Latest deals
Insights
When to book
FAQs
Reviews
Price Alerts

Cheap flights from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis from $182

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 9/3. 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
0 bags

Discover deals from 900+ travel sites with momondo.

Save money when you book flights with momondo

Big names and deals

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

Find the cheapest flights from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis (YUL-STL)

Cheap round-trip flights

American Airlines Logo
5:15 pm - 9:26 amYUL-STL
17h 11m1 stop
American Airlines Logo
7:23 am - 4:33 pmSTL-YUL
8h 10m1 stop
$337American Airlines
Find Deal
Fri, Sep 26 - Mon, Sep 29
American Airlines Logo
5:15 pm - 9:26 amYUL-STL
17h 11m1 stop
American Airlines Logo
7:23 am - 4:33 pmSTL-YUL
8h 10m1 stop
$338American Airlines
Find Deal
Fri, Sep 26 - Mon, Sep 29
Delta Logo
6:00 am - 2:43 pmYUL-STL
9h 43m1 stop
Delta Logo
6:00 am - 4:14 pmSTL-YUL
9h 14m1 stop
$443Delta
Find Deal
Wed, Aug 27 - Tue, Sep 9
United Airlines Logo
6:15 am - 2:33 pmYUL-STL
9h 18m1 stop
United Airlines Logo
5:30 pm - 10:40 amSTL-YUL
16h 10m1 stop
$448United Airlines
Find Deal
Thu, Aug 28 - Tue, Sep 9
United Airlines Logo
6:15 am - 3:44 pmYUL-STL
10h 29m1 stop
United Airlines Logo
7:04 pm - 11:57 amSTL-YUL
15h 53m1 stop
$450United Airlines
Find Deal
Thu, Aug 28 - Mon, Sep 8
Logo
6:45 am - 2:21 pmYUL-STL
8h 36m1 stop
Logo
10:35 am - 12:27 amSTL-YUL
12h 52m2 stops
$456
Find Deal
Mon, Aug 25 - Thu, Sep 11
Delta Logo
6:00 am - 2:43 pmYUL-STL
9h 43m1 stop
Delta Logo
6:00 am - 9:48 pmSTL-YUL
14h 48m1 stop
$457Delta
Find Deal
Tue, Aug 26 - Sun, Sep 7
Air Canada Logo
6:10 pm - 7:57 pmYUL-STL
2h 47mnonstop
Air Canada Logo
1:30 pm - 5:00 pmSTL-YUL
2h 30mnonstop
$510Air Canada
Find Deal
Fri, Sep 26 - Sun, Sep 28
Air Canada Logo
6:10 pm - 7:57 pmYUL-STL
2h 47mnonstop
Air Canada Logo
9:15 am - 4:20 pmSTL-YUL
6h 05m1 stop
$521Air Canada
Find Deal
Fri, Sep 26 - Sun, Sep 28
Logo
6:00 am - 1:32 pmYUL-STL
8h 32m1 stop
Logo
10:35 am - 12:27 amSTL-YUL
12h 52m2 stops
$574
Find Deal
Sun, Aug 24 - Thu, Sep 11

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
Sep 26
YUL5:15 pmMontreal Pierre Elliott Trudeau Intl
17h 11m
1 stop
STL9:26 amLambert-St Louis
Sep 29
STL7:23 amLambert-St Louis
8h 10m
1 stop
YUL4:33 pmMontreal Pierre Elliott Trudeau Intl
$337
Find similar
American Airlines
Sep 26
YUL5:15 pmMontreal Pierre Elliott Trudeau Intl
17h 11m
1 stop
STL9:26 amLambert-St Louis
Sep 29
STL7:23 amLambert-St Louis
8h 10m
1 stop
YUL4:33 pmMontreal Pierre Elliott Trudeau Intl
$338
Find similar
American Airlines
Sep 25
YUL12:31 pmMontreal Pierre Elliott Trudeau Intl
8h 54m
1 stop
STL8:25 pmLambert-St Louis
Sep 29
STL7:23 amLambert-St Louis
8h 10m
1 stop
YUL4:33 pmMontreal Pierre Elliott Trudeau Intl
$340
Find similar

