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Cheap flights from Montreal to St. Louis from C$ 295

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 28/2. 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

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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
12:30 p.m. - 11:46 p.m.
YUL
-
STL
12h 16m
1 stop
American Airlines Logo
8:03 p.m. - 11:44 a.m.
STL
-
YUL
14h 41m
1 stop
C$ 481American Airlines
Mon, 20 Apr - Sat, 25 Apr
American Airlines Logo
12:30 p.m. - 11:46 p.m.
YUL
-
STL
12h 16m
1 stop
American Airlines Logo
5:46 a.m. - 11:44 a.m.
STL
-
YUL
4h 58m
1 stop
C$ 572American Airlines
Mon, 20 Apr - Sat, 25 Apr
Air Canada Logo
8:50 a.m. - 3:29 p.m.
YUL
-
STL
7h 39m
2 stops
Air Canada Logo
4:05 p.m. - 11:32 p.m.
STL
-
YUL
6h 27m
1 stop
C$ 616Air Canada
Thu, 12 Mar - Mon, 16 Mar
Air Canada Logo
11:10 a.m. - 3:29 p.m.
YUL
-
STL
5h 19m
1 stop
Air Canada Logo
4:05 p.m. - 11:32 p.m.
STL
-
YUL
6h 27m
1 stop
C$ 621Air Canada
Thu, 12 Mar - Mon, 16 Mar
American Airlines Logo
3:45 p.m. - 11:44 p.m.
YUL
-
STL
8h 59m
1 stop
American Airlines Logo
7:05 a.m. - 1:45 p.m.
STL
-
YUL
5h 40m
1 stop
C$ 625American Airlines
Wed, 11 Mar - Wed, 18 Mar
American Airlines Logo
12:59 p.m. - 11:44 p.m.
YUL
-
STL
11h 45m
2 stops
American Airlines Logo
6:00 a.m. - 12:24 p.m.
STL
-
YUL
5h 24m
1 stop
C$ 638American Airlines
Wed, 11 Mar - Wed, 18 Mar
Air Canada Logo
6:10 p.m. - 8:05 p.m.
YUL
-
STL
2h 55mdirect
Air Canada Logo
1:15 p.m. - 4:50 p.m.
STL
-
YUL
2h 35mdirect
C$ 639Air Canada
Thu, 25 Jun - Sun, 28 Jun
Delta Logo
6:45 p.m. - 11:59 p.m.
YUL
-
STL
6h 14m
1 stop
Delta Logo
5:47 p.m. - 11:41 p.m.
STL
-
YUL
4h 54m
1 stop
C$ 647Delta
Sun, 10 May - Sat, 16 May
Air Canada Logo
6:10 p.m. - 8:05 p.m.
YUL
-
STL
2h 55mdirect
Air Canada Logo
7:30 a.m. - 3:21 p.m.
STL
-
YUL
6h 51m
1 stop
C$ 651Air Canada
Sun, 10 May - Sat, 16 May
Multiple Airlines Logo
6:45 a.m. - 9:26 p.m.
YUL
-
STL
15h 41m
2 stops
Multiple Airlines Logo
3:49 p.m. - 12:30 a.m.
STL
-
YUL
7h 41m
1 stop
C$ 658Multiple Airlines
Thu, 26 Feb - Tue, 3 Mar

Air Canada flights from Montreal to St. Louis

Our best Air Canada deals on Montreal to St. Louis flight tickets
Air Canada
12 Mar
YUL8:50 a.m.Montreal Pierre Elliott Trudeau Intl
7h 39m
2 stops
STL3:29 p.m.Lambert-St Louis
16 Mar
STL4:05 p.m.Lambert-St Louis
6h 27m
1 stop
YUL11:32 p.m.Montreal Pierre Elliott Trudeau Intl
C$ 616
Air Canada
12 Mar
YUL11:10 a.m.Montreal Pierre Elliott Trudeau Intl
5h 19m
1 stop
STL3:29 p.m.Lambert-St Louis
16 Mar
STL4:05 p.m.Lambert-St Louis
6h 27m
1 stop
YUL11:32 p.m.Montreal Pierre Elliott Trudeau Intl
C$ 621
Air Canada
25 Jun
YUL6:10 p.m.Montreal Pierre Elliott Trudeau Intl
2h 55m
STL8:05 p.m.Lambert-St Louis
28 Jun
STL1:15 p.m.Lambert-St Louis
2h 35m
YUL4:50 p.m.Montreal Pierre Elliott Trudeau Intl
C$ 639

