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Cheap flights from St. Louis to Montreal from $144

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 4/29. 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 - 4:53 pm
STL
-
YUL
9h 53m
1 stop
American Airlines Logo
12:30 pm - 8:30 pm
YUL
-
STL
9h 00m
1 stop
$443American Airlines
Wed, Jun 3 - Tue, Jun 9
Multiple Airlines Logo
4:59 pm - 12:30 am
STL
-
YUL
30h 31m
1 stop
Multiple Airlines Logo
8:00 am - 6:50 am
YUL
-
STL
23h 50m
2 stops
$444Multiple Airlines
Tue, Apr 21 - Sun, Apr 26
American Airlines Logo
6:00 am - 4:53 pm
STL
-
YUL
9h 53m
1 stop
American Airlines Logo
5:33 pm - 8:32 am
YUL
-
STL
15h 59m
1 stop
$460American Airlines
Wed, Jun 3 - Tue, Jun 9
Multiple Airlines Logo
4:59 pm - 12:30 am
STL
-
YUL
30h 31m
1 stop
Multiple Airlines Logo
6:45 am - 6:50 am
YUL
-
STL
25h 05m
2 stops
$463Multiple Airlines
Tue, Apr 21 - Tue, Apr 28
United Airlines Logo
9:10 am - 6:56 pm
STL
-
YUL
8h 46m
1 stop
United Airlines Logo
9:45 am - 9:52 pm
YUL
-
STL
13h 07m
1 stop
$508United Airlines
Tue, Apr 21 - Sat, Apr 25
American Airlines Logo
5:21 pm - 11:44 am
STL
-
YUL
17h 23m
1 stop
American Airlines Logo
12:30 pm - 11:46 pm
YUL
-
STL
12h 16m
1 stop
$510American Airlines
Tue, Apr 28 - Thu, Apr 30
American Airlines Logo
8:03 pm - 11:44 am
STL
-
YUL
14h 41m
1 stop
American Airlines Logo
12:30 pm - 11:46 pm
YUL
-
STL
12h 16m
1 stop
$521American Airlines
Sun, May 3 - Tue, May 5
American Airlines Logo
8:03 pm - 11:44 am
STL
-
YUL
14h 41m
1 stop
American Airlines Logo
12:30 pm - 10:17 pm
YUL
-
STL
10h 47m
1 stop
$531American Airlines
Mon, May 4 - Wed, May 6
Multiple Airlines Logo
4:59 pm - 12:30 am
STL
-
YUL
30h 31m
1 stop
Multiple Airlines Logo
4:25 pm - 6:50 am
YUL
-
STL
15h 25m
2 stops
$535Multiple Airlines
Tue, Apr 28 - Thu, Apr 30
American Airlines Logo
8:03 pm - 11:44 am
STL
-
YUL
14h 41m
1 stop
American Airlines Logo
1:03 pm - 11:46 pm
YUL
-
STL
11h 43m
2 stops
$541American Airlines
Mon, May 4 - Wed, May 6

American Airlines flights from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport

Our best American Airlines deals on St. Louis to Montreal Pierre Elliott Trudeau Intl Airport flight tickets
American Airlines
Jun 3
STL6:00 amLambert-St Louis
9h 53m
1 stop
YUL4:53 pmMontreal Pierre Elliott Trudeau Intl
Jun 9
YUL12:30 pmMontreal Pierre Elliott Trudeau Intl
9h 00m
1 stop
STL8:30 pmLambert-St Louis
$443
American Airlines
Jun 3
STL6:00 amLambert-St Louis
9h 53m
1 stop
YUL4:53 pmMontreal Pierre Elliott Trudeau Intl
Jun 9
YUL5:33 pmMontreal Pierre Elliott Trudeau Intl
15h 59m
1 stop
STL8:32 amLambert-St Louis
$460
American Airlines
Apr 28
STL5:21 pmLambert-St Louis
17h 23m
1 stop
YUL11:44 amMontreal Pierre Elliott Trudeau Intl
Apr 30
YUL12:30 pmMontreal Pierre Elliott Trudeau Intl
12h 16m
1 stop
STL11:46 pmLambert-St Louis
$510

