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

Detroit (DTW) was the most common stop: 40% of momondo users choosing 1-stop flights on this route connected there.

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.

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.

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

United Airlines and American Airlines are the most popular carriers operating from Lambert-St Louis to Montreal

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

Flights via Chicago (ORD) offer the lowest average round-trip price of $341.

What airlines fly to Montreal?

Air Canada, American Airlines and United Airlines 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 50% 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.

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

As of June 2026, 6 flights take off from St. Louis and land in Montreal each week. The most common flight departure day for this route is Mon, with 33% of weekly flights taking off on this day.

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 June 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.

$189 Cheap Flights from St. Louis to Montreal in 2026

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

Prices are currently low for flights on this route. Typical prices usually range from $638 to $577. The lowest price recently found on this route was $427.

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.

8:05 pm - 11:20 am

STL

YUL

14h 15m

1 stop

12:30 pm - 8:08 pm

YUL

STL

8h 38m

1 stop

$427American Airlines

Tue, Oct 6 - Tue, Oct 13

8:06 pm - 11:43 am

STL

YUL

14h 37m

1 stop

5:34 pm - 10:20 am

YUL

STL

17h 46m

1 stop

$470American Airlines

Sat, Sep 5 - Tue, Sep 8

6:00 am - 4:53 pm

STL

YUL

9h 53m

1 stop

5:34 pm - 8:23 am

YUL

STL

15h 49m

1 stop

$483American Airlines

Tue, Aug 18 - Fri, Aug 21

5:00 am - 4:53 pm

STL

YUL

10h 53m

1 stop

5:34 pm - 10:20 am

YUL

STL

17h 46m

1 stop

$513American Airlines

Wed, Sep 16 - Wed, Sep 23

5:00 am - 4:54 pm

STL

YUL

10h 54m

1 stop

12:30 pm - 12:14 am

YUL

STL

12h 44m

1 stop

$524American Airlines

Sat, Aug 8 - Tue, Aug 18

5:06 pm - 6:15 pm

STL

YUL

24h 09m

2 stops

6:47 pm - 9:43 am

YUL

STL

15h 56m

1 stop

$526Multiple Airlines

Sat, Jul 4 - Mon, Jul 13

5:00 am - 4:53 pm

STL

YUL

10h 53m

1 stop

12:31 pm - 8:44 pm

YUL

STL

9h 13m

1 stop

$532American Airlines

Wed, Sep 16 - Wed, Sep 23

5:06 pm - 6:15 pm

STL

YUL

24h 09m

2 stops

6:47 pm - 11:53 pm

YUL

STL

6h 06m

1 stop

$533Multiple Airlines

Sat, Jul 4 - Mon, Jul 13

4:57 pm - 6:15 pm

STL

YUL

24h 18m

2 stops

6:47 pm - 11:53 pm

YUL

STL

6h 06m

1 stop

$540Multiple Airlines

Mon, Jul 13 - Wed, Jul 15

2:26 pm - 9:50 am

STL

YUL

18h 24m

1 stop

12:30 pm - 12:16 am

YUL

STL

12h 46m

1 stop

$547American Airlines

Tue, Jun 30 - Tue, Jul 7

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United Airlines flights from St. Louis to Montreal

