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Cheap flights from St. Louis to Montreal from $198

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 10/13. 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

Discover deals from 900+ travel sites with momondo.

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
5:13 pm - 11:43 amSTL  Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl
17h 30m1 stop Chicago O'Hare Intl
American Airlines Logo
12:31 pm - 8:44 pmYUL  Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis
9h 13m1 stop Chicago O'Hare Intl
$486American Airlines
Sat, Sep 5 - Fri, Sep 11
American Airlines Logo
5:00 am - 4:52 pmSTL  Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl
10h 52m1 stop Chicago O'Hare Intl
American Airlines Logo
12:30 pm - 12:09 amYUL  Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis
12h 39m1 stop Chicago O'Hare Intl
$514American Airlines
Sat, Oct 17 - Wed, Oct 21
Multiple Airlines Logo
8:34 pm - 2:08 pmSTL  Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl
16h 34m2 stops Orlando Newark
Multiple Airlines Logo
9:30 am - 8:14 pmYUL  Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis
11h 44m1 stop New York LaGuardia
$527Multiple Airlines
Mon, Oct 19 - Thu, Oct 22
American Airlines Logo
6:00 am - 4:50 pmSTL  Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl
9h 50m1 stop Chicago O'Hare Intl
American Airlines Logo
5:34 pm - 8:24 amYUL  Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis
15h 50m1 stop Chicago O'Hare Intl
$545American Airlines
Tue, Sep 1 - Fri, Sep 4
Air Canada Logo
12:10 pm - 3:41 pmSTL  Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl
2h 31mnonstop
Air Canada Logo
4:55 pm - 6:41 pmYUL  Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis
2h 46mnonstop
$609Air Canada
Mon, Oct 19 - Thu, Oct 22
Air Canada Logo
12:10 pm - 3:41 pmSTL  Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl
2h 31mnonstop
Air Canada Logo
4:55 pm - 6:41 pmYUL  Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis
2h 46mnonstop
$609Air Canada
Sat, Oct 17 - Wed, Oct 21
Air Canada Logo
12:10 pm - 3:41 pmSTL  Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl
2h 31mnonstop
Air Canada Logo
4:55 pm - 6:41 pmYUL  Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis
2h 46mnonstop
$609Air Canada
Tue, Oct 6 - Mon, Oct 12
United Airlines Logo
9:43 am - 9:26 pmSTL  Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl
10h 43m1 stop Chicago O'Hare Intl
United Airlines Logo
8:40 am - 8:00 pmYUL  Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis
12h 20m1 stop Chicago O'Hare Intl
$637United Airlines
Tue, Sep 15 - Sat, Sep 19
United Airlines Logo
8:00 am - 5:30 pmSTL  Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl
8h 30m1 stop Chicago O'Hare Intl
United Airlines Logo
3:25 pm - 11:38 pmYUL  Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis
9h 13m1 stop Newark
$732United Airlines
Tue, Sep 1 - Fri, Sep 4
United Airlines Logo
7:00 am - 4:10 pmSTL  Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl
8h 10m1 stop Newark
United Airlines Logo
6:10 am - 11:57 amYUL  Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis
6h 47m1 stop Chicago O'Hare Intl
$765United Airlines
Tue, Sep 1 - Thu, Sep 17

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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
Sep 5
STL5:13 pmLambert-St Louis
17h 30m
1 stop
YUL11:43 amMontreal Pierre Elliott Trudeau Intl
Sep 11
YUL12:31 pmMontreal Pierre Elliott Trudeau Intl
9h 13m
1 stop
STL8:44 pmLambert-St Louis
$486
American Airlines
Oct 17
STL5:00 amLambert-St Louis
10h 52m
1 stop
YUL4:52 pmMontreal Pierre Elliott Trudeau Intl
Oct 21
YUL12:30 pmMontreal Pierre Elliott Trudeau Intl
12h 39m
1 stop
STL12:09 amLambert-St Louis
$514
American Airlines
Sep 1
STL6:00 amLambert-St Louis
9h 50m
1 stop
YUL4:50 pmMontreal Pierre Elliott Trudeau Intl
Sep 4
YUL5:34 pmMontreal Pierre Elliott Trudeau Intl
15h 50m
1 stop
STL8:24 amLambert-St Louis
$545

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

Our best WestJet deals on St. Louis to Montreal Pierre Elliott Trudeau Intl Airport flight tickets
WestJet
Aug 27
STL6:30 amLambert-St Louis
4h 26m
1 stop
YUL11:56 amMontreal Pierre Elliott Trudeau Intl
Aug 30
YUL7:00 amMontreal Pierre Elliott Trudeau Intl
5h 46m
1 stop
STL11:46 amLambert-St Louis
$589
WestJet
Oct 19
STL5:35 pmLambert-St Louis
5h 24m
1 stop
YUL11:59 pmMontreal Pierre Elliott Trudeau Intl
Oct 22
YUL9:30 amMontreal Pierre Elliott Trudeau Intl
11h 44m
1 stop
STL8:14 pmLambert-St Louis
$591
WestJet
Sep 15
STL4:59 pmLambert-St Louis
23h 37m
1 stop
YUL5:36 pmMontreal Pierre Elliott Trudeau Intl
Sep 16
YUL8:00 pmMontreal Pierre Elliott Trudeau Intl
14h 00m
2 stops
STL9:00 amLambert-St Louis
$607

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 August 10, 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