Air Canada flights from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport

Our best Air Canada deals on St. Louis to Montreal Pierre Elliott Trudeau Intl Airport flight tickets
Air Canada
May 4
STL1:05 pmLambert-St Louis
2h 35m
YUL4:40 pmMontreal Pierre Elliott Trudeau Intl
May 11
YUL6:30 pmMontreal Pierre Elliott Trudeau Intl
2h 55m
STL8:25 pmLambert-St Louis
$564
Air Canada
May 1
STL1:00 pmLambert-St Louis
2h 35m
YUL4:35 pmMontreal Pierre Elliott Trudeau Intl
May 3
YUL6:30 pmMontreal Pierre Elliott Trudeau Intl
2h 55m
STL8:25 pmLambert-St Louis
$566
Air Canada
May 1
STL1:00 pmLambert-St Louis
2h 35m
YUL4:35 pmMontreal Pierre Elliott Trudeau Intl
May 3
YUL4:10 pmMontreal Pierre Elliott Trudeau Intl
4h 59m
1 stop
STL8:09 pmLambert-St Louis
$569

momondo Fare Finder

 
Customize your flight search to find flights from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport 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 March 25, 2026.
Use the filters below to find and compare flights from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport 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

Wed 6/3

6:00 am-4:53 pm

1 stop9h 53m

Montreal Pierre Elliott Trudeau Intl

Tue 6/9

12:30 pm-8:30 pm

1 stop9h 00m

$443

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 4/21

4:59 pm-12:30 am

1 stop30h 31m

Montreal Pierre Elliott Trudeau Intl

Sun 4/26

8:00 am-6:50 am

2 stops23h 50m

$444

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Wed 6/3

6:00 am-4:53 pm

1 stop9h 53m

Montreal Pierre Elliott Trudeau Intl

Tue 6/9

5:33 pm-8:32 am

1 stop15h 59m

$460

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 4/21

4:59 pm-12:30 am

1 stop30h 31m

Montreal Pierre Elliott Trudeau Intl

Tue 4/28

6:45 am-6:50 am

2 stops25h 05m

$463

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 4/21

9:10 am-6:56 pm

1 stop8h 46m

Montreal Pierre Elliott Trudeau Intl

Sat 4/25

9:45 am-9:52 pm

1 stop13h 07m

$508

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 4/28

5:21 pm-11:44 am

1 stop17h 23m

Montreal Pierre Elliott Trudeau Intl

Thu 4/30

12:30 pm-11:46 pm

1 stop12h 16m

$510

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sun 5/3

8:03 pm-11:44 am

1 stop14h 41m

Montreal Pierre Elliott Trudeau Intl

Tue 5/5

12:30 pm-11:46 pm

1 stop12h 16m

$521

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 5/4

8:03 pm-11:44 am

1 stop14h 41m

Montreal Pierre Elliott Trudeau Intl

Wed 5/6

12:30 pm-10:17 pm

1 stop10h 47m

$531

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 4/28

4:59 pm-12:30 am

1 stop30h 31m

Montreal Pierre Elliott Trudeau Intl

Thu 4/30

4:25 pm-6:50 am

2 stops15h 25m

$535

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 5/4

8:03 pm-11:44 am

1 stop14h 41m

Montreal Pierre Elliott Trudeau Intl

Wed 5/6

1:03 pm-11:46 pm

2 stops11h 43m

$541

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 Pierre Elliott Trudeau Intl Airport

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 Pierre Elliott Trudeau Intl Airport?

What is the cheapest day to depart on your flight to Montreal Pierre Elliott Trudeau Intl Airport?

