Cheap Flights from Buffalo (BUF) to St. Louis (SUS)

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Buffalo to St. Louis Flights

The cheapest times to fly from Buffalo to St. Louis

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

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

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

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 Buffalo to St. Louis in 2026. 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 Buffalo to St. Louis 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 Buffalo to St. Louis 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 Buffalo Niagara Intl. Airport (BUF) to Spirit of St. Louis Airport (SUS) cost?

Get a cheap one-way flight or cheap return flight from Buffalo Niagara Intl. Airport (BUF) to Spirit of St. Louis Airport (SUS) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight deals on this route.

What is the cheapest month to fly from Buffalo Niagara Intl. Airport (BUF) to Spirit of St. Louis Airport (SUS)?

Planning your trip for may help you find better deals, as it's the cheapest month for flights between BUF and SUS. You'll typically find the lowest prices during off-peak months.

What is the cheapest airline that flies from Buffalo Niagara Intl. Airport (BUF) to Spirit of St. Louis Airport (SUS)?

Expedia's filter tool lets you easily compare different airlines, flight durations and fares all in one place. Customize the search to your preferences, then sort by "Price (lowest to highest)" to see which carrier offers the cheapest BUF to SUS flight.

How many flights per day from Buffalo Niagara Intl. Airport (BUF) to Spirit of St. Louis Airport (SUS)?

You'll need to take a flight with a layover when traveling from Buffalo Niagara Intl. Airport (BUF) to Spirit of St. Louis Airport (SUS). Direct flights don't operate daily on this route. However, just filter your search to include one or more stops to find an option that works for you.

What day of the week has the most flights from BUF to SUS?

Usually you'll have the most choice when it comes to flights on a Friday. Tuesdays are often the quietest.* However, this can change 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 Buffalo Niagara Intl. Airport (BUF) to Spirit of St. Louis Airport (SUS)?

Book a flight from Buffalo Niagara Intl. Airport (BUF) to Spirit of St. Louis Airport (SUS) that takes off before 3 PM to reduce the risk of cancellations and delays. Departures after this time have a 22% higher chance of being canceled, on average.*

*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 Buffalo Niagara Intl. Airport (BUF) to Spirit of St. Louis Airport (SUS) last-minute?

Holding off until right before your break to book a flight from BUF to SUS often results in higher prices. While it's possible to find some last-minute deals, there's no guarantee. Be flexible with your itinerary to boost your chances of getting a bargain.

Is it cheaper to book a BUF to SUS flight and hotel package?

You can save money by booking a BUF to SUS 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. Once you've chosen your ideal accommodations and flights, consider adding extras like car rentals, tours and activities.

Can I cancel or change the date of my flight from Buffalo Niagara Intl. Airport (BUF) to Spirit of St. Louis Airport (SUS)?

If you reserved your BUF to SUS flight in the last 24 hours, you may be able to cancel or modify it at no cost. Depending on the airline and the fare type you purchased, additional charges may apply for changes after that time. Airline policies and contact information can be found in your itinerary or confirmation email. Or, visit our Customer Service portal if you'd like more information.