What is the cheapest airline that flies from Lambert-St Louis to Montreal?

American Airlines is the most popular carrier operating from Lambert-St Louis to Montreal

Which layover airport has the shortest travel time from St. Louis to Montreal?

Flights connecting via Detroit (DTW) have the shortest average one-way travel time: 4h 27m.

What airlines fly to Montreal?

Air Canada, United Airlines and Delta are the top three most popular airlines that fly to Montreal from St. Louis according to our data. Air Canada is the first choice among our users, with 57% of people opting to fly with this airline when traveling to Montreal. Keep in mind that there are 3 different airlines that fly to Montreal on a routine basis, so you have a few additional options to choose from.

Which layover airport offers the lowest fares from St. Louis to Montreal?

Flights via Toronto (YYZ) offer the lowest average round-trip price of $668.

Which layover airport has the shortest connection time from St. Louis to Montreal?

Detroit (DTW) has the shortest average layover time for this route: 1h 09m.

Which airport is the most popular layover for flights between St. Louis and Montreal?

Toronto (YYZ) was the most common stop: 67% of momondo users choosing 1-stop flights on this route connected there.

When did momondo last update prices for flights from Lambert-St Louis Airport to Montreal?

Prices for flights from Lambert-St Louis Airport to Montreal are updated daily.

How many operators does momondo search for flights from Lambert-St Louis Airport to Montreal?

As of November 2026, there are 3 operators available to choose from for flights from Lambert-St Louis Airport to Montreal.

How old do you have to be to fly from Lambert-St Louis Airport to Montreal?

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.

What documentation or ID do you need to fly to Montreal?

The required travel and health documents for your Montreal 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. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

$236 Cheap Flights from St. Louis to Montreal in 2026/27

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from St. Louis to Montreal

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Enter your travel dates to find the best prices.

8:24 pm - 11:28 amSTL Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl

14h 04m1 stop Chicago O'Hare Intl

4:00 pm - 8:29 amYUL Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis

17h 29m1 stop Chicago O'Hare Intl

$497American Airlines

Mon, Dec 14 - Thu, Dec 17

12:02 pm - 4:00 pmSTL Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl

26h 58m3 stops Atlanta Hartsfield-Jackson Newark Toronto Island

1:40 pm - 10:53 amYUL Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis

22h 13m3 stops Toronto Island Washington, D.C. Dulles Intl Atlanta Hartsfield-Jackson

