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Cheap flights from St. Louis to Montreal from $206

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 8/14. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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.
WestJet Logo
6:40 am - 4:19 pm
STL
-
YUL
8h 39m
1 stop
WestJet Logo
8:00 pm - 9:00 am
YUL
-
STL
14h 00m
2 stops
$475WestJet
Mon, Sep 28 - Mon, Sep 28
American Airlines Logo
6:00 am - 4:53 pm
STL
-
YUL
9h 53m
1 stop
American Airlines Logo
5:34 pm - 8:24 am
YUL
-
STL
15h 50m
1 stop
$511American Airlines
Tue, Aug 18 - Fri, Aug 21
Multiple Airlines Logo
4:57 pm - 6:15 pm
STL
-
YUL
24h 18m
2 stops
Multiple Airlines Logo
6:47 pm - 11:53 pm
YUL
-
STL
6h 06m
1 stop
$531Multiple Airlines
Fri, Jul 24 - Wed, Jul 29
American Airlines Logo
3:20 pm - 9:48 am
STL
-
YUL
17h 28m
1 stop
American Airlines Logo
12:30 pm - 12:16 am
YUL
-
STL
12h 46m
1 stop
$533American Airlines
Wed, Jul 8 - Wed, Jul 15
Multiple Airlines Logo
6:34 pm - 6:15 pm
STL
-
YUL
22h 41m
2 stops
Multiple Airlines Logo
7:44 pm - 11:47 am
YUL
-
STL
17h 03m
1 stop
$535Multiple Airlines
Tue, Jul 21 - Tue, Jul 28
Multiple Airlines Logo
4:57 pm - 6:15 pm
STL
-
YUL
24h 18m
2 stops
Multiple Airlines Logo
6:47 pm - 11:58 pm
YUL
-
STL
6h 11m
1 stop
$536Multiple Airlines
Fri, Aug 14 - Mon, Aug 17
Multiple Airlines Logo
4:57 pm - 6:15 pm
STL
-
YUL
24h 18m
2 stops
Multiple Airlines Logo
6:47 pm - 11:58 pm
YUL
-
STL
6h 11m
1 stop
$538Multiple Airlines
Fri, Aug 14 - Mon, Aug 17
Multiple Airlines Logo
4:57 pm - 6:15 pm
STL
-
YUL
24h 18m
2 stops
Multiple Airlines Logo
6:47 pm - 11:58 pm
YUL
-
STL
6h 11m
1 stop
$539Multiple Airlines
Fri, Aug 14 - Mon, Aug 17
Multiple Airlines Logo
4:57 pm - 6:15 pm
STL
-
YUL
24h 18m
2 stops
Multiple Airlines Logo
6:00 am - 9:31 am
YUL
-
STL
4h 31m
1 stop
$541Multiple Airlines
Mon, Jul 20 - Sat, Jul 25
Air Canada Logo
12:10 pm - 3:42 pm
STL
-
YUL
2h 32mnonstop
Air Canada Logo
4:55 pm - 6:42 pm
YUL
-
STL
2h 47mnonstop
$546Air Canada
Fri, Aug 7 - Mon, Aug 10

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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
Sep 28
STL6:40 amLambert-St Louis
8h 39m
1 stop
YUL4:19 pmMontreal Pierre Elliott Trudeau Intl
Sep 28
YUL8:00 pmMontreal Pierre Elliott Trudeau Intl
14h 00m
2 stops
STL9:00 amLambert-St Louis
$475
WestJet
Aug 14
STL5:23 pmLambert-St Louis
5h 29m
1 stop
YUL11:52 pmMontreal Pierre Elliott Trudeau Intl
Aug 17
YUL6:51 pmMontreal Pierre Elliott Trudeau Intl
6h 07m
1 stop
STL11:58 pmLambert-St Louis
$622
WestJet
Aug 14
STL6:25 pmLambert-St Louis
4h 05m
1 stop
YUL11:30 pmMontreal Pierre Elliott Trudeau Intl
Aug 17
YUL6:47 pmMontreal Pierre Elliott Trudeau Intl
6h 11m
1 stop
STL11:58 pmLambert-St Louis
$624

