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Cheap flights from Montreal to St. Louis from C$ 366

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 27/9. 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

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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.
Air Canada Logo
4:55 p.m. - 6:41 p.m.
YUL
-
STL
2h 46mdirect
Air Canada Logo
12:10 p.m. - 3:41 p.m.
STL
-
YUL
2h 31mdirect
C$ 680Air Canada
Thu, 15 Oct - Mon, 19 Oct
Air Canada Logo
4:55 p.m. - 6:41 p.m.
YUL
-
STL
2h 46mdirect
Air Canada Logo
12:10 p.m. - 3:41 p.m.
STL
-
YUL
2h 31mdirect
C$ 682Air Canada
Thu, 15 Oct - Mon, 19 Oct
Air Canada Logo
4:55 p.m. - 6:41 p.m.
YUL
-
STL
2h 46mdirect
Air Canada Logo
12:10 p.m. - 3:41 p.m.
STL
-
YUL
2h 31mdirect
C$ 686Air Canada
Thu, 15 Oct - Mon, 19 Oct
Delta Logo
6:00 a.m. - 1:20 p.m.
YUL
-
STL
8h 20m
1 stop
Delta Logo
5:45 p.m. - 11:10 p.m.
STL
-
YUL
4h 25m
1 stop
C$ 687Delta
Tue, 27 Oct - Wed, 28 Oct
United Airlines Logo
6:00 a.m. - 3:43 p.m.
YUL
-
STL
10h 43m
2 stops
United Airlines Logo
8:00 a.m. - 7:45 p.m.
STL
-
YUL
10h 45m
2 stops
C$ 689United Airlines
Thu, 1 Oct - Wed, 7 Oct
Air Canada Logo
8:40 a.m. - 2:02 p.m.
YUL
-
STL
6h 22m
2 stops
Air Canada Logo
12:10 p.m. - 3:42 p.m.
STL
-
YUL
2h 32mdirect
C$ 690Air Canada
Thu, 9 Jul - Sun, 12 Jul
Air Canada Logo
4:55 p.m. - 6:42 p.m.
YUL
-
STL
2h 47mdirect
Air Canada Logo
12:10 p.m. - 3:42 p.m.
STL
-
YUL
2h 32mdirect
C$ 691Air Canada
Fri, 24 Jul - Sun, 26 Jul
Air Canada Logo
4:55 p.m. - 6:42 p.m.
YUL
-
STL
2h 47mdirect
Air Canada Logo
12:10 p.m. - 3:42 p.m.
STL
-
YUL
2h 32mdirect
C$ 693Air Canada
Fri, 24 Jul - Sun, 26 Jul
United Airlines Logo
9:45 a.m. - 9:21 p.m.
YUL
-
STL
12h 36m
1 stop
United Airlines Logo
8:00 a.m. - 7:45 p.m.
STL
-
YUL
10h 45m
2 stops
C$ 694United Airlines
Thu, 1 Oct - Sun, 4 Oct
American Airlines Logo
12:30 p.m. - 12:16 a.m.
YUL
-
STL
12h 46m
1 stop
American Airlines Logo
6:00 a.m. - 4:50 p.m.
STL
-
YUL
9h 50m
1 stop
C$ 696American Airlines
Tue, 4 Aug - Tue, 11 Aug

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American Airlines flights from Montreal to St. Louis

Our best American Airlines deals on Montreal to St. Louis flight tickets
American Airlines
4 Aug
YUL12:30 p.m.Montreal Pierre Elliott Trudeau Intl
12h 46m
1 stop
STL12:16 a.m.Lambert-St Louis
11 Aug
STL6:00 a.m.Lambert-St Louis
9h 50m
1 stop
YUL4:50 p.m.Montreal Pierre Elliott Trudeau Intl
C$ 696
American Airlines
3 Aug
YUL12:30 p.m.Montreal Pierre Elliott Trudeau Intl
12h 46m
1 stop
STL12:16 a.m.Lambert-St Louis
10 Aug
STL6:00 a.m.Lambert-St Louis
14h 44m
1 stop
YUL9:44 p.m.Montreal Pierre Elliott Trudeau Intl
C$ 735
American Airlines
3 Aug
YUL12:30 p.m.Montreal Pierre Elliott Trudeau Intl
12h 46m
1 stop
STL12:16 a.m.Lambert-St Louis
10 Aug
STL6:00 a.m.Lambert-St Louis
14h 44m
1 stop
YUL9:44 p.m.Montreal Pierre Elliott Trudeau Intl
C$ 740

