 stops
Air Canada Logo
6:30 a.m. - 3:16 p.m.STL-YUL
7h 46m2 stops
C$ 1,126Air Canada
Find Deal
Fri, 14 Nov - Sun, 16 Nov
Air Canada Logo
8:50 a.m. - 3:29 p.m.YUL-STL
7h 39m2 stops
Air Canada Logo
5:24 p.m. - 1:53 a.m.STL-YUL
7h 29m2 stops
C$ 1,306Air Canada
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Fri, 14 Nov - Sun, 16 Nov

WestJet flights from Montreal to St. Louis

Our best WestJet deals on Montreal to St. Louis flight tickets
WestJet
19 Dec
YUL6:45 a.m.Montreal Pierre Elliott Trudeau Intl
12h 48m
2 stops
STL6:33 p.m.Lambert-St Louis
3 Jan
STL6:29 a.m.Lambert-St Louis
15h 50m
1 stop
YUL11:19 p.m.Montreal Pierre Elliott Trudeau Intl
C$ 954
Find similar
WestJet
16 Nov
YUL6:45 a.m.Montreal Pierre Elliott Trudeau Intl
10h 22m
2 stops
STL4:07 p.m.Lambert-St Louis
3 Dec
STL1:35 p.m.Lambert-St Louis
10h 08m
2 stops
YUL12:43 a.m.Montreal Pierre Elliott Trudeau Intl
C$ 999
Find similar
WestJet
19 Dec
YUL6:45 a.m.Montreal Pierre Elliott Trudeau Intl
17h 42m
2 stops
STL11:27 p.m.Lambert-St Louis
3 Jan
STL7:10 a.m.Lambert-St Louis
16h 33m
2 stops
YUL12:43 a.m.Montreal Pierre Elliott Trudeau Intl
C$ 1,013
Find similar

American Airlines flights from Montreal to St. Louis

Our best American Airlines deals on Montreal to St. Louis flight tickets
American Airlines
26 Nov
YUL3:49 p.m.Montreal Pierre Elliott Trudeau Intl
17h 20m
1 stop
STL8:09 a.m.Lambert-St Louis
3 Dec
STL5:05 a.m.Lambert-St Louis
9h 05m
1 stop
YUL3:10 p.m.Montreal Pierre Elliott Trudeau Intl
C$ 623
Find similar
American Airlines
26 Nov
YUL3:49 p.m.Montreal Pierre Elliott Trudeau Intl
17h 20m
1 stop
STL8:09 a.m.Lambert-St Louis
3 Dec
STL5:05 a.m.Lambert-St Louis
16h 35m
2 stops
YUL10:40 p.m.Montreal Pierre Elliott Trudeau Intl
C$ 660
Find similar
American Airlines
10 Nov
YUL2:29 p.m.Montreal Pierre Elliott Trudeau Intl
9h 38m
1 stop
STL11:07 p.m.Lambert-St Louis
17 Nov
STL10:15 a.m.Lambert-St Louis
11h 24m
1 stop
YUL10:39 p.m.Montreal Pierre Elliott Trudeau Intl
C$ 819
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Montreal to St. Louis 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 October 2025.
Use the filters below to find and compare flights from Montreal to St. Louis that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Wed 26/11

3:49 p.m.-8:09 a.m.

1 stop17h 20m

Lambert-St Louis

Wed 3/12

5:05 a.m.-3:10 p.m.

1 stop9h 05m

C$ 623

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Sun 16/11

4:35 p.m.-9:40 a.m.

1 stop18h 05m

Lambert-St Louis

Thu 27/11

10:53 a.m.-4:55 p.m.

2 stops29h 02m

C$ 629

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 11/12

5:10 p.m.-9:47 a.m.

2 stops17h 37m

Lambert-St Louis

Thu 18/12

11:51 a.m.-12:45 a.m.

1 stop11h 54m

C$ 632

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Wed 26/11

3:49 p.m.-8:09 a.m.

1 stop17h 20m

Lambert-St Louis

Wed 3/12

5:05 a.m.-10:40 p.m.

2 stops16h 35m

C$ 660

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Tue 25/11

7:00 a.m.-4:07 p.m.

1 stop10h 07m

Lambert-St Louis

Tue 2/12

5:34 p.m.-11:47 p.m.

1 stop5h 13m

C$ 735

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 5/12

4:45 p.m.-8:47 p.m.

1 stop5h 02m

Lambert-St Louis

Fri 2/1

6:05 a.m.-1:49 p.m.

1 stop6h 44m

C$ 743

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 5/12

7:00 p.m.-11:01 a.m.

2 stops17h 01m

Lambert-St Louis

Fri 2/1

6:30 a.m.-3:57 p.m.

1 stop8h 27m

C$ 767

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Tue 25/11

7:00 a.m.-3:46 p.m.

