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

1 flights are operational daily from Montreal to St. Louis as of July 2025. The most popular departure time for this route is 7:00p.m., with 100% of flights per day taking off in the evening.

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

As of July 2025, there are 11 flights per week flying from Montreal to St. Louis. The most common day of the week flights depart is Mon, with 18% of flights taking off on this day.

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

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

Which airlines fly to St. Louis?

Air Canada, WestJet and United Airlines are the top three most popular airlines that fly to St. Louis from Montreal according to our data. Air Canada is the first choice among our users, with 53% of people opting to fly with this airline when travelling to St. Louis. Keep in mind that there are 3 different airlines that fly to St. Louis on a routine basis, so you have a few additional options to choose from.

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

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

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

There are 3 operators available for flights from Montreal to Lambert-St Louis Airport as of July 2025.

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

Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Montreal to Lambert-St Louis Airport.

What documentation or ID do you need to fly to Lambert-St Louis Airport?

The travel and health documents you'll need for your trip to Lambert-St Louis Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Lambert-St Louis Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

C$ 266 Cheap Flights from Montreal to St. Louis in 2025

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

Prices are currently low for flights on this route. Typical prices usually range from C$ 561 to C$ 670. The lowest price recently found on this route was C$ 450.

1 adult

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Find the cheapest flights from Montreal to St. Louis

Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

12:31 p.m. - 9:53 p.m.YUL-STL

10h 22m1 stop

2:01 p.m. - 11:46 a.m.STL-YUL

20h 45m1 stop

C$ 450American Airlines

Find Deal

Sat, 13 Sep - Sat, 20 Sep

10:34 a.m. - 9:53 p.m.YUL-STL

12h 19m2 stops

5:25 p.m. - 11:46 a.m.STL-YUL

17h 21m1 stop

C$ 462American Airlines

Find Deal

Sat, 13 Sep - Sat, 20 Sep

6:00 a.m. - 8:06 a.m.YUL-STL

27h 06m1 stop

6:40 a.m. - 12:00 p.m.STL-YUL

4h 20m1 stop

C$ 563Delta

Find Deal

Mon, 8 Sep - Tue, 16 Sep

6:10 p.m. - 7:57 p.m.YUL-STL

2h 47mdirect

9:15 a.m. - 4:20 p.m.STL-YUL

6h 05m1 stop

C$ 589Air Canada

Find Deal

Mon, 8 Sep - Tue, 16 Sep

6:15 a.m. - 3:44 p.m.YUL-STL

10h 29m1 stop

7:04 p.m. - 10:40 a.m.STL-YUL

14h 36m1 stop

C$ 614United Airlines

Find Deal

Wed, 27 Aug - Wed, 3 Sep

7:00 a.m. - 3:25 p.m.YUL-STL

9h 25m1 stop

5:28 p.m. - 10:06 a.m.STL-YUL

15h 38m1 stop

C$ 651Delta

Find Deal

Thu, 25 Sep - Mon, 29 Sep

6:15 a.m. - 3:44 p.m.YUL-STL

10h 29m1 stop

6:35 a.m. - 9:29 p.m.STL-YUL

13h 54m1 stop

C$ 655United Airlines

Find Deal

Thu, 21 Aug - Wed, 3 Sep

7:00 a.m. - 4:35 p.m.YUL-STL

10h 35m3 stops

1:00 p.m. - 3:20 p.m.STL-YUL

25h 20m3 stops

C$ 663

Find Deal

Fri, 12 Sep - Fri, 19 Sep

6:45 a.m. - 9:40 a.m.YUL-STL

27h 55m2 stops

5:40 p.m. - 2:20 p.m.STL-YUL

19h 40m1 stop

C$ 665

Find Deal

Wed, 13 Aug - Sun, 17 Aug

6:10 p.m. - 7:57 p.m.YUL-STL

2h 47mdirect

1:30 p.m. - 5:00 p.m.STL-YUL

2h 30mdirect

C$ 683Air Canada

Find Deal

Mon, 8 Sep - Tue, 16 Sep

United Airlines flights from Montreal to St. Louis

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

United Airlines

27 Aug

YUL6:15 a.m.Montreal Pierre Elliott Trudeau Intl

10h 29m

1 stop

STL3:44 p.m.Lambert-St Louis

3 Sep

STL7:04 p.m.Lambert-St Louis

14h 36m

1 stop

YUL10:40 a.m.Montreal Pierre Elliott Trudeau Intl

C$ 614

Find similar

United Airlines

21 Aug

YUL6:15 a.m.Montreal Pierre Elliott Trudeau Intl

10h 29m

1 stop

STL3:44 p.m.Lambert-St Louis

3 Sep

STL6:35 a.m.Lambert-St Louis

13h 54m

1 stop

YUL9:29 p.m.Montreal Pierre Elliott Trudeau Intl

C$ 655

Find similar

United Airlines

12 Sep

YUL7:10 p.m.Montreal Pierre Elliott Trudeau Intl

16h 30m

2 stops

STL10:40 a.m.Lambert-St Louis

19 Sep

STL7:04 p.m.Lambert-St Louis

17h 50m

1 stop

YUL1:54 p.m.Montreal Pierre Elliott Trudeau Intl

C$ 657

Find similar

Air Canada flights from Montreal to St. Louis

Our best Air Canada deals on Montreal to St. Louis flight tickets

Air Canada

8 Sep

YUL6:10 p.m.Montreal Pierre Elliott Trudeau Intl

2h 47m

STL7:57 p.m.Lambert-St Louis

16 Sep

STL9:15 a.m.Lambert-St Louis

6h 05m

1 stop

YUL4:20 p.m.Montreal Pierre Elliott Trudeau Intl

C$ 589

Find similar

Air Canada

8 Sep

YUL6:10 p.m.Montreal Pierre Elliott Trudeau Intl

2h 47m

STL7:57 p.m.Lambert-St Louis

16 Sep

STL1:30 p.m.Lambert-St Louis

2h 30m

YUL5:00 p.m.Montreal Pierre Elliott Trudeau Intl

C$ 683

Find similar

Air Canada

25 Sep

YUL6:10 p.m.Montreal Pierre Elliott Trudeau Intl

2h 47m

STL7:57 p.m.Lambert-St Louis

29 Sep

STL1:30 p.m.Lambert-St Louis

2h 30m

YUL5:00 p.m.Montreal Pierre Elliott Trudeau Intl

C$ 716

Find similar

Fly from

Fly to

Route

Depart

Return

Price

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Sat 13/9

12:31 p.m.-9:53 p.m.

1 stop10h 22m

Lambert-St Louis

Sat 20/9

2:01 p.m.-11:46 a.m.

1 stop20h 45m

C$ 450

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Sat 13/9

10:34 a.m.-9:53 p.m.

2 stops12h 19m

Lambert-St Louis

Sat 20/9

5:25 p.m.-11:46 a.m.

1 stop17h 21m

C$ 462

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Mon 8/9

6:00 a.m.-8:06 a.m.

1 stop27h 06m

Lambert-St Louis

Tue 16/9

6:40 a.m.-12:00 p.m.

1 stop4h 20m

C$ 563

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Mon 8/9

6:10 p.m.-7:57 p.m.

Nonstop2h 47m

Lambert-St Louis

Tue 16/9

9:15 a.m.-4:20 p.m.

1 stop6h 05m

C$ 589

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Wed 27/8

6:15 a.m.-3:44 p.m.

1 stop10h 29m

Lambert-St Louis

Wed 3/9

7:04 p.m.-10:40 a.m.

1 stop14h 36m

C$ 614

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 25/9

7:00 a.m.-3:25 p.m.

1 stop9h 25m

Lambert-St Louis

Mon 29/9

5:28 p.m.-10:06 a.m.

1 stop15h 38m

C$ 651

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 21/8

6:15 a.m.-3:44 p.m.

1 stop10h 29m

Lambert-St Louis

Wed 3/9

6:35 a.m.-9:29 p.m.

1 stop13h 54m

C$ 655

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 12/9

7:00 a.m.-4:35 p.m.

3 stops10h 35m

Lambert-St Louis

Fri 19/9

1:00 p.m.-3:20 p.m.

