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Cheap flights from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis from C$ 271

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 Pierre Elliott Trudeau Intl Airport to St. Louis departing on 29/4. 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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Find the cheapest flights from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis

Cheap round-trip flights

Enter your travel dates to find the best prices.
American Airlines Logo
12:30 p.m. - 11:46 p.m.
YUL
-
STL
12h 16m
1 stop
American Airlines Logo
5:21 p.m. - 11:44 a.m.
STL
-
YUL
17h 23m
1 stop
C$ 477American Airlines
Mon, 20 Apr - Sat, 25 Apr
Air Canada Logo
8:50 a.m. - 3:29 p.m.
YUL
-
STL
7h 39m
2 stops
Air Canada Logo
4:05 p.m. - 11:32 p.m.
STL
-
YUL
6h 27m
1 stop
C$ 613Air Canada
Fri, 13 Mar - Sun, 15 Mar
Air Canada Logo
9:10 a.m. - 3:29 p.m.
YUL
-
STL
7h 19m
1 stop
Air Canada Logo
4:05 p.m. - 11:32 p.m.
STL
-
YUL
6h 27m
1 stop
C$ 624Air Canada
Fri, 13 Mar - Sun, 15 Mar
Delta Logo
6:45 p.m. - 11:59 p.m.
YUL
-
STL
6h 14m
1 stop
Delta Logo
6:04 p.m. - 11:13 p.m.
STL
-
YUL
4h 09m
1 stop
C$ 645Delta
Sun, 10 May - Sat, 16 May
Delta Logo
6:00 a.m. - 1:05 p.m.
YUL
-
STL
8h 05m
1 stop
Delta Logo
5:47 p.m. - 11:41 p.m.
STL
-
YUL
4h 54m
1 stop
C$ 647Delta
Sun, 10 May - Sat, 16 May
Air Canada Logo
6:10 p.m. - 8:05 p.m.
YUL
-
STL
2h 55mdirect
Air Canada Logo
7:30 a.m. - 3:21 p.m.
STL
-
YUL
6h 51m
1 stop
C$ 650Air Canada
Sun, 10 May - Sat, 16 May
Air Canada Logo
6:10 p.m. - 8:05 p.m.
YUL
-
STL
2h 55mdirect
Air Canada Logo
7:30 a.m. - 3:21 p.m.
STL
-
YUL
6h 51m
1 stop
C$ 651Air Canada
Sun, 10 May - Sat, 16 May
Air Canada Logo
8:10 a.m. - 12:06 p.m.
YUL
-
STL
4h 56m
1 stop
Air Canada Logo
7:30 a.m. - 3:49 p.m.
STL
-
YUL
7h 19m
2 stops
C$ 660Air Canada
Sun, 10 May - Sat, 16 May
Air Canada Logo
8:10 a.m. - 12:06 p.m.
YUL
-
STL
4h 56m
1 stop
Air Canada Logo
7:30 a.m. - 3:49 p.m.
STL
-
YUL
7h 19m
2 stops
C$ 662Air Canada
Sun, 10 May - Sat, 16 May
Multiple Airlines Logo
7:33 p.m. - 6:51 a.m.
YUL
-
STL
36h 18m
2 stops
Multiple Airlines Logo
3:49 p.m. - 12:30 a.m.
STL
-
YUL
7h 41m
1 stop
C$ 706Multiple Airlines
Thu, 26 Feb - Tue, 3 Mar

American Airlines flights from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis

Our best American Airlines deals on Montreal Pierre Elliott Trudeau Intl Airport to St. Louis flight tickets
American Airlines
20 Apr
YUL12:30 p.m.Montreal Pierre Elliott Trudeau Intl
12h 16m
1 stop
STL11:46 p.m.Lambert-St Louis
25 Apr
STL5:21 p.m.Lambert-St Louis
17h 23m
1 stop
YUL11:44 a.m.Montreal Pierre Elliott Trudeau Intl
C$ 477
American Airlines
3 Apr
YUL2:25 p.m.Montreal Pierre Elliott Trudeau Intl
19h 10m
1 stop
STL8:35 a.m.Lambert-St Louis
11 Apr
STL8:03 p.m.Lambert-St Louis
14h 41m
1 stop
YUL11:44 a.m.Montreal Pierre Elliott Trudeau Intl
C$ 526
American Airlines
16 Feb
YUL3:45 p.m.Montreal Pierre Elliott Trudeau Intl
17h 56m
1 stop
STL8:41 a.m.Lambert-St Louis
17 Feb
STL11:59 a.m.Lambert-St Louis
9h 57m
2 stops
YUL10:56 p.m.Montreal Pierre Elliott Trudeau Intl
C$ 1,039

Air Canada flights from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis

Our best Air Canada deals on Montreal Pierre Elliott Trudeau Intl Airport to St. Louis flight tickets
Air Canada
13 Mar
YUL8:50 a.m.Montreal Pierre Elliott Trudeau Intl
7h 39m
2 stops
STL3:29 p.m.Lambert-St Louis
15 Mar
STL4:05 p.m.Lambert-St Louis
6h 27m
1 stop
YUL11:32 p.m.Montreal Pierre Elliott Trudeau Intl
C$ 613
Air Canada
13 Mar
YUL9:10 a.m.Montreal Pierre Elliott Trudeau Intl
7h 19m
1 stop
STL3:29 p.m.Lambert-St Louis
15 Mar
STL4:05 p.m.Lambert-St Louis
6h 27m
1 stop
YUL11:32 p.m.Montreal Pierre Elliott Trudeau Intl
C$ 624
Air Canada
10 May
YUL6:10 p.m.Montreal Pierre Elliott Trudeau Intl
2h 55m
STL8:05 p.m.Lambert-St Louis
16 May
STL7:30 a.m.Lambert-St Louis
6h 51m
1 stop
YUL3:21 p.m.Montreal Pierre Elliott Trudeau Intl
C$ 650

momondo Fare Finder

 
Customize your flight search to find flights from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 96,600 searches. Data last updated 7 February 2026.
Use the filters below to find and compare flights from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Mon 20/4

12:30 p.m.-11:46 p.m.

1 stop12h 16m

Lambert-St Louis

Sat 25/4

5:21 p.m.-11:44 a.m.

1 stop17h 23m

C$ 477

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 13/3

8:50 a.m.-3:29 p.m.

2 stops7h 39m

Lambert-St Louis

Sun 15/3

4:05 p.m.-11:32 p.m.

1 stop6h 27m

C$ 613

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 13/3

9:10 a.m.-3:29 p.m.

1 stop7h 19m

Lambert-St Louis

Sun 15/3

4:05 p.m.-11:32 p.m.

1 stop6h 27m

C$ 624

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Sun 10/5

6:45 p.m.-11:59 p.m.

1 stop6h 14m

Lambert-St Louis

Sat 16/5

6:04 p.m.-11:13 p.m.

1 stop4h 09m

C$ 645

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Sun 10/5

6:00 a.m.-1:05 p.m.

1 stop8h 05m

Lambert-St Louis

Sat 16/5

5:47 p.m.-11:41 p.m.

1 stop4h 54m

C$ 647

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Sun 10/5

6:10 p.m.-8:05 p.m.

Nonstop2h 55m

Lambert-St Louis

Sat 16/5

7:30 a.m.-3:21 p.m.

1 stop6h 51m

C$ 650

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Sun 10/5

6:10 p.m.-8:05 p.m.

Nonstop2h 55m

Lambert-St Louis

Sat 16/5

7:30 a.m.-3:21 p.m.

1 stop6h 51m

C$ 651

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Sun 10/5

8:10 a.m.-12:06 p.m.

1 stop4h 56m

Lambert-St Louis

Sat 16/5

7:30 a.m.-3:49 p.m.

