$272 Cheap Flights from St. Thomas (STT) to Washington (IAD)

View $272 flight on Mon, May 4, 2026Opens 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 $272 for one-way flights and $460 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Wed, Apr 29 - Wed, May 6
STT
St. Thomas
IAD
Washington
$460 Roundtrip, found 2 hours ago
$460
Roundtrip
found 2 hours ago
Select United flight, departing Wed, Apr 29 from St. Thomas to Washington, returning Wed, May 6, priced at $460 found 2 hours ago
United
Wed, Apr 29 - Wed, May 6
STT
St. Thomas
IAD
Washington
$465 Roundtrip, found 2 hours ago
$465
Roundtrip
found 2 hours ago
Select United flight, departing Wed, Apr 29 from St. Thomas to Washington, returning Wed, May 6, priced at $465 found 2 hours ago
American Airlines
Wed, Apr 29 - Wed, May 6
STT
St. Thomas
IAD
Washington
$469 Roundtrip, found 2 hours ago
$469
Roundtrip
found 2 hours ago
Select American Airlines flight, departing Wed, Apr 29 from St. Thomas to Washington, returning Wed, May 6, priced at $469 found 2 hours ago
Delta
Wed, Sep 24 - Sun, Sep 28
STT
St. Thomas
IAD
Washington
$469 Roundtrip, found 1 day ago
$469
Roundtrip
found 1 day ago
Select Delta flight, departing Wed, Sep 24 from St. Thomas to Washington, returning Sun, Sep 28, priced at $469 found 1 day ago
United
Tue, Aug 5 - Mon, Aug 18
STT
St. Thomas
IAD
Washington
$474 Roundtrip, found 5 days ago
$474
Roundtrip
found 5 days ago
Select United flight, departing Tue, Aug 5 from St. Thomas to Washington, returning Mon, Aug 18, priced at $474 found 5 days ago
United
Sat, Oct 25 - Tue, Oct 28
STT
St. Thomas
IAD
Washington
$485 Roundtrip, found 1 day ago
$485
Roundtrip
found 1 day ago
Select United flight, departing Sat, Oct 25 from St. Thomas to Washington, returning Tue, Oct 28, priced at $485 found 1 day ago
United
Sat, Oct 25 - Tue, Oct 28
STT
St. Thomas
IAD
Washington
$490 Roundtrip, found 1 day ago
$490
Roundtrip
found 1 day ago
Select United flight, departing Sat, Oct 25 from St. Thomas to Washington, returning Tue, Oct 28, priced at $490 found 1 day ago
United
Thu, Dec 4 - Mon, Dec 8
STT
St. Thomas
IAD
Washington
$503 Roundtrip, found 2 days ago
$503
Roundtrip
found 2 days ago
Select United flight, departing Thu, Dec 4 from St. Thomas to Washington, returning Mon, Dec 8, priced at $503 found 2 days ago
Delta
Sat, Oct 25 - Mon, Nov 10
STT
St. Thomas
IAD
Washington
$504 Roundtrip, found 1 day ago
$504
Roundtrip
found 1 day ago
Select Delta flight, departing Sat, Oct 25 from St. Thomas to Washington, returning Mon, Nov 10, priced at $504 found 1 day ago
United
Fri, Jul 18 - Tue, Jul 22
STT
St. Thomas
IAD
Washington
$508 Roundtrip, found 5 days ago
$508
Roundtrip
found 5 days ago
Select United flight, departing Fri, Jul 18 from St. Thomas to Washington, returning Tue, Jul 22, priced at $508 found 5 days ago

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

November is typically the cheapest month to fly

From $418 - $818 per traveler.

Graph displaying average flight prices per month

Flights from St. Thomas (STT) to Washington (IAD)
Origin airport
Cyril E. King
Destination airport
Washington Dulles Intl.
Airlines serving
American Airlines, Delta, United
Roundtrip price
$460
Distance
1609 mi
Average flight time
5 hours 12 mins

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 April. 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 $272 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.

 

Frequently asked questions

How much does a flight from Cyril E. King Airport (STT) to Washington Dulles Intl. Airport (IAD) cost?
You can pick up cheap return tickets starting from $510 from Cyril E. King Airport (STT) to Washington Dulles Intl. Airport (IAD). This information is based on the cheapest price found on Expedia for this return journey departing within the next three months. This airfare is for a United flight leaving STT on July 10 2025 and touching down at IAD. The price was last updated on June 18 2025 and has not changed since.
What is the cheapest month to fly from STT to IAD?
The cheapest flights from STT to IAD are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
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 STT to IAD?
Fly from STT to IAD with United. This airline currently offers the lowest one-way fare on this route, starting from $341. This fare is based on the lowest price found on Expedia departing within the next three months. The flight takes off from STT on July 10 2025. Prices were last updated on June 18 2025 and have not changed since.
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.

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