Latest deals
Insights
When to book
FAQs
Price Alerts

Cheap flights from St. Louis to Montreal from C$ 334

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 26/7. 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

Save money when you book flights with momondo

Big names, great deals

Big names, great deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Early arrival? Instantly customize your results

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

Find the cheapest flights from St. Louis to Montreal

Cheap round-trip flights

Enter your travel dates to find the best prices.
American Airlines Logo
2:55 p.m. - 9:46 a.m.
STL
-
YUL
17h 51m
1 stop
American Airlines Logo
10:31 a.m. - 8:44 p.m.
YUL
-
STL
11h 13m
1 stop
C$ 710American Airlines
Wed, 26 Aug - Wed, 2 Sep
American Airlines Logo
6:00 a.m. - 4:53 p.m.
STL
-
YUL
9h 53m
1 stop
American Airlines Logo
5:34 p.m. - 8:23 a.m.
YUL
-
STL
15h 49m
1 stop
C$ 759American Airlines
Tue, 18 Aug - Fri, 21 Aug
Air Canada Logo
1:20 p.m. - 4:55 p.m.
STL
-
YUL
2h 35mdirect
Air Canada Logo
6:30 p.m. - 8:25 p.m.
YUL
-
STL
2h 55mdirect
C$ 760Air Canada
Sun, 21 Jun - Thu, 25 Jun
American Airlines Logo
3:20 p.m. - 9:48 a.m.
STL
-
YUL
17h 28m
1 stop
American Airlines Logo
10:31 a.m. - 8:44 p.m.
YUL
-
STL
11h 13m
1 stop
C$ 769American Airlines
Thu, 30 Jul - Wed, 12 Aug
American Airlines Logo
7:28 a.m. - 10:54 p.m.
STL
-
YUL
14h 26m
1 stop
American Airlines Logo
10:30 a.m. - 9:17 p.m.
YUL
-
STL
11h 47m
1 stop
C$ 770American Airlines
Sun, 27 Sep - Wed, 30 Sep
Multiple Airlines Logo
6:33 p.m. - 6:15 p.m.
STL
-
YUL
22h 42m
2 stops
Multiple Airlines Logo
7:00 a.m. - 11:46 a.m.
YUL
-
STL
5h 46m
1 stop
C$ 774Multiple Airlines
Tue, 18 Aug - Fri, 21 Aug
Air Canada Logo
2:15 p.m. - 9:50 p.m.
STL
-
YUL
6h 35m
1 stop
Air Canada Logo
6:30 p.m. - 8:25 p.m.
YUL
-
STL
2h 55mdirect
C$ 780Air Canada
Fri, 19 Jun - Thu, 25 Jun
Multiple Airlines Logo
5:33 p.m. - 7:18 p.m.
STL
-
YUL
24h 45m
2 stops
Multiple Airlines Logo
2:29 p.m. - 8:31 p.m.
YUL
-
STL
7h 02m
1 stop
C$ 784Multiple Airlines
Wed, 26 Aug - Wed, 2 Sep
Multiple Airlines Logo
6:33 p.m. - 6:15 p.m.
STL
-
YUL
22h 42m
2 stops
Multiple Airlines Logo
7:00 a.m. - 11:46 a.m.
YUL
-
STL
5h 46m
1 stop
C$ 787Multiple Airlines
Tue, 18 Aug - Fri, 21 Aug
Air Canada Logo
12:10 p.m. - 3:42 p.m.
STL
-
YUL
2h 32mdirect
Air Canada Logo
4:55 p.m. - 6:42 p.m.
YUL
-
STL
2h 47mdirect
C$ 791Air Canada
Tue, 7 Jul - Thu, 9 Jul

American Airlines flights from St. Louis to Montreal

Our best American Airlines deals on St. Louis to Montreal flight tickets
American Airlines
26 Aug
STL2:55 p.m.Lambert-St Louis
17h 51m
1 stop
YUL9:46 a.m.Montreal Pierre Elliott Trudeau Intl
2 Sep
YUL10:31 a.m.Montreal Pierre Elliott Trudeau Intl
11h 13m
1 stop
STL8:44 p.m.Lambert-St Louis
C$ 710
American Airlines
18 Aug
STL6:00 a.m.Lambert-St Louis
9h 53m
1 stop
YUL4:53 p.m.Montreal Pierre Elliott Trudeau Intl
21 Aug
YUL5:34 p.m.Montreal Pierre Elliott Trudeau Intl
15h 49m
1 stop
STL8:23 a.m.Lambert-St Louis
C$ 759
American Airlines
30 Jul
STL3:20 p.m.Lambert-St Louis
17h 28m
1 stop
YUL9:48 a.m.Montreal Pierre Elliott Trudeau Intl
12 Aug
YUL10:31 a.m.Montreal Pierre Elliott Trudeau Intl
11h 13m
1 stop
STL8:44 p.m.Lambert-St Louis
C$ 769