3 stops25h 20m

C$ 663

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Wed 13/8

6:45 a.m.-9:40 a.m.

2 stops27h 55m

Lambert-St Louis

Sun 17/8

5:40 p.m.-2:20 p.m.

1 stop19h 40m

C$ 665

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Mon 8/9

6:10 p.m.-7:57 p.m.

Nonstop2h 47m

Lambert-St Louis

Tue 16/9

1:30 p.m.-5:00 p.m.

Nonstop2h 30m

C$ 683

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 Montreal to St. Louis

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

Other information

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

What is the cheapest month to fly to St. Louis?

The month of July is, on average, the cheapest month to fly to St. Louis from Montreal, with most prices found around C$ 394. If you don’t want to visit St. Louis in July, then you should wait until August to fly from Montreal, when ticket prices are also cheap, with an average price of C$ 622.

What is the cheapest day to depart on your flight to St. Louis?

Our data shows that Friday is the least expensive day to fly to St. Louis. Tickets to fly out on this day can be as low as C$ 618. The most expensive day to fly to St. Louis is Monday, with ticket prices averaging around C$ 1,048.

What is the cheapest time of day to depart on your flight to St. Louis?

The cheapest time of day to fly to St. Louis is in the morning when flights can be purchased for as low as C$ 699. If you have a flexible travel schedule, then try to avoid flying in the evening when prices are C$ 897 on average. Flights to St. Louis from Montreal in the evening are generally more expensive because this time of day is more convenient for travellers’ schedules.

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

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

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

There are 1 cabin classes available to choose from on Montreal to Lambert-St Louis 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 Montreal to St. Louis flights?

You could potentially save up to 22% on your flight if you consider stops on a Montreal to St. Louis flight.

When to book flights from Montreal to St. Louis

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

Estimated round-trip price

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

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

Best price found	C$ 266
Fastest flight time	2h 47m
Direct flights	Every day
Airports in St. Louis	1 airport

The best one-way flight to St. Louis from Montreal in the past 72 hours is C$ 266. The best round-trip flight deal from Montreal to St. Louis found on momondo in the last 72 hours is C$ 450.

The fastest flight from Montreal to St. Louis takes 2h 47m

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

There is 1 airport near St. Louis: Lambert-St Louis (STL)

Search flight deals

How far is Montreal to Lambert-St Louis by plane?
The straight-line distance from Montreal to Lambert-St Louis is 1566.0 km. Flights usually cover this in 2h 47m, depending on flying conditions and air traffic around both airports.
When did momondo last update prices for flights from Montreal to Lambert-St Louis Airport?
Prices for flights from Montreal to Lambert-St Louis Airport are updated daily.
How many operators does momondo search for flights from Montreal to Lambert-St Louis Airport?
There are 3 operators available for flights from Montreal to Lambert-St Louis Airport as of July 2025.
How old do you have to be to fly from Montreal to Lambert-St Louis Airport?
Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Montreal to Lambert-St Louis Airport.
What documentation or ID do you need to fly to Lambert-St Louis Airport?
The travel and health documents you'll need for your trip to Lambert-St Louis Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Lambert-St Louis Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.
What is the most popular plane model from Montreal to St. Louis?
Based on momondo bookings for this flight route, the most popular plane model on flight routes from Montreal to St. Louis is Canadair (Bombardier) Regional Jet 900 (68.57% of total bookings). The next most popular plane model is Airbus A220-300 (31.43%).
What is the most popular airline from Montreal to St. Louis?
Based on momondo bookings for flights between Montreal and St. Louis, the leading airline is Air Canada, making up 100% of the total bookings.