Delta flights from Montreal to St. Louis

Our best Delta deals on Montreal to St. Louis flight tickets
Delta
27 Oct
YUL6:00 a.m.Montreal Pierre Elliott Trudeau Intl
8h 20m
1 stop
STL1:20 p.m.Lambert-St Louis
28 Oct
STL5:45 p.m.Lambert-St Louis
4h 25m
1 stop
YUL11:10 p.m.Montreal Pierre Elliott Trudeau Intl
C$ 687
Delta
8 Jul
YUL7:00 a.m.Montreal Pierre Elliott Trudeau Intl
9h 13m
1 stop
STL3:13 p.m.Lambert-St Louis
14 Jul
STL3:58 p.m.Lambert-St Louis
6h 54m
1 stop
YUL11:52 p.m.Montreal Pierre Elliott Trudeau Intl
C$ 718
Delta
7 Jul
YUL6:47 p.m.Montreal Pierre Elliott Trudeau Intl
6h 06m
1 stop
STL11:53 p.m.Lambert-St Louis
16 Jul
STL1:22 p.m.Lambert-St Louis
9h 30m
1 stop
YUL11:52 p.m.Montreal Pierre Elliott Trudeau Intl
C$ 768

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 23 June 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

Cheapest round-trip
Quickest round-trip

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 15/10

4:55 p.m.-6:41 p.m.

Nonstop2h 46m

Lambert-St Louis

Mon 19/10

12:10 p.m.-3:41 p.m.

Nonstop2h 31m

C$ 680

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 15/10

4:55 p.m.-6:41 p.m.

Nonstop2h 46m

Lambert-St Louis

Mon 19/10

12:10 p.m.-3:41 p.m.

Nonstop2h 31m

C$ 682

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 15/10

4:55 p.m.-6:41 p.m.

Nonstop2h 46m

Lambert-St Louis

Mon 19/10

12:10 p.m.-3:41 p.m.

Nonstop2h 31m

C$ 686

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Tue 27/10

6:00 a.m.-1:20 p.m.

1 stop8h 20m

Lambert-St Louis

Wed 28/10

5:45 p.m.-11:10 p.m.

1 stop4h 25m

C$ 687

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 1/10

6:00 a.m.-3:43 p.m.

2 stops10h 43m

Lambert-St Louis

Wed 7/10

8:00 a.m.-7:45 p.m.

2 stops10h 45m

C$ 689

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 9/7

8:40 a.m.-2:02 p.m.

2 stops6h 22m

Lambert-St Louis

Sun 12/7

12:10 p.m.-3:42 p.m.

Nonstop2h 32m

C$ 690

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 24/7

4:55 p.m.-6:42 p.m.

Nonstop2h 47m

Lambert-St Louis

Sun 26/7

12:10 p.m.-3:42 p.m.

Nonstop2h 32m

C$ 691

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 24/7

4:55 p.m.-6:42 p.m.

Nonstop2h 47m

Lambert-St Louis

Sun 26/7

12:10 p.m.-3:42 p.m.

Nonstop2h 32m

C$ 693

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 1/10

9:45 a.m.-9:21 p.m.

1 stop12h 36m

Lambert-St Louis

Sun 4/10

8:00 a.m.-7:45 p.m.

2 stops10h 45m

C$ 694

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Tue 4/8

12:30 p.m.-12:16 a.m.

1 stop12h 46m

Lambert-St Louis

Tue 11/8

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

1 stop9h 50m

C$ 696

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 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 June is, on average, the cheapest month to fly to St. Louis from Montreal, with most prices found around C$ 351. If you don’t want to visit St. Louis in June, then you should wait until December to fly from Montreal, when ticket prices are also cheap, with an average price of C$ 392.

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 St. Louis flights?

There is only 1 cabin class available to choose from on Montreal to 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 3% 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

Fastest flight time

2h 46m

Direct flights

Every day

Airports in St. Louis

1 airport
The fastest flight from Montreal to St. Louis takes 2h 46m
Direct flights go from Montreal to St. Louis every day.
There is 1 airport in St. Louis. From Montreal there are direct flights to Lambert-St Louis (STL).
Search flight deals

Frequently asked questions about flying from Montreal to St. Louis

  • 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 46m, 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$ 571Free CancellationRating
7.1
11,244 reviews
Search Air Canada flights

  • Air Canada Flights From Montreal to St. Louis

    Across 7 Air Canada flights from Montreal to St. Louis this week, the average price was C$ 776, with the best Air Canada deals starting from C$ 571 round-trip. 11,244 users have rated Air Canada on momondo, with an average score of 7.1/10.

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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