$123 Cheap Flights from St. Louis (STL) to Calgary (YYC)

View $123 flight on Mon, Dec 8, 2025Opens in a new window

Popular airlines from St. Louis Lambert Intl. Airport (STL) to Calgary International Airport (YYC)

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Cheap Flights from St. Louis to Calgary (STL-YYC)

Prices were available within the past 7 days and start at $123 for one-way flights and $320 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Mon, Nov 3 - Tue, Nov 4
STL
St. Louis
YYC
Calgary
$320 Roundtrip, found 5 days ago
$320
Roundtrip
found 5 days ago
Select United flight, departing Mon, Nov 3 from St. Louis to Calgary, returning Tue, Nov 4, priced at $320 found 5 days ago
United
Mon, Nov 3 - Fri, Nov 14
STL
St. Louis
YYC
Calgary
$339 Roundtrip, found 5 days ago
$339
Roundtrip
found 5 days ago
Select United flight, departing Mon, Nov 3 from St. Louis to Calgary, returning Fri, Nov 14, priced at $339 found 5 days ago
United
Tue, Dec 9 - Wed, Dec 24
STL
St. Louis
YYC
Calgary
$344 Roundtrip, found 4 days ago
$344
Roundtrip
found 4 days ago
Select United flight, departing Tue, Dec 9 from St. Louis to Calgary, returning Wed, Dec 24, priced at $344 found 4 days ago
United
Mon, Oct 20 - Wed, Oct 22
STL
St. Louis
YYC
Calgary
$347 Roundtrip, found 5 days ago
$347
Roundtrip
found 5 days ago
Select United flight, departing Mon, Oct 20 from St. Louis to Calgary, returning Wed, Oct 22, priced at $347 found 5 days ago
American Airlines
Mon, Oct 20 - Thu, Oct 23
STL
St. Louis
YYC
Calgary
$348 Roundtrip, found 6 hours ago
$348
Roundtrip
found 6 hours ago
Select American Airlines flight, departing Mon, Oct 20 from St. Louis to Calgary, returning Thu, Oct 23, priced at $348 found 6 hours ago
United
Sat, Oct 18 - Wed, Oct 22
STL
St. Louis
YYC
Calgary
$349 Roundtrip, found 5 days ago
$349
Roundtrip
found 5 days ago
Select United flight, departing Sat, Oct 18 from St. Louis to Calgary, returning Wed, Oct 22, priced at $349 found 5 days ago
United
Sat, Oct 25 - Mon, Oct 27
STL
St. Louis
YYC
Calgary
$350 Roundtrip, found 1 day ago
$350
Roundtrip
found 1 day ago
Select United flight, departing Sat, Oct 25 from St. Louis to Calgary, returning Mon, Oct 27, priced at $350 found 1 day ago
Alaska Airlines
Wed, Oct 15 - Thu, Oct 23
STL
St. Louis
YYC
Calgary
$370 Roundtrip, found 4 days ago
$370
Roundtrip
found 4 days ago
Select Alaska Airlines flight, departing Wed, Oct 15 from St. Louis to Calgary, returning Thu, Oct 23, priced at $370 found 4 days ago
Air Canada
Tue, Sep 30 - Wed, Oct 1
STL
St. Louis
YYC
Calgary
$500 Roundtrip, found 4 days ago
$500
Roundtrip
found 4 days ago
Select Air Canada flight, departing Tue, Sep 30 from St. Louis to Calgary, returning Wed, Oct 1, priced at $500 found 4 days ago
Delta
Sat, Oct 4 - Sat, Oct 11
STL
St. Louis
YYC
Calgary
$550 Roundtrip, just found
$550
Roundtrip
just found
Select Delta flight, departing Sat, Oct 4 from St. Louis to Calgary, returning Sat, Oct 11, priced at $550 just found

Find the cheapest month to fly from St. Louis (STL) to Calgary (YYC)

October is typically the cheapest month to fly

From $297 - $613 per traveler.

Frequently asked questions

How much does a flight from Lambert-St. Louis Intl. Airport (STL) to Calgary Intl. Airport (YYC) cost?
Secure a cheap one-way flight from $123 or cheap return flight from $320 from Lambert-St. Louis Intl. Airport (STL) to Calgary Intl. Airport (YYC) 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 Lambert-St. Louis Intl. Airport (STL) to Calgary Intl. Airport (YYC)?
November is the cheapest month to fly from STL to YYC. Timing your trip outside of the busy season is often the key to landing a great deal.
What is the cheapest airline that flies from Lambert-St. Louis Intl. Airport (STL) to Calgary Intl. Airport (YYC)?
Use the filters on Expedia to compare different airlines and find the cheapest carrier that'll fly you from STL to YYC. Then, sort your results by "Price (lowest to highest)" to snap up a great deal.
How many flights per day from Lambert-St. Louis Intl. Airport (STL) to Calgary Intl. Airport (YYC)?
You'll need to book a flight with a layover if you're traveling from Lambert-St. Louis Intl. Airport (STL) to Calgary Intl. Airport (YYC). There are no daily direct flights on this route. However, just filter your search to include one or two stops to discover an option that works for you.
What day of the week has the most flights from STL to YYC?
Typically you'll find the most flight options available on a Friday. Tuesdays are often the quietest.* But this can change 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 is the best time to fly from Lambert-St. Louis Intl. Airport (STL) to Calgary Intl. Airport (YYC)?
To land at Calgary Intl. Airport (YYC) on schedule, opt for a flight that leaves from Lambert-St. Louis Intl. Airport (STL) before 3 PM. The likelihood of cancellations is 22% higher, on average, for departures after this time.**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 Calgary Intl. Airport (YYC) last-minute?
Last-minute fares from STL to YYC are typically more expensive. For the best prices, start looking for flights as early as possible. That said, if you're flexible with your travel plans, you may score a cheap ticket just before your departure.
Is it cheaper to book a STL to YYC flight and hotel package?
You'll generally save money by securing a STL to YYC flight and hotel package compared to booking separately. In fact, travelers could save hundreds of dollars by bundling with Expedia. And it's simple to manage everything in one convenient place. Once you've chosen your ideal accommodations and flights, you can add extras like activities, tours and car rentals.
Can I cancel or change the date of my flight from Lambert-St. Louis Intl. Airport (STL) to Calgary Intl. Airport (YYC)?
In most cases, you can cancel or reschedule your STL to YYC flight. However, there may be additional fees, especially if your booking was made more than 24 hours ago. Check your itinerary for the airline's rules and fees on flight changes, or if you want further details, go to our Customer Service portal.

Travel information

Travel information

Origin airport
Lambert-St. Louis Intl.
Destination airport
Calgary Intl.
Airlines serving
Air Canada, Alaska Airlines, American Airlines, Delta, United, WestJet
Roundtrip price
$320
Distance
1428 mi

Book with confidence

Book with confidence

St. Louis to Calgary Flights

The cheapest times to fly from St. Louis to Calgary

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 Calgary are during the month of November. You can find some of the cheapest flights from St. Louis to Calgary with Expedia's search tool and vast selection of airlines.

 

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

Sunday is one of the best days to book for cheap flights from St. Louis to Calgary: 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 Calgary

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 Calgary in 2025. You can also book with separate airlines for your outbound and return journeys, from $123 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 Calgary 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 Calgary 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 Calgary Flights

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Explore a world of travel with Expedia

*Available to One Key members.