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Cheap flights from St. Louis to Montreal from $354

This is the cheapest round-trip flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to Montreal departing on 2/23. 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 - 11:28 pm
YUL
-
STL
8h 33m1 stop
$354American Airlines
Mon, Feb 23 - Thu, Feb 26
American Airlines Logo
10:04 am - 10:44 pm
STL
-
YUL
11h 40m2 stops
American Airlines Logo
3:55 pm - 11:28 pm
YUL
-
STL
8h 33m1 stop
$364American Airlines
Mon, Feb 23 - Thu, Feb 26
Multiple Airlines Logo
12:12 pm - 12:30 am
STL
-
YUL
11h 18m1 stop
Multiple Airlines Logo
6:45 am - 11:33 pm
YUL
-
STL
17h 48m2 stops
$410Multiple Airlines
Sat, Feb 7 - Mon, Feb 9
Multiple Airlines Logo
8:22 pm - 3:10 pm
STL
-
YUL
17h 48m2 stops
Multiple Airlines Logo
4:35 pm - 11:33 pm
YUL
-
STL
7h 58m1 stop
$414Multiple Airlines
Fri, Jan 30 - Fri, Feb 6
American Airlines Logo
6:00 am - 3:05 pm
STL
-
YUL
8h 05m1 stop
American Airlines Logo
3:55 pm - 9:29 am
YUL
-
STL
18h 34m1 stop
$420American Airlines
Thu, Feb 26 - Mon, Mar 2
American Airlines Logo
6:43 pm - 3:08 pm
STL
-
YUL
19h 25m1 stop
American Airlines Logo
3:50 pm - 1:03 pm
YUL
-
STL
22h 13m1 stop
$426American Airlines
Sat, Jan 31 - Sat, Feb 7
United Airlines Logo
4:49 pm - 2:00 pm
STL
-
YUL
20h 11m1 stop
United Airlines Logo
1:10 pm - 10:58 pm
YUL
-
STL
10h 48m1 stop
$452United Airlines
Sat, Jan 31 - Wed, Feb 4
American Airlines Logo
6:44 pm - 3:08 pm
STL
-
YUL
19h 24m1 stop
American Airlines Logo
3:50 pm - 10:20 am
YUL
-
STL
19h 30m1 stop
$471American Airlines
Thu, Feb 5 - Mon, Feb 9
American Airlines Logo
6:43 pm - 3:08 pm
STL
-
YUL
19h 25m1 stop
American Airlines Logo
7:30 am - 6:13 pm
YUL
-
STL
11h 43m2 stops
$482American Airlines
Sat, Jan 31 - Sat, Feb 7
Multiple Airlines Logo
5:11 pm - 12:43 am
STL
-
YUL
30h 32m2 stops
Multiple Airlines Logo
6:02 pm - 6:51 am
YUL
-
STL
13h 49m1 stop
$494Multiple Airlines
Mon, Jan 19 - Fri, Jan 23

American Airlines flights from St. Louis to Montreal

Our best American Airlines deals on St. Louis to Montreal flight tickets
American Airlines
Feb 23
STL6:00 amLambert-St Louis
8h 05m
1 stop
YUL3:05 pmMontreal Pierre Elliott Trudeau Intl
Feb 26
YUL3:55 pmMontreal Pierre Elliott Trudeau Intl
8h 33m
1 stop
STL11:28 pmLambert-St Louis
$354
Find similar
American Airlines
Feb 23
STL10:04 amLambert-St Louis
11h 40m
2 stops
YUL10:44 pmMontreal Pierre Elliott Trudeau Intl
Feb 26
YUL3:55 pmMontreal Pierre Elliott Trudeau Intl
8h 33m
1 stop
STL11:28 pmLambert-St Louis
$364
Find similar
American Airlines
Feb 26
STL6:00 amLambert-St Louis
8h 05m
1 stop
YUL3:05 pmMontreal Pierre Elliott Trudeau Intl
Mar 2
YUL3:55 pmMontreal Pierre Elliott Trudeau Intl
18h 34m
1 stop
STL9:29 amLambert-St Louis
$420
Find similar

