$110 Cheap Flights from St. Louis (STL) to Montreal (YUL)

View $110 flight on Wed, Jan 21, 2026Opens in a new window

Popular airlines from St. Louis Lambert Intl. Airport (STL) to Montreal–Trudeau Intl. Airport (YUL)

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

Prices were available within the past 7 days and start at $110 for one-way flights and $282 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

American Airlines
Thu, Feb 19 - Tue, Feb 24
STL
St. Louis
YUL
Montreal
$282 Roundtrip, found 6 days ago
$282
Roundtrip
found 6 days ago
Select American Airlines flight, departing Thu, Feb 19 from St. Louis to Montreal, returning Tue, Feb 24, priced at $282 found 6 days ago
American Airlines
Thu, Feb 19 - Tue, Feb 24
STL
St. Louis
YUL
Montreal
$311 Roundtrip, found 6 days ago
$311
Roundtrip
found 6 days ago
Select American Airlines flight, departing Thu, Feb 19 from St. Louis to Montreal, returning Tue, Feb 24, priced at $311 found 6 days ago
American Airlines
Thu, Feb 19 - Tue, Feb 24
STL
St. Louis
YUL
Montreal
$379 Roundtrip, found 6 days ago
$379
Roundtrip
found 6 days ago
Select American Airlines flight, departing Thu, Feb 19 from St. Louis to Montreal, returning Tue, Feb 24, priced at $379 found 6 days ago
United
Thu, Feb 19 - Tue, Feb 24
STL
St. Louis
YUL
Montreal
$380 Roundtrip, found 6 days ago
$380
Roundtrip
found 6 days ago
Select United flight, departing Thu, Feb 19 from St. Louis to Montreal, returning Tue, Feb 24, priced at $380 found 6 days ago
United
Fri, Feb 20 - Sun, Feb 22
STL
St. Louis
YUL
Montreal
$382 Roundtrip, found 6 days ago
$382
Roundtrip
found 6 days ago
Select United flight, departing Fri, Feb 20 from St. Louis to Montreal, returning Sun, Feb 22, priced at $382 found 6 days ago
United
Wed, Jan 14 - Tue, Feb 3
STL
St. Louis
YUL
Montreal
$386 Roundtrip, found 1 day ago
$386
Roundtrip
found 1 day ago
Select United flight, departing Wed, Jan 14 from St. Louis to Montreal, returning Tue, Feb 3, priced at $386 found 1 day ago
United
Wed, Feb 18 - Thu, Feb 19
STL
St. Louis
YUL
Montreal
$390 Roundtrip, found 5 days ago
$390
Roundtrip
found 5 days ago
Select United flight, departing Wed, Feb 18 from St. Louis to Montreal, returning Thu, Feb 19, priced at $390 found 5 days ago
Air Canada
Wed, Dec 24 - Thu, Dec 25
STL
St. Louis
YUL
Montreal
$411 Roundtrip, found 2 days ago
$411
Roundtrip
found 2 days ago
Select Air Canada flight, departing Wed, Dec 24 from St. Louis to Montreal, returning Thu, Dec 25, priced at $411 found 2 days ago
Delta
Thu, Feb 19 - Tue, Feb 24
STL
St. Louis
YUL
Montreal
$430 Roundtrip, found 6 days ago
$430
Roundtrip
found 6 days ago
Select Delta flight, departing Thu, Feb 19 from St. Louis to Montreal, returning Tue, Feb 24, priced at $430 found 6 days ago
WestJet
Thu, Dec 18 - Thu, Jan 1
STL
St. Louis
YUL
Montreal
$986 Roundtrip, found 4 hours ago
$986
Roundtrip
found 4 hours ago
Select WestJet flight, departing Thu, Dec 18 from St. Louis to Montreal, returning Thu, Jan 1, priced at $986 found 4 hours ago

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

August is typically the cheapest month to fly

From $338 - $964 per traveler.

Alternative airports near Montreal

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Pierre Elliott Trudeau Intl. YUL. Cheapest and Closest option available. Average driving time to city center is 17 minutes. Flights from $677
YUL
Pierre Elliott Trudeau Intl.
CheapestClosest
Average driving time to city center17 min
Flights from $677
Flights from St. Louis (STL) to Montreal (YUL)
Origin airport
Lambert-St. Louis Intl.
Destination airport
Pierre Elliott Trudeau Intl.
Airlines serving
Air Canada, American Airlines, Delta, United, WestJet
Roundtrip price
$282
Distance
967 mi

St. Louis to Montreal Flights

The cheapest times to fly from St. Louis to Montreal

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from St. Louis to Montreal are during the month of February. You can find some of the cheapest flights from St. Louis to Montreal with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from St. Louis to Montreal

Sunday is one of the best days to book for cheap flights from St. Louis to Montreal: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from St. Louis to Montreal

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from St. Louis to Montreal in 2025. You can also book with separate airlines for your outbound and return journeys, from $110 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap St. Louis to Montreal flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your St. Louis to Montreal airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Frequently asked questions

How much does a flight from Lambert-St. Louis Intl. Airport (STL) to Pierre Elliott Trudeau Intl. Airport (YUL) cost?
Lock in a cheap one-way flight from $110 or cheap return flight from $282 from Lambert-St. Louis Intl. Airport (STL) to Pierre Elliott Trudeau Intl. Airport (YUL) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight offers on this route.
What is the cheapest month to fly from Lambert-St. Louis Intl. Airport (STL) to Pierre Elliott Trudeau Intl. Airport (YUL)?
The cheapest month to fly from STL to YUL is February, when there's less demand. Off-peak months are generally when airlines offer better prices between these airports.
What is the cheapest airline that flies from Lambert-St. Louis Intl. Airport (STL) to Pierre Elliott Trudeau Intl. Airport (YUL)?
To find the cheapest airline that'll fly you from STL to YUL, use Expedia's filter tool. Customize your search based on what matters most to you, such as preferred carriers and seat class. You can then sort your results by "Price (lowest to highest)" to discover the cheapest flight right away.
How many flights per day from Lambert-St. Louis Intl. Airport (STL) to Pierre Elliott Trudeau Intl. Airport (YUL)?
You'll need to book a flight with a layover if you're traveling from Lambert-St. Louis Intl. Airport (STL) to Pierre Elliott Trudeau Intl. Airport (YUL). Direct flights don't operate daily on this route. However, simply filter your search to include one or two stops to find the best option for your trip.
What day of the week has the most flights from STL to YUL?
Typically you'll find the largest variety of flight choices on a Friday. Tuesdays tend to be the quietest.* However, this can vary based on the season, airline and other factors.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What airline has the least delays from STL to YUL?
With 81% of journeys typically arriving as scheduled, Air Canada has the best on-time performance for nonstop flights from Lambert-St. Louis Intl. Airport (STL) to Pierre Elliott Trudeau Intl. Airport (YUL). To check your flight status and get notified if anything changes, use the Expedia App.
What is the best time to fly from Lambert-St. Louis Intl. Airport (STL) to Pierre Elliott Trudeau Intl. Airport (YUL)?
To touch down at Pierre Elliott Trudeau Intl. Airport (YUL) without delays, select a flight that leaves Lambert-St. Louis Intl. Airport (STL) before 3 PM. The chance of cancellations is 22% higher, on average, for departures after this hour.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from Lambert-St. Louis Intl. Airport (STL) to Pierre Elliott Trudeau Intl. Airport (YUL) last-minute?
Holding off until right before your break to book your flight from STL to YUL often results in higher prices. While you may find some last-minute discounts, they aren't always guaranteed. Keep your travel plans flexible to maximize your chances of snagging a bargain.
Is it cheaper to book a STL to YUL flight and hotel package?
Booking a STL to YUL flight and hotel package is typically cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your trip in one place. Choose from our extensive range of stays and then add flights, car rentals and activities to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Lambert-St. Louis Intl. Airport (STL) to Pierre Elliott Trudeau Intl. Airport (YUL)?
It's generally possible to cancel or reschedule your STL to YUL flight. However, if the booking was made more than 24 hours ago, additional charges may apply. Check your airline's policies in your itinerary to see what changes are possible and whether any costs are involved. You'll also find more information on our Customer Service portal.

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*Available to One Key members.