Latest deals
Insights
When to book
FAQs
Price Alerts

Cheap flights from St. Louis to Montreal from C$ 340

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 13/10. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

Find the cheapest flights from St. Louis to Montreal

Cheap round-trip flights

Enter your travel dates to find the best prices.
Delta Logo
7:00 a.m. - 8:33 a.m.
STL
-
YUL
24h 33m
1 stop
Delta Logo
7:00 a.m. - 8:15 p.m.
YUL
-
STL
14h 15m
2 stops
C$ 773Delta
Mon, 12 Oct - Wed, 21 Oct
Multiple Airlines Logo
6:17 p.m. - 2:08 p.m.
STL
-
YUL
18h 51m
2 stops
Multiple Airlines Logo
6:51 p.m. - 11:58 p.m.
YUL
-
STL
6h 07m
1 stop
C$ 814Multiple Airlines
Fri, 21 Aug - Fri, 28 Aug
Multiple Airlines Logo
4:57 p.m. - 6:15 p.m.
STL
-
YUL
24h 18m
2 stops
Multiple Airlines Logo
12:44 p.m. - 5:53 p.m.
YUL
-
STL
6h 09m
1 stop
C$ 817Multiple Airlines
Mon, 17 Aug - Thu, 20 Aug
Multiple Airlines Logo
6:34 p.m. - 6:15 p.m.
STL
-
YUL
22h 41m
2 stops
Multiple Airlines Logo
6:00 a.m. - 9:37 a.m.
YUL
-
STL
4h 37m
1 stop
C$ 827Multiple Airlines
Sun, 16 Aug - Fri, 21 Aug
Delta Logo
5:28 p.m. - 8:33 a.m.
STL
-
YUL
14h 05m
2 stops
Delta Logo
7:00 a.m. - 8:15 p.m.
YUL
-
STL
14h 15m
2 stops
C$ 828Delta
Mon, 12 Oct - Tue, 20 Oct
Multiple Airlines Logo
6:17 p.m. - 2:08 p.m.
STL
-
YUL
18h 51m
2 stops
Multiple Airlines Logo
6:51 p.m. - 11:58 p.m.
YUL
-
STL
6h 07m
1 stop
C$ 831Multiple Airlines
Fri, 21 Aug - Fri, 28 Aug
Multiple Airlines Logo
4:57 p.m. - 6:15 p.m.
STL
-
YUL
24h 18m
2 stops
Multiple Airlines Logo
6:00 a.m. - 9:37 a.m.
YUL
-
STL
4h 37m
1 stop
C$ 832Multiple Airlines
Mon, 17 Aug - Thu, 20 Aug
Delta Logo
7:00 a.m. - 8:33 a.m.
STL
-
YUL
24h 33m
1 stop
Delta Logo
9:30 a.m. - 3:40 p.m.
YUL
-
STL
7h 10m
1 stop
C$ 834Delta
Mon, 12 Oct - Tue, 20 Oct
WestJet Logo
9:00 a.m. - 2:12 p.m.
STL
-
YUL
28h 12m
2 stops
WestJet Logo
6:00 a.m. - 8:37 p.m.
YUL
-
STL
15h 37m
1 stop
C$ 835WestJet
Fri, 4 Dec - Sun, 6 Dec
Multiple Airlines Logo
6:34 p.m. - 6:15 p.m.
STL
-
YUL
22h 41m
2 stops
Multiple Airlines Logo
6:00 a.m. - 9:37 a.m.
YUL
-
STL
4h 37m
1 stop
C$ 837Multiple Airlines
Tue, 4 Aug - Tue, 11 Aug

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

Air Canada flights from St. Louis to Montreal

Our best Air Canada deals on St. Louis to Montreal flight tickets
Air Canada
29 Aug
STL2:40 p.m.Lambert-St Louis
4h 47m
1 stop
YUL8:27 p.m.Montreal Pierre Elliott Trudeau Intl
1 Sep
YUL8:40 a.m.Montreal Pierre Elliott Trudeau Intl
6h 22m
2 stops
STL2:02 p.m.Lambert-St Louis
C$ 872
Air Canada
21 Aug
STL12:10 p.m.Lambert-St Louis
2h 32m
YUL3:42 p.m.Montreal Pierre Elliott Trudeau Intl
28 Aug
YUL4:55 p.m.Montreal Pierre Elliott Trudeau Intl
2h 47m
STL6:42 p.m.Lambert-St Louis
C$ 874
Air Canada
29 Aug
STL2:40 p.m.Lambert-St Louis
4h 47m
1 stop
YUL8:27 p.m.Montreal Pierre Elliott Trudeau Intl
1 Sep
YUL9:10 a.m.Montreal Pierre Elliott Trudeau Intl
5h 52m
1 stop
STL2:02 p.m.Lambert-St Louis
C$ 875

