$384 Cheap Flights from Austin (AUS) to Castries (SLU)

View $384 flight on Mon, Feb 23, 2026Opens in a new window

Popular airlines from Austin-Bergstrom Intl. Airport (AUS) to George F. L. Charles Airport (SLU)

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Cheap Flights from Austin to Castries (AUS-SLU)

Prices were available within the past 7 days and start at $384 for one-way flights and $1,149 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Sun, Dec 14 - Fri, Dec 19
AUS
Austin
SLU
Castries
$1,149 Roundtrip, found 2 days ago
$1,149
Roundtrip
found 2 days ago
Select United flight, departing Sun, Dec 14 from Austin to Castries, returning Fri, Dec 19, priced at $1,149 found 2 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 $887
UVF
Hewanorra Intl.
Cheapest
Average driving time to city center53 min
Flights from $887

Frequently asked questions

How much does a flight from Austin-Bergstrom Intl. Airport (AUS) to George F. L. Charles Airport (SLU) cost?
Lock in a cheap one-way flight from $384 or cheap return flight from $1,149 from Austin-Bergstrom Intl. Airport (AUS) 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 Austin-Bergstrom Intl. Airport (AUS) to George F. L. Charles Airport (SLU)?
Traveling in December can help you save, as it's the cheapest month for flights between AUS and SLU. You'll often find the lowest prices during the off-season.
What is the cheapest airline that flies from Austin-Bergstrom Intl. Airport (AUS) to George F. L. Charles Airport (SLU)?
Use the filters on Expedia to compare different airlines and find the most affordable carrier that'll take you from AUS to SLU. Then, sort your results by "Price (lowest to highest)" to snap up a great deal.
How many flights per day from Austin-Bergstrom Intl. Airport (AUS) to George F. L. Charles Airport (SLU)?
There aren't any daily direct flights from Austin-Bergstrom Intl. Airport (AUS) to George F. L. Charles Airport (SLU). But you can opt for flights with layovers. Filter your search results on Expedia to include one or two stops, and you'll be cruising above the clouds in no time.
What day of the week has the most flights from AUS to SLU?
Usually you'll have the most choice when it comes to flights on a Friday. Tuesdays tend to be the quietest.* However, this can vary based 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 Austin-Bergstrom Intl. Airport (AUS) to George F. L. Charles Airport (SLU)?
To touch down at George F. L. Charles Airport (SLU) without delays, choose a flight that takes off from Austin-Bergstrom Intl. Airport (AUS) before 3 PM. The likelihood 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 Austin-Bergstrom Intl. Airport (AUS) to George F. L. Charles Airport (SLU) last-minute?
Booking your plane ticket from AUS to SLU just before your trip is typically more expensive. However, if there's some wiggle room with your departure dates and times, you could land a cheap last-minute fare.
Is it cheaper to book an AUS to SLU flight and hotel package?
You'll generally save money by booking an AUS to SLU flight and hotel package compared to booking separately. In fact, you could save hundreds of dollars by bundling with Expedia. And it's easy to manage everything in one convenient place. Once you've selected your ideal accommodations and flights, consider adding extras including car rentals, activities and tours.
Can I cancel or change the date of my flight from Austin-Bergstrom Intl. Airport (AUS) to George F. L. Charles Airport (SLU)?
If you reserved your AUS to SLU flight in the last 24 hours, you may be able to cancel or modify it without any fees. Depending on the airline and the type of fare you have, 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 want more information.

Travel information

Origin airport
Austin-Bergstrom Intl.
Destination airport
George F. L. Charles
Roundtrip price
$1,149
Distance
2584 mi

Book with confidence

Austin to Castries Flights

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

 

The best time to book a flight from Austin to Castries

Sunday is one of the best days to book for cheap flights from Austin 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 Austin 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 Austin to Castries in 2025. You can also book with separate airlines for your outbound and return journeys, from $384 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 Austin 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 Austin 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.

 

Austin to Castries Flights

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*Available to One Key members.