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

Our best Delta deals on St. Louis to Montreal Pierre Elliott Trudeau Intl Airport flight tickets
Delta
Sep 1
STL6:00 amLambert-St Louis
11h 54m
2 stops
YUL6:54 pmMontreal Pierre Elliott Trudeau Intl
Sep 4
YUL2:29 pmMontreal Pierre Elliott Trudeau Intl
7h 02m
1 stop
STL8:31 pmLambert-St Louis
$626
Delta
Sep 25
STL4:59 pmLambert-St Louis
5h 58m
1 stop
YUL11:57 pmMontreal Pierre Elliott Trudeau Intl
Sep 27
YUL7:00 amMontreal Pierre Elliott Trudeau Intl
9h 54m
1 stop
STL3:54 pmLambert-St Louis
$632
Delta
Jun 28
STL6:00 amLambert-St Louis
11h 54m
2 stops
YUL6:54 pmMontreal Pierre Elliott Trudeau Intl
Jul 3
YUL9:30 amMontreal Pierre Elliott Trudeau Intl
12h 09m
2 stops
STL8:39 pmLambert-St Louis
$991

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 June 22, 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 - YUL

STLYUL

Lambert-St Louis

Mon 9/28

6:40 am-4:19 pm

1 stop8h 39m

Montreal Pierre Elliott Trudeau Intl

Mon 9/28

8:00 pm-9:00 am

2 stops14h 00m

$475

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 8/18

6:00 am-4:53 pm

1 stop9h 53m

Montreal Pierre Elliott Trudeau Intl

Fri 8/21

5:34 pm-8:24 am

1 stop15h 50m

$511

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Fri 7/24

4:57 pm-6:15 pm

2 stops24h 18m

Montreal Pierre Elliott Trudeau Intl

Wed 7/29

6:47 pm-11:53 pm

1 stop6h 06m

$531

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Wed 7/8

3:20 pm-9:48 am

1 stop17h 28m

Montreal Pierre Elliott Trudeau Intl

Wed 7/15

12:30 pm-12:16 am

1 stop12h 46m

$533

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 7/21

6:34 pm-6:15 pm

2 stops22h 41m

Montreal Pierre Elliott Trudeau Intl

Tue 7/28

7:44 pm-11:47 am

1 stop17h 03m

$535

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Fri 8/14

4:57 pm-6:15 pm

2 stops24h 18m

Montreal Pierre Elliott Trudeau Intl

Mon 8/17

6:47 pm-11:58 pm

1 stop6h 11m

$536

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Fri 8/14

4:57 pm-6:15 pm

2 stops24h 18m

Montreal Pierre Elliott Trudeau Intl

Mon 8/17

6:47 pm-11:58 pm

1 stop6h 11m

$538

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Fri 8/14

4:57 pm-6:15 pm

2 stops24h 18m

Montreal Pierre Elliott Trudeau Intl

Mon 8/17

6:47 pm-11:58 pm

1 stop6h 11m

$539

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 7/20

4:57 pm-6:15 pm

2 stops24h 18m

Montreal Pierre Elliott Trudeau Intl

Sat 7/25

6:00 am-9:31 am

1 stop4h 31m

$541
Quickest round-trip

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Fri 8/7

12:10 pm-3:42 pm

Nonstop2h 32m

Montreal Pierre Elliott Trudeau Intl

Mon 8/10

4:55 pm-6:42 pm

Nonstop2h 47m

$546

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 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 Wednesday. Travelers who choose to depart for Montreal Pierre Elliott Trudeau Intl Airport on a Wednesday will often find tickets for as low as $877. Flights from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport on a Friday will generally be more expensive and average around $1,179. 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?

At noon 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 $984. Flying to Montreal Pierre Elliott Trudeau Intl Airport at noon is an ideal time because this is during off-peak travel hours. Flights in the morning are often more expensive with an average ticket price of $1,008.

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 3 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?

No. A direct flight is the cheapest option for a flight between St. Louis to Montreal Pierre Elliott Trudeau Intl Airport.

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

$403

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 $403. 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 $755.
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
11,238 reviews
Search Air Canada flights
United AirlinesPriceFrom $296Free CancellationRating
7.4
9,875 reviews
Search United Airlines flights
American AirlinesPriceFrom $348Free CancellationRating
7.1
11,739 reviews
Search American 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 $759. 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 $624, however, with flight time and availability significantly affecting the price. Air Canada (7.1/10 from 11,238 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
Longueuil
Brossard
Trois-Rivières
Cornwall
Saint-Sauveur
Sherbrooke
Drummondville
Boucherville
Magog
Montebello
Saint-Jean-sur-Richelieu
Bromont
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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