The cheapest day to depart from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport is on a Sunday. Travelers who choose to depart for Montreal Pierre Elliott Trudeau Intl Airport on a Sunday will often find tickets for as low as $942. Flights from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport on a Friday will generally be more expensive and average around $1,166. 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 Pierre Elliott Trudeau Intl Airport?

In the morning is the cheapest time of day to fly from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport when you can find flight prices for as low as $965. Flying to Montreal Pierre Elliott Trudeau Intl Airport in the morning is an ideal time because this is during off-peak travel hours. Flights at noon are often more expensive with an average ticket price of $1,031.

What is the cheapest Lambert-St Louis to Montreal Pierre Elliott Trudeau Intl flight route?

Fly from Lambert-St Louis to Montreal Pierre Elliott Trudeau Intl for the best Lambert-St Louis - Montreal Pierre Elliott Trudeau Intl flight prices

What cabin class options are available on Lambert-St Louis to Montreal Pierre Elliott Trudeau Intl flights?

There are 3 cabin classes available to choose from on Lambert-St Louis to Montreal Pierre Elliott Trudeau Intl 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 Pierre Elliott Trudeau Intl Airport flights?

You could potentially save up to 13% on your flight if you consider stops on a St. Louis to Montreal Pierre Elliott Trudeau Intl Airport flight.

When to book flights from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport

Are you open to changing your travel dates? Check out the ideal times to fly from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap St. Louis to Montreal Pierre Elliott Trudeau Intl Airport (STL to YUL) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport

Best Price Found

$521

Fastest flight time

2h 32m

Direct flights

Every day
The best one-way flight to Montreal Pierre Elliott Trudeau Intl Airport from St. Louis in the past 72 hours is $521. The best round-trip flight deal from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport found on momondo in the last 72 hours is $893.
The fastest flight from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport takes 2h 32m
Direct flights go from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport every day.
Search flight deals

  • How far is Lambert-St Louis to Montreal Pierre Elliott Trudeau Intl by plane?

    There are 963.7 mi between Lambert-St Louis and Montreal Pierre Elliott Trudeau Intl. A reasonable flight in good conditions will take 2h 32m.

  • When did momondo last update prices for flights from Lambert-St Louis Airport to Montreal Pierre Elliott Trudeau Intl Airport?

    Prices for flights from Lambert-St Louis Airport to Montreal Pierre Elliott Trudeau Intl Airport are updated daily.

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

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

    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 Pierre Elliott Trudeau Intl Airport.

  • What documentation or ID do you need to fly to Montreal Pierre Elliott Trudeau Intl Airport?

    The required travel and health documents for your Montreal Pierre Elliott Trudeau Intl Airport 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 Pierre Elliott Trudeau Intl Airport. 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 Pierre Elliott Trudeau Intl Airport?

  • What is the most popular airline from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport?

Best airlines flying from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport

Compare and see reviews for airlines that fly from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport with momondo
Airline
Rating
Free Cancellation
Price
DeltaPriceFrom $212Free CancellationRating
7.9
8,326 reviews
Search Delta flights
United AirlinesPriceFrom $239Free CancellationRating
7.4
9,477 reviews
Search United Airlines flights
Air CanadaPriceFrom $318Free CancellationRating
7.1
10,838 reviews
Search Air Canada flights
American AirlinesPriceFrom $348Free CancellationRating
7.1
11,494 reviews
Search American Airlines flights

Traveling to a place near Montreal?

Book flights to Montreal if you plan to visit one of these locations
Laval
Dorval
Brossard
Longueuil
Trois-Rivières
Cornwall
Saint-Sauveur
Sherbrooke
Magog
Boucherville
Drummondville
Saint-Jean-sur-Richelieu
Montebello
Bromont
North Hatley
Sutton

Why use momondo?

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

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from St. Louis to Montreal. momondo saves you time and could save you money on your trip.

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 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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