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£201 Cheap Flights from Montreal (YUL) to St. Louis (STL)

View £201 flight on Tue, 1 Sept 2026Opens in a new window

Popular airlines from Trudeau International Airport (YUL) to Lambert-St. Louis International Airport (STL)

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Cheap Flights from Montreal (YUL) to St. Louis (STL)

Prices were available within the past 7 days and start at £201 for one-way flights and £370 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Air Canada
Wed, 2 Sept - Wed, 16 Sept
YUL
Montreal
STL
St. Louis
£370 Return, found 5 days ago
£370
Return
found 5 days ago
Select Air Canada flight, departing Wed, 2 Sept from Montreal to St. Louis, returning Wed, 16 Sept, priced at £370 found 5 days ago
Air Canada
Wed, 2 Sept - Wed, 16 Sept
YUL
Montreal
STL
St. Louis
£376 Return, found 5 days ago
£376
Return
found 5 days ago
Select Air Canada flight, departing Wed, 2 Sept from Montreal to St. Louis, returning Wed, 16 Sept, priced at £376 found 5 days ago
Air Canada
Wed, 2 Sept - Wed, 16 Sept
YUL
Montreal
STL
St. Louis
£388 Return, found 5 days ago
£388
Return
found 5 days ago
Select Air Canada flight, departing Wed, 2 Sept from Montreal to St. Louis, returning Wed, 16 Sept, priced at £388 found 5 days ago
Air Canada
Wed, 2 Sept - Wed, 16 Sept
YUL
Montreal
STL
St. Louis
£394 Return, found 5 days ago
£394
Return
found 5 days ago
Select Air Canada flight, departing Wed, 2 Sept from Montreal to St. Louis, returning Wed, 16 Sept, priced at £394 found 5 days ago
Air Canada
Wed, 2 Sept - Wed, 16 Sept
YUL
Montreal
STL
St. Louis
£412 Return, found 5 days ago
£412
Return
found 5 days ago
Select Air Canada flight, departing Wed, 2 Sept from Montreal to St. Louis, returning Wed, 16 Sept, priced at £412 found 5 days ago
WestJet
Wed, 2 Sept - Wed, 16 Sept
YUL
Montreal
STL
St. Louis
£412 Return, found 5 days ago
£412
Return
found 5 days ago
Select WestJet flight, departing Wed, 2 Sept from Montreal to St. Louis, returning Wed, 16 Sept, priced at £412 found 5 days ago
Air Canada
Wed, 14 Oct - Wed, 21 Oct
YUL
Montreal
STL
St. Louis
£416 Return, found 2 days ago
£416
Return
found 2 days ago
Select Air Canada flight, departing Wed, 14 Oct from Montreal to St. Louis, returning Wed, 21 Oct, priced at £416 found 2 days ago
WestJet
Wed, 14 Oct - Wed, 21 Oct
YUL
Montreal
STL
St. Louis
£417 Return, found 2 days ago
£417
Return
found 2 days ago
Select WestJet flight, departing Wed, 14 Oct from Montreal to St. Louis, returning Wed, 21 Oct, priced at £417 found 2 days ago
Air Canada
Sun, 11 Oct - Sun, 18 Oct
YUL
Montreal
STL
St. Louis
£422 Return, found 2 days ago
£422
Return
found 2 days ago
Select Air Canada flight, departing Sun, 11 Oct from Montreal to St. Louis, returning Sun, 18 Oct, priced at £422 found 2 days ago
Air Canada
Sun, 11 Oct - Sun, 18 Oct
YUL
Montreal
STL
St. Louis
£428 Return, found 2 days ago
£428
Return
found 2 days ago
Select Air Canada flight, departing Sun, 11 Oct from Montreal to St. Louis, returning Sun, 18 Oct, priced at £428 found 2 days ago

Find the cheapest month to fly from Montreal (YUL) to St. Louis (STL)

January is typically the cheapest month to fly

From £254 - £570 per traveller.