2 stops9h 46m

Lambert-St Louis

Tue 2/12

12:55 p.m.-7:48 p.m.

1 stop5h 53m

C$ 777

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 14/11

8:50 a.m.-3:29 p.m.

2 stops7h 39m

Lambert-St Louis

Sun 16/11

6:30 a.m.-3:16 p.m.

2 stops7h 46m

C$ 1,126

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 14/11

8:50 a.m.-3:29 p.m.

2 stops7h 39m

Lambert-St Louis

Sun 16/11

5:24 p.m.-1:53 a.m.

2 stops7h 29m

C$ 1,306

Flights are sorted by cheapest round-trip flights first.

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See travel insights to St. Louis from

How to get the cheapest flight ticket from Montreal to St. Louis

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 St. Louis?

The month of July is, on average, the cheapest month to fly to St. Louis from Montreal, with most prices found around C$ 400. If you don’t want to visit St. Louis in July, then you should wait until February to fly from Montreal, when ticket prices are also cheap, with an average price of C$ 636.

What is the cheapest day to depart on your flight to St. Louis?

Our data shows that Friday is the least expensive day to fly to St. Louis. Tickets to fly out on this day can be as low as C$ 626. The most expensive day to fly to St. Louis is Monday, with ticket prices averaging around C$ 1,131.

What is the cheapest time of day to depart on your flight to St. Louis?

The cheapest time of day to fly to St. Louis is in the morning when flights can be purchased for as low as C$ 709. If you have a flexible travel schedule, then try to avoid flying in the afternoon when prices are C$ 765 on average. Flights to St. Louis from Montreal in the afternoon are generally more expensive because this time of day is more convenient for travellers’ schedules.

What is the cheapest Montreal to Lambert-St Louis flight route?

Fly from Montreal Pierre Elliott Trudeau Intl to Lambert-St Louis for the best Montreal - Lambert-St Louis flight prices

What cabin class options are available on Montreal to Lambert-St Louis flights?

There is only 1 cabin class available to choose from on Montreal to Lambert-St Louis 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 Montreal to St. Louis flights?

You could potentially save up to 18% on your flight if you consider stops on a Montreal to St. Louis flight.

When to book flights from Montreal to St. Louis

Are you open to changing your travel dates? Check out the ideal times to fly from Montreal to St. Louis according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Montreal to St. Louis (YMQ to STL) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Montreal to St. Louis

Direct flights

None
There are no direct flights from Montreal to St. Louis. There are no popular flight routes from Montreal to St. Louis.
Search flight deals

  • How far is Montreal to Lambert-St Louis by plane?

    The straight-line distance from Montreal to Lambert-St Louis is 1566.0 km. Flights usually cover this in 5h 02m, depending on flying conditions and air traffic around both airports.

  • When did momondo last update prices for flights from Montreal to Lambert-St Louis Airport?

    Prices for flights from Montreal to Lambert-St Louis Airport are updated daily.

  • How many operators does momondo search for flights from Montreal to Lambert-St Louis Airport?

  • How old do you have to be to fly from Montreal to Lambert-St Louis Airport?

    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 Montreal to Lambert-St Louis Airport.

  • What documentation or ID do you need to fly to Lambert-St Louis Airport?

    The travel and health documents you'll need for your trip to Lambert-St Louis Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Lambert-St Louis Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

  • What is the most popular plane model from Montreal to St. Louis?

  • What is the most popular airline from Montreal to St. Louis?

Best airlines flying from Montreal to St. Louis

Compare and see reviews for airlines that fly from Montreal to St. Louis with momondo
Airline
Rating
Free Cancellation
Price
Air CanadaPriceFrom C$ 548Free CancellationRating
7.1
10,372 reviews
Search Air Canada flights
United AirlinesPriceFrom C$ 599Free CancellationRating
7.4
8,999 reviews
Search United Airlines flights
WestJetPriceFrom C$ 749Free CancellationRating
7.2
3,148 reviews
Search WestJet flights

Travelling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
Chesterfield
Litchfield

Why use momondo?

Why should I use momondo to find a flight deal from Montreal to St. Louis?

It is quick and easy to find Montreal to St. Louis flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to St. Louis that suits you.

Can I find flights from Montreal to St. Louis with flexible booking policies on momondo?

Yes. All flights to St. Louis from Montreal on momondo can be compared and filtered by various policies on offer, including flexible booking.

How can momondo help me find flights from Montreal to St. Louis?

Once all potential Montreal to St. Louis flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

I’m not ready to book a flight from Montreal to St. Louis right now. Can momondo alert me if prices change?

If you are simply researching potential flights to St. Louis, momondo offers a useful price alert feature which will track prices for flights to St. Louis from Montreal and alert you when they change.

An easier way to manage your St. Louis trip

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