Delta flights from Montreal to St. Louis

Our best Delta deals on Montreal to St. Louis flight tickets
Delta
10 May
YUL6:45 p.m.Montreal Pierre Elliott Trudeau Intl
6h 14m
1 stop
STL11:59 p.m.Lambert-St Louis
16 May
STL6:04 p.m.Lambert-St Louis
4h 09m
1 stop
YUL11:13 p.m.Montreal Pierre Elliott Trudeau Intl
C$ 645
Delta
10 May
YUL6:45 p.m.Montreal Pierre Elliott Trudeau Intl
6h 14m
1 stop
STL11:59 p.m.Lambert-St Louis
16 May
STL5:47 p.m.Lambert-St Louis
4h 54m
1 stop
YUL11:41 p.m.Montreal Pierre Elliott Trudeau Intl
C$ 647
Delta
18 Mar
YUL12:50 p.m.Montreal Pierre Elliott Trudeau Intl
4h 42m
1 stop
STL4:32 p.m.Lambert-St Louis
25 Mar
STL7:03 a.m.Lambert-St Louis
10h 32m
2 stops
YUL6:35 p.m.Montreal Pierre Elliott Trudeau Intl
C$ 686

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 3 February 2026.
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

Mon 20/4

12:30 p.m.-11:46 p.m.

1 stop12h 16m

Lambert-St Louis

Sat 25/4

8:03 p.m.-11:44 a.m.

1 stop14h 41m

C$ 481

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Mon 20/4

12:30 p.m.-11:46 p.m.

1 stop12h 16m

Lambert-St Louis

Sat 25/4

5:46 a.m.-11:44 a.m.

1 stop4h 58m

C$ 572

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 12/3

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

2 stops7h 39m

Lambert-St Louis

Mon 16/3

4:05 p.m.-11:32 p.m.

1 stop6h 27m

C$ 616

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 12/3

11:10 a.m.-3:29 p.m.

1 stop5h 19m

Lambert-St Louis

Mon 16/3

4:05 p.m.-11:32 p.m.

1 stop6h 27m

C$ 621

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Wed 11/3

3:45 p.m.-11:44 p.m.

1 stop8h 59m

Lambert-St Louis

Wed 18/3

7:05 a.m.-1:45 p.m.

1 stop5h 40m

C$ 625

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Wed 11/3

12:59 p.m.-11:44 p.m.

2 stops11h 45m

Lambert-St Louis

Wed 18/3

6:00 a.m.-12:24 p.m.

1 stop5h 24m

C$ 638

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 25/6

6:10 p.m.-8:05 p.m.

Nonstop2h 55m

Lambert-St Louis

Sun 28/6

1:15 p.m.-4:50 p.m.

Nonstop2h 35m

C$ 639

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Sun 10/5

6:45 p.m.-11:59 p.m.

1 stop6h 14m

Lambert-St Louis

Sat 16/5

5:47 p.m.-11:41 p.m.

1 stop4h 54m

C$ 647

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Sun 10/5

6:10 p.m.-8:05 p.m.

Nonstop2h 55m

Lambert-St Louis

Sat 16/5

7:30 a.m.-3:21 p.m.

1 stop6h 51m

C$ 651

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 26/2

6:45 a.m.-9:26 p.m.

2 stops15h 41m

Lambert-St Louis

Tue 3/3

3:49 p.m.-12:30 a.m.

1 stop7h 41m

C$ 658

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 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$ 391. If you don’t want to visit St. Louis in July, then you should wait until September to fly from Montreal, when ticket prices are also cheap, with an average price of C$ 575.

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$ 612. The most expensive day to fly to St. Louis is Saturday, with ticket prices averaging around C$ 914.

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?

No. A direct flight is the cheapest option for a flight between Montreal to St. Louis.

How have Montreal to St. Louis flight prices changed over time?

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

Fastest flight time

2h 55m

Direct flights

Mon, Wed, Fri and Sun

Airports in St. Louis

1 airport
The fastest flight from Montreal to St. Louis takes 2h 55m
Direct flights go from Montreal to St. Louis on Monday, Wednesday, Friday and Sunday. The only airline offering direct flights is Air Canada.
There is 1 airport in St. Louis. From Montreal there are direct flights to 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 55m, 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
United AirlinesPriceFrom C$ 450Free CancellationRating
7.4
9,231 reviews
Search United Airlines flights
Air CanadaPriceFrom C$ 535Free CancellationRating
7.1
10,676 reviews
Search Air Canada flights
WestJetPriceFrom C$ 694Free CancellationRating
7.2
3,254 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

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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