Cheap Flights from Washington (IAD) to St. Thomas (SPB)
Popular airlines from Washington Dulles Intl. Airport (IAD) to St. Thomas (SPB-St. Thomas Seaplane Base)
American AirlinesAmerican Airlines
UnitedUnited
Southwest AirlinesSouthwest Airlines
DeltaDelta
Frontier AirlinesFrontier Airlines
JetBlue AirwaysJetBlue Airways
Alaska AirlinesAlaska Airlines
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Alternative airports near St. Thomas
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Washington to St. Thomas Flights
The cheapest times to fly from Washington to St. Thomas
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 Washington to St. Thomas are during the month of . You can find some of the cheapest flights from Washington to St. Thomas with Expedia's search tool and vast selection of airlines.
The best time to book a flight from Washington to St. Thomas
Sunday is one of the best days to book for cheap flights from Washington to St. Thomas: 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 Washington to St. Thomas
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 Washington to St. Thomas 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 Washington to St. Thomas 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 Washington to St. Thomas 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 Washington Dulles Intl. Airport (IAD) to St. Thomas Seaplane Base Airport (SPB) cost?
Grab a cheap one-way flight or cheap return flight from Washington Dulles Intl. Airport (IAD) to St. Thomas Seaplane Base Airport (SPB) 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 Washington Dulles Intl. Airport (IAD) to St. Thomas Seaplane Base Airport (SPB)?
is the most affordable month to fly from IAD to SPB. Planning your trip for the off-season is often the key to finding better deals on flights.
What is the cheapest airline that flies from Washington Dulles Intl. Airport (IAD) to St. Thomas Seaplane Base Airport (SPB)?
To find the cheapest airline that'll fly you from IAD to SPB, use Expedia's filter tool. Customize your search based on your travel needs, such as preferred carriers and flight duration. You can then sort your results by "Price (lowest to highest)" to see the cheapest fares upfront.
How many flights per day from Washington Dulles Intl. Airport (IAD) to St. Thomas Seaplane Base Airport (SPB)?
You'll need to take a flight with a layover if you're traveling from Washington Dulles Intl. Airport (IAD) to St. Thomas Seaplane Base Airport (SPB). Direct flights don't operate daily on this route. However, simply 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 IAD to SPB?
Friday is usually the busiest day for flights, while Tuesday tends to be the quietest.* Keep in mind that flight schedules can vary based on various factors, including the season and airline.
*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Washington Dulles Intl. Airport (IAD) to St. Thomas Seaplane Base Airport (SPB)?
To avoid potential delays on the Washington Dulles Intl. Airport (IAD) to St. Thomas Seaplane Base Airport (SPB) route, aim to fly 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 Charlotte Amalie from Washington Dulles Intl. Airport (IAD)?
Browse your flight options from Washington Dulles Intl. Airport (IAD) to Cyril E. King Airport (STT). This is the only airport in Charlotte Amalie you can arrive at if you're taking a direct flight.
Is it cheaper to buy a plane ticket from Washington Dulles Intl. Airport (IAD) to St. Thomas Seaplane Base Airport (SPB) last-minute?
Last-minute fares from IAD to SPB are typically more expensive. For the best prices, start searching for flights as soon as possible. That said, if your travel plans are flexible, you may score a cheap ticket right before your trip.
Is it cheaper to book an IAD to SPB flight and hotel package?
Compared with arranging flights and hotels separately, booking an IAD to SPB flight and hotel package with Expedia could lead to significant savings. What's more, having everything in one convenient place will take the hassle out of planning your trip. Just pick your flights and choose from our extensive range of hotels, then tailor your trip with other add-ons like tours and car rentals.
Can I cancel or change the date of my flight from Washington Dulles Intl. Airport (IAD) to St. Thomas Seaplane Base Airport (SPB)?
If you booked your IAD to SPB flight within the last 24 hours, you may be able to cancel or modify it at no cost. Depending on the airline and the type of fare 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, go to our Customer Service portal if you want more information.
Travel information
Origin airport | Washington Dulles Intl. Airport |
|---|---|
Destination airport | St. Thomas |
Distance | 1,609 miles away |