Air Canada flights from St. Louis to Montreal

Our best Air Canada deals on St. Louis to Montreal flight tickets
Air Canada
21 Jun
STL1:20 p.m.Lambert-St Louis
2h 35m
YUL4:55 p.m.Montreal Pierre Elliott Trudeau Intl
25 Jun
YUL6:30 p.m.Montreal Pierre Elliott Trudeau Intl
2h 55m
STL8:25 p.m.Lambert-St Louis
C$ 760
Air Canada
19 Jun
STL2:15 p.m.Lambert-St Louis
6h 35m
1 stop
YUL9:50 p.m.Montreal Pierre Elliott Trudeau Intl
25 Jun
YUL6:30 p.m.Montreal Pierre Elliott Trudeau Intl
2h 55m
STL8:25 p.m.Lambert-St Louis
C$ 780
Air Canada
7 Jul
STL12:10 p.m.Lambert-St Louis
2h 32m
YUL3:42 p.m.Montreal Pierre Elliott Trudeau Intl
9 Jul
YUL4:55 p.m.Montreal Pierre Elliott Trudeau Intl
2h 47m
STL6:42 p.m.Lambert-St Louis
C$ 791

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 June 2026.
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

Cheapest round-trip

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Wed 26/8

2:55 p.m.-9:46 a.m.

1 stop17h 51m

Montreal Pierre Elliott Trudeau Intl

Wed 2/9

10:31 a.m.-8:44 p.m.

1 stop11h 13m

C$ 710

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 18/8

6:00 a.m.-4:53 p.m.

1 stop9h 53m

Montreal Pierre Elliott Trudeau Intl

Fri 21/8

5:34 p.m.-8:23 a.m.

1 stop15h 49m

C$ 759

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sun 21/6

1:20 p.m.-4:55 p.m.

Nonstop2h 35m

Montreal Pierre Elliott Trudeau Intl

Thu 25/6

6:30 p.m.-8:25 p.m.

Nonstop2h 55m

C$ 760

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 30/7

3:20 p.m.-9:48 a.m.

1 stop17h 28m

Montreal Pierre Elliott Trudeau Intl

Wed 12/8

10:31 a.m.-8:44 p.m.

1 stop11h 13m

C$ 769

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sun 27/9

7:28 a.m.-10:54 p.m.

1 stop14h 26m

Montreal Pierre Elliott Trudeau Intl

Wed 30/9

10:30 a.m.-9:17 p.m.

1 stop11h 47m

C$ 770

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 18/8

6:33 p.m.-6:15 p.m.

2 stops22h 42m

Montreal Pierre Elliott Trudeau Intl

Fri 21/8

7:00 a.m.-11:46 a.m.

1 stop5h 46m

C$ 774

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Fri 19/6

2:15 p.m.-9:50 p.m.

1 stop6h 35m

Montreal Pierre Elliott Trudeau Intl

Thu 25/6

6:30 p.m.-8:25 p.m.

Nonstop2h 55m

C$ 780

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Wed 26/8

5:33 p.m.-7:18 p.m.

2 stops24h 45m

Montreal Pierre Elliott Trudeau Intl

Wed 2/9

2:29 p.m.-8:31 p.m.

1 stop7h 02m

C$ 784

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 18/8

6:33 p.m.-6:15 p.m.

2 stops22h 42m

Montreal Pierre Elliott Trudeau Intl

Fri 21/8

7:00 a.m.-11:46 a.m.

1 stop5h 46m

C$ 787
Quickest round-trip

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 7/7

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

Nonstop2h 32m

Montreal Pierre Elliott Trudeau Intl

Thu 9/7

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

Nonstop2h 47m

C$ 791

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

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

What is the cheapest month to fly to Montreal?

The cheapest month to fly to Montreal from St. Louis is in August. Flight prices, which tend to average around C$ 357, are often lower during this time because this is during the off-season. If you aren’t able to travel during the month of August, then book flights to Montreal from St. Louis during May instead. Flights to Montreal in May, while not as cheap as those in August, still average around C$ 417.

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 St. Louis to Montreal flights?

There is only 1 cabin class available to choose from on 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.

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

Fastest flight time

2h 31m

Direct flights

Every day

Airports in Montreal

2 airports
The fastest flight from St. Louis to Montreal takes 2h 31m
Direct flights go from St. Louis to Montreal every day.
There are 2 airports in Montreal. From St. Louis there are direct flights to Montreal Pierre Elliott Trudeau Intl (YUL).
Search flight deals

Frequently asked questions about flying from St. Louis to Montreal

  • 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 2h 31m, 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.

An easier way to manage your Montreal trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Sun 5/7
Sun 12/7
By creating a price alert you accept our terms of use and privacy policy.

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