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Cheap flights from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis from C$ 347

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 27/9. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

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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
12:31 p.m. - 8:44 p.m.YUL  Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis
9h 13m1 stop Chicago O'Hare Intl
American Airlines Logo
5:18 p.m. - 11:44 a.m.STL  Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl
17h 26m1 stop Chicago O'Hare Intl
C$ 588American Airlines
Thu, 10 Sep - Mon, 14 Sep
Delta Logo
9:28 a.m. - 8:51 p.m.YUL  Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis
12h 23m1 stop New York LaGuardia
Delta Logo
7:00 a.m. - 6:50 p.m.STL  Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl
10h 50m1 stop New York LaGuardia
C$ 662Delta
Wed, 13 Jan - Wed, 20 Jan
Air Canada Logo
4:55 p.m. - 6:42 p.m.YUL  Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis
2h 47mdirect
Air Canada Logo
12:10 p.m. - 3:42 p.m.STL  Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl
2h 32mdirect
C$ 679Air Canada
Thu, 3 Sep - Sun, 6 Sep
Air Canada Logo
4:55 p.m. - 6:41 p.m.YUL  Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis
2h 46mdirect
Air Canada Logo
12:10 p.m. - 3:41 p.m.STL  Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl
2h 31mdirect
C$ 682Air Canada
Tue, 20 Oct - Sat, 24 Oct
Air Canada Logo
4:55 p.m. - 6:41 p.m.YUL  Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis
2h 46mdirect
Air Canada Logo
12:10 p.m. - 3:41 p.m.STL  Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl
2h 31mdirect
C$ 682Air Canada
Thu, 15 Oct - Mon, 19 Oct
Air Canada Logo
8:10 a.m. - 2:00 p.m.YUL  Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis
6h 50m1 stop Toronto Pearson Intl
Air Canada Logo
12:10 p.m. - 3:41 p.m.STL  Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl
2h 31mdirect
C$ 682Air Canada
Tue, 8 Sep - Tue, 15 Sep
Air Canada Logo
4:55 p.m. - 6:42 p.m.YUL  Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis
2h 47mdirect
Air Canada Logo
12:10 p.m. - 3:41 p.m.STL  Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl
2h 31mdirect
C$ 682Air Canada
Mon, 7 Sep - Mon, 14 Sep
Air Canada Logo
10:10 a.m. - 2:00 p.m.YUL  Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis
4h 50m1 stop Toronto Pearson Intl
Air Canada Logo
12:10 p.m. - 3:41 p.m.STL  Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl
2h 31mdirect
C$ 682Air Canada
Sun, 20 Sep - Sun, 27 Sep
Air Canada Logo
4:55 p.m. - 6:42 p.m.YUL  Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis
2h 47mdirect
Air Canada Logo
12:10 p.m. - 3:41 p.m.STL  Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl
2h 31mdirect
C$ 682Air Canada
Fri, 4 Sep - Tue, 8 Sep
Air Canada Logo
4:55 p.m. - 6:41 p.m.YUL  Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis
2h 46mdirect
Air Canada Logo
12:10 p.m. - 3:41 p.m.STL  Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl
2h 31mdirect
C$ 683Air Canada
Thu, 15 Oct - Tue, 20 Oct

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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
10 Sep
YUL12:31 p.m.Montreal Pierre Elliott Trudeau Intl
9h 13m
1 stop
STL8:44 p.m.Lambert-St Louis
14 Sep
STL5:18 p.m.Lambert-St Louis
17h 26m
1 stop
YUL11:44 a.m.Montreal Pierre Elliott Trudeau Intl
C$ 588
American Airlines
27 Oct
YUL10:32 a.m.Montreal Pierre Elliott Trudeau Intl
11h 20m
1 stop
STL8:52 p.m.Lambert-St Louis
28 Oct
STL5:00 a.m.Lambert-St Louis
10h 52m
1 stop
YUL4:52 p.m.Montreal Pierre Elliott Trudeau Intl
C$ 696
American Airlines
16 Sep
YUL10:30 a.m.Montreal Pierre Elliott Trudeau Intl
11h 47m
1 stop
STL9:17 p.m.Lambert-St Louis
18 Sep
STL5:18 p.m.Lambert-St Louis
17h 26m
1 stop
YUL11:44 a.m.Montreal Pierre Elliott Trudeau Intl
C$ 744

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

Our best WestJet deals on Montreal Pierre Elliott Trudeau Intl Airport to St. Louis flight tickets
WestJet
11 Sep
YUL5:10 p.m.Montreal Pierre Elliott Trudeau Intl
4h 25m
1 stop
STL8:35 p.m.Lambert-St Louis
17 Sep
STL10:29 a.m.Lambert-St Louis
11h 58m
1 stop
YUL11:27 p.m.Montreal Pierre Elliott Trudeau Intl
C$ 697
WestJet
25 Aug
YUL12:44 p.m.Montreal Pierre Elliott Trudeau Intl
24h 02m
1 stop
STL11:46 a.m.Lambert-St Louis
28 Aug
STL6:20 a.m.Lambert-St Louis
16h 20m
1 stop
YUL11:40 p.m.Montreal Pierre Elliott Trudeau Intl
C$ 710
WestJet
25 Aug
YUL5:10 p.m.Montreal Pierre Elliott Trudeau Intl
4h 32m
1 stop
STL8:42 p.m.Lambert-St Louis
28 Aug
STL6:05 a.m.Lambert-St Louis
24h 00m
2 stops
YUL7:05 a.m.Montreal Pierre Elliott Trudeau Intl
C$ 714

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 13 August 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

Cheapest round-trip

MontrealSt. Louis

YUL Montreal Pierre Elliott Trudeau Intl - STL Lambert-St Louis

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 10/9

12:31 p.m.-8:44 p.m.

