IAD - STT

$145 Find Cheap Flights from Washington Dulles Airport to Saint Thomas Island

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Dulles Intl to Saint Thomas Island departing on 11/27. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy

KAYAK searches hundreds of travel sites at once for deals on flights to Saint Thomas Island

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Washington, D.C. to Saint Thomas Island, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Washington, D.C. to Saint Thomas Island, as well as popular online travel agencies
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Flight Deals

Cheap Flights from Dulles Intl to Saint Thomas Island (IAD-STT)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Dulles Intl to Saint Thomas Island that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Dulles Intl to Saint Thomas Island

Thu, Jan 29 - Mon, Feb 2
United Airlines Logo
8:59 am - 1:56 pmIAD-STT
3h 57mnonstop
United Airlines Logo
5:25 pm - 11:18 pmSTT-IAD
6h 53m1 stop
$366United Airlines
Find Deal
Sat, Nov 22 - Thu, Nov 27
Multiple Airlines Logo
8:44 am - 2:30 pmIAD-STT
28h 46m1 stop
Multiple Airlines Logo
3:25 pm - 7:50 amSTT-IAD
17h 25m1 stop
$367Multiple Airlines
Find Deal
Tue, Dec 30 - Tue, Jan 6
Multiple Airlines Logo
9:58 pm - 2:28 pmIAD-STT
15h 30m1 stop
Multiple Airlines Logo
3:23 pm - 11:38 amSTT-IAD
21h 15m2 stops
$368Multiple Airlines
Find Deal
Wed, Jan 7 - Wed, Jan 14
United Airlines Logo
8:59 am - 1:56 pmIAD-STT
3h 57mnonstop
United Airlines Logo
1:02 pm - 4:25 pmