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Cheap flights from St. Louis to Montreal from C$ 301

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 12/7. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Find the cheapest flights from St. Louis to Montreal

Cheap round-trip flights

Enter your travel dates to find the best prices.
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$ 599Air Canada
Sat, 1 Aug - Tue, 4 Aug
Air Canada Logo
8:55 a.m. - 3:22 p.m.
STL
-
YUL
5h 27m
1 stop
Air Canada Logo
4:55 p.m. - 6:42 p.m.
YUL
-
STL
2h 47mdirect
C$ 610Air Canada
Sat, 1 Aug - Tue, 4 Aug
American Airlines Logo
8:06 p.m. - 11:44 a.m.
STL
-
YUL
14h 38m
1 stop
American Airlines Logo
12:30 p.m. - 11:59 p.m.
YUL
-
STL
12h 29m
1 stop
C$ 654American Airlines
Tue, 18 Aug - Tue, 25 Aug
Air Canada Logo
1:05 p.m. - 4:40 p.m.
STL
-
YUL
2h 35mdirect
Air Canada Logo
6:30 p.m. - 8:25 p.m.
YUL
-
STL
2h 55mdirect
C$ 669Air Canada
Thu, 28 May - Sun, 31 May
Air Canada Logo
8:55 a.m. - 4:22 p.m.
STL
-
YUL
6h 27m
1 stop
Air Canada Logo
10:10 a.m. - 2:02 p.m.
YUL
-
STL
4h 52m
1 stop
C$ 676Air Canada
Sat, 1 Aug - Tue, 4 Aug
Air Canada Logo
1:05 p.m. - 4:40 p.m.
STL
-
YUL
2h 35mdirect
Air Canada Logo
7:00 a.m. - 12:06 p.m.
YUL
-
STL
6h 06m
1 stop
C$ 680Air Canada
Thu, 28 May - Sun, 31 May
Multiple Airlines Logo
5:27 p.m. - 6:15 p.m.
STL
-
YUL
23h 48m
2 stops
Multiple Airlines Logo
6:50 p.m. - 11:56 p.m.
YUL
-
STL
6h 06m
1 stop
C$ 690Multiple Airlines
Fri, 5 Jun - Sun, 7 Jun
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$ 705Air Canada
Sun, 12 Jul - Wed, 15 Jul
Air Canada Logo
2:15 p.m. - 8:51 p.m.
STL
-
YUL
5h 36m
1 stop
Air Canada Logo
6:30 p.m. - 8:25 p.m.
YUL
-
STL
2h 55mdirect
C$ 709Air Canada
Mon, 8 Jun - Fri, 12 Jun
Air Canada Logo
1:20 p.m. - 4:55 p.m.
STL
-
YUL
2h 35mdirect
Air Canada Logo
10:10 a.m. - 2:02 p.m.
YUL
-
STL
4h 52m
1 stop
C$ 724Air Canada
Mon, 29 Jun - Mon, 6 Jul

Air Canada flights from St. Louis to Montreal

Our best Air Canada deals on St. Louis to Montreal flight tickets
Air Canada
28 May
STL1:05 p.m.Lambert-St Louis
2h 35m
YUL4:40 p.m.Montreal Pierre Elliott Trudeau Intl
31 May
YUL6:30 p.m.Montreal Pierre Elliott Trudeau Intl
2h 55m
STL8:25 p.m.Lambert-St Louis
C$ 669
Air Canada
28 May
STL1:05 p.m.Lambert-St Louis
2h 35m
YUL4:40 p.m.Montreal Pierre Elliott Trudeau Intl
31 May
YUL7:00 a.m.Montreal Pierre Elliott Trudeau Intl
6h 06m
1 stop
STL12:06 p.m.Lambert-St Louis
C$ 680
Air Canada
11 Aug
STL12:10 p.m.Lambert-St Louis
2h 32m
YUL3:42 p.m.Montreal Pierre Elliott Trudeau Intl
12 Aug
YUL4:55 p.m.Montreal Pierre Elliott Trudeau Intl
2h 47m
STL6:42 p.m.Lambert-St Louis
C$ 705

