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 25m.

How many flights depart from St. Louis to Montreal on average per week?

As of August 2026, 14 flights take off from St. Louis and land in Montreal each week. The most common flight departure day for this route is Mon, with 14% of weekly flights taking off on this day.

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

Detroit (DTW) was the most common stop: 50% of momondo users choosing 1-stop flights on this route connected there.

How many flights depart from St. Louis to Montreal on average per day?

As of August 2026, 2 flights take off from St. Louis and land in Montreal each day. The most common flight departure time for this route is 12:00PM, with 100% of daily flights taking off in the afternoon.

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 02m.

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 August 2026, there are 2 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.

$201 Cheap Flights from St. Louis to Montreal in 2026

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from St. Louis to Montreal

Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

Enter your travel dates to find the best prices.

7:29 am - 4:52 pm-

8h 23m

12:30 pm - 11:58 pm-

12h 28m

$483American Airlines

Sat, Oct 24 - Tue, Oct 27

5:18 pm - 11:44 am-

17h 26m

12:31 pm - 12:27 am-

12h 56m

$486American Airlines

Wed, Sep 16 - Wed, Sep 23

7:27 am - 4:53 pm-

8h 26m

12:31 pm - 12:27 am-

12h 56m

$488American Airlines

Thu, Sep 17 - Thu, Sep 24

5:00 am - 4:53 pm-

10h 53m

12:31 pm - 12:27 am-

12h 56m

$494American Airlines

Thu, Sep 17 - Mon, Sep 21

9:40 am - 9:01 pm-

10h 21m

6:10 am - 2:30 pm-

9h 20m

$603United Airlines

Sat, Jan 9 - Wed, Jan 13

9:40 am - 9:01 pm-

10h 21m

6:10 am - 2:30 pm-

9h 20m

$637United Airlines

Sat, Jan 9 - Wed, Jan 13

6:50 pm - 10:17 am-

14h 27m

9:25 am - 7:23 pm-

10h 58m

$637United Airlines

Tue, Oct 27 - Sat, Oct 31

12:10 pm - 3:41 pm-

2h 31mnonstop

4:55 pm - 6:41 pm-

2h 46mnonstop

$643Air Canada

Wed, Sep 30 - Mon, Oct 5

12:10 pm - 3:41 pm-

2h 31mnonstop

4:55 pm - 6:41 pm-

2h 46mnonstop

$643Air Canada

Wed, Sep 16 - Wed, Sep 23

4:05 pm - 11:25 pm-

6h 20m

8:30 am - 3:26 pm-

7h 56m

$648Air Canada

Mon, Nov 2 - Tue, Nov 3

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Delta flights from St. Louis to Montreal

