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Cheap flights from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis from C$ 251

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 3/9. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Find the cheapest flights from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis (YUL-STL)

Cheap round-trip flights

American Airlines Logo
12:30 p.m. - 8:32 p.m.YUL-STL
9h 02m1 stop
American Airlines Logo
9:56 a.m. - 11:46 a.m.STL-YUL
24h 50m1 stop
C$ 445American Airlines
Find Deal
Wed, 3 Sep - Sat, 6 Sep
American Airlines Logo
5:15 p.m. - 9:26 a.m.YUL-STL
17h 11m1 stop
American Airlines Logo
7:23 a.m. - 4:33 p.m.STL-YUL
8h 10m1 stop
C$ 466American Airlines
Find Deal
Fri, 26 Sep - Mon, 29 Sep
American Airlines Logo
12:31 p.m. - 8:25 p.m.YUL-STL
8h 54m1 stop
American Airlines Logo
6:05 a.m. - 4:33 p.m.STL-YUL
9h 28m1 stop
C$ 470American Airlines
Find Deal
Thu, 25 Sep - Mon, 29 Sep
Delta Logo
11:00 a.m. - 10:02 p.m.YUL-STL
12h 02m2 stops
Delta Logo
7:00 a.m. - 8:04 p.m.STL-YUL
12h 04m2 stops
C$ 530Delta
Find Deal
Wed, 3 Sep - Sat, 6 Sep
Delta Logo
6:00 a.m. - 4:06 p.m.YUL-STL
11h 06m2 stops
Delta Logo
7:00 a.m. - 8:04 p.m.STL-YUL
12h 04m2 stops
C$ 568Delta
Find Deal
Wed, 3 Sep - Sat, 6 Sep
United Airlines Logo
6:15 a.m. - 2:33 p.m.YUL-STL
9h 18m1 stop
United Airlines Logo
5:30 p.m. - 10:40 a.m.STL-YUL
16h 10m1 stop
C$ 617United Airlines
Find Deal
Thu, 28 Aug - Tue, 9 Sep
United Airlines Logo
6:15 a.m. - 3:44 p.m.YUL-STL
10h 29m1 stop
United Airlines Logo
7:04 p.m. - 11:57 a.m.STL-YUL
15h 53m1 stop
C$ 620United Airlines
Find Deal
Thu, 28 Aug - Mon, 8 Sep
Logo
6:45 a.m. - 2:21 p.m.YUL-STL
8h 36m1 stop
Logo
10:35 a.m. - 12:27 a.m.STL-YUL
12h 52m2 stops
C$ 628
Find Deal
Mon, 25 Aug - Thu, 11 Sep
Air Canada Logo
6:10 p.m. - 7:57 p.m.YUL-STL
2h 47mdirect
Air Canada Logo
1:30 p.m. - 5:00 p.m.STL-YUL
2h 30mdirect
C$ 703Air Canada
Find Deal
Fri, 26 Sep - Sun, 28 Sep
Air Canada Logo
6:10 p.m. - 7:57 p.m.YUL-STL
2h 47mdirect
Air Canada Logo
1:30 p.m. - 5:00 p.m.STL-YUL
2h 30mdirect
C$ 715Air Canada
Find Deal
Thu, 25 Sep - Mon, 29 Sep

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
3 Sep
YUL12:30 p.m.Montreal Pierre Elliott Trudeau Intl
9h 02m
1 stop
STL8:32 p.m.Lambert-St Louis
6 Sep
STL9:56 a.m.Lambert-St Louis
24h 50m
1 stop
YUL11:46 a.m.Montreal Pierre Elliott Trudeau Intl
C$ 445
Find similar
American Airlines
26 Sep
YUL5:15 p.m.Montreal Pierre Elliott Trudeau Intl
17h 11m
1 stop
STL9:26 a.m.Lambert-St Louis
29 Sep
STL7:23 a.m.Lambert-St Louis
8h 10m
1 stop
YUL4:33 p.m.Montreal Pierre Elliott Trudeau Intl
C$ 466
Find similar
American Airlines
25 Sep
YUL12:31 p.m.Montreal Pierre Elliott Trudeau Intl
8h 54m
1 stop
STL8:25 p.m.Lambert-St Louis
29 Sep
STL6:05 a.m.Lambert-St Louis
9h 28m
1 stop
YUL4:33 p.m.Montreal Pierre Elliott Trudeau Intl
C$ 470
Find similar

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

Our best Delta deals on Montreal Pierre Elliott Trudeau Intl Airport to St. Louis flight tickets
Delta
3 Sep
YUL11:00 a.m.Montreal Pierre Elliott Trudeau Intl
12h 02m
2 stops
STL10:02 p.m.Lambert-St Louis
6 Sep
STL7:00 a.m.Lambert-St Louis
12h 04m
2 stops
YUL8:04 p.m.Montreal Pierre Elliott Trudeau Intl
C$ 530
Find similar
Delta
3 Sep
YUL6:00 a.m.Montreal Pierre Elliott Trudeau Intl
11h 06m
2 stops
STL4:06 p.m.Lambert-St Louis
6 Sep
STL7:00 a.m.Lambert-St Louis
12h 04m
2 stops
YUL8:04 p.m.Montreal Pierre Elliott Trudeau Intl
C$ 568
Find similar
Delta
27 Aug
YUL6:00 a.m.Montreal Pierre Elliott Trudeau Intl
9h 43m
1 stop
STL2:43 p.m.Lambert-St Louis
10 Sep
STL6:00 a.m.Lambert-St Louis
9h 14m
1 stop
YUL4:14 p.m.Montreal Pierre Elliott Trudeau Intl
C$ 610
Find similar

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 5 August 2025.
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

Wed 3/9

12:30 p.m.-8:32 p.m.

