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Cheap flights from St. Louis to Montreal from $173

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 6/8. 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.
Air Canada Logo
1:05 pm - 4:40 pm
STL
-
YUL
2h 35mnonstop
Air Canada Logo
6:30 pm - 8:25 pm
YUL
-
STL
2h 55mnonstop
$464Air Canada
Thu, May 28 - Mon, Jun 1
Air Canada Logo
1:05 pm - 4:40 pm
STL
-
YUL
2h 35mnonstop
Air Canada Logo
6:30 pm - 8:25 pm
YUL
-
STL
2h 55mnonstop
$470Air Canada
Thu, May 28 - Mon, Jun 1
Air Canada Logo
1:05 pm - 4:40 pm
STL
-
YUL
2h 35mnonstop
Air Canada Logo
2:10 pm - 8:09 pm
YUL
-
STL
6h 59m
1 stop
$473Air Canada
Thu, May 28 - Mon, Jun 1
Air Canada Logo
7:05 am - 3:26 pm
STL
-
YUL
7h 21m
2 stops
Air Canada Logo
6:30 pm - 8:25 pm
YUL
-
STL
2h 55mnonstop
$476Air Canada
Thu, May 28 - Mon, Jun 1
Air Canada Logo
1:05 pm - 4:40 pm
STL
-
YUL
2h 35mnonstop
Air Canada Logo
8:10 am - 12:06 pm
YUL
-
STL
4h 56m
1 stop
$477Air Canada
Thu, May 28 - Mon, Jun 1
Air Canada Logo
7:05 am - 3:26 pm
STL
-
YUL
7h 21m
2 stops
Air Canada Logo
4:10 pm - 8:09 pm
YUL
-
STL
4h 59m
1 stop
$479Air Canada
Thu, May 28 - Mon, Jun 1
Air Canada Logo
7:05 am - 10:19 pm
STL
-
YUL
14h 14m
2 stops
Air Canada Logo
6:30 pm - 8:25 pm
YUL
-
STL
2h 55mnonstop
$490Air Canada
Thu, May 28 - Sun, May 31
Multiple Airlines Logo
7:20 pm - 6:15 pm
STL
-
YUL
21h 55m
3 stops
Multiple Airlines Logo
6:30 am - 6:36 pm
YUL
-
STL
13h 06m
3 stops
$492Multiple Airlines
Thu, May 28 - Mon, Jun 1
Multiple Airlines Logo
7:05 am - 3:26 pm
STL
-
YUL
7h 21m
2 stops
Multiple Airlines Logo
6:30 am - 6:36 pm
YUL
-
STL
13h 06m
3 stops
$502Multiple Airlines
Thu, May 28 - Mon, Jun 1
Air Canada Logo
2:15 pm - 11:31 pm
STL
-
YUL
8h 16m
1 stop
Air Canada Logo
6:00 am - 12:06 pm
YUL
-
STL
7h 06m
1 stop
$504Air Canada
Thu, May 28 - Mon, Jun 1

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
Jun 27
STL6:30 amLambert-St Louis
8h 50m
1 stop
YUL4:20 pmMontreal Pierre Elliott Trudeau Intl
Jun 29
YUL6:50 pmMontreal Pierre Elliott Trudeau Intl
6h 06m
1 stop
STL11:56 pmLambert-St Louis
$595
Delta
May 22
STL1:27 pmLambert-St Louis
9h 30m
1 stop
YUL11:57 pmMontreal Pierre Elliott Trudeau Intl
May 24
YUL12:49 pmMontreal Pierre Elliott Trudeau Intl
5h 27m
1 stop
STL5:16 pmLambert-St Louis
$687
Delta
May 13
STL5:45 pmLambert-St Louis
13h 54m
1 stop
YUL8:39 amMontreal Pierre Elliott Trudeau Intl
May 17
YUL6:00 amMontreal Pierre Elliott Trudeau Intl
4h 29m
1 stop
STL9:29 amLambert-St Louis
$973

