Latest deals
Insights
When to book
FAQs
Price Alerts

Cheap flights from St. Louis to Montreal from C$ 265

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 15/9. 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

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
8:05 p.m. - 11:20 a.m.
STL
-
YUL
14h 15m
1 stop
American Airlines Logo
12:30 p.m. - 8:08 p.m.
YUL
-
STL
8h 38m
1 stop
C$ 598American Airlines
Tue, 6 Oct - Tue, 13 Oct
American Airlines Logo
8:06 p.m. - 11:43 a.m.
STL
-
YUL
14h 37m
1 stop
American Airlines Logo
5:34 p.m. - 10:20 a.m.
YUL
-
STL
17h 46m
1 stop
C$ 658American Airlines
Sat, 5 Sep - Tue, 8 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$ 676American Airlines
Tue, 18 Aug - Fri, 21 Aug
WestJet Logo
7:00 a.m. - 7:05 a.m.
STL
-
YUL
23h 05m
2 stops
WestJet Logo
6:00 a.m. - 4:38 p.m.
YUL
-
STL
11h 38m
1 stop
C$ 706WestJet
Mon, 31 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. - 8:24 a.m.
YUL
-
STL
15h 50m
1 stop
C$ 715American Airlines
Tue, 18 Aug - Fri, 21 Aug
American Airlines Logo
5:00 a.m. - 4:54 p.m.
STL
-
YUL
10h 54m
1 stop
American Airlines Logo
12:30 p.m. - 12:14 a.m.
YUL
-
STL
12h 44m
1 stop
C$ 734American Airlines
Sat, 8 Aug - Tue, 18 Aug
Multiple Airlines Logo
5:06 p.m. - 6:15 p.m.
STL
-
YUL
24h 09m
2 stops
Multiple Airlines Logo
6:47 p.m. - 9:43 a.m.
YUL
-
STL
15h 56m
1 stop
C$ 736Multiple Airlines
Sat, 4 Jul - Mon, 13 Jul
Multiple Airlines Logo
5:06 p.m. - 6:15 p.m.
STL
-
YUL
24h 09m
2 stops
Multiple Airlines Logo
6:47 p.m. - 11:53 p.m.
YUL
-
STL
6h 06m
1 stop
C$ 746Multiple Airlines
Sat, 4 Jul - Mon, 13 Jul
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$ 755Multiple Airlines
Tue, 18 Aug - Fri, 21 Aug
Multiple Airlines Logo
4:57 p.m. - 6:15 p.m.
STL
-
YUL
24h 18m
2 stops
Multiple Airlines Logo
6:47 p.m. - 11:53 p.m.
YUL
-
STL
6h 06m
1 stop
C$ 756Multiple Airlines
Mon, 13 Jul - Wed, 15 Jul

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

WestJet flights from St. Louis to Montreal

Our best WestJet deals on St. Louis to Montreal flight tickets
WestJet
31 Aug
STL7:00 a.m.Lambert-St Louis
23h 05m
2 stops
YUL7:05 a.m.Montreal Pierre Elliott Trudeau Intl
2 Sep
YUL6:00 a.m.Montreal Pierre Elliott Trudeau Intl
11h 38m
1 stop
STL4:38 p.m.Lambert-St Louis
C$ 706
WestJet
14 Aug
STL5:23 p.m.Lambert-St Louis
5h 29m
1 stop
YUL11:52 p.m.Montreal Pierre Elliott Trudeau Intl
17 Aug
YUL6:47 p.m.Montreal Pierre Elliott Trudeau Intl
6h 11m
1 stop
STL11:58 p.m.Lambert-St Louis
C$ 855
WestJet
4 Jul
STL6:10 p.m.Lambert-St Louis
4h 18m
1 stop
YUL11:28 p.m.Montreal Pierre Elliott Trudeau Intl
13 Jul
YUL6:47 p.m.Montreal Pierre Elliott Trudeau Intl
15h 56m
1 stop
STL9:43 a.m.Lambert-St Louis
C$ 875

Delta flights from St. Louis to Montreal

Our best Delta deals on St. Louis to Montreal flight tickets
Delta
1 Sep
STL6:00 a.m.Lambert-St Louis
11h 54m
2 stops
YUL6:54 p.m.Montreal Pierre Elliott Trudeau Intl
4 Sep
YUL2:29 p.m.Montreal Pierre Elliott Trudeau Intl
7h 02m
1 stop
STL8:31 p.m.Lambert-St Louis
C$ 876
Delta
13 Jul
STL7:08 a.m.Lambert-St Louis
9h 34m
1 stop
YUL5:42 p.m.Montreal Pierre Elliott Trudeau Intl
15 Jul
YUL9:30 a.m.Montreal Pierre Elliott Trudeau Intl
12h 05m
1 stop
STL8:35 p.m.Lambert-St Louis
C$ 883
Delta
25 Sep
STL4:59 p.m.Lambert-St Louis
5h 58m
1 stop
YUL11:57 p.m.Montreal Pierre Elliott Trudeau Intl
27 Sep
YUL7:00 a.m.Montreal Pierre Elliott Trudeau Intl
7h 23m
1 stop
STL1:23 p.m.Lambert-St Louis
C$ 885

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 17 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
Quickest round-trip

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 6/10

8:05 p.m.-11:20 a.m.

1 stop14h 15m

Montreal Pierre Elliott Trudeau Intl

Tue 13/10

12:30 p.m.-8:08 p.m.

1 stop8h 38m

C$ 598

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sat 5/9

8:06 p.m.-11:43 a.m.

1 stop14h 37m

Montreal Pierre Elliott Trudeau Intl

Tue 8/9

5:34 p.m.-10:20 a.m.

1 stop17h 46m

C$ 658

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$ 676

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 31/8

7:00 a.m.-7:05 a.m.

2 stops23h 05m

Montreal Pierre Elliott Trudeau Intl

Wed 2/9

6:00 a.m.-4:38 p.m.

1 stop11h 38m

C$ 706

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.-8:24 a.m.

1 stop15h 50m

C$ 715

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sat 8/8

5:00 a.m.-4:54 p.m.

1 stop10h 54m

Montreal Pierre Elliott Trudeau Intl

Tue 18/8

12:30 p.m.-12:14 a.m.

1 stop12h 44m

C$ 734

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sat 4/7

5:06 p.m.-6:15 p.m.

2 stops24h 09m

Montreal Pierre Elliott Trudeau Intl

Mon 13/7

6:47 p.m.-9:43 a.m.

1 stop15h 56m

C$ 736

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sat 4/7

5:06 p.m.-6:15 p.m.

2 stops24h 09m

Montreal Pierre Elliott Trudeau Intl

Mon 13/7

6:47 p.m.-11:53 p.m.

1 stop6h 06m

C$ 746

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$ 755

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 13/7

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

2 stops24h 18m

Montreal Pierre Elliott Trudeau Intl

Wed 15/7

6:47 p.m.-11:53 p.m.

1 stop6h 06m

C$ 756

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$ 360, 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 September instead. Flights to Montreal in September, while not as cheap as those in August, still average around C$ 399.

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 17/7
Fri 24/7
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