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
Sep 26
YUL6:10 pmMontreal Pierre Elliott Trudeau Intl
2h 47m
STL7:57 pmLambert-St Louis
Sep 28
STL1:30 pmLambert-St Louis
2h 30m
YUL5:00 pmMontreal Pierre Elliott Trudeau Intl
$510
Find similar
Air Canada
Sep 26
YUL6:10 pmMontreal Pierre Elliott Trudeau Intl
2h 47m
STL7:57 pmLambert-St Louis
Sep 28
STL9:15 amLambert-St Louis
6h 05m
1 stop
YUL4:20 pmMontreal Pierre Elliott Trudeau Intl
$521
Find similar
Air Canada
Sep 25
YUL6:10 pmMontreal Pierre Elliott Trudeau Intl
2h 47m
STL7:57 pmLambert-St Louis
Sep 29
STL4:05 pmLambert-St Louis
4h 35m
1 stop
YUL9:40 pmMontreal Pierre Elliott Trudeau Intl
$524
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 832,500 searches. Data last updated August 4, 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

Fri 9/26

5:15 pm-9:26 am

1 stop17h 11m

Lambert-St Louis

Mon 9/29

7:23 am-4:33 pm

1 stop8h 10m

$337

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 9/26

5:15 pm-9:26 am

1 stop17h 11m

Lambert-St Louis

Mon 9/29

7:23 am-4:33 pm

1 stop8h 10m

$338

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Wed 8/27

6:00 am-2:43 pm

1 stop9h 43m

Lambert-St Louis

Tue 9/9

6:00 am-4:14 pm

1 stop9h 14m

$443

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 8/28

6:15 am-2:33 pm

1 stop9h 18m

Lambert-St Louis

Tue 9/9

5:30 pm-10:40 am

1 stop16h 10m

$448

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 8/28

6:15 am-3:44 pm

1 stop10h 29m

Lambert-St Louis

Mon 9/8

7:04 pm-11:57 am

1 stop15h 53m

$450

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Mon 8/25

6:45 am-2:21 pm

1 stop8h 36m

Lambert-St Louis

Thu 9/11

10:35 am-12:27 am

2 stops12h 52m

$456

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Tue 8/26

6:00 am-2:43 pm

1 stop9h 43m

Lambert-St Louis

Sun 9/7

6:00 am-9:48 pm

1 stop14h 48m

$457

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 9/26

6:10 pm-7:57 pm

Nonstop2h 47m

Lambert-St Louis

Sun 9/28

1:30 pm-5:00 pm

Nonstop2h 30m

$510

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 9/26

6:10 pm-7:57 pm

Nonstop2h 47m

Lambert-St Louis

Sun 9/28

9:15 am-4:20 pm

1 stop6h 05m

$521

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Sun 8/24

6:00 am-1:32 pm

1 stop8h 32m

Lambert-St Louis

Thu 9/11

10:35 am-12:27 am

2 stops12h 52m

$574

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

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?

In general, May is the cheapest month to fly from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $448. The month of April is another great option to travel to St. Louis, with average flight prices from Montreal Pierre Elliott Trudeau Intl Airport averaging around $485.

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

The cheapest day to depart on your flight to St. Louis is on a Friday when prices can be found for as low as $256. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Thursday because tickets tend to average around $609. These prices are subject to change though, so be sure to set up a Price Alert for flights to St. Louis.

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

Flying to St. Louis from Montreal Pierre Elliott Trudeau Intl Airport in the evening is the least expensive time of day to depart. momondo users have found prices as low as $283 when looking at flights departing in the evening. At noon is when there is more demand to fly to St. Louis, so prices are often more expensive at around $593 per ticket.

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 3 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 9% 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

$182

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 Pierre Elliott Trudeau Intl Airport in the past 72 hours is $182. 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 $337.
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 every day.
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 963.7 mi. 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 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 refreshed on a daily basis.

  • 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 offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify 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 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 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 $433Free CancellationRating
7.1
9,879 reviews
Search Air Canada flights
DeltaPriceFrom $452Free CancellationRating
8.0
7,987 reviews
Search Delta flights

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

    Air Canada flight deals from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis start from $433 round-trip. Over the 7 Air Canada flights for this route in a normal week, average airfare is usually $542 round-trip - but some users have found much cheaper deals with momondo.

Traveling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
St. Charles
Chesterfield
Hermann
Fairview Heights
Maryland Heights
Florissant
Fenton
Collinsville
O'Fallon
Alton
St. Peters
Farmington
Wentzville
Festus
Glencoe
Eureka
Edwardsville
Clayton
Shrewsbury
Grafton

Why use momondo?

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

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to St. Louis from Montreal.

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?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight 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?

Yes momondo offers price alerts on flights to St. Louis from Montreal. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when 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.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Sat 8/9
Sat 8/16
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to the United States