Delta flights from St. Louis to Montreal

Our best Delta deals on St. Louis to Montreal flight tickets
Delta
Feb 7
STL1:20 pmLambert-St Louis
23h 02m
1 stop
YUL1:22 pmMontreal Pierre Elliott Trudeau Intl
Feb 9
YUL7:30 pmMontreal Pierre Elliott Trudeau Intl
22h 12m
1 stop
STL4:42 pmLambert-St Louis
$503
Find similar
Delta
Mar 17
STL1:34 pmLambert-St Louis
17h 56m
1 stop
YUL8:30 amMontreal Pierre Elliott Trudeau Intl
Mar 19
YUL7:30 pmMontreal Pierre Elliott Trudeau Intl
14h 14m
1 stop
STL8:44 amLambert-St Louis
$572
Find similar
Delta
Jan 19
STL6:35 amLambert-St Louis
11h 02m
2 stops
YUL6:37 pmMontreal Pierre Elliott Trudeau Intl
Jan 23
YUL9:34 amMontreal Pierre Elliott Trudeau Intl
12h 03m
2 stops
STL8:37 pmLambert-St Louis
$581
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 18, 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

Mon 2/23

6:00 am-3:05 pm

1 stop8h 05m

Montreal Pierre Elliott Trudeau Intl

Thu 2/26

3:55 pm-11:28 pm

1 stop8h 33m

$354

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 2/23

10:04 am-10:44 pm

2 stops11h 40m

Montreal Pierre Elliott Trudeau Intl

Thu 2/26

3:55 pm-11:28 pm

1 stop8h 33m

$364

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sat 2/7

12:12 pm-12:30 am

1 stop11h 18m

Montreal Pierre Elliott Trudeau Intl

Mon 2/9

6:45 am-11:33 pm

2 stops17h 48m

$410

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Fri 1/30

8:22 pm-3:10 pm

2 stops17h 48m

Montreal Pierre Elliott Trudeau Intl

Fri 2/6

4:35 pm-11:33 pm

1 stop7h 58m

$414

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 2/26

6:00 am-3:05 pm

1 stop8h 05m

Montreal Pierre Elliott Trudeau Intl

Mon 3/2

3:55 pm-9:29 am

1 stop18h 34m

$420

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

Sat 2/7

3:50 pm-1:03 pm

1 stop22h 13m

$426

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sat 1/31

4:49 pm-2:00 pm

1 stop20h 11m

Montreal Pierre Elliott Trudeau Intl

Wed 2/4

1:10 pm-10:58 pm

1 stop10h 48m

$452

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 2/5

6:44 pm-3:08 pm

1 stop19h 24m

Montreal Pierre Elliott Trudeau Intl

Mon 2/9

3:50 pm-10:20 am

1 stop19h 30m

$471

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

Sat 2/7

7:30 am-6:13 pm

2 stops11h 43m

$482

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 1/19

5:11 pm-12:43 am

2 stops30h 32m

Montreal Pierre Elliott Trudeau Intl

Fri 1/23

6:02 pm-6:51 am

1 stop13h 49m

$494

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

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 $1,026. Flights from St. Louis to Montreal on a Friday will generally be more expensive and average around $1,193. 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 $1,090 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

$466

Fastest flight time

2h 35m

Direct flights

Mon, Thu, Fri and Sat

Airports in Montreal

2 airports
The best one-way flight to Montreal from St. Louis in the past 72 hours is $466. The best round-trip flight deal from St. Louis to Montreal found on momondo in the last 72 hours is $752.
The fastest flight from St. Louis to Montreal takes 2h 35m
Direct flights go from St. Louis to Montreal on Monday, Thursday, Friday and Saturday. There are no airlines offering direct flights.
There are 2 airports in Montreal. From St. Louis there are direct flights to 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 2h 35m.

  • 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
9,093 reviews
Search United Airlines flights
DeltaPriceFrom $255Free CancellationRating
7.9
8,009 reviews
Search Delta flights
Air CanadaPriceFrom $318Free CancellationRating
7.1
10,534 reviews
Search Air Canada flights
American AirlinesPriceFrom $348Free CancellationRating
7.2
11,054 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