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Cheap flights from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis from C$ 340

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 5/12. 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
3:45 p.m. - 9:27 a.m.YUL-STL
18h 42m1 stop
American Airlines Logo
6:04 a.m. - 3:00 p.m.STL-YUL
7h 56m1 stop
C$ 352American Airlines
Find Deal
Thu, 19 Feb - Mon, 23 Feb
American Airlines Logo
10:05 a.m. - 9:44 p.m.YUL-STL
12h 39m2 stops
American Airlines Logo
6:04 a.m. - 3:00 p.m.STL-YUL
7h 56m1 stop
C$ 366American Airlines
Find Deal
Thu, 19 Feb - Mon, 23 Feb
United Airlines Logo
8:00 p.m. - 3:46 p.m.YUL-STL
20h 46m2 stops
United Airlines Logo
6:30 a.m. - 3:57 p.m.STL-YUL
8h 27m1 stop
C$ 646United Airlines
Find Deal
Wed, 12 Nov - Wed, 19 Nov
United Airlines Logo
4:45 p.m. - 3:46 p.m.YUL-STL
24h 01m1 stop
United Airlines Logo
5:24 p.m. - 3:57 p.m.STL-YUL
21h 33m1 stop
C$ 666United Airlines
Find Deal
Wed, 5 Nov - Wed, 12 Nov
Delta Logo
7:30 p.m. - 8:13 a.m.YUL-STL
13h 43m1 stop
Delta Logo
9:35 a.m. - 6:40 p.m.STL-YUL
8h 05m1 stop
C$ 716Delta
Find Deal
Wed, 5 Nov - Wed, 12 Nov
Delta Logo
6:20 p.m. - 11:42 p.m.YUL-STL
6h 22m1 stop
Delta Logo
5:13 p.m. - 11:59 p.m.STL-YUL
5h 46m1 stop
C$ 774Delta
Find Deal
Tue, 23 Dec - Tue, 30 Dec
Air Canada Logo
8:50 a.m. - 3:29 p.m.YUL-STL
7h 39m2 stops
Air Canada Logo
8:00 a.m. - 2:00 p.m.STL-YUL
5h 00m1 stop
C$ 858Air Canada
Find Deal
Fri, 14 Nov - Sun, 16 Nov
Air Canada Logo
8:50 a.m. - 3:29 p.m.YUL-STL
7h 39m2 stops
Air Canada Logo
6:30 a.m. - 3:16 p.m.STL-YUL
7h 46m2 stops
C$ 872Air Canada
Find Deal
Fri, 14 Nov - Sun, 16 Nov
WestJet Logo
6:45 a.m. - 9:37 a.m.YUL-STL
27h 52m2 stops
WestJet Logo
1:55 p.m. - 12:43 a.m.STL-YUL
9h 48m2 stops
C$ 883WestJet
Find Deal
Wed, 5 Nov - Wed, 12 Nov
WestJet Logo
6:45 a.m. - 4:10 p.m.YUL-STL
10h 25m2 stops
WestJet Logo
1:55 p.m. - 12:43 a.m.STL-YUL
9h 48m2 stops
C$ 901WestJet
Find Deal
Wed, 5 Nov - Wed, 12 Nov

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
19 Feb
YUL3:45 p.m.Montreal Pierre Elliott Trudeau Intl
18h 42m
1 stop
STL9:27 a.m.Lambert-St Louis
23 Feb
STL6:04 a.m.Lambert-St Louis
7h 56m
1 stop
YUL3:00 p.m.Montreal Pierre Elliott Trudeau Intl
C$ 352
Find similar
American Airlines
19 Feb
YUL10:05 a.m.Montreal Pierre Elliott Trudeau Intl
12h 39m
2 stops
STL9:44 p.m.Lambert-St Louis
23 Feb
STL6:04 a.m.Lambert-St Louis
7h 56m
1 stop
YUL3:00 p.m.Montreal Pierre Elliott Trudeau Intl
C$ 366
Find similar
American Airlines
19 Feb
YUL10:05 a.m.Montreal Pierre Elliott Trudeau Intl
12h 39m
2 stops
STL9:44 p.m.Lambert-St Louis
23 Feb
STL11:18 a.m.Lambert-St Louis
10h 27m
2 stops
YUL10:45 p.m.Montreal Pierre Elliott Trudeau Intl
C$ 374
Find similar