$525Multiple Airlines

Mon, Dec 14 - Thu, Dec 17

8:24 pm - 11:28 amSTL Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl

14h 04m1 stop Chicago O'Hare Intl

12:08 pm - 12:02 amYUL Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis

12h 54m1 stop Chicago O'Hare Intl

$529American Airlines

Fri, Dec 11 - Mon, Dec 14

8:30 am - 7:05 pmSTL Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl

9h 35m1 stop Chicago O'Hare Intl

6:00 am - 6:09 pmYUL Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis

13h 09m1 stop Chicago O'Hare Intl

$652United Airlines

Mon, Nov 23 - Fri, Nov 27

7:18 am - 7:07 pmSTL Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl

10h 49m1 stop Chicago O'Hare Intl

1:10 pm - 9:22 pmYUL Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis

9h 12m1 stop Chicago O'Hare Intl

$652United Airlines

Wed, Dec 23 - Tue, Dec 29

9:32 am - 6:54 pmSTL Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl

8h 22m1 stop New York LaGuardia

7:44 pm - 12:01 pmYUL Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis

17h 17m1 stop New York LaGuardia

$660Delta

Wed, Dec 9 - Fri, Dec 11

6:32 am - 6:54 pmSTL Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl

11h 22m2 stops Detroit Metropolitan Wayne County New York LaGuardia

7:44 pm - 12:01 pmYUL Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis

17h 17m1 stop New York LaGuardia

$670Delta

Wed, Dec 9 - Fri, Dec 11

6:32 am - 6:54 pmSTL Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl

11h 22m2 stops Detroit Metropolitan Wayne County New York LaGuardia

7:44 pm - 3:53 pmYUL Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis

21h 09m2 stops New York LaGuardia Detroit Metropolitan Wayne County

$675Delta

Wed, Dec 9 - Fri, Dec 11

8:30 am - 7:02 pmSTL Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl

9h 32m1 stop Chicago O'Hare Intl

6:00 am - 2:34 pmYUL Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis

9h 34m1 stop Chicago O'Hare Intl

$738United Airlines

Sun, Nov 22 - Fri, Nov 27

9:40 am - 9:25 amSTL Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl

22h 45m3 stops Chicago O'Hare Intl Vancouver Intl Toronto Pearson Intl

3:00 pm - 3:26 pmYUL Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis

25h 26m3 stops Ottawa Vancouver Intl Toronto Pearson Intl

$1,609Air Canada

Thu, Nov 19 - Sat, Nov 21

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Delta flights from St. Louis to Montreal