2 stops7h 19m

C$ 660

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Sun 10/5

8:10 a.m.-12:06 p.m.

1 stop4h 56m

Lambert-St Louis

Sat 16/5

7:30 a.m.-3:49 p.m.

2 stops7h 19m

C$ 662

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 26/2

7:33 p.m.-6:51 a.m.

2 stops36h 18m

Lambert-St Louis

Tue 3/3

3:49 p.m.-12:30 a.m.

1 stop7h 41m

C$ 706

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to St. Louis from

How to get the cheapest flight ticket from Montreal Pierre Elliott Trudeau Intl Airport 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 cheapest month to fly to St. Louis?

The month of May is, on average, the cheapest month to fly to St. Louis from Montreal Pierre Elliott Trudeau Intl Airport, with most prices found around C$ 613. If you don’t want to visit St. Louis in May, then you should wait until April to fly from Montreal Pierre Elliott Trudeau Intl Airport, when ticket prices are also cheap, with an average price of C$ 663.

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$ 612. The most expensive day to fly to St. Louis is Saturday, with ticket prices averaging around C$ 915.

What is the cheapest Montreal Pierre Elliott Trudeau Intl to Lambert-St Louis flight route?

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

What cabin class options are available on Montreal Pierre Elliott Trudeau Intl to Lambert-St Louis flights?

There is only 1 cabin class available to choose from on Montreal Pierre Elliott Trudeau Intl 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 Pierre Elliott Trudeau Intl Airport to St. Louis flights?

No. A direct flight is the cheapest option for a flight between Montreal Pierre Elliott Trudeau Intl Airport to St. Louis.

When to book flights from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis

Are you open to changing your travel dates? Check out the ideal times to fly from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Montreal Pierre Elliott Trudeau Intl Airport to St. Louis (YUL to STL) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis

Fastest flight time

2h 47m

Direct flights

Mon

Airports in St. Louis

1 airport
The fastest flight from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis takes 2h 47m
Direct flights go from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis on Monday. The only airline offering direct flights is Air Canada.
There is 1 airport in St. Louis. From Montreal Pierre Elliott Trudeau Intl Airport there are direct flights to Lambert-St Louis (STL).
Search flight deals

  • How far is Montreal Pierre Elliott Trudeau Intl to Lambert-St Louis by plane?

    A flight from Montreal Pierre Elliott Trudeau Intl to Lambert-St Louis will travel around 1551.0 km. By plane, this route typically takes 2h 47m.

  • When did momondo last update prices for flights from Montreal Pierre Elliott Trudeau Intl Airport to Lambert-St Louis Airport?

    Prices for flights from Montreal Pierre Elliott Trudeau Intl Airport to Lambert-St Louis Airport are updated daily.

  • How many operators does momondo search for flights from Montreal Pierre Elliott Trudeau Intl Airport to Lambert-St Louis Airport?

  • How old do you have to be to fly from Montreal Pierre Elliott Trudeau Intl Airport to Lambert-St Louis Airport?

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Montreal Pierre Elliott Trudeau Intl Airport to Lambert-St Louis Airport.

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

    The travel and health documents required for your trip to Lambert-St Louis Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Lambert-St Louis Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

  • What is the most popular plane model from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis?

  • What is the most popular airline from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis?

Best airlines flying from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis

Compare and see reviews for airlines that fly from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis with momondo
Airline
Rating
Free Cancellation
Price
United AirlinesPriceFrom C$ 450Free CancellationRating
7.4
9,245 reviews
Search United Airlines flights
Air CanadaPriceFrom C$ 535Free CancellationRating
7.1
10,697 reviews
Search Air Canada flights
WestJetPriceFrom C$ 695Free CancellationRating
7.2
3,255 reviews
Search WestJet flights

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

momondo does allow users to show only those flights to St. Louis from Montreal which offer a flexible booking policy as well as other useful filters and features.

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

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to St. Louis from Montreal.

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