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Cheap flights from St. Louis to Montreal from $138

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 3/3. 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
8:03 pm - 11:44 am
STL
-
YUL
14h 41m
1 stop
American Airlines Logo
12:30 pm - 10:19 pm
YUL
-
STL
10h 49m
1 stop
$329American Airlines
Tue, May 5 - Sat, May 9
American Airlines Logo
8:03 pm - 11:44 am
STL
-
YUL
14h 41m
1 stop
American Airlines Logo
1:03 pm - 11:56 pm
YUL
-
STL
11h 53m
2 stops
$339American Airlines
Tue, May 5 - Sat, May 9
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
$342American Airlines
Tue, Apr 7 - Thu, Apr 9
American Airlines Logo
4:30 pm - 11:44 am
STL
-
YUL
18h 14m
1 stop
American Airlines Logo
12:30 pm - 10:19 pm
YUL
-
STL
10h 49m
1 stop
$369American Airlines
Tue, May 5 - Sat, May 9
American Airlines Logo
8:03 pm - 11:44 am
STL
-
YUL
14h 41m
1 stop
American Airlines Logo
1:03 pm - 11:56 pm
YUL
-
STL
11h 53m
2 stops
$379American Airlines
Tue, May 5 - Sat, May 9
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
$394American Airlines
Fri, Apr 17 - Tue, Apr 21
American Airlines Logo
5:21 pm - 11:44 am
STL
-
YUL
17h 23m
1 stop
American Airlines Logo
12:30 pm - 10:17 pm
YUL
-
STL
10h 47m
1 stop
$422American Airlines
Fri, Apr 17 - Mon, Apr 20
American Airlines Logo
7:00 am - 10:58 pm
STL
-
YUL
14h 58m
1 stop
American Airlines Logo
12:30 pm - 11:56 pm
YUL
-
STL
12h 26m
1 stop
$464American Airlines
Sun, May 3 - Sat, May 9
American Airlines Logo
6:29 am - 3:27 pm
STL
-
YUL
7h 58m
1 stop
American Airlines Logo
1:03 pm - 11:56 pm
YUL
-
STL
11h 53m
2 stops
$474American Airlines
Sun, May 3 - Sat, May 9
American Airlines Logo
7:05 am - 10:48 pm
STL
-
YUL
14h 43m
1 stop
American Airlines Logo
3:45 pm - 8:26 am
YUL
-
STL
17h 41m
1 stop
$482American Airlines
Fri, Apr 3 - Mon, Apr 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
May 5
STL8:03 pmLambert-St Louis
14h 41m
1 stop
YUL11:44 amMontreal Pierre Elliott Trudeau Intl
May 9
YUL12:30 pmMontreal Pierre Elliott Trudeau Intl
10h 49m
1 stop
STL10:19 pmLambert-St Louis
$329
American Airlines
May 5
STL8:03 pmLambert-St Louis
14h 41m
1 stop
YUL11:44 amMontreal Pierre Elliott Trudeau Intl
May 9
YUL1:03 pmMontreal Pierre Elliott Trudeau Intl
11h 53m
2 stops
STL11:56 pmLambert-St Louis
$339
American Airlines
May 5
STL4:30 pmLambert-St Louis
18h 14m
1 stop
YUL11:44 amMontreal Pierre Elliott Trudeau Intl
May 9
YUL12:30 pmMontreal Pierre Elliott Trudeau Intl
10h 49m
1 stop
STL10:19 pmLambert-St Louis
$369

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
Mar 16
STL4:05 pmLambert-St Louis
6h 27m
1 stop
YUL11:32 pmMontreal Pierre Elliott Trudeau Intl
Mar 23
YUL8:00 amMontreal Pierre Elliott Trudeau Intl
8h 29m
1 stop
STL3:29 pmLambert-St Louis
$528
Air Canada
May 3
STL1:00 pmLambert-St Louis
2h 35m
YUL4:35 pmMontreal Pierre Elliott Trudeau Intl
May 9
YUL6:10 pmMontreal Pierre Elliott Trudeau Intl
2h 55m
STL8:05 pmLambert-St Louis
$570
Air Canada
May 3
STL1:00 pmLambert-St Louis
2h 35m
YUL4:35 pmMontreal Pierre Elliott Trudeau Intl
May 9
YUL8:10 amMontreal Pierre Elliott Trudeau Intl
4h 56m
1 stop
STL12:06 pmLambert-St Louis
$583