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 28
STL1:05 pmLambert-St Louis
2h 35m
YUL4:40 pmMontreal Pierre Elliott Trudeau Intl
Jun 1
YUL6:30 pmMontreal Pierre Elliott Trudeau Intl
2h 55m
STL8:25 pmLambert-St Louis
$464
Air Canada
May 28
STL1:05 pmLambert-St Louis
2h 35m
YUL4:40 pmMontreal Pierre Elliott Trudeau Intl
Jun 1
YUL6:30 pmMontreal Pierre Elliott Trudeau Intl
2h 55m
STL8:25 pmLambert-St Louis
$470
Air Canada
May 28
STL1:05 pmLambert-St Louis
2h 35m
YUL4:40 pmMontreal Pierre Elliott Trudeau Intl
Jun 1
YUL2:10 pmMontreal Pierre Elliott Trudeau Intl
6h 59m
1 stop
STL8:09 pmLambert-St Louis
$473

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 May 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
Quickest round-trip

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 5/28

1:05 pm-4:40 pm

Nonstop2h 35m

Montreal Pierre Elliott Trudeau Intl

Mon 6/1

6:30 pm-8:25 pm

Nonstop2h 55m

$464

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 5/28

1:05 pm-4:40 pm

Nonstop2h 35m

Montreal Pierre Elliott Trudeau Intl

Mon 6/1

6:30 pm-8:25 pm

Nonstop2h 55m

$470

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 5/28

1:05 pm-4:40 pm

Nonstop2h 35m

Montreal Pierre Elliott Trudeau Intl

Mon 6/1

2:10 pm-8:09 pm

1 stop6h 59m

$473

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 5/28

7:05 am-3:26 pm

2 stops7h 21m

Montreal Pierre Elliott Trudeau Intl

Mon 6/1

6:30 pm-8:25 pm

Nonstop2h 55m

$476

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 5/28

1:05 pm-4:40 pm

Nonstop2h 35m

Montreal Pierre Elliott Trudeau Intl

Mon 6/1

8:10 am-12:06 pm

1 stop4h 56m

$477

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 5/28

7:05 am-3:26 pm

2 stops7h 21m

Montreal Pierre Elliott Trudeau Intl

Mon 6/1

4:10 pm-8:09 pm

1 stop4h 59m

$479

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 5/28

7:05 am-10:19 pm

2 stops14h 14m

Montreal Pierre Elliott Trudeau Intl

Sun 5/31

6:30 pm-8:25 pm

Nonstop2h 55m

$490

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 5/28

7:20 pm-6:15 pm

3 stops21h 55m

Montreal Pierre Elliott Trudeau Intl

Mon 6/1

6:30 am-6:36 pm

3 stops13h 06m

$492

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 5/28

7:05 am-3:26 pm

2 stops7h 21m

Montreal Pierre Elliott Trudeau Intl

Mon 6/1

6:30 am-6:36 pm

3 stops13h 06m

$502

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 5/28

2:15 pm-11:31 pm

1 stop8h 16m

Montreal Pierre Elliott Trudeau Intl

Mon 6/1

6:00 am-12:06 pm

1 stop7h 06m

$504

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 July is another great option to travel to Montreal Pierre Elliott Trudeau Intl Airport, with average flight prices from St. Louis averaging around $326.

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 $926. Flights from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport on a Friday will generally be more expensive and average around $1,199. 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 $994. 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 $1,008.

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

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

$462

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 $462. 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 $1,056.
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
DeltaPriceFrom $212Free CancellationRating
7.9
8,455 reviews
Search Delta flights
Air CanadaPriceFrom $318Free CancellationRating
7.1
11,012 reviews
Search Air Canada flights
United AirlinesPriceFrom $333Free CancellationRating
7.4
9,694 reviews
Search United Airlines flights
American AirlinesPriceFrom $348Free CancellationRating
7.1
11,667 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 $333. Generally, United Airlines has 14 flights on this route every week with an average price of $765. United Airlines is rated 7.4/10 by our users.

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

    $318 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 $647, however, with flight time and availability significantly affecting the price. Air Canada (7.1/10 from 11,012 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
Magog
Boucherville
Drummondville
Saint-Jean-sur-Richelieu
Montebello
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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