$519 Cheap Flights from Buffalo (BUF) to Castries (SLU)

View $519 flight on Mon, Mar 16, 2026Opens in a new window

Popular airlines from Buffalo Niagara Intl. Airport (BUF) to George F. L. Charles Airport (SLU)

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Cheap Flights from Buffalo to Castries (BUF-SLU)

Prices were available within the past 7 days and start at $519 for one-way flights and $1,138 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Tue, Dec 9 - Tue, Dec 16
BUF
Buffalo
SLU
Castries
$1,138 Roundtrip, found 4 days ago
$1,138
Roundtrip
found 4 days ago
Select United flight, departing Tue, Dec 9 from Buffalo to Castries, returning Tue, Dec 16, priced at $1,138 found 4 days ago

Alternative airports near Castries

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

Select flight to Hewanorra Intl. UVF. Cheapest option available. Average driving time to city center is 53 minutes. Flights from $570
UVF
Hewanorra Intl.
Cheapest
Average driving time to city center53 min
Flights from $570
Flights from Buffalo (BUF) to Castries (SLU)
Origin airport
Buffalo Niagara Intl.
Destination airport
George F. L. Charles
Roundtrip price
$1,137
Distance
2258 mi

Buffalo to Castries Flights

The cheapest times to fly from Buffalo to Castries

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

 

The best time to book a flight from Buffalo to Castries

Sunday is one of the best days to book for cheap flights from Buffalo to Castries: 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 Castries

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 Castries in 2025. You can also book with separate airlines for your outbound and return journeys, from $519 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 Castries 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 Castries 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 George F. L. Charles Airport (SLU) cost?
Snag a cheap one-way flight from $519 or cheap return flight from $1,138 from Buffalo Niagara Intl. Airport (BUF) to George F. L. Charles Airport (SLU) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight offers on this route.
What is the cheapest month to fly from Buffalo Niagara Intl. Airport (BUF) to George F. L. Charles Airport (SLU)?
The cheapest month to fly from BUF to SLU is December, when there's less demand. Off-peak months are typically when better flight deals are available between these airports.
What is the cheapest airline that flies from Buffalo Niagara Intl. Airport (BUF) to George F. L. Charles Airport (SLU)?
Use the filters on Expedia to compare airlines and find the most affordable carrier that'll fly you from BUF to SLU. Then, sort your results by "Price (lowest to highest)" to snap up the best deal available.
How many flights per day from Buffalo Niagara Intl. Airport (BUF) to George F. L. Charles Airport (SLU)?
There aren't any daily direct flights available from Buffalo Niagara Intl. Airport (BUF) to George F. L. Charles Airport (SLU). But you can choose flights with layovers. Filter your search on Expedia to include one or two stops, and you'll be soaring above the clouds before you know it.
What day of the week has the most flights from BUF to SLU?
You'll generally find Tuesday the quietest day for flights, while Fridays are often the busiest.* However this can change from season to season and during peak travel times or public holidays.*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 George F. L. Charles Airport (SLU)?
To arrive at George F. L. Charles Airport (SLU) on time, opt for a flight that leaves Buffalo Niagara Intl. Airport (BUF) 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 Buffalo Niagara Intl. Airport (BUF) to George F. L. Charles Airport (SLU) last-minute?
Last-minute bookings from BUF to SLU are typically more expensive. To lock in the best prices, start looking for flights as early as possible. That said, if you're flexible with your travel dates, it's possible to score a cheap ticket right before your trip.
Is it cheaper to book a BUF to SLU flight and hotel package?
You'll typically save money by securing a BUF to SLU 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 it all in one convenient place. Once you've selected your ideal flights and accommodations, you can add extras like tours, car rentals and activities.
Can I cancel or change the date of my flight from Buffalo Niagara Intl. Airport (BUF) to George F. L. Charles Airport (SLU)?
It's generally possible to cancel or reschedule your BUF to SLU flight. However, for bookings made more than 24 hours ago, additional charges may apply. Refer to your airline's policies in your itinerary to see what changes are allowed 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.