Frequently asked questions

How much does a flight from Montreal, QC (YUL-Pierre Elliott Trudeau Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) cost?
You can find one-way and return flights from YUL to STL with Expedia. Flight prices vary based on the month and day of the week you want to travel, as well as the airline and how far in advance you book your ticket. Filter your search on Expedia by "Price (lowest to highest)" to see our cheapest fares first, and use the Price Tracking tool to receive alerts when YUL to STL ticket fares go up or down.
What is the cheapest month to fly from Montreal, QC (YUL-Pierre Elliott Trudeau Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
The cheapest months to fly from YUL to STL are typically during off-peak season when demand is low. Traveling in off-peak or shoulder months is usually a good way to secure cheap tickets, just remember to avoid flying during holidays if you are able to. Use the calendar view in your search to see which months have low fares on this route.
Which airlines fly direct from Montreal, QC (YUL) to St. Louis, MO (STL)?
Enter YUL to STL and your travel dates, then apply the 'Nonstop' filter to see only direct flights.
What is the cheapest airline that flies from Montreal, QC (YUL-Pierre Elliott Trudeau Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
Louis Intl.) with a layover in Philadelphia Intl. (PHL), starting from around £225. Louis Intl.), with tickets starting from around £309 for flights that can be booked for departure within the next year. Air Canada is one of the cheapest airlines offering nonstop return flights from Montreal, QC (YUL-Pierre Elliott Trudeau Intl.) to St. Louis, MO (STL-Lambert-St. American Airlines offers one of the cheapest connecting return flights from Montreal, QC (YUL-Pierre Elliott Trudeau Intl.) to St. Louis, MO (STL-Lambert-St. These prices are per adult for economy/coach class. Use Expedia's search tool to compare the prices and schedules of airlines that fly this route to find the best option for your plans and budget.
How do I find cheap flights from Montreal, QC (YUL) to St. Louis, MO (STL)?
To find a cheap flight from Montreal, QC (YUL) to St. Louis, MO (STL), be flexible with your dates. Traveling outside of peak vacation months and booking a mid-week flight can help you save. Early morning and late night flights are often more affordable, too. Expedia allows you to compare flight times, airlines and routes all in one place to find low fares. You can also set up Price Tracking and receive alerts when fares go up or down.
What is the best time to fly from Montreal, QC (YUL-Pierre Elliott Trudeau Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
The best time to fly is usually mid-week (Tuesday or Wednesday) and during early morning hours as flights tend to be cheaper, less crowded, and generally more on-time. Avoid major holidays and peak vacation seasons for smoother travel. Combining off-peak days and hours often gives the best combination of cost, comfort, and convenience.
What is the earliest flight from Montreal, QC (YUL) to St. Louis, MO (STL)?
Sort flights by "Departure (earliest)" on Expedia to find the earliest flight from Montreal, QC (YUL) to St. Louis, MO (STL). To compare more early flights, use the "Early Morning" and "Morning" filters in your search.
How long does it take to fly from Montreal, QC (YUL-Pierre Elliott Trudeau Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
Flying nonstop from YUL to STL takes around 3 hours, with the route covering approximately 1,556 kilometers. Flights with a layover typically take 3 hours longer than direct options. Keep in mind that actual flight times can vary due to wind patterns, weather, and air traffic.
Can you fly business or first class from Montreal, QC (YUL) to St. Louis, MO (STL)?
Select the "Business class" and "First class" filters when looking for Montreal, QC (YUL) to St. Louis, MO (STL) flights on Expedia. This is the easiest way to compare prices, routes and flight times for your trip.
How do I earn miles on a Montreal, QC (YUL) to St. Louis, MO (STL) flight with Expedia?
It's easy to earn miles on a Montreal, QC (YUL) to St. Louis, MO (STL) flight when you book with Expedia. Before you confirm your booking, simply select your frequent flyer program and enter your program number. As a member of One Key™, you can also earn OneKeyCash™* on top of your airline miles when you book with Expedia.*Excludes taxes and fees. OneKeyCash is not redeemable for cash and can only be used on Expedia and other participating brands.
Is it cheaper to buy a plane ticket from Montreal, QC (YUL) to St. Louis, MO (STL) at the last minute?
Typically, booking a last minute flight from Montreal, QC (YUL) to St. Louis, MO (STL) will be more expensive than booking in advance. As the departure date approaches, there are usually fewer seats available which can drive up the cost. However, if there's some wiggle room with your travel dates and times, you could bag a cheap last-minute fare.
Is it cheaper to book a Montreal, QC (YUL) to St. Louis, MO (STL) flight and hotel package?
Securing a Montreal, QC (YUL) to St. Louis, MO (STL) flight and hotel package is usually cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Select from our extensive range of stays and then add flights, activities and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Montreal, QC (YUL) to St. Louis, MO (STL)?
If you booked your Montreal, QC (YUL) to St. Louis, MO (STL) flight within the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the type of ticket you have, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal if you'd like more information.

Travel information

Origin airport
Pierre Elliott Trudeau Intl.
Destination airport
Lambert-St. Louis Intl.
Return price
£370
Distance
1547 km
Average flight time
2 hours 47 mins

Book with confidence

Compare flights from Montreal to St. Louis easily and book with confidence

For travelling on business or for pleasure, Expedia makes it easy to book your flights from Montreal to St. Louis. Operating between them flights per day, 20 airlines cover the route. And fly direct, getting you to Lambert-St. Louis Intl. in just hours. If you have a preferred carrier, use our advanced search tool to find the right flight from Pierre Elliott Trudeau Intl. to Lambert-St. Louis Intl..  

To make things even better, in the advanced search, you can also choose to fly economy, premium economy, business or first class, select your maximum number of stops, and pick your preferred departure and arrival time. You can also opt for refundable and direct flights. 

Grab a great deal on your flight from Pierre Elliott Trudeau Intl. (YUL) to Lambert-St. Louis Intl. (STL)

The easiest way to view the best deals on flights from Montreal to St. Louis today is to enter your travel dates and hit search. From here, you can sort your results by price to see the cheapest flights first. Right now, return flights from Pierre Elliott Trudeau Intl. to Lambert-St. Louis Intl. start at just £370 and range up to £428.  

To find an even better deal, try  

  • being flexible on your dates – midweek flights can be cheaper
  • looking for other airports near Montreal and St. Louis
  • booking your flight during September, the cheapest month on this route
  • varying your flight times – early morning and late at night are sometimes cheaper 

Why you should book your Montreal to St. Louis flight with Expedia!

We cater for all flight types, cabin classes and airlines. So whether you’re booking flights from Pierre Elliott Trudeau Intl. to Lambert-St. Louis Intl. for a budget break or a business trip with a bit of pleasure thrown in, we make it easy to secure the seat that’s right for you.  

Thanks to our supersized inventory that offers great choice all in one place, you know you’ll get a great deal with Expedia. Especially if you bundle your flight together with your hotel, you will unlock amazing savings. For added peace of mind, you can choose flexible bookings or filter to find refundable options, so you won’t pay a fee to change your flight.  

Compare flights from Montreal to St. Louis easily and book with confidence

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