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

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

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

Detroit (DTW) has the shortest average layover time for this route: 0h 54m.

What airlines fly to Montreal?

Air Canada, American 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 39% of people opting to fly with this airline when traveling to Montreal. Keep in mind that there are 4 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 Chicago (ORD) offer the lowest average round-trip price of $341.

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 19m.

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.

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 March 2026, there are 4 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.

$129 Cheap Flights from St. Louis to Montreal in 2026

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Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

Enter your travel dates to find the best prices.

4:59 pm - 12:30 am

STL

YUL

30h 31m

1 stop

8:00 am - 6:50 am

YUL

STL

47h 50m

2 stops

$366Multiple Airlines

Mon, Apr 20 - Mon, Apr 27

8:03 pm - 11:44 am

STL

YUL

14h 41m

1 stop

12:30 pm - 8:09 pm

YUL

STL

8h 39m

1 stop

$373American Airlines

Wed, Apr 8 - Sat, Apr 11

4:59 pm - 12:30 am

STL

YUL

30h 31m

1 stop

8:00 am - 6:50 am

YUL

STL

47h 50m

2 stops

$374Multiple Airlines

Mon, Apr 20 - Mon, Apr 27

4:59 pm - 12:30 am

STL

YUL

30h 31m

1 stop

8:00 am - 6:50 am

YUL

STL

47h 50m

2 stops

$378Multiple Airlines

Mon, Apr 20 - Mon, Apr 27

8:03 pm - 11:44 am

STL

YUL

14h 41m

1 stop

1:03 pm - 11:46 pm

YUL

STL

11h 43m

2 stops

$383American Airlines

Wed, Apr 8 - Sat, Apr 11

8:03 pm - 11:44 am

STL

YUL

14h 41m

1 stop

12:30 pm - 10:19 pm

YUL

STL

10h 49m

1 stop

$387American Airlines

Mon, May 11 - Sat, May 16

8:54 am - 9:37 pm

STL

YUL

11h 43m

2 stops

1:03 pm - 11:46 pm

YUL

STL

11h 43m

2 stops

$388American Airlines

Wed, Apr 8 - Sat, Apr 11

8:03 pm - 11:44 am

STL

YUL

14h 41m

1 stop

1:03 pm - 11:56 pm

YUL

STL

11h 53m

2 stops

$397American Airlines

Mon, May 11 - Sat, May 16

5:21 pm - 11:44 am

STL

YUL

17h 23m

1 stop

12:30 pm - 11:46 pm

YUL

STL

12h 16m

1 stop

$401American Airlines

Mon, Apr 20 - Mon, Apr 27

2:33 pm - 11:44 am

STL

YUL

20h 11m

1 stop

12:30 pm - 10:17 pm

YUL

STL

10h 47m

1 stop

$406American Airlines

Mon, Apr 20 - Mon, Apr 27

Delta flights from St. Louis to Montreal

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

Delta

Mar 12

STL6:10 amLambert-St Louis

6h 27m

1 stop

YUL1:37 pmMontreal Pierre Elliott Trudeau Intl

Mar 21

YUL6:00 amMontreal Pierre Elliott Trudeau Intl

4h 46m

1 stop

STL9:46 amLambert-St Louis

$799

Delta

Mar 12

STL6:10 amLambert-St Louis

6h 27m

1 stop

YUL1:37 pmMontreal Pierre Elliott Trudeau Intl

Mar 20

YUL2:29 pmMontreal Pierre Elliott Trudeau Intl

7h 14m

1 stop

STL8:43 pmLambert-St Louis

$1,067

Delta

Mar 15

STL1:34 pmLambert-St Louis

10h 04m

2 stops

YUL12:38 amMontreal Pierre Elliott Trudeau Intl

Mar 28

YUL9:20 amMontreal Pierre Elliott Trudeau Intl

12h 46m

2 stops

STL9:06 pmLambert-St Louis

$1,584

United Airlines flights from St. Louis to Montreal

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

United Airlines

Mar 30

STL8:21 amLambert-St Louis

8h 09m

1 stop

YUL5:30 pmMontreal Pierre Elliott Trudeau Intl

Mar 31

YUL9:45 amMontreal Pierre Elliott Trudeau Intl

12h 23m

1 stop

STL9:08 pmLambert-St Louis

$467

United Airlines

Mar 30

STL6:30 amLambert-St Louis

10h 28m

2 stops

YUL5:58 pmMontreal Pierre Elliott Trudeau Intl

Mar 31

YUL1:20 pmMontreal Pierre Elliott Trudeau Intl

9h 27m

1 stop

STL9:47 pmLambert-St Louis

$477

United Airlines

Apr 21

STL7:45 amLambert-St Louis

10h 11m

1 stop

YUL6:56 pmMontreal Pierre Elliott Trudeau Intl

Apr 25

YUL1:20 pmMontreal Pierre Elliott Trudeau Intl

8h 53m

1 stop

STL9:13 pmLambert-St Louis

$501

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 4/20

4:59 pm-12:30 am

1 stop30h 31m

Montreal Pierre Elliott Trudeau Intl

Mon 4/27

8:00 am-6:50 am

2 stops47h 50m

$366

Quickest round-trip

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Wed 4/8

8:03 pm-11:44 am

1 stop14h 41m

Montreal Pierre Elliott Trudeau Intl

Sat 4/11

12:30 pm-8:09 pm