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

Our best United Airlines deals on Montreal Pierre Elliott Trudeau Intl Airport to St. Louis flight tickets
United Airlines
12 Nov
YUL8:00 p.m.Montreal Pierre Elliott Trudeau Intl
20h 46m
2 stops
STL3:46 p.m.Lambert-St Louis
19 Nov
STL6:30 a.m.Lambert-St Louis
8h 27m
1 stop
YUL3:57 p.m.Montreal Pierre Elliott Trudeau Intl
C$ 646
Find similar
United Airlines
5 Nov
YUL4:45 p.m.Montreal Pierre Elliott Trudeau Intl
24h 01m
1 stop
STL3:46 p.m.Lambert-St Louis
12 Nov
STL5:24 p.m.Lambert-St Louis
21h 33m
1 stop
YUL3:57 p.m.Montreal Pierre Elliott Trudeau Intl
C$ 666
Find similar
United Airlines
4 Nov
YUL6:15 p.m.Montreal Pierre Elliott Trudeau Intl
22h 34m
1 stop
STL3:49 p.m.Lambert-St Louis
19 Nov
STL6:30 a.m.Lambert-St Louis
8h 27m
1 stop
YUL3:57 p.m.Montreal Pierre Elliott Trudeau Intl
C$ 703
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 16 October 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

Thu 19/2

3:45 p.m.-9:27 a.m.

1 stop18h 42m

Lambert-St Louis

Mon 23/2

6:04 a.m.-3:00 p.m.

1 stop7h 56m

C$ 352

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 19/2

10:05 a.m.-9:44 p.m.

2 stops12h 39m

Lambert-St Louis

Mon 23/2

6:04 a.m.-3:00 p.m.

1 stop7h 56m

C$ 366

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Wed 12/11

8:00 p.m.-3:46 p.m.

2 stops20h 46m

Lambert-St Louis

Wed 19/11

6:30 a.m.-3:57 p.m.

1 stop8h 27m

C$ 646

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Wed 5/11

4:45 p.m.-3:46 p.m.

1 stop24h 01m

Lambert-St Louis

Wed 12/11

5:24 p.m.-3:57 p.m.

1 stop21h 33m

C$ 666

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Wed 5/11

7:30 p.m.-8:13 a.m.

1 stop13h 43m

Lambert-St Louis

Wed 12/11

9:35 a.m.-6:40 p.m.

1 stop8h 05m

C$ 716

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Tue 23/12

6:20 p.m.-11:42 p.m.

1 stop6h 22m

Lambert-St Louis

Tue 30/12

5:13 p.m.-11:59 p.m.

1 stop5h 46m

C$ 774

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 14/11

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

2 stops7h 39m

Lambert-St Louis

Sun 16/11

8:00 a.m.-2:00 p.m.

1 stop5h 00m

C$ 858

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 14/11

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

2 stops7h 39m

Lambert-St Louis

Sun 16/11

6:30 a.m.-3:16 p.m.

2 stops7h 46m

C$ 872

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Wed 5/11

6:45 a.m.-9:37 a.m.

2 stops27h 52m

Lambert-St Louis

Wed 12/11

1:55 p.m.-12:43 a.m.

2 stops9h 48m

C$ 883

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Wed 5/11

6:45 a.m.-4:10 p.m.

2 stops10h 25m

Lambert-St Louis

Wed 12/11

1:55 p.m.-12:43 a.m.

2 stops9h 48m

C$ 901

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$ 629. 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$ 681.

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$ 629. The most expensive day to fly to St. Louis is Monday, with ticket prices averaging around C$ 1,067.

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$ 712. If you have a flexible travel schedule, then try to avoid flying in the afternoon when prices are C$ 769 on average. Flights to St. Louis from Montreal Pierre Elliott Trudeau Intl Airport in the afternoon 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 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?

You could potentially save up to 18% 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

Direct flights

None
There are no direct flights from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis. There are no popular flight routes from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis.
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 5h 35m.

  • 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$ 550Free CancellationRating
7.1
10,306 reviews
Search Air Canada flights
United AirlinesPriceFrom C$ 602Free CancellationRating
7.4
8,982 reviews
Search United Airlines flights
WestJetPriceFrom C$ 753Free CancellationRating
7.2
3,127 reviews
Search WestJet flights

Travelling to a place near St. Louis?

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

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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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