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

Delta

Oct 27

STL5:31 pmLambert-St Louis

14h 01m

1 stop

YUL8:32 amMontreal Pierre Elliott Trudeau Intl

Nov 6

YUL7:46 pmMontreal Pierre Elliott Trudeau Intl

22h 13m

1 stop

STL4:59 pmLambert-St Louis

$616

Delta

Oct 28

STL6:00 amLambert-St Louis

11h 58m

2 stops

YUL6:58 pmMontreal Pierre Elliott Trudeau Intl

Nov 3

YUL7:50 pmMontreal Pierre Elliott Trudeau Intl

16h 57m

1 stop

STL11:47 amLambert-St Louis

$625

Delta

Aug 8

STL2:00 pmLambert-St Louis

17h 39m

1 stop

YUL8:39 amMontreal Pierre Elliott Trudeau Intl

Aug 10

YUL7:44 pmMontreal Pierre Elliott Trudeau Intl

13h 24m

1 stop

STL8:08 amLambert-St Louis

$1,048

United Airlines flights from St. Louis to Montreal

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

United Airlines

Jan 9

STL9:40 amLambert-St Louis

10h 21m

1 stop

YUL9:01 pmMontreal Pierre Elliott Trudeau Intl

Jan 13

YUL6:10 amMontreal Pierre Elliott Trudeau Intl

9h 20m

1 stop

STL2:30 pmLambert-St Louis

$603

United Airlines

Aug 10

STL12:10 pmLambert-St Louis

2h 32m

YUL3:42 pmMontreal Pierre Elliott Trudeau Intl

Aug 15

YUL6:10 amMontreal Pierre Elliott Trudeau Intl

5h 02m

1 stop

STL10:12 amLambert-St Louis

$1,080

United Airlines

Aug 7

STL3:22 pmLambert-St Louis

25h 08m

1 stop

YUL5:30 pmMontreal Pierre Elliott Trudeau Intl

Aug 10

YUL6:00 amMontreal Pierre Elliott Trudeau Intl

18h 44m

1 stop

STL11:44 pmLambert-St Louis

$1,124

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sat 10/24

7:29 am-4:52 pm

1 stop8h 23m

Montreal Pierre Elliott Trudeau Intl

Tue 10/27

12:30 pm-11:58 pm

1 stop12h 28m

$483

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Wed 9/16

5:18 pm-11:44 am

1 stop17h 26m

Montreal Pierre Elliott Trudeau Intl

Wed 9/23

12:31 pm-12:27 am

1 stop12h 56m

$486

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 9/17

7:27 am-4:53 pm

1 stop8h 26m

Montreal Pierre Elliott Trudeau Intl

Thu 9/24

12:31 pm-12:27 am

1 stop12h 56m

$488

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 9/17

5:00 am-4:53 pm

1 stop10h 53m

Montreal Pierre Elliott Trudeau Intl

Mon 9/21

12:31 pm-12:27 am

1 stop12h 56m

$494

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sat 1/9

9:40 am-9:01 pm

1 stop10h 21m

Montreal Pierre Elliott Trudeau Intl

Wed 1/13

6:10 am-2:30 pm

1 stop9h 20m

$603

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sat 1/9

9:40 am-9:01 pm

1 stop10h 21m

Montreal Pierre Elliott Trudeau Intl

Wed 1/13

6:10 am-2:30 pm

1 stop9h 20m

$637

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 10/27

6:50 pm-10:17 am

1 stop14h 27m

Montreal Pierre Elliott Trudeau Intl

Sat 10/31

9:25 am-7:23 pm

1 stop10h 58m

$637

Quickest round-trip

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Wed 9/30

12:10 pm-3:41 pm

Nonstop2h 31m

Montreal Pierre Elliott Trudeau Intl

Mon 10/5

4:55 pm-6:41 pm

Nonstop2h 46m

$643

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Wed 9/16

12:10 pm-3:41 pm

Nonstop2h 31m

Montreal Pierre Elliott Trudeau Intl

Wed 9/23

4:55 pm-6:41 pm

Nonstop2h 46m

$643

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 11/2

4:05 pm-11:25 pm

1 stop6h 20m

Montreal Pierre Elliott Trudeau Intl

Tue 11/3

8:30 am-3:26 pm

2 stops7h 56m

$648

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

Other information

What is the typical price of a round-trip flight between St. Louis and Montreal?

Prices are currently typical for flights on this route.

Typical prices usually range from $462 to $768.
The lowest price recently found on this route was $483.

What is the cheapest month to fly to Montreal?

The cheapest month to fly to Montreal from St. Louis is in February. Flight prices, which tend to average around $506, are often lower during this time because this is during the off-season. If you are unable to visit Montreal during the month of February, then departing from St. Louis during the month August is also very affordable. Most momondo users find prices during this month for around $569.

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 $953. Flights from St. Louis to Montreal on a Friday will generally be more expensive and average around $1,171. 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 $1,001. At noon is when there is more demand to fly to Montreal, so prices are often more expensive at around $1,052 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	$413
Fastest flight time	2h 31m
Direct flights	Every day
Airports in Montreal	2 airports

The best one-way flight to Montreal from St. Louis in the past 72 hours is $413. The best round-trip flight deal from St. Louis to Montreal found on momondo in the last 72 hours is $940.

The fastest flight from St. Louis to Montreal takes 2h 31m

Direct flights go from St. Louis to Montreal every day.

There are 2 airports in Montreal. From St. Louis there are direct flights to Montreal Pierre Elliott Trudeau Intl (YUL).

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 31m.
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 August 2026, there are 2 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 (38.46% of total bookings). The next most popular plane models are Boeing 787-8 Dreamliner (32.97%), Airbus A220-300 (17.58%), and Airbus A330-300 (3.30%).
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 64% of the total bookings. Other popular airlines include Delta with 19% and United Airlines with 17%.

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 11,426 reviews		Search Air Canada flights
United Airlines	PriceFrom $296	Free Cancellation	Rating 7.4 10,059 reviews		Search United Airlines flights

United Airlines Flights From St. Louis to Montreal
Across 7 United Airlines flights from St. Louis to Montreal this week, the average price was $754, with the best United Airlines deals starting from $296 round-trip. 10,059 users have rated United Airlines on momondo, with an average score of 7.4/10.
Air Canada Flights From St. Louis to Montreal
Air Canada (7.1/10 from 11,426 reviews) operates around 7 flights from St. Louis to Montreal in any given week. The average Air Canada airfare for this route is around $649, with deals from around $257 rare but found on momondo. Referenced prices are for round-trip St. Louis to Montreal flight searches in the last 72 hours.

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.

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Fly into one of these airports located in Montreal

Montreal St Hubert Airport

Montreal Pierre Elliott Trudeau Intl Airport

Cheap flights from St. Louis to Montreal from $201

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 9/15. 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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Delta flights from St. Louis to Montreal

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

United Airlines flights from St. Louis to Montreal

Our best United 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 typical price of a round-trip flight between St. Louis and 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?

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?

How many flights depart from St. Louis to Montreal on average per day?

How many flights depart from St. Louis to Montreal on average per week?

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

Airports in Montreal

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

Fly to other destinations from St. Louis

According to popular flight searches on momondo this year

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