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

United Airlines

Jul 8

STL7:20 amLambert-St Louis

9h 10m

1 stop

YUL5:30 pmMontreal Pierre Elliott Trudeau Intl

Jul 15

YUL6:10 amMontreal Pierre Elliott Trudeau Intl

16h 16m

1 stop

STL9:26 pmLambert-St Louis

$563

United Airlines

Sep 16

STL8:40 amLambert-St Louis

5h 00m

1 stop

YUL2:40 pmMontreal Pierre Elliott Trudeau Intl

Sep 23

YUL6:00 amMontreal Pierre Elliott Trudeau Intl

10h 38m

2 stops

STL3:38 pmLambert-St Louis

$642

United Airlines

Jun 29

STL9:15 amLambert-St Louis

7h 15m

1 stop

YUL5:30 pmMontreal Pierre Elliott Trudeau Intl

Jul 2

YUL6:00 amMontreal Pierre Elliott Trudeau Intl

10h 46m

2 stops

STL3:46 pmLambert-St Louis

$672

American Airlines flights from St. Louis to Montreal

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

American Airlines

Oct 6

STL8:05 pmLambert-St Louis

14h 15m

1 stop

YUL11:20 amMontreal Pierre Elliott Trudeau Intl

Oct 13

YUL12:30 pmMontreal Pierre Elliott Trudeau Intl

8h 38m

1 stop

STL8:08 pmLambert-St Louis

$427

American Airlines

Sep 5

STL8:06 pmLambert-St Louis

14h 37m

1 stop

YUL11:43 amMontreal Pierre Elliott Trudeau Intl

Sep 8

YUL5:34 pmMontreal Pierre Elliott Trudeau Intl

17h 46m

1 stop

STL10:20 amLambert-St Louis

$470

American Airlines

Aug 18

STL6:00 amLambert-St Louis

9h 53m

1 stop

YUL4:53 pmMontreal Pierre Elliott Trudeau Intl

Aug 21

YUL5:34 pmMontreal Pierre Elliott Trudeau Intl

15h 49m

1 stop

STL8:23 amLambert-St Louis

$483

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 10/6

8:05 pm-11:20 am

1 stop14h 15m

Montreal Pierre Elliott Trudeau Intl

Tue 10/13

12:30 pm-8:08 pm

1 stop8h 38m

$427

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sat 9/5

8:06 pm-11:43 am

1 stop14h 37m

Montreal Pierre Elliott Trudeau Intl

Tue 9/8

5:34 pm-10:20 am

1 stop17h 46m

$470

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-8:23 am

1 stop15h 49m

$483

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Wed 9/16

5:00 am-4:53 pm

1 stop10h 53m

Montreal Pierre Elliott Trudeau Intl

Wed 9/23

5:34 pm-10:20 am

1 stop17h 46m

$513

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sat 8/8

5:00 am-4:54 pm

1 stop10h 54m

Montreal Pierre Elliott Trudeau Intl

Tue 8/18

12:30 pm-12:14 am

1 stop12h 44m

$524

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sat 7/4

5:06 pm-6:15 pm

2 stops24h 09m

Montreal Pierre Elliott Trudeau Intl

Mon 7/13

6:47 pm-9:43 am

1 stop15h 56m

$526

Quickest round-trip

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Wed 9/16

5:00 am-4:53 pm

1 stop10h 53m

Montreal Pierre Elliott Trudeau Intl

Wed 9/23

12:31 pm-8:44 pm

1 stop9h 13m

$532

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sat 7/4

5:06 pm-6:15 pm

2 stops24h 09m

Montreal Pierre Elliott Trudeau Intl

Mon 7/13

6:47 pm-11:53 pm

1 stop6h 06m

$533

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 7/13

4:57 pm-6:15 pm

2 stops24h 18m

Montreal Pierre Elliott Trudeau Intl

Wed 7/15

6:47 pm-11:53 pm

1 stop6h 06m

$540

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 6/30

2:26 pm-9:50 am

1 stop18h 24m

Montreal Pierre Elliott Trudeau Intl

Tue 7/7

12:30 pm-12:16 am

1 stop12h 46m

$547

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?

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 $257, 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 September is also very affordable. Most momondo users find prices during this month for around $285.

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 Wednesday when prices can be found for as low as $877. Flights from St. Louis to Montreal 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?

Our most recent data shows that the best time of day to fly to Montreal is at noon. Flights from St. Louis to Montreal during this time can be as low as $984. In the morning is when there is more demand to fly to Montreal, so prices are often more expensive at around $1,008 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 3 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?

No. A direct flight is the cheapest option for a flight between St. Louis to Montreal.

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	$462
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 $462. The best round-trip flight deal from St. Louis to Montreal found on momondo in the last 72 hours is $975.

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 June 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 Boeing 787-8 Dreamliner (30.26% of total bookings). The next most popular plane models are Airbus A220-300 (28.95%), Canadair (Bombardier) Regional Jet 900 (21.05%), and Airbus A330-300 (3.95%).
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 63% of the total bookings. Other popular airlines include Delta with 20% and American 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 11,197 reviews	Search Air Canada flights
United Airlines	PriceFrom $296	Free Cancellation	Rating 7.4 9,842 reviews	Search United Airlines flights
American Airlines	PriceFrom $348	Free Cancellation	Rating 7.1 11,666 reviews	Search American Airlines flights

United Airlines Flights From St. Louis to Montreal
Across 3 United Airlines flights from St. Louis to Montreal this week, the average price was $759, with the best United Airlines deals starting from $296 round-trip. 9,842 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 11,197 reviews) operates around 3 flights from St. Louis to Montreal in any given week. The average Air Canada airfare for this route is around $624, 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.

An easier way to manage your Montreal trip

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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 $189

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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United Airlines flights from St. Louis to Montreal

Our best United Airlines 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 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?

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?

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

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

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

United Airlines Flights From St. Louis to Montreal

Air Canada Flights From St. Louis to Montreal

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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