American Airlines flights from St. Louis to Montreal

Our best American Airlines deals on St. Louis to Montreal flight tickets
American Airlines
5 Aug
STL11:35 a.m.Lambert-St Louis
10h 51m
1 stop
YUL11:26 p.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$ 841
American Airlines
14 Oct
STL4:18 p.m.Lambert-St Louis
16h 34m
1 stop
YUL9:52 a.m.Montreal Pierre Elliott Trudeau Intl
20 Oct
YUL10:32 a.m.Montreal Pierre Elliott Trudeau Intl
11h 20m
1 stop
STL8:52 p.m.Lambert-St Louis
C$ 864
American Airlines
17 Aug
STL2:55 p.m.Lambert-St Louis
17h 51m
1 stop
YUL9:46 a.m.Montreal Pierre Elliott Trudeau Intl
20 Aug
YUL7:14 a.m.Montreal Pierre Elliott Trudeau Intl
16h 26m
1 stop
STL10:40 p.m.Lambert-St Louis
C$ 868

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 8 July 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

Mon 12/10

7:00 a.m.-8:33 a.m.

1 stop24h 33m

Montreal Pierre Elliott Trudeau Intl

Wed 21/10

7:00 a.m.-8:15 p.m.

2 stops14h 15m

C$ 773
Quickest round-trip

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Fri 21/8

6:17 p.m.-2:08 p.m.

2 stops18h 51m

Montreal Pierre Elliott Trudeau Intl

Fri 28/8

6:51 p.m.-11:58 p.m.

1 stop6h 07m

C$ 814

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 17/8

4:57 p.m.-6:15 p.m.

2 stops24h 18m

Montreal Pierre Elliott Trudeau Intl

Thu 20/8

12:44 p.m.-5:53 p.m.

1 stop6h 09m

C$ 817

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sun 16/8

6:34 p.m.-6:15 p.m.

2 stops22h 41m

Montreal Pierre Elliott Trudeau Intl

Fri 21/8

6:00 a.m.-9:37 a.m.

1 stop4h 37m

C$ 827

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 12/10

5:28 p.m.-8:33 a.m.

2 stops14h 05m

Montreal Pierre Elliott Trudeau Intl

Tue 20/10

7:00 a.m.-8:15 p.m.

2 stops14h 15m

C$ 828

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Fri 21/8

6:17 p.m.-2:08 p.m.

2 stops18h 51m

Montreal Pierre Elliott Trudeau Intl

Fri 28/8

6:51 p.m.-11:58 p.m.

1 stop6h 07m

C$ 831

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 17/8

4:57 p.m.-6:15 p.m.

2 stops24h 18m

Montreal Pierre Elliott Trudeau Intl

Thu 20/8

6:00 a.m.-9:37 a.m.

1 stop4h 37m

C$ 832

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 12/10

7:00 a.m.-8:33 a.m.

1 stop24h 33m

Montreal Pierre Elliott Trudeau Intl

Tue 20/10

9:30 a.m.-3:40 p.m.

1 stop7h 10m

C$ 834

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Fri 4/12

9:00 a.m.-2:12 p.m.

2 stops28h 12m

Montreal Pierre Elliott Trudeau Intl

Sun 6/12

6:00 a.m.-8:37 p.m.

1 stop15h 37m

C$ 835

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 4/8

6:34 p.m.-6:15 p.m.

2 stops22h 41m

Montreal Pierre Elliott Trudeau Intl

Tue 11/8

6:00 a.m.-9:37 a.m.

1 stop4h 37m

C$ 837

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$ 365, 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 October instead. Flights to Montreal in October, while not as cheap as those in August, still average around C$ 394.

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
Fri 7/8
Fri 14/8
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