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

Popular airlines from St. Louis, MO (CPS-St. Louis Downtown) to Montreal–Trudeau Intl. Airport (YUL)

    notification illustration

    Be in the know

    Get alerts if flight prices drop or rise*
    deals illustration

    Book smarter

    Save up to 30% on select hotels after you book a flight*
    trophy illustration

    Earn twice

    Earn your airline miles on top of our OneKeyCash
    Learn about One Key

Frequently asked questions

How much does a flight from St. Louis Downtown Airport (CPS) to Pierre Elliott Trudeau Intl. Airport (YUL) cost?
Get a cheap one-way flight or cheap return flight from St. Louis Downtown Airport (CPS) to Pierre Elliott Trudeau Intl. Airport (YUL) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight deals on this route.
What is the cheapest month to fly from St. Louis Downtown Airport (CPS) to Pierre Elliott Trudeau Intl. Airport (YUL)?
The cheapest month to fly from CPS to YUL is , when there's less demand. Off-peak season is often when airlines offer lower prices between these airports.
What is the cheapest airline that flies from St. Louis Downtown Airport (CPS) to Pierre Elliott Trudeau Intl. Airport (YUL)?
Expedia's filter tool lets you easily compare airlines, flight times and baggage options all in one place. Customize the search to your preferences, then sort by "Price (lowest to highest)" to find out which carrier offers the cheapest CPS to YUL flight.
How many flights per day from St. Louis Downtown Airport (CPS) to Pierre Elliott Trudeau Intl. Airport (YUL)?
Direct flights from St. Louis Downtown Airport (CPS) to Pierre Elliott Trudeau Intl. Airport (YUL) aren't available daily, so you'll need to take a flight with a layover. Explore your options with Expedia's filter tool. Enter your travel dates and choose either "1 Stop" or "2+ Stops."
What day of the week has the most flights from CPS to YUL?
Usually you'll find the most flight options available on a Friday. Tuesdays are often the quietest.* But this can vary depending on the airline, season and other factors.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from St. Louis Downtown Airport (CPS) to Pierre Elliott Trudeau Intl. Airport (YUL)?
To land at Pierre Elliott Trudeau Intl. Airport (YUL) without delays, book a flight that leaves St. Louis Downtown Airport (CPS) 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 St. Louis Downtown Airport (CPS) to Pierre Elliott Trudeau Intl. Airport (YUL) last-minute?
Last-minute fares from CPS to YUL are usually more expensive. For the best rates, start searching for flights early. That being said, if your travel plans are flexible, it's possible to score a cheap fare right before your trip.
Is it cheaper to book a CPS to YUL flight and hotel package?
Opting for a CPS to YUL flight and hotel package is generally cheaper than booking separately. With Expedia, you can enjoy the convenience of organizing your travels all in one place. Select from our wide range of hotels and then add flights, activities and car rentals to your booking. Bundle it all together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from St. Louis Downtown Airport (CPS) to Pierre Elliott Trudeau Intl. Airport (YUL)?
Typically, it's possible to reschedule or cancel your CPS to YUL flight. However, if it's been more than 24 hours since booking, additional fees may apply. Refer to your airline's policies in your itinerary to see what changes are allowed and if any costs are involved. You'll also find further details on our Customer Service portal.

Travel information

Travel information

Origin airport
St. Louis Downtown
Destination airport
Pierre Elliott Trudeau Intl.
Distance
964 mi

Book with confidence

Book with confidence

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 . 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 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.

 

St. Louis to Montreal Flights

Explore a world of travel with Expedia

Explore a world of travel with Expedia

*Available to One Key members.