1 stop8h 39m

$373

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 4/20

4:59 pm-12:30 am

1 stop30h 31m

Montreal Pierre Elliott Trudeau Intl

Mon 4/27

8:00 am-6:50 am

2 stops47h 50m

$374

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 4/20

4:59 pm-12:30 am

1 stop30h 31m

Montreal Pierre Elliott Trudeau Intl

Mon 4/27

8:00 am-6:50 am

2 stops47h 50m

$378

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Wed 4/8

8:03 pm-11:44 am

1 stop14h 41m

Montreal Pierre Elliott Trudeau Intl

Sat 4/11

1:03 pm-11:46 pm

2 stops11h 43m

$383

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 5/11

8:03 pm-11:44 am

1 stop14h 41m

Montreal Pierre Elliott Trudeau Intl

Sat 5/16

12:30 pm-10:19 pm

1 stop10h 49m

$387

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Wed 4/8

8:54 am-9:37 pm

2 stops11h 43m

Montreal Pierre Elliott Trudeau Intl

Sat 4/11

1:03 pm-11:46 pm

2 stops11h 43m

$388

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 5/11

8:03 pm-11:44 am

1 stop14h 41m

Montreal Pierre Elliott Trudeau Intl

Sat 5/16

1:03 pm-11:56 pm

2 stops11h 53m

$397

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 4/20

5:21 pm-11:44 am

1 stop17h 23m

Montreal Pierre Elliott Trudeau Intl

Mon 4/27

12:30 pm-11:46 pm

1 stop12h 16m

$401

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 4/20

2:33 pm-11:44 am

1 stop20h 11m

Montreal Pierre Elliott Trudeau Intl

Mon 4/27

12:30 pm-10:17 pm

1 stop10h 47m

$406

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 day to depart on your flight to Montreal?

The cheapest day to depart from St. Louis to Montreal is on a Monday when prices can be found for as low as $994. Flights from St. Louis to Montreal on a Friday will generally be more expensive and average around $1,168. 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 $996. At noon is when there is more demand to fly to Montreal, so prices are often more expensive at around $1,061 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 Lambert-St Louis to Montreal flights?

There are 3 cabin classes available to choose from on Lambert-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 18% 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	$383
Fastest flight time	2h 31m
Direct flights	Mon, Tue, Thu, Fri, Sat and Sun
Airports in Montreal	2 airports

The best one-way flight to Montreal from St. Louis in the past 72 hours is $383. The best round-trip flight deal from St. Louis to Montreal found on momondo in the last 72 hours is $857.

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

Direct flights go from St. Louis to Montreal on Monday, Tuesday, Thursday, Friday, Saturday and Sunday. There are no airlines offering direct flights.

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

Search flight deals

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 March 2026, there are 4 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 (21.88% of total bookings). The next most popular plane models are Airbus A220-300 (18.75%), Canadair (Bombardier) Regional Jet 900 (12.50%), and Airbus A330-300 (9.38%).
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 47% of the total bookings. Other popular airlines include United Airlines with 23%, American 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
Delta	PriceFrom $212	Free Cancellation	Rating 7.9 8,271 reviews	Search Delta flights
United Airlines	PriceFrom $239	Free Cancellation	Rating 7.4 9,408 reviews	Search United Airlines flights
Air Canada	PriceFrom $318	Free Cancellation	Rating 7.1 10,799 reviews	Search Air Canada flights
American Airlines	PriceFrom $348	Free Cancellation	Rating 7.1 11,403 reviews	Search American 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.

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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 $129

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 3/31. 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

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How to get the cheapest flight ticket from St. Louis 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 Lambert-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

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

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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