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Cheap flights from St. Louis to Montreal from $143

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 11/15. 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

American Airlines Logo
6:10 am - 4:33 pmSTL-YUL
9h 23m1 stop
American Airlines Logo
5:15 pm - 9:26 amYUL-STL
17h 11m1 stop
$348American Airlines
Find Deal
Wed, Sep 10 - Mon, Sep 15
American Airlines Logo
5:25 pm - 4:33 pmSTL-YUL
22h 08m1 stop
American Airlines Logo
10:34 am - 9:53 pmYUL-STL
12h 19m2 stops
$358American Airlines
Find Deal
Sat, Sep 13 - Sat, Sep 20
Logo
12:20 pm - 12:45 amSTL-YUL
11h 25m1 stop
Logo
6:45 am - 12:00 pmYUL-STL
30h 15m3 stops
$476
Find Deal
Thu, Nov 6 - Sun, Nov 9
Air Canada Logo
1:30 pm - 5:00 pmSTL-YUL
2h 30mnonstop
Air Canada Logo
9:15 am - 3:18 pmYUL-STL
7h 03m1 stop
$520Air Canada
Find Deal
Wed, Sep 10 - Wed, Sep 17
Delta Logo
10:45 am - 9:47 pmSTL-YUL
10h 02m2 stops
Delta Logo
11:00 am - 8:05 pmYUL-STL
10h 05m1 stop
$527Delta
Find Deal
Wed, Sep 10 - Wed, Sep 17
Air Canada Logo
4:05 pm - 9:52 pmSTL-YUL
4h 47m1 stop
Air Canada Logo
11:10 am - 3:29 pmYUL-STL
5h 19m1 stop
$532Air Canada
Find Deal
Thu, Nov 6 - Mon, Nov 10
Logo
12:20 pm - 10:45 amSTL-YUL
21h 25m3 stops
Logo
6:45 am - 12:00 pmYUL-STL
30h 15m3 stops
$538
Find Deal
Thu, Nov 6 - Sun, Nov 9
United Airlines Logo
3:23 pm - 10:40 amSTL-YUL
18h 17m1 stop
United Airlines Logo
8:20 am - 10:49 amYUL-STL
27h 29m1 stop
$546United Airlines
Find Deal
Tue, Oct 14 - Sun, Oct 19
United Airlines Logo
3:20 pm - 5:26 pmSTL-YUL
25h 06m1 stop
United Airlines Logo
8:00 pm - 3:44 pmYUL-STL
20h 44m2 stops
$556United Airlines
Find Deal
Mon, Sep 1 - Fri, Sep 5
Delta Logo
10:45 am - 9:47 pmSTL-YUL
10h 02m2 stops
Delta Logo
11:00 am - 8:34 pmYUL-STL
10h 34m2 stops
$581Delta
Find Deal
Wed, Sep 10 - Wed, Sep 17

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 10
STL6:10 amLambert-St Louis
9h 23m
1 stop
YUL4:33 pmMontreal Pierre Elliott Trudeau Intl
Sep 15
YUL5:15 pmMontreal Pierre Elliott Trudeau Intl
17h 11m
1 stop
STL9:26 amLambert-St Louis
$348
Find similar
American Airlines
Sep 13
STL5:25 pmLambert-St Louis
22h 08m
1 stop
YUL4:33 pmMontreal Pierre Elliott Trudeau Intl
Sep 20
YUL10:34 amMontreal Pierre Elliott Trudeau Intl
12h 19m
2 stops
STL9:53 pmLambert-St Louis
$358
Find similar
American Airlines
Sep 7
STL6:05 amLambert-St Louis
9h 28m
1 stop
YUL4:33 pmMontreal Pierre Elliott Trudeau Intl
Sep 8
YUL5:15 pmMontreal Pierre Elliott Trudeau Intl
17h 11m
1 stop
STL9:26 amLambert-St Louis
$379
Find similar