1 stop9h 13m

Lambert-St Louis

Mon 14/9

5:18 p.m.-11:44 a.m.

1 stop17h 26m

C$ 588

MontrealSt. Louis

YUL Montreal Pierre Elliott Trudeau Intl - STL Lambert-St Louis

YULSTL

Montreal Pierre Elliott Trudeau Intl

Wed 13/1

9:28 a.m.-8:51 p.m.

1 stop12h 23m

Lambert-St Louis

Wed 20/1

7:00 a.m.-6:50 p.m.

1 stop10h 50m

C$ 662

MontrealSt. Louis

YUL Montreal Pierre Elliott Trudeau Intl - STL Lambert-St Louis

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 3/9

4:55 p.m.-6:42 p.m.

Nonstop2h 47m

Lambert-St Louis

Sun 6/9

12:10 p.m.-3:42 p.m.

Nonstop2h 32m

C$ 679
Quickest round-trip

MontrealSt. Louis

YUL Montreal Pierre Elliott Trudeau Intl - STL Lambert-St Louis

YULSTL

Montreal Pierre Elliott Trudeau Intl

Tue 20/10

4:55 p.m.-6:41 p.m.

Nonstop2h 46m

Lambert-St Louis

Sat 24/10

12:10 p.m.-3:41 p.m.

Nonstop2h 31m

C$ 682

MontrealSt. Louis

YUL Montreal Pierre Elliott Trudeau Intl - STL Lambert-St Louis

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 15/10

4:55 p.m.-6:41 p.m.

Nonstop2h 46m

Lambert-St Louis

Mon 19/10

12:10 p.m.-3:41 p.m.

Nonstop2h 31m

C$ 682

MontrealSt. Louis

YUL Montreal Pierre Elliott Trudeau Intl - STL Lambert-St Louis

YULSTL

Montreal Pierre Elliott Trudeau Intl

Tue 8/9

8:10 a.m.-2:00 p.m.

1 stop6h 50m

Lambert-St Louis

Tue 15/9

12:10 p.m.-3:41 p.m.

Nonstop2h 31m

C$ 682

MontrealSt. Louis

YUL Montreal Pierre Elliott Trudeau Intl - STL Lambert-St Louis

YULSTL

Montreal Pierre Elliott Trudeau Intl

Mon 7/9

4:55 p.m.-6:42 p.m.

Nonstop2h 47m

Lambert-St Louis

Mon 14/9

12:10 p.m.-3:41 p.m.

Nonstop2h 31m

C$ 682

MontrealSt. Louis

YUL Montreal Pierre Elliott Trudeau Intl - STL Lambert-St Louis

YULSTL

Montreal Pierre Elliott Trudeau Intl

Sun 20/9

10:10 a.m.-2:00 p.m.

1 stop4h 50m

Lambert-St Louis

Sun 27/9

12:10 p.m.-3:41 p.m.

Nonstop2h 31m

C$ 682

MontrealSt. Louis

YUL Montreal Pierre Elliott Trudeau Intl - STL Lambert-St Louis

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 4/9

4:55 p.m.-6:42 p.m.

Nonstop2h 47m

Lambert-St Louis

Tue 8/9

12:10 p.m.-3:41 p.m.

Nonstop2h 31m

C$ 682

MontrealSt. Louis

YUL Montreal Pierre Elliott Trudeau Intl - STL Lambert-St Louis

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 15/10

4:55 p.m.-6:41 p.m.

Nonstop2h 46m

Lambert-St Louis

Tue 20/10

12:10 p.m.-3:41 p.m.

Nonstop2h 31m

C$ 683

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 typical price of a round-trip flight between Montreal Pierre Elliott Trudeau Intl Airport and St. Louis?

Prices are currently typical for flights on this route.

Typical prices usually range from C$ 615 to C$ 1,100.
The lowest price recently found on this route was C$ 662.

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

The month of August is, on average, the cheapest month to fly to St. Louis from Montreal Pierre Elliott Trudeau Intl Airport, with most prices found around C$ 616. If you don’t want to visit St. Louis in August, then you should wait until November to fly from Montreal Pierre Elliott Trudeau Intl Airport, when ticket prices are also cheap, with an average price of C$ 756.

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$ 722. The most expensive day to fly to St. Louis is Tuesday, with ticket prices averaging around C$ 1,670.

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 afternoon when flights can be purchased for as low as C$ 774. If you have a flexible travel schedule, then try to avoid flying in the morning when prices are C$ 1,670 on average. Flights to St. Louis from Montreal Pierre Elliott Trudeau Intl Airport in the morning 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 Airport to St. Louis flights?

There are 2 cabin classes available to choose from on Montreal Pierre Elliott Trudeau Intl Airport to 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 35% 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$ 1,670

Fastest flight time

2h 46m

Direct flights

Every day

Airports in St. Louis

1 airport
The best flight deal from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis found on momondo in the last 72 hours is C$ 1,670
The fastest flight from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis takes 2h 46m
Direct flights go from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis every day.
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

Frequently asked questions about flying from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis

  • 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 46m.

  • 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$ 562Free CancellationRating
7.1
11,466 reviews
Search Air Canada flights

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

    The lowest priced Air Canada flight from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis from the last 72 hours was C$ 562. Generally, Air Canada has 7 flights on this route every week with an average price of C$ 794. Air Canada is rated 7.1/10 by our users.

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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