Best airlines flying from Montreal to St. Louis

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

Airline	Rating	Free Cancellation	Price
Air Canada	PriceFrom C$ 541	Free Cancellation	Rating 7.1 9,851 reviews	Search Air Canada flights
United Airlines	PriceFrom C$ 592	Free Cancellation	Rating 7.4 8,900 reviews	Search United Airlines flights
WestJet	PriceFrom C$ 739	Free Cancellation	Rating 7.2 2,978 reviews	Search WestJet flights

United Airlines Flights From Montreal to St. Louis
Across 7 United Airlines flights from Montreal to St. Louis this week, the average price was C$ 540, with the best United Airlines deals starting from C$ 429 round-trip. 8,900 users have rated United Airlines on momondo, with an average score of 7.4/10.
Air Canada Flights From Montreal to St. Louis
Another popular option for Montreal to St. Louis flights is Air Canada (7.1/10, 9,851 ratings). Air Canada flies from Montreal to St. Louis around 4 times per week, with deals starting from C$ 392 round-trip and rising to an average price of around C$ 539.

Edwardsville

Chesterfield

Collinsville

Litchfield

Why use momondo?

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

It is quick and easy to find Montreal to St. Louis flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to St. Louis that suits you.

Can I find flights from Montreal to St. Louis with flexible booking policies on momondo?

Yes. All flights to St. Louis from Montreal on momondo can be compared and filtered by various policies on offer, including flexible booking.

How can momondo help me find flights from Montreal to St. Louis?

Once all potential Montreal to St. Louis 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 Montreal to St. Louis right now. Can momondo alert me if prices change?

If you are simply researching potential flights to St. Louis, momondo offers a useful price alert feature which will track prices for flights to St. Louis from Montreal and alert you when they change.

An easier way to manage your St. Louis trip

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Cheap flights from Montreal to St. Louis from C$ 266

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Montreal to St. Louis departing on 19/9. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

Big names, great deals

Big names, great deals

Filter for what you want

Filter for what you want

Trusted and free

Trusted and free

Price Alerts

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Find the cheapest flights from Montreal to St. Louis

Cheap round-trip flights

Cheap one-way flights

Cheap last-minute flights

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United Airlines flights from Montreal to St. Louis

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

Air Canada flights from Montreal to St. Louis

Our best Air Canada deals on Montreal to St. Louis flight tickets

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Use the filters below to find and compare flights from Montreal to St. Louis that are best for you.

See travel insights to St. Louis from

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

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 Montreal and St. Louis?

What is the cheapest month to fly to St. Louis?

The month of July is, on average, the cheapest month to fly to St. Louis from Montreal, with most prices found around C$ 394. If you don’t want to visit St. Louis in July, then you should wait until August to fly from Montreal, when ticket prices are also cheap, with an average price of C$ 622.

What is the cheapest day to depart on your flight to St. Louis?

Our data shows that Friday is the least expensive day to fly to St. Louis. Tickets to fly out on this day can be as low as C$ 618. The most expensive day to fly to St. Louis is Monday, with ticket prices averaging around C$ 1,048.

What is the cheapest time of day to depart on your flight to St. Louis?

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

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

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

There are 1 cabin classes available to choose from on Montreal to Lambert-St Louis 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 Montreal to St. Louis flights?

You could potentially save up to 22% on your flight if you consider stops on a Montreal to St. Louis flight.

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

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

Which airlines fly to St. Louis?

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

1 flights are operational daily from Montreal to St. Louis as of July 2025. The most popular departure time for this route is 7:00p.m., with 100% of flights per day taking off in the evening.

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

As of July 2025, there are 11 flights per week flying from Montreal to St. Louis. The most common day of the week flights depart is Mon, with 18% of flights taking off on this day.

When to book flights from Montreal to St. Louis

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

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

Best price found

Fastest flight time

Direct flights

Airports in St. Louis

How far is Montreal to Lambert-St Louis by plane?

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

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

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

What documentation or ID do you need to fly to Lambert-St Louis Airport?

What is the most popular plane model from Montreal to St. Louis?

What is the most popular airline from Montreal to St. Louis?

Best airlines flying from Montreal to St. Louis

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

United Airlines Flights From Montreal to St. Louis

Air Canada Flights From Montreal to St. Louis

Travelling to a place near St. Louis?

Why use momondo?

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

Can I find flights from Montreal to St. Louis with flexible booking policies on momondo?

How can momondo help me find flights from Montreal to St. Louis?

I’m not ready to book a flight from Montreal to St. Louis right now. Can momondo alert me if prices change?

An easier way to manage your St. Louis 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 the United States

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