Our best Delta deals on St. Louis to Montreal flight tickets

Delta

Dec 5

STL2:00 pmLambert-St Louis

22h 35m

1 stop

YUL1:35 pmMontreal Pierre Elliott Trudeau Intl

Dec 9

YUL7:44 pmMontreal Pierre Elliott Trudeau Intl

14h 08m

1 stop

STL8:52 amLambert-St Louis

$648

Delta

Dec 9

STL9:32 amLambert-St Louis

8h 22m

1 stop

YUL6:54 pmMontreal Pierre Elliott Trudeau Intl

Dec 11

YUL7:44 pmMontreal Pierre Elliott Trudeau Intl

17h 17m

1 stop

STL12:01 pmLambert-St Louis

$660

Delta

Dec 9

STL6:32 amLambert-St Louis

11h 22m

2 stops

YUL6:54 pmMontreal Pierre Elliott Trudeau Intl

Dec 11

YUL7:44 pmMontreal Pierre Elliott Trudeau Intl

17h 17m

1 stop

STL12:01 pmLambert-St Louis

$670

American Airlines flights from St. Louis to Montreal

Our best American Airlines deals on St. Louis to Montreal flight tickets

American Airlines

Dec 5

STL5:23 pmLambert-St Louis

17h 05m

1 stop

YUL11:28 amMontreal Pierre Elliott Trudeau Intl

Dec 9

YUL12:08 pmMontreal Pierre Elliott Trudeau Intl

12h 54m

1 stop

STL12:02 amLambert-St Louis

$497

American Airlines

Dec 5

STL11:25 amLambert-St Louis

10h 23m

2 stops

YUL10:48 pmMontreal Pierre Elliott Trudeau Intl

Dec 9

YUL12:08 pmMontreal Pierre Elliott Trudeau Intl

12h 54m

1 stop

STL12:02 amLambert-St Louis

$507

American Airlines

Dec 11

STL8:24 pmLambert-St Louis

14h 04m

1 stop

YUL11:28 amMontreal Pierre Elliott Trudeau Intl

Dec 14

YUL12:08 pmMontreal Pierre Elliott Trudeau Intl

12h 54m

1 stop

STL12:02 amLambert-St Louis

$529

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

Mon 12/14

8:24 pm-11:28 am

1 stop14h 04m

Montreal Pierre Elliott Trudeau Intl

Thu 12/17

4:00 pm-8:29 am

1 stop17h 29m

$497

St. LouisMontreal

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

STLYUL

Lambert-St Louis

Mon 12/14

12:02 pm-4:00 pm

3 stops26h 58m

Montreal Pierre Elliott Trudeau Intl

Thu 12/17

1:40 pm-10:53 am

3 stops22h 13m

$525

St. LouisMontreal

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

STLYUL

Lambert-St Louis

Fri 12/11

8:24 pm-11:28 am

1 stop14h 04m

Montreal Pierre Elliott Trudeau Intl

Mon 12/14

12:08 pm-12:02 am

1 stop12h 54m

$529

St. LouisMontreal

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

STLYUL

Lambert-St Louis

Mon 11/23

8:30 am-7:05 pm

1 stop9h 35m

Montreal Pierre Elliott Trudeau Intl

Fri 11/27

6:00 am-6:09 pm

1 stop13h 09m

$652

St. LouisMontreal

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

STLYUL

Lambert-St Louis

Wed 12/23

7:18 am-7:07 pm

1 stop10h 49m

Montreal Pierre Elliott Trudeau Intl

Tue 12/29

1:10 pm-9:22 pm

1 stop9h 12m

$652

St. LouisMontreal

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

STLYUL

Lambert-St Louis

Wed 12/9

9:32 am-6:54 pm

1 stop8h 22m

Montreal Pierre Elliott Trudeau Intl

Fri 12/11

7:44 pm-12:01 pm

1 stop17h 17m

$660

St. LouisMontreal

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

STLYUL

Lambert-St Louis

Wed 12/9

6:32 am-6:54 pm

2 stops11h 22m

Montreal Pierre Elliott Trudeau Intl

Fri 12/11

7:44 pm-12:01 pm

1 stop17h 17m

$670

St. LouisMontreal

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

STLYUL

Lambert-St Louis

Wed 12/9

6:32 am-6:54 pm

2 stops11h 22m

Montreal Pierre Elliott Trudeau Intl

Fri 12/11

7:44 pm-3:53 pm

2 stops21h 09m

$675

Quickest round-trip

St. LouisMontreal

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

STLYUL

Lambert-St Louis

Sun 11/22

8:30 am-7:02 pm

1 stop9h 32m

Montreal Pierre Elliott Trudeau Intl

Fri 11/27

6:00 am-2:34 pm

1 stop9h 34m

$738

St. LouisMontreal

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

STLYUL

Lambert-St Louis

Thu 11/19

9:40 am-9:25 am

3 stops22h 45m

Montreal Pierre Elliott Trudeau Intl

Sat 11/21

3:00 pm-3:26 pm

3 stops25h 26m

$1,609

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from St. Louis to Montreal

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

Prices

Airlines

Layovers

What is the cheapest month to fly to Montreal?

The cheapest month to fly to Montreal from St. Louis is in August. Flight prices, which tend to average around $457, are often lower during this time because this is during the off-season. If you are unable to visit Montreal during the month of August, then departing from St. Louis during the month February is also very affordable. Most momondo users find prices during this month for around $506.

What is the cheapest day to depart on your flight to Montreal?

The cheapest day to depart from St. Louis to Montreal is on a Tuesday when prices can be found for as low as $935. Flights from St. Louis to Montreal 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?

Our most recent data shows that the best time of day to fly to Montreal is in the morning. Flights from St. Louis to Montreal during this time can be as low as $994. At noon is when there is more demand to fly to Montreal, so prices are often more expensive at around $1,167 per ticket.

What is the cheapest Lambert-St Louis to Montreal flight route?

Fly from Lambert-St Louis to Montreal Pierre Elliott Trudeau Intl for the best Lambert-St Louis - Montreal flight prices

What cabin class options are available on St. Louis to Montreal flights?

There are 4 cabin classes available to choose from on St. Louis to Montreal 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 flights?

You could potentially save up to 17% on your flight if you consider stops on a St. Louis to Montreal flight.

When to book flights from St. Louis to Montreal

Are you open to changing your travel dates? Check out the ideal times to fly from St. Louis to Montreal according to our flight data. Find out which month and days have the cheapest flights.

Estimated round-trip price

Cheap St. Louis to Montreal (STL to YMQ) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to Montreal

Best Price Found	$236
Fastest flight time	2h 28m
Direct flights	None

The best one-way flight to Montreal from St. Louis in the past 72 hours is $236. The best round-trip flight deal from St. Louis to Montreal found on momondo in the last 72 hours is $497.

The fastest flight from St. Louis to Montreal takes 2h 28m

There are no direct flights from St. Louis to Montreal. Popular non-direct route for this connection is Lambert-St Louis Airport - Montreal Pierre Elliott Trudeau Intl Airport.

