Cheap Flights from St. Louis (STL) to St. Catharines (YCM)

Popular airlines from St. Louis Lambert Intl. Airport (STL) to St. Catharines, ON (YCM-Niagara District)

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Alternative airports near St. Catharines

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

Select flight to Buffalo Niagara Intl. BUF. Cheapest option available. Average driving time to city center is 51 minutes. Flights from $340
BUF
Buffalo Niagara Intl.
Cheapest
Average driving time to city center51 min
Flights from $340

Frequently asked questions

How much does a flight from Lambert-St. Louis Intl. Airport (STL) to St. Catharines, ON (YCM-Niagara District) cost?
Get a cheap one-way flight or cheap return flight from Lambert-St. Louis Intl. Airport (STL) to St. Catharines, ON (YCM-Niagara District) 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 St. Catharines, ON (YCM-Niagara District)?
The cheapest month to fly from STL to YCM is , when demand is low. Off-peak months are usually when airlines offer lower prices between these airports.
What is the cheapest airline that flies from Lambert-St. Louis Intl. Airport (STL) to St. Catharines, ON (YCM-Niagara District)?
To find the cheapest airline that'll fly you from STL to YCM, use Expedia's filter tool. Customize your search based on your travel needs, such as preferred carriers and number of stops. You can then sort your results by "Price (lowest to highest)" to see the cheapest flights first.
How many flights per day from Lambert-St. Louis Intl. Airport (STL) to St. Catharines, ON (YCM-Niagara District)?
You'll have to hop on a flight with a layover when traveling from Lambert-St. Louis Intl. Airport (STL) to St. Catharines, ON (YCM-Niagara District). Direct flights don't operate daily on this route. However, just filter your search to include one or more stops to discover the best option for your trip.
What day of the week has the most flights from STL to YCM?
Friday is typically the busiest day for flights, while Tuesday is often the quietest.* Just remember that flight schedules can change depending on various factors, including the carrier and season.*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 St. Catharines, ON (YCM-Niagara District)?
To avoid potential delays on the Lambert-St. Louis Intl. Airport (STL) to St. Catharines, ON (YCM-Niagara District) route, travel before 3 PM. Departures after this hour have a 22% higher chance of being canceled.**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.
What airports do you fly into for Niagara-on-the-Lake from Lambert-St. Louis Intl. Airport (STL)?
Browse your flight options from Lambert-St. Louis Intl. Airport (STL) to Pearson Intl. Airport (YYZ). This is the only airport in Niagara-on-the-Lake you can touch down at if you're taking a direct flight.
Is it cheaper to buy a plane ticket from Lambert-St. Louis Intl. Airport (STL) to St. Catharines, ON (YCM-Niagara District) last-minute?
Booking your ticket from STL to YCM shortly before your journey is usually more expensive. However, if there's some wiggle room with your schedule, you could snag a cheap last-minute fare.
Is it cheaper to book a STL to YCM flight and hotel package?
You can save money by booking a STL to YCM flight and hotel package compared to booking separately. In fact, travelers could save hundreds of dollars by bundling with Expedia. And it's easy to manage it all in one convenient place. After choosing your ideal flights and accommodations, consider adding extras including activities, tours and car rentals.
Can I cancel or change the date of my flight from Lambert-St. Louis Intl. Airport (STL) to St. Catharines, ON (YCM-Niagara District)?
Typically, you can modify or cancel your STL to YCM flight. However, additional charges may apply, especially if you booked over 24 hours ago. Check your itinerary for the airline's policies and fees on flight changes, or if you want more information, head to our Customer Service portal.

Travel information

Origin airport
Lambert-St. Louis Intl.
Destination airport
Niagara District
Distance
659 mi

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St. Louis to St. Catharines Flights

The cheapest times to fly from St. Louis to St. Catharines

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

 

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

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

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 St. Catharines 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 St. Catharines 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 St. Catharines 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 St. Catharines Flights

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*Available to One Key members.