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Cheap flights from Montreal to St. Louis from C$ 269

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 1/10. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Find the cheapest flights from Montreal to St. Louis

Cheap round-trip flights

American Airlines Logo
7:50 a.m. - 6:20 p.m.YUL-STL
11h 30m2 stops
American Airlines Logo
5:40 p.m. - 3:11 p.m.STL-YUL
20h 31m1 stop
C$ 501American Airlines
Find Deal
Wed, 29 Oct - Wed, 5 Nov
American Airlines Logo
7:50 a.m. - 6:20 p.m.YUL-STL
11h 30m2 stops
American Airlines Logo
6:00 a.m. - 10:39 p.m.STL-YUL
15h 39m2 stops
C$ 508American Airlines
Find Deal
Wed, 29 Oct - Wed, 5 Nov
United Airlines Logo
6:00 a.m. - 3:46 p.m.YUL-STL
10h 46m1 stop
United Airlines Logo
6:43 p.m. - 12:46 p.m.STL-YUL
17h 03m2 stops
C$ 622United Airlines
Find Deal
Thu, 6 Nov - Sat, 8 Nov
Logo
5:10 p.m. - 10:12 a.m.YUL-STL
18h 02m2 stops
Logo
12:20 p.m. - 3:10 p.m.STL-YUL
25h 50m1 stop
C$ 623
Find Deal
Sat, 8 Nov - Sun, 16 Nov
Delta Logo
7:30 p.m. - 8:13 a.m.YUL-STL
13h 43m1 stop
Delta Logo
9:35 a.m. - 6:40 p.m.STL-YUL
8h 05m1 stop
C$ 642Delta
Find Deal
Wed, 5 Nov - Wed, 12 Nov
Delta Logo
7:30 p.m. - 8:13 a.m.YUL-STL
13h 43m1 stop
Delta Logo
9:35 a.m. - 6:40 p.m.STL-YUL
8h 05m1 stop
C$ 644Delta
Find Deal
Wed, 5 Nov - Wed, 12 Nov
United Airlines Logo
6:00 a.m. - 3:49 p.m.YUL-STL
10h 49m1 stop
United Airlines Logo
6:30 a.m. - 3:57 p.m.STL-YUL
8h 27m1 stop
C$ 662United Airlines
Find Deal
Wed, 29 Oct - Wed, 5 Nov
Logo
6:00 a.m. - 8:40 a.m.YUL-STL
27h 40m3 stops
Logo
10:35 a.m. - 12:27 a.m.STL-YUL
12h 52m2 stops
C$ 707
Find Deal
Tue, 30 Sep - Thu, 2 Oct
Air Canada Logo
4:00 p.m. - 7:38 p.m.YUL-STL
4h 38m1 stop
Air Canada Logo
4:05 p.m. - 9:40 p.m.STL-YUL
4h 35m1 stop
C$ 721Air Canada
Find Deal
Thu, 9 Oct - Mon, 13 Oct
Air Canada Logo
9:15 a.m. - 3:18 p.m.YUL-STL
7h 03m1 stop
Air Canada Logo
9:15 a.m. - 5:20 p.m.STL-YUL
7h 05m1 stop
C$ 739Air Canada
Find Deal
Thu, 9 Oct - Mon, 13 Oct

United Airlines flights from Montreal to St. Louis

Our best United Airlines deals on Montreal to St. Louis flight tickets
United Airlines
6 Nov
YUL6:00 a.m.Montreal Pierre Elliott Trudeau Intl
10h 46m
1 stop
STL3:46 p.m.Lambert-St Louis
8 Nov
STL6:43 p.m.Lambert-St Louis
17h 03m
2 stops
YUL12:46 p.m.Montreal Pierre Elliott Trudeau Intl
C$ 622
Find similar
United Airlines
29 Oct
YUL6:00 a.m.Montreal Pierre Elliott Trudeau Intl
10h 49m
1 stop
STL3:49 p.m.Lambert-St Louis
5 Nov
STL6:30 a.m.Lambert-St Louis
8h 27m
1 stop
YUL3:57 p.m.Montreal Pierre Elliott Trudeau Intl
C$ 662
Find similar
United Airlines
6 Nov
YUL7:00 a.m.Montreal Pierre Elliott Trudeau Intl
9h 46m
2 stops
STL3:46 p.m.Lambert-St Louis
8 Nov
STL6:43 p.m.Lambert-St Louis
17h 03m
2 stops
YUL12:46 p.m.Montreal Pierre Elliott Trudeau Intl
C$ 709
Find similar

Delta flights from Montreal to St. Louis

Our best Delta deals on Montreal to St. Louis flight tickets
Delta
5 Nov
YUL7:30 p.m.Montreal Pierre Elliott Trudeau Intl
13h 43m
1 stop
STL8:13 a.m.Lambert-St Louis
12 Nov
STL9:35 a.m.Lambert-St Louis
8h 05m
1 stop
YUL6:40 p.m.Montreal Pierre Elliott Trudeau Intl
C$ 642
Find similar
Delta
5 Nov
YUL7:30 p.m.Montreal Pierre Elliott Trudeau Intl
13h 43m
1 stop
STL8:13 a.m.Lambert-St Louis
12 Nov
STL9:35 a.m.Lambert-St Louis
8h 05m
1 stop
YUL6:40 p.m.Montreal Pierre Elliott Trudeau Intl
C$ 644
Find similar
Delta
5 Nov
YUL7:30 p.m.Montreal Pierre Elliott Trudeau Intl
13h 43m
1 stop
STL8:13 a.m.Lambert-St Louis
12 Nov
STL5:34 p.m.Lambert-St Louis
5h 08m
1 stop
YUL11:42 p.m.Montreal Pierre Elliott Trudeau Intl
C$ 653
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 16 September 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 29/10

7:50 a.m.-6:20 p.m.

2 stops11h 30m

Lambert-St Louis

Wed 5/11

5:40 p.m.-3:11 p.m.

1 stop20h 31m

C$ 501

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Wed 29/10

7:50 a.m.-6:20 p.m.

2 stops11h 30m

Lambert-St Louis

Wed 5/11

6:00 a.m.-10:39 p.m.

2 stops15h 39m

C$ 508

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 6/11

6:00 a.m.-3:46 p.m.

1 stop10h 46m

Lambert-St Louis

Sat 8/11

6:43 p.m.-12:46 p.m.

2 stops17h 03m

C$ 622

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Sat 8/11

5:10 p.m.-10:12 a.m.

2 stops18h 02m

Lambert-St Louis

Sun 16/11

12:20 p.m.-3:10 p.m.

1 stop25h 50m

C$ 623

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Wed 5/11

7:30 p.m.-8:13 a.m.

1 stop13h 43m

Lambert-St Louis

Wed 12/11

9:35 a.m.-6:40 p.m.

1 stop8h 05m

C$ 642

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Wed 5/11

7:30 p.m.-8:13 a.m.

1 stop13h 43m

Lambert-St Louis

Wed 12/11

9:35 a.m.-6:40 p.m.

1 stop8h 05m

C$ 644

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Wed 29/10

6:00 a.m.-3:49 p.m.

1 stop10h 49m

Lambert-St Louis

Wed 5/11

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

1 stop8h 27m

C$ 662

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Tue 30/9

6:00 a.m.-8:40 a.m.

3 stops27h 40m

Lambert-St Louis

Thu 2/10

10:35 a.m.-12:27 a.m.

2 stops12h 52m

C$ 707

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 9/10

4:00 p.m.-7:38 p.m.

1 stop4h 38m

Lambert-St Louis

Mon 13/10

4:05 p.m.-9:40 p.m.

1 stop4h 35m

C$ 721

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 9/10

9:15 a.m.-3:18 p.m.

1 stop7h 03m

Lambert-St Louis

Mon 13/10

9:15 a.m.-5:20 p.m.

1 stop7h 05m

C$ 739

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 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 typical price of a round-trip flight between Montreal and St. Louis?

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$ 395. 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$ 629.

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$ 619. The most expensive day to fly to St. Louis is Monday, with ticket prices averaging around C$ 1,049.

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$ 700. If you have a flexible travel schedule, then try to avoid flying in the evening when prices are C$ 954 on average. Flights to St. Louis from Montreal in the evening 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

Best price found

C$ 496

Fastest flight time

2h 47m

Direct flights

Mon, Tue, Wed, Fri, Sat and Sun

Airports in St. Louis

1 airport
The best one-way flight to St. Louis from Montreal in the past 72 hours is C$ 496. The best round-trip flight deal from Montreal to St. Louis found on momondo in the last 72 hours is C$ 1,244.
The fastest flight from Montreal to St. Louis takes 2h 47m
Direct flights go from Montreal to St. Louis on Monday, Tuesday, Wednesday, Friday, Saturday and Sunday. The only airline offering direct flights is Air Canada.
There is 1 airport near St. Louis: Lambert-St Louis (STL)
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 2h 47m, 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$ 542Free CancellationRating
7.1
10,000 reviews
Search Air Canada flights
United AirlinesPriceFrom C$ 592Free CancellationRating
7.4
8,929 reviews
Search United Airlines flights
WestJetPriceFrom C$ 740Free CancellationRating
7.2
3,091 reviews
Search WestJet flights

  • United Airlines Flights From Montreal to St. Louis

    Across 7 United Airlines flights from Montreal to St. Louis this week, the average price was C$ 457, with the best United Airlines deals starting from C$ 429 round-trip. 8,929 users have rated United Airlines on momondo, with an average score of 7.4/10.

  • Air Canada Flights From Montreal to St. Louis

    Another popular option for Montreal to St. Louis flights is Air Canada (7.1/10, 10,000 ratings). Air Canada flies from Montreal to St. Louis around 7 times per week, with deals starting from C$ 392 round-trip and rising to an average price of around C$ 539.

Travelling to a place near St. Louis?

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

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