1 stop9h 02m

Lambert-St Louis

Sat 6/9

9:56 a.m.-11:46 a.m.

1 stop24h 50m

C$ 445

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 26/9

5:15 p.m.-9:26 a.m.

1 stop17h 11m

Lambert-St Louis

Mon 29/9

7:23 a.m.-4:33 p.m.

1 stop8h 10m

C$ 466

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 25/9

12:31 p.m.-8:25 p.m.

1 stop8h 54m

Lambert-St Louis

Mon 29/9

6:05 a.m.-4:33 p.m.

1 stop9h 28m

C$ 470

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Wed 3/9

11:00 a.m.-10:02 p.m.

2 stops12h 02m

Lambert-St Louis

Sat 6/9

7:00 a.m.-8:04 p.m.

2 stops12h 04m

C$ 530

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Wed 3/9

6:00 a.m.-4:06 p.m.

2 stops11h 06m

Lambert-St Louis

Sat 6/9

7:00 a.m.-8:04 p.m.

2 stops12h 04m

C$ 568

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 28/8

6:15 a.m.-2:33 p.m.

1 stop9h 18m

Lambert-St Louis

Tue 9/9

5:30 p.m.-10:40 a.m.

1 stop16h 10m

C$ 617

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 28/8

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

1 stop10h 29m

Lambert-St Louis

Mon 8/9

7:04 p.m.-11:57 a.m.

1 stop15h 53m

C$ 620

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Mon 25/8

6:45 a.m.-2:21 p.m.

1 stop8h 36m

Lambert-St Louis

Thu 11/9

10:35 a.m.-12:27 a.m.

2 stops12h 52m

C$ 628

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 26/9

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

Nonstop2h 47m

Lambert-St Louis

Sun 28/9

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

Nonstop2h 30m

C$ 703

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 25/9

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

Nonstop2h 47m

Lambert-St Louis

Mon 29/9

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

Nonstop2h 30m

C$ 715

Flights are sorted by cheapest round-trip flights 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$ 617. 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$ 668.

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$ 617. The most expensive day to fly to St. Louis is Monday, with ticket prices averaging around C$ 1,047.

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$ 852 on average. Flights to St. Louis from Montreal Pierre Elliott Trudeau Intl Airport in the evening are generally more expensive because this time of day is more convenient for travellers’ schedules.

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 are 1 cabin classes 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?

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

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

Best price found

C$ 251

Fastest flight time

2h 47m

Direct flights

Mon, Tue, Wed, Thu, Fri and Sat

Airports in St. Louis

1 airport
The best one-way flight to St. Louis from Montreal Pierre Elliott Trudeau Intl Airport in the past 72 hours is C$ 251. The best round-trip flight deal from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis found on momondo in the last 72 hours is C$ 445.
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, Tuesday, Wednesday, Thursday, Friday and Saturday. Airlines offering direct flights are: United Airlines and Air Canada.
There is 1 airport near St. Louis: 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
Air CanadaPriceFrom C$ 540Free CancellationRating
7.1
9,890 reviews
Search Air Canada flights
United AirlinesPriceFrom C$ 591Free CancellationRating
7.4
8,916 reviews
Search United Airlines flights
WestJetPriceFrom C$ 738Free CancellationRating
7.2
2,997 reviews
Search WestJet flights

  • United Airlines Flights From Montreal Pierre Elliott Trudeau Intl Airport to St. Louis

    The lowest priced United Airlines flight from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis from the last 72 hours was C$ 429. Generally, United Airlines has 7 flights on this route every week with an average price of C$ 540. United Airlines is rated 7.4/10 by our users.

  • Air Canada Flights From Montreal Pierre Elliott Trudeau Intl Airport to St. Louis

    Air Canada (7.1/10 from 9,890 reviews) operates around 7 flights from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis in any given week. The average Air Canada airfare for this route is around C$ 539, with deals from around C$ 392 rare but found on momondo. Referenced prices are for round-trip Montreal Pierre Elliott Trudeau Intl Airport to St. Louis flight searches in the last 72 hours.

Travelling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
Edwardsville
Chesterfield
Collinsville
Litchfield

Why use momondo?

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

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Montreal to St. Louis. momondo saves you time and could save you money on your trip.

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.

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

Price alerts on flights to St. Louis from Montreal are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

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