United Airlines flights from St. Louis to Montreal

Our best United Airlines deals on St. Louis to Montreal flight tickets
United Airlines
23 Jul
STL6:00 a.m.Lambert-St Louis
10h 30m
1 stop
YUL5:30 p.m.Montreal Pierre Elliott Trudeau Intl
27 Jul
YUL3:25 p.m.Montreal Pierre Elliott Trudeau Intl
9h 19m
1 stop
STL11:44 p.m.Lambert-St Louis
C$ 817
United Airlines
17 Aug
STL8:00 a.m.Lambert-St Louis
10h 45m
2 stops
YUL7:45 p.m.Montreal Pierre Elliott Trudeau Intl
27 Aug
YUL11:23 a.m.Montreal Pierre Elliott Trudeau Intl
11h 37m
2 stops
STL10:00 p.m.Lambert-St Louis
C$ 837
United Airlines
23 May
STL1:13 p.m.Lambert-St Louis
7h 13m
1 stop
YUL9:26 p.m.Montreal Pierre Elliott Trudeau Intl
31 May
YUL6:10 a.m.Montreal Pierre Elliott Trudeau Intl
7h 01m
1 stop
STL12:11 p.m.Lambert-St Louis
C$ 944

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 16 May 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
Quickest round-trip

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sat 1/8

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

Nonstop2h 32m

Montreal Pierre Elliott Trudeau Intl

Tue 4/8

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

Nonstop2h 47m

C$ 599

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sat 1/8

8:55 a.m.-3:22 p.m.

1 stop5h 27m

Montreal Pierre Elliott Trudeau Intl

Tue 4/8

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

Nonstop2h 47m

C$ 610

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 18/8

8:06 p.m.-11:44 a.m.

1 stop14h 38m

Montreal Pierre Elliott Trudeau Intl

Tue 25/8

12:30 p.m.-11:59 p.m.

1 stop12h 29m

C$ 654

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 28/5

1:05 p.m.-4:40 p.m.

Nonstop2h 35m

Montreal Pierre Elliott Trudeau Intl

Sun 31/5

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

Nonstop2h 55m

C$ 669

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sat 1/8

8:55 a.m.-4:22 p.m.

1 stop6h 27m

Montreal Pierre Elliott Trudeau Intl

Tue 4/8

10:10 a.m.-2:02 p.m.

1 stop4h 52m

C$ 676

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 28/5

1:05 p.m.-4:40 p.m.

Nonstop2h 35m

Montreal Pierre Elliott Trudeau Intl

Sun 31/5

7:00 a.m.-12:06 p.m.

1 stop6h 06m

C$ 680

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Fri 5/6

5:27 p.m.-6:15 p.m.

2 stops23h 48m

Montreal Pierre Elliott Trudeau Intl

Sun 7/6

6:50 p.m.-11:56 p.m.

1 stop6h 06m

C$ 690

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sun 12/7

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

Nonstop2h 32m

Montreal Pierre Elliott Trudeau Intl

Wed 15/7

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

Nonstop2h 47m

C$ 705

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 8/6

2:15 p.m.-8:51 p.m.

1 stop5h 36m

Montreal Pierre Elliott Trudeau Intl

Fri 12/6

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

Nonstop2h 55m

C$ 709

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 29/6

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

Nonstop2h 35m

Montreal Pierre Elliott Trudeau Intl

Mon 6/7

10:10 a.m.-2:02 p.m.

1 stop4h 52m

C$ 724

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 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 July. Flight prices, which tend to average around C$ 291, are often lower during this time because this is during the off-season. If you aren’t able to travel during the month of July, then book flights to Montreal from St. Louis during August instead. Flights to Montreal in August, while not as cheap as those in July, still average around C$ 392.

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

Can stopping save me money on St. Louis to Montreal flights?

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

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.

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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