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
Sep 10
STL1:30 pmLambert-St Louis
2h 30m
YUL5:00 pmMontreal Pierre Elliott Trudeau Intl
Sep 17
YUL9:15 amMontreal Pierre Elliott Trudeau Intl
7h 03m
1 stop
STL3:18 pmLambert-St Louis
$520
Find similar
Air Canada
Nov 6
STL4:05 pmLambert-St Louis
4h 47m
1 stop
YUL9:52 pmMontreal Pierre Elliott Trudeau Intl
Nov 10
YUL11:10 amMontreal Pierre Elliott Trudeau Intl
5h 19m
1 stop
STL3:29 pmLambert-St Louis
$532
Find similar
Air Canada
Sep 1
STL1:30 pmLambert-St Louis
2h 30m
YUL5:00 pmMontreal Pierre Elliott Trudeau Intl
Sep 5
YUL6:10 pmMontreal Pierre Elliott Trudeau Intl
2h 47m
STL7:57 pmLambert-St Louis
$550
Find similar

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 July 31, 2025.
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

Wed 9/10

6:10 am-4:33 pm

1 stop9h 23m

Montreal Pierre Elliott Trudeau Intl

Mon 9/15

5:15 pm-9:26 am

1 stop17h 11m

$348

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sat 9/13

5:25 pm-4:33 pm

1 stop22h 08m

Montreal Pierre Elliott Trudeau Intl

Sat 9/20

10:34 am-9:53 pm

2 stops12h 19m

$358

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 11/6

12:20 pm-12:45 am

1 stop11h 25m

Montreal Pierre Elliott Trudeau Intl

Sun 11/9

6:45 am-12:00 pm

3 stops30h 15m

$476

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Wed 9/10

1:30 pm-5:00 pm

Nonstop2h 30m

Montreal Pierre Elliott Trudeau Intl

Wed 9/17

9:15 am-3:18 pm

1 stop7h 03m

$520

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Wed 9/10

10:45 am-9:47 pm

2 stops10h 02m

Montreal Pierre Elliott Trudeau Intl

Wed 9/17

11:00 am-8:05 pm

1 stop10h 05m

$527

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 11/6

4:05 pm-9:52 pm

1 stop4h 47m

Montreal Pierre Elliott Trudeau Intl

Mon 11/10

11:10 am-3:29 pm

1 stop5h 19m

$532

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 11/6

12:20 pm-10:45 am

3 stops21h 25m

Montreal Pierre Elliott Trudeau Intl

Sun 11/9

6:45 am-12:00 pm

3 stops30h 15m

$538

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 10/14

3:23 pm-10:40 am

1 stop18h 17m

Montreal Pierre Elliott Trudeau Intl

Sun 10/19

8:20 am-10:49 am

1 stop27h 29m

$546

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 9/1

3:20 pm-5:26 pm

1 stop25h 06m

Montreal Pierre Elliott Trudeau Intl

Fri 9/5

8:00 pm-3:44 pm

2 stops20h 44m

$556

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Wed 9/10

10:45 am-9:47 pm

2 stops10h 02m

Montreal Pierre Elliott Trudeau Intl

Wed 9/17

11:00 am-8:34 pm

2 stops10h 34m

$581

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 July is another great option to travel to Montreal Pierre Elliott Trudeau Intl Airport, with average flight prices from St. Louis averaging around $356.

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 $1,033. Flights from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport on a Friday will generally be more expensive and average around $1,221. 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 evening 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 $282. Flying to Montreal Pierre Elliott Trudeau Intl Airport in the evening 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 $1,133.

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?

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

$143

Fastest flight time

2h 30m

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 $143. 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 $348.
The fastest flight from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport takes 2h 30m
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 30m.

  • 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
United AirlinesPriceFrom $246Free CancellationRating
7.4
8,900 reviews
Search United Airlines flights
DeltaPriceFrom $255Free CancellationRating
8.0
7,981 reviews
Search Delta flights
Air CanadaPriceFrom $259Free CancellationRating
7.1
9,851 reviews
Search Air Canada flights
American AirlinesPriceFrom $330Free CancellationRating
7.2
10,000 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 $246. Generally, United Airlines has 7 flights on this route every week with an average price of $689. United Airlines is rated 7.4/10 by our users.

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

    $259 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 $688, however, with flight time and availability significantly affecting the price. Air Canada (7.1/10 from 9,851 user reviews) flies into Montreal Pierre Elliott Trudeau Intl Airport from St. Louis 4 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
Longueuil
Dorval
Brossard
Magog
Trois-Rivières
Cornwall
Drummondville
Saint-Sauveur
Sherbrooke
Boucherville
Montebello
Saint-Jean-sur-Richelieu
Bromont
Sutton
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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