St. LouisMontreal

STL Lambert-St Louis - YUL Montreal Pierre Elliott Trudeau Intl

STLYUL

Lambert-St Louis

Sat 9/5

5:13 pm-11:43 am

1 stop17h 30m

Montreal Pierre Elliott Trudeau Intl

Fri 9/11

12:31 pm-8:44 pm

1 stop9h 13m

$486

St. LouisMontreal

STL Lambert-St Louis - YUL Montreal Pierre Elliott Trudeau Intl

STLYUL

Lambert-St Louis

Sat 10/17

5:00 am-4:52 pm

1 stop10h 52m

Montreal Pierre Elliott Trudeau Intl

Wed 10/21

12:30 pm-12:09 am

1 stop12h 39m

$514

St. LouisMontreal

STL Lambert-St Louis - YUL Montreal Pierre Elliott Trudeau Intl

STLYUL

Lambert-St Louis

Mon 10/19

8:34 pm-2:08 pm

2 stops16h 34m

Montreal Pierre Elliott Trudeau Intl

Thu 10/22

9:30 am-8:14 pm

1 stop11h 44m

$527

St. LouisMontreal

STL Lambert-St Louis - YUL Montreal Pierre Elliott Trudeau Intl

STLYUL

Lambert-St Louis

Tue 9/1

6:00 am-4:50 pm

1 stop9h 50m

Montreal Pierre Elliott Trudeau Intl

Fri 9/4

5:34 pm-8:24 am

1 stop15h 50m

$545
Quickest round-trip

St. LouisMontreal

STL Lambert-St Louis - YUL Montreal Pierre Elliott Trudeau Intl

STLYUL

Lambert-St Louis

Mon 10/19

12:10 pm-3:41 pm

Nonstop2h 31m

Montreal Pierre Elliott Trudeau Intl

Thu 10/22

4:55 pm-6:41 pm

Nonstop2h 46m

$609

St. LouisMontreal

STL Lambert-St Louis - YUL Montreal Pierre Elliott Trudeau Intl

STLYUL

Lambert-St Louis

Sat 10/17

12:10 pm-3:41 pm

Nonstop2h 31m

Montreal Pierre Elliott Trudeau Intl

Wed 10/21

4:55 pm-6:41 pm

Nonstop2h 46m

$609

St. LouisMontreal

STL Lambert-St Louis - YUL Montreal Pierre Elliott Trudeau Intl

STLYUL

Lambert-St Louis

Tue 10/6

12:10 pm-3:41 pm

Nonstop2h 31m

Montreal Pierre Elliott Trudeau Intl

Mon 10/12

4:55 pm-6:41 pm

Nonstop2h 46m

$609

St. LouisMontreal

STL Lambert-St Louis - YUL Montreal Pierre Elliott Trudeau Intl

STLYUL

Lambert-St Louis

Tue 9/15

9:43 am-9:26 pm

1 stop10h 43m

Montreal Pierre Elliott Trudeau Intl

Sat 9/19

8:40 am-8:00 pm

1 stop12h 20m

$637

St. LouisMontreal

STL Lambert-St Louis - YUL Montreal Pierre Elliott Trudeau Intl

STLYUL

Lambert-St Louis

Tue 9/1

8:00 am-5:30 pm

1 stop8h 30m

Montreal Pierre Elliott Trudeau Intl

Fri 9/4

3:25 pm-11:38 pm

1 stop9h 13m

$732

St. LouisMontreal

STL Lambert-St Louis - YUL Montreal Pierre Elliott Trudeau Intl

STLYUL

Lambert-St Louis

Tue 9/1

7:00 am-4:10 pm

1 stop8h 10m

Montreal Pierre Elliott Trudeau Intl

Thu 9/17

6:10 am-11:57 am

1 stop6h 47m

$765

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?

Prices are currently typical for flights on this route.

Typical prices usually range from $296 to $1,089.
The lowest price recently found on this route was $486.

What is the cheapest month to fly to Montreal Pierre Elliott Trudeau Intl Airport?

The month of December is another great option to travel to Montreal Pierre Elliott Trudeau Intl Airport, with average flight prices from St. Louis averaging around $564.

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 Tuesday. Travelers who choose to depart for Montreal Pierre Elliott Trudeau Intl Airport on a Tuesday will often find tickets for as low as $950. Flights from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport on a Friday will generally be more expensive and average around $1,207. 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 $1,006. 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 $1,067.

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 St. Louis to Montreal Pierre Elliott Trudeau Intl Airport flights?

There are 4 cabin classes available to choose from on St. Louis to Montreal Pierre Elliott Trudeau Intl Airport 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 17% 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

$519

Fastest flight time

2h 31m

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 $519. 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 $946.
The fastest flight from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport takes 2h 31m
Direct flights go from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport every day.
Search flight deals

Frequently asked questions about flying from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport

  • 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 31m.

  • 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
Air CanadaPriceFrom $257Free CancellationRating
7.1
11,460 reviews
Search Air Canada flights
United AirlinesPriceFrom $296Free CancellationRating
7.4
10,103 reviews
Search United Airlines flights

  • United Airlines Flights From St. Louis to Montreal Pierre Elliott Trudeau Intl Airport

    The lowest priced United Airlines flight from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport from the last 72 hours was $296. Generally, United Airlines has 7 flights on this route every week with an average price of $754. United Airlines is rated 7.4/10 by our users.

  • Air Canada Flights From St. Louis to Montreal Pierre Elliott Trudeau Intl Airport

    $257 is the best Air Canada flight deal from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport found on momondo over the last 72 hours. The average Air Canada ticket price found was closer to $649, however, with flight time and availability significantly affecting the price. Air Canada (7.1/10 from 11,460 user reviews) flies into Montreal Pierre Elliott Trudeau Intl Airport from St. Louis 7 times in an average week so prices can vary.

Traveling to a place near Montreal?

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

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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