$149 Cheap Flights from St. Thomas (STT) to Washington (IAD)

View $149 flight on Wed, Dec 10, 2025Opens in a new window

Popular airlines from Cyril E. King Airport (STT) to Washington Dulles Intl. Airport (IAD)

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Cheap Flights from St. Thomas to Washington (STT-IAD)

Prices were available within the past 7 days and start at $149 for one-way flights and $293 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

American Airlines
Fri, Dec 5 - Mon, Dec 8
STT
St. Thomas
IAD
Washington
$293 Roundtrip, found 3 days ago
$293
Roundtrip
found 3 days ago
Select American Airlines flight, departing Fri, Dec 5 from St. Thomas to Washington, returning Mon, Dec 8, priced at $293 found 3 days ago
United
Sun, Dec 21 - Mon, Dec 29
STT
St. Thomas
IAD
Washington
$294 Roundtrip, found 4 hours ago
$294
Roundtrip
found 4 hours ago
Select United flight, departing Sun, Dec 21 from St. Thomas to Washington, returning Mon, Dec 29, priced at $294 found 4 hours ago
American Airlines
Fri, Dec 5 - Mon, Dec 8
STT
St. Thomas
IAD
Washington
$298 Roundtrip, found 3 days ago
$298
Roundtrip
found 3 days ago
Select American Airlines flight, departing Fri, Dec 5 from St. Thomas to Washington, returning Mon, Dec 8, priced at $298 found 3 days ago
Delta
Thu, Dec 25 - Tue, Dec 30
STT
St. Thomas
IAD
Washington
$303 Roundtrip, found 6 days ago
$303
Roundtrip
found 6 days ago
Select Delta flight, departing Thu, Dec 25 from St. Thomas to Washington, returning Tue, Dec 30, priced at $303 found 6 days ago
United
Fri, Dec 5 - Mon, Dec 8
STT
St. Thomas
IAD
Washington
$322 Roundtrip, found 3 days ago
$322
Roundtrip
found 3 days ago
Select United flight, departing Fri, Dec 5 from St. Thomas to Washington, returning Mon, Dec 8, priced at $322 found 3 days ago
United
Sun, Dec 21 - Mon, Dec 29
STT
St. Thomas
IAD
Washington
$327 Roundtrip, found 4 hours ago
$327
Roundtrip
found 4 hours ago
Select United flight, departing Sun, Dec 21 from St. Thomas to Washington, returning Mon, Dec 29, priced at $327 found 4 hours ago
American Airlines
Wed, Jan 14 - Sun, Jan 18
STT
St. Thomas
IAD
Washington
$328 Roundtrip, found 6 days ago
$328
Roundtrip
found 6 days ago
Select American Airlines flight, departing Wed, Jan 14 from St. Thomas to Washington, returning Sun, Jan 18, priced at $328 found 6 days ago
United
Wed, Mar 4 - Tue, Mar 10
STT
St. Thomas
IAD
Washington
$331 Roundtrip, found 10 hours ago
$331
Roundtrip
found 10 hours ago
Select United flight, departing Wed, Mar 4 from St. Thomas to Washington, returning Tue, Mar 10, priced at $331 found 10 hours ago
United
Fri, Feb 13 - Tue, Feb 17
STT
St. Thomas
IAD
Washington
$334 Roundtrip, found 2 days ago
$334
Roundtrip
found 2 days ago
Select United flight, departing Fri, Feb 13 from St. Thomas to Washington, returning Tue, Feb 17, priced at $334 found 2 days ago
American Airlines
Fri, Dec 5 - Mon, Dec 8
STT
St. Thomas
IAD
Washington
$339 Roundtrip, found 3 days ago
$339
Roundtrip
found 3 days ago
Select American Airlines flight, departing Fri, Dec 5 from St. Thomas to Washington, returning Mon, Dec 8, priced at $339 found 3 days ago

Find the cheapest month to fly from St. Thomas (STT) to Washington (IAD)

October is typically the cheapest month to fly

From $400 - $893 per traveler.

Alternative airports near Washington

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

Select flight to Ronald Reagan Washington National DCA. Closest option available. Average driving time to city center is 8 minutes. Flights from $449
DCA
Ronald Reagan Washington National
Closest
Average driving time to city center8 min
Flights from $449

Frequently asked questions

How much does a flight from Cyril E. King Airport (STT) to Washington Dulles Intl. Airport (IAD) cost?
Snag a cheap one-way flight from $149 or cheap return flight from $293 from Cyril E. King Airport (STT) to Washington Dulles Intl. Airport (IAD) 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 Cyril E. King Airport (STT) to Washington Dulles Intl. Airport (IAD)?
The cheapest month to fly from STT to IAD is December, when demand is low. Off-peak season is often when better flight deals are available between these airports.
Which airlines fly direct from Cyril E. King Airport (STT) to Washington Dulles Intl. Airport (IAD)?
You can fly nonstop from Cyril E. King Airport (STT) to Washington Dulles Intl. Airport (IAD) on a United Airlines flight.
What is the cheapest airline that flies from Cyril E. King Airport (STT) to Washington Dulles Intl. Airport (IAD)?
Expedia's filter tool lets you easily compare different airlines, departure times and fares all in one place. Choose your preferences, then sort by "Price (lowest to highest)" to see which carrier offers the cheapest STT to IAD flight.
How many flights per day from Cyril E. King Airport (STT) to Washington Dulles Intl. Airport (IAD)?
On average, Cyril E. King Airport (STT) only has 1 direct flight to Washington Dulles Intl. Airport (IAD) per day. To explore more options, try Expedia's easy-to-use filter tool. Enter your preferred travel dates, then select "1 Stop" or "2+ Stops" to discover flights offering layovers.
What are the most popular departure times for flights from Cyril E. King Airport (STT) to Washington Dulles Intl. Airport (IAD)?
Flights between STT and IAD tend to be busiest at 1 PM. If you want a more relaxed atmosphere and potentially cheaper prices, choose a time outside the usual busy windows.
What day of the week has the most flights from STT to IAD?
Friday has the most flights from Cyril E. King Airport (STT) to Washington Dulles Intl. Airport (IAD). Consider jetting off on this day and you'll have the best chance of finding a departure that works with your plans.
What is the earliest flight from Cyril E. King Airport (STT) to Washington Dulles Intl. Airport (IAD)?
Cyril E. King Airport (STT)'s first flight to Washington Dulles Intl. Airport (IAD) is at approximately 1:05PM UTC-4. With a travel time of 4h 19m, you'll land at around 4:24PM UTC-5.
How long does it take to fly from Cyril E. King Airport (STT) to Washington Dulles Intl. Airport (IAD)?
The average flight time from STT to IAD is 4 hours and 19 minutes, covering a distance of 1,600 mi.
What is the best time to fly from Cyril E. King Airport (STT) to Washington Dulles Intl. Airport (IAD)?
To arrive at Washington Dulles Intl. Airport (IAD) without delays, select a flight that takes off from Cyril E. King Airport (STT) before 3 PM. The likelihood of cancellations is 22% higher, on average, for departures after this time.**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 Washington from Cyril E. King Airport (STT)?
If you're traveling on a direct flight from Cyril E. King Airport (STT) to Washington, Washington Dulles Intl. Airport (IAD) is the only airport you can touch down at.
Is it cheaper to buy a plane ticket from Cyril E. King Airport (STT) to Washington Dulles Intl. Airport (IAD) last-minute?
Booking your ticket from STT to IAD shortly before your trip is generally more expensive. However, if there's some wiggle room with your departure dates and times, you could score a cheap last-minute fare.
Is it cheaper to book a STT to IAD flight and hotel package?
Securing a STT to IAD flight and hotel package is usually cheaper than booking separately. With Expedia, you can enjoy the convenience of organizing your travels all in one place. Select from our impressive range of hotels and then add flights, car rentals and activities to your booking. Bundle it all together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Cyril E. King Airport (STT) to Washington Dulles Intl. Airport (IAD)?
In most cases, you can reschedule or cancel your STT to IAD flight. However, there may be additional fees, especially if you booked over 24 hours ago. Check your itinerary for the airline's fees and policies on flight changes, or if you'd like further information, visit our Customer Service portal.

Travel information

Origin airport
Cyril E. King
Destination airport
Washington Dulles Intl.
Airlines serving
American Airlines, Delta, United
Roundtrip price
$293
Distance
1609 mi
Average flight time
5 hours 8 mins

Book with confidence

St. Thomas to Washington Flights

The cheapest times to fly from St. Thomas to Washington

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

 

The best time to book a flight from St. Thomas to Washington

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

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. Thomas to Washington in 2025. You can also book with separate airlines for your outbound and return journeys, from $149 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. Thomas to Washington 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. Thomas to Washington 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. Thomas to Washington Flights

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