Search flight deals

Frequently asked questions about flying from St. Louis to Montreal

How far is Lambert-St Louis to Montreal by plane?
The distance between Lambert-St Louis and Montreal is about 973.0 mi. A reasonable flight in good conditions will take 2h 28m.
When did momondo last update prices for flights from Lambert-St Louis Airport to Montreal?
Prices for flights from Lambert-St Louis Airport to Montreal are updated daily.
How many operators does momondo search for flights from Lambert-St Louis Airport to Montreal?
As of November 2026, there are 3 operators available to choose from for flights from Lambert-St Louis Airport to Montreal.
How old do you have to be to fly from Lambert-St Louis Airport to Montreal?
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.
What documentation or ID do you need to fly to Montreal?
The required travel and health documents for your Montreal 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. 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?
Based on momondo bookings for this flight route, the most popular plane model on flight routes from St. Louis to Montreal is Canadair (Bombardier) Regional Jet 900 (54.90% of total bookings). The next most popular plane models are Boeing 787-8 Dreamliner (21.57%), Embraer 175 (11.76%), and Airbus A330-300 (5.88%).
What is the most popular airline from St. Louis to Montreal?
Based on momondo bookings for flights between St. Louis and Montreal, the leading airline is Air Canada, making up 70% of the total bookings. Other popular airlines include United Airlines with 15% and Delta with 14%.

Best airlines flying from St. Louis to Montreal

Compare and see reviews for airlines that fly from St. Louis to Montreal with momondo

Airline	Rating	Free Cancellation	Price
Air Canada	PriceFrom $257	Free Cancellation	Rating 7.1 11,847 reviews	Search Air Canada flights
Delta	PriceFrom $288	Free Cancellation	Rating 7.8 8,696 reviews	Search Delta flights
United Airlines	PriceFrom $296	Free Cancellation	Rating 7.3 10,460 reviews	Search United Airlines flights

Why use momondo?

Why should I use momondo to find a flight deal from St. Louis to Montreal?

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from St. Louis to Montreal for you.

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 can track prices for St. Louis to Montreal flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

An easier way to manage your Montreal trip

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Complete your trip

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Fly into one of these airports located in Montreal

MET - Montreal Metropolitan Airport

Montreal Pierre Elliott Trudeau Intl Airport

Cheap flights from St. Louis to Montreal from $236

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 12/21. 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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Delta flights from St. Louis to Montreal

Our best Delta deals on St. Louis to Montreal flight tickets

American Airlines flights from St. Louis to Montreal

Our best American Airlines deals on St. Louis to Montreal flight tickets

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See travel insights to Montreal from

How to get the cheapest flight ticket from St. Louis to Montreal

What is the cheapest month to fly to Montreal?

What is the cheapest day to depart on your flight to Montreal?

What is the cheapest time of day to depart on your flight to Montreal?

What is the cheapest Lambert-St Louis to Montreal flight route?

What cabin class options are available on St. Louis to Montreal flights?

Can stopping save me money on St. Louis to Montreal flights?

What is the cheapest airline that flies from Lambert-St Louis to Montreal?

What airlines fly to Montreal?

Which airport is the most popular layover for flights between St. Louis and Montreal?

Which layover airport offers the lowest fares from St. Louis to Montreal?

Which layover airport has the shortest travel time from St. Louis to Montreal?

Which layover airport has the shortest connection time from St. Louis to Montreal?

When to book flights from St. Louis to Montreal

Cheap St. Louis to Montreal (STL to YMQ) flight deals and tips

Best Price Found

Fastest flight time

Direct flights

Frequently asked questions about flying from St. Louis to Montreal

Best airlines flying from St. Louis to Montreal

Compare and see reviews for airlines that fly from St. Louis to Montreal with momondo

Why use momondo?

An easier way to manage your Montreal trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to Canada

Fly into one of these airports located in Montreal

Airports listed have a maximum distance of 9.4 mi from Montreal

Fly your favorite airline to Montreal

Airlines are sorted and displayed according to clicks in the past 7 days on momondo

Cabin classes currently available on flights to Montreal

List of cabin classes available on flights landing in Montreal. Availability may vary depending on flight origin and airline.

Popular cities in Canada

Popular flights according to clicks in the last 7 days on momondo

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According to popular flight searches on momondo this year

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