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 February 3, 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

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 5/5

8:03 pm-11:44 am

1 stop14h 41m

Montreal Pierre Elliott Trudeau Intl

Sat 5/9

12:30 pm-10:19 pm

1 stop10h 49m

$329

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 5/5

8:03 pm-11:44 am

1 stop14h 41m

Montreal Pierre Elliott Trudeau Intl

Sat 5/9

1:03 pm-11:56 pm

2 stops11h 53m

$339

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 4/7

5:21 pm-11:44 am

1 stop17h 23m

Montreal Pierre Elliott Trudeau Intl

Thu 4/9

12:30 pm-11:46 pm

1 stop12h 16m

$342

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 5/5

4:30 pm-11:44 am

1 stop18h 14m

Montreal Pierre Elliott Trudeau Intl

Sat 5/9

12:30 pm-10:19 pm

1 stop10h 49m

$369

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 5/5

8:03 pm-11:44 am

1 stop14h 41m

Montreal Pierre Elliott Trudeau Intl

Sat 5/9

1:03 pm-11:56 pm

2 stops11h 53m

$379

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Fri 4/17

5:21 pm-11:44 am

1 stop17h 23m

Montreal Pierre Elliott Trudeau Intl

Tue 4/21

12:30 pm-11:46 pm

1 stop12h 16m

$394

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Fri 4/17

5:21 pm-11:44 am

1 stop17h 23m

Montreal Pierre Elliott Trudeau Intl

Mon 4/20

12:30 pm-10:17 pm

1 stop10h 47m

$422

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sun 5/3

7:00 am-10:58 pm

1 stop14h 58m

Montreal Pierre Elliott Trudeau Intl

Sat 5/9

12:30 pm-11:56 pm

1 stop12h 26m

$464

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sun 5/3

6:29 am-3:27 pm

1 stop7h 58m

Montreal Pierre Elliott Trudeau Intl

Sat 5/9

1:03 pm-11:56 pm

2 stops11h 53m

$474

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Fri 4/3

7:05 am-10:48 pm

1 stop14h 43m

Montreal Pierre Elliott Trudeau Intl

Mon 4/6

3:45 pm-8:26 am

1 stop17h 41m

$482

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 cheapest month to fly to Montreal Pierre Elliott Trudeau Intl Airport?

The month of May is another great option to travel to Montreal Pierre Elliott Trudeau Intl Airport, with average flight prices from St. Louis averaging around $576.

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 Monday. Travelers who choose to depart for Montreal Pierre Elliott Trudeau Intl Airport on a Monday will often find tickets for as low as $999. Flights from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport on a Friday will generally be more expensive and average around $1,170. 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 $906. 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 $1,069.

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 10% 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

$299

Fastest flight time

2h 32m

Direct flights

Mon, Tue, Wed, Fri, Sat and Sun
The best one-way flight to Montreal Pierre Elliott Trudeau Intl Airport from St. Louis in the past 72 hours is $299. 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 $738.
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 on Monday, Tuesday, Wednesday, Friday, Saturday and Sunday. There are no airlines offering direct flights.
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
8,138 reviews
Search Delta flights
United AirlinesPriceFrom $246Free CancellationRating
7.4
9,236 reviews
Search United Airlines flights
Air CanadaPriceFrom $285Free CancellationRating
7.1
10,684 reviews
Search Air Canada flights
American AirlinesPriceFrom $348Free CancellationRating
7.2
11,218 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
Magog
Boucherville
Sherbrooke
Drummondville
Montebello
Saint-Jean-sur-Richelieu
Bromont
Saint-Sauveur
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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