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Cheap flights from St. Louis to Montreal from $148

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 12/14. 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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0 bags

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Cheap round-trip flights

Enter your travel dates to find the best prices.
American Airlines Logo
6:00 am - 3:05 pm
STL
-
YUL
8h 05m1 stop
American Airlines Logo
3:55 pm - 9:34 am
YUL
-
STL
18h 39m1 stop
$273American Airlines
Tue, Feb 17 - Fri, Feb 20
Multiple Airlines Logo
5:11 pm - 8:14 pm
STL
-
YUL
26h 03m2 stops
Multiple Airlines Logo
4:35 pm - 9:21 am
YUL
-
STL
17h 46m1 stop
$375Multiple Airlines
Sun, Jan 18 - Sun, Jan 25
United Airlines Logo
11:20 am - 10:20 am
STL
-
YUL
22h 00m1 stop
United Airlines Logo
1:10 pm - 10:58 pm
YUL
-
STL
10h 48m1 stop
$380United Airlines
Sat, Jan 31 - Wed, Feb 4
Multiple Airlines Logo
10:06 am - 12:30 am
STL
-
YUL
13h 24m1 stop
Multiple Airlines Logo
4:35 pm - 9:21 am
YUL
-
STL
17h 46m1 stop
$402Multiple Airlines
Sun, Jan 18 - Sun, Jan 25
United Airlines Logo
9:55 am - 6:40 pm
STL
-
YUL
7h 45m1 stop
United Airlines Logo
9:25 am - 10:59 pm
YUL
-
STL
14h 34m1 stop
$407United Airlines
Sun, Feb 15 - Wed, Feb 18
American Airlines Logo
6:43 pm - 3:08 pm
STL
-
YUL
19h 25m1 stop
American Airlines Logo
3:50 pm - 10:20 am
YUL
-
STL
19h 30m1 stop
$408American Airlines
Sat, Jan 31 - Wed, Feb 4
United Airlines Logo
9:55 am - 9:17 pm
STL
-
YUL
10h 22m1 stop
United Airlines Logo
9:15 am - 9:00 pm
YUL
-
STL
12h 45m2 stops
$417United Airlines
Sun, Feb 15 - Wed, Feb 18
American Airlines Logo
11:05 am - 3:08 pm
STL
-
YUL
27h 03m1 stop
American Airlines Logo
7:00 am - 9:15 pm
YUL
-
STL
15h 15m2 stops
$418American Airlines
Sat, Jan 31 - Wed, Feb 4
Multiple Airlines Logo
5:11 pm - 12:30 am
STL
-
YUL
30h 19m1 stop
Multiple Airlines Logo
4:35 pm - 11:33 pm
YUL
-
STL
7h 58m1 stop
$425Multiple Airlines
Sat, Jan 17 - Sat, Jan 24
American Airlines Logo
6:00 am - 3:05 pm
STL
-
YUL
8h 05m1 stop
American Airlines Logo
12:58 pm - 11:28 pm
YUL
-
STL
11h 30m2 stops
$441American Airlines
Tue, Feb 17 - Fri, Feb 20

American Airlines flights from St. Louis to Montreal

Our best American Airlines deals on St. Louis to Montreal flight tickets
American Airlines
Feb 17
STL6:00 amLambert-St Louis
8h 05m
1 stop
YUL3:05 pmMontreal Pierre Elliott Trudeau Intl
Feb 20
YUL3:55 pmMontreal Pierre Elliott Trudeau Intl
18h 39m
1 stop
STL9:34 amLambert-St Louis
$273
Find similar
American Airlines
Jan 31
STL6:43 pmLambert-St Louis
19h 25m
1 stop
YUL3:08 pmMontreal Pierre Elliott Trudeau Intl
Feb 4
YUL3:50 pmMontreal Pierre Elliott Trudeau Intl
19h 30m
1 stop
STL10:20 amLambert-St Louis
$408
Find similar
American Airlines
Jan 31
STL11:05 amLambert-St Louis
27h 03m
1 stop
YUL3:08 pmMontreal Pierre Elliott Trudeau Intl
Feb 4
YUL7:00 amMontreal Pierre Elliott Trudeau Intl
15h 15m
2 stops
STL9:15 pmLambert-St Louis
$418
Find similar

United Airlines flights from St. Louis to Montreal

Our best United Airlines deals on St. Louis to Montreal flight tickets
United Airlines
Jan 31
STL4:49 pmLambert-St Louis
22h 12m
1 stop
YUL4:01 pmMontreal Pierre Elliott Trudeau Intl
Feb 4
YUL1:10 pmMontreal Pierre Elliott Trudeau Intl
10h 48m
1 stop
STL10:58 pmLambert-St Louis
$380
Find similar
United Airlines
Feb 15
STL9:55 amLambert-St Louis
7h 45m
1 stop
YUL6:40 pmMontreal Pierre Elliott Trudeau Intl
Feb 18
YUL9:25 amMontreal Pierre Elliott Trudeau Intl
14h 34m
1 stop
STL10:59 pmLambert-St Louis
$407
Find similar
United Airlines
Feb 15
STL9:55 amLambert-St Louis
10h 22m
1 stop
YUL9:17 pmMontreal Pierre Elliott Trudeau Intl
Feb 18
YUL9:15 amMontreal Pierre Elliott Trudeau Intl
12h 45m
2 stops
STL9:00 pmLambert-St Louis
$417
Find similar

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 832,500 searches. Data last updated December 4, 2025.
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

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 2/17

6:00 am-3:05 pm

1 stop8h 05m

Montreal Pierre Elliott Trudeau Intl

Fri 2/20

3:55 pm-9:34 am

1 stop18h 39m

$273

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sun 1/18

5:11 pm-8:14 pm

2 stops26h 03m

Montreal Pierre Elliott Trudeau Intl

Sun 1/25

4:35 pm-9:21 am

1 stop17h 46m

$375

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sat 1/31

11:20 am-10:20 am

1 stop22h 00m

Montreal Pierre Elliott Trudeau Intl

Wed 2/4

1:10 pm-10:58 pm

1 stop10h 48m

$380

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sun 1/18

10:06 am-12:30 am

1 stop13h 24m

Montreal Pierre Elliott Trudeau Intl

Sun 1/25

4:35 pm-9:21 am

1 stop17h 46m

$402

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sun 2/15

9:55 am-6:40 pm

1 stop7h 45m

Montreal Pierre Elliott Trudeau Intl

Wed 2/18

9:25 am-10:59 pm

1 stop14h 34m

$407

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sat 1/31

6:43 pm-3:08 pm

1 stop19h 25m

Montreal Pierre Elliott Trudeau Intl

Wed 2/4

3:50 pm-10:20 am

1 stop19h 30m

$408

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sun 2/15

9:55 am-9:17 pm

1 stop10h 22m

Montreal Pierre Elliott Trudeau Intl

Wed 2/18

9:15 am-9:00 pm

2 stops12h 45m

$417

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sat 1/31

11:05 am-3:08 pm

1 stop27h 03m

Montreal Pierre Elliott Trudeau Intl

Wed 2/4

7:00 am-9:15 pm

2 stops15h 15m

$418

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sat 1/17

5:11 pm-12:30 am

1 stop30h 19m

Montreal Pierre Elliott Trudeau Intl

Sat 1/24

4:35 pm-11:33 pm

1 stop7h 58m

$425

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 2/17

6:00 am-3:05 pm

1 stop8h 05m

Montreal Pierre Elliott Trudeau Intl

Fri 2/20

12:58 pm-11:28 pm

2 stops11h 30m

$441

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 day to depart on your flight to Montreal?

The cheapest day to depart from St. Louis to Montreal is on a Tuesday when prices can be found for as low as $1,031. Flights from St. Louis to Montreal on a Friday will generally be more expensive and average around $1,202. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

What is the cheapest time of day to depart on your flight to Montreal?

Our most recent data shows that the best time of day to fly to Montreal is in the evening. Flights from St. Louis to Montreal during this time can be as low as $266. At noon is when there is more demand to fly to Montreal, so prices are often more expensive at around $1,093 per ticket.

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 Lambert-St Louis to Montreal flights?

There are 3 cabin classes available to choose from on Lambert-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.

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

Best Price Found

$800

Fastest flight time

2h 35m

Direct flights

Thu, Fri and Sat

Airports in Montreal

1 airport
The best one-way flight to Montreal from St. Louis in the past 72 hours is $800. The best round-trip flight deal from St. Louis to Montreal found on momondo in the last 72 hours is $810.
The fastest flight from St. Louis to Montreal takes 2h 35m
Direct flights go from St. Louis to Montreal on Thursday, Friday and Saturday. The only airline offering direct flights is Air Canada.
There is 1 airport near Montreal: Montreal Pierre Elliott Trudeau Intl (YUL)
Search flight deals

  • How far is Lambert-St Louis to Montreal by plane?

    The distance between Lambert-St Louis and Montreal is about 973.0 mi. A reasonable flight in good conditions will take 4h 20m.

  • 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 are updated daily.

  • How many operators does momondo search for flights from Lambert-St Louis Airport to Montreal?

  • How old do you have to be to fly from Lambert-St Louis Airport to Montreal?

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, 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 required travel and health documents for your Montreal trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Montreal. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

  • What is the most popular plane model from St. Louis to Montreal?

  • What is the most popular airline from St. Louis to Montreal?

Best airlines flying from St. Louis to Montreal

Compare and see reviews for airlines that fly from St. Louis to Montreal with momondo
Airline
Rating
Free Cancellation
Price
United AirlinesPriceFrom $246Free CancellationRating
7.4
9,064 reviews
Search United Airlines flights
DeltaPriceFrom $255Free CancellationRating
7.9
8,011 reviews
Search Delta flights
Air CanadaPriceFrom $285Free CancellationRating
7.1
10,500 reviews
Search Air Canada flights
American AirlinesPriceFrom $348Free CancellationRating
7.2
11,043 reviews
Search American Airlines flights

Why use momondo?

Why should I use momondo to find a flight deal from St. Louis to Montreal?

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from St. Louis to Montreal for you.

Can I find flights from St. Louis to Montreal with flexible booking policies on momondo?

All flight searches from St. Louis to Montreal on momondo can be filtered to show those which offer flexible booking policies.

How can momondo help me find flights from St. Louis to Montreal?

Once all potential St. Louis to Montreal 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 St. Louis to Montreal right now. Can momondo alert me if prices change?

Yes. momondo can track prices for St. Louis to Montreal flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

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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 9.4 mi from Montreal
Montreal St Hubert Airport
Montreal Pierre Elliott Trudeau Intl Airport