$173 Cheap United flights Washington (IAD) to St. Thomas (STT)

View $173 flight on Tue, Nov 11, 2025Opens in a new window

$173 Cheap United flights Washington (IAD) to St. Thomas (STT)

Prices were available within the past 7 days and start at $173 for one-way flights and $378 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Sat, Oct 18 - Sat, Oct 25
IAD
Washington
STT
St. Thomas
$378 Roundtrip, found 2 days ago
$378
Roundtrip
found 2 days ago
Select United flight, departing Sat, Oct 18 from Washington to St. Thomas, returning Sat, Oct 25, priced at $378 found 2 days ago
United
Tue, Oct 28 - Mon, Nov 3
IAD
Washington
STT
St. Thomas
$380 Roundtrip, found 3 days ago
$380
Roundtrip
found 3 days ago
Select United flight, departing Tue, Oct 28 from Washington to St. Thomas, returning Mon, Nov 3, priced at $380 found 3 days ago
United
Thu, Feb 26 - Wed, Mar 4
IAD
Washington
STT
St. Thomas
$385 Roundtrip, found 4 days ago
$385
Roundtrip
found 4 days ago
Select United flight, departing Thu, Feb 26 from Washington to St. Thomas, returning Wed, Mar 4, priced at $385 found 4 days ago
United
Tue, Nov 11 - Tue, Nov 18
IAD
Washington
STT
St. Thomas
$390 Roundtrip, found 2 days ago
$390
Roundtrip
found 2 days ago
Select United flight, departing Tue, Nov 11 from Washington to St. Thomas, returning Tue, Nov 18, priced at $390 found 2 days ago
United
Tue, Dec 16 - Sun, Dec 21
IAD
Washington
STT
St. Thomas
$393 Roundtrip, found 3 days ago
$393
Roundtrip
found 3 days ago
Select United flight, departing Tue, Dec 16 from Washington to St. Thomas, returning Sun, Dec 21, priced at $393 found 3 days ago
United
Sat, Oct 4 - Sat, Oct 11
IAD
Washington
STT
St. Thomas
$400 Roundtrip, found 18 hours ago
$400
Roundtrip
found 18 hours ago
Select United flight, departing Sat, Oct 4 from Washington to St. Thomas, returning Sat, Oct 11, priced at $400 found 18 hours ago
Flights from Washington (IAD) to St. Thomas (STT)
Origin airport
Washington Dulles Intl.
Destination airport
Cyril E. King
Airlines serving
American Airlines, Delta, United
Popular airline
United
Distance
1609 mi
Average flight time
3 hours 1 min

Frequently asked questions

How much is a United Airlines flight from Washington Dulles Intl. Airport (IAD) to Cyril E. King Airport (STT)?
Landing cheap one-way United Airlines flights from IAD to STT from $173 on Expedia couldn't be simpler — just filter by "Price (lowest to highest)." Or check out our affordable return fares from $378 for your next exciting vacation.**These prices were available on Expedia within the past 7 days, for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.
What is the cheapest month to fly from IAD to STT with United Airlines?
September is one of the cheapest months to jet away to St. Thomas with United Airlines. You could also find great deals on one-way and round-trip fares in October.
What is the cheapest time to book flights from Washington Dulles Intl. Airport (IAD) to Cyril E. King Airport (STT) with United Airlines?
Landing the best United Airlines deals from IAD to STT often comes down to booking at the right moment. You can save 17% on international flights when you book 18 to 29 days before takeoff instead of four to five months ahead. Better yet, you can pocket 17% on average by buying your tickets on a Sunday compared to a Friday, which is often the most expensive day to book.* It's smart to kick off your flight search about one month before you plan to travel.*Ideal booking window recommendation is based on average round-trip ticket prices for January through November for 2024. Best day of the week to book recommendation is based on average round-trip ticket prices for January through October 2024. All data sourced from ARC's global airline sales database.
Does United Airlines fly nonstop from Washington Dulles Intl. Airport (IAD) to Cyril E. King Airport (STT)?
Easily travel from Washington Dulles Intl. Airport (IAD) to Cyril E. King Airport (STT) on any of United Airlines's 7 weekly direct flights. Use our "Nonstop" and "Airline" filters to find the United Airlines flight that'll get you to STT at your preferred time.
How long does it take to fly from IAD to STT with United Airlines?
Depart Washington Dulles Intl. Airport (IAD) for Cyril E. King Airport (STT) on a nonstop United Airlines flight, and you'll be in the sky for around 3h 56m.
What is the earliest United Airlines flight from IAD to STT?
Departing IAD at 8:15AM UTC-5, the earliest United Airlines flight to STT lands at 1:11PM UTC-4. Traveling earlier in the day means you're less likely to encounter delays.* Prefer a later start? The last United Airlines flight from IAD to STT departs at 9:00AM UTC-5 and touches down at 1:56PM UTC-4.*Most reliable time of the day recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
What airports does United Airlines fly into in St. Thomas?
United Airlines flights from Washington Dulles Intl. Airport (IAD) to St. Thomas come in to land at Cyril E. King Airport (STT). This is the main entry point to this destination.
Why fly with United Airlines from IAD to STT?
Travel from IAD to STT with United Airlines and you'll enjoy a range of benefits starting with a rewarding loyalty program. When you book through Expedia as a United Mileage Plus and One Key™ member, you may also earn OneKeyCash™* to redeem on select future travel purchases.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.
What type of plane does United Airlines fly from Washington Dulles Intl. Airport (IAD) to Cyril E. King Airport (STT)?
United Airlines generally operates Boeing 737 MAX 8 planes for flights from Washington Dulles Intl. Airport (IAD) to Cyril E. King Airport (STT). Remember that aircraft type can change depending on operational demands, so the plane you'll be on might be different on your travel date.
Can I change or cancel my United Airlines flight from Washington Dulles Intl. Airport (IAD) to Cyril E. King Airport (STT)?
Changes are usually free within 24 hours of making a booking, but your airline may charge you after that time. For further details about altering your reservation, go to your "Trips," select your flight and click on "Manage Booking." If you want the flexibility to update your itinerary without being charged, check the "Changes included" and "No cancel fee" filters when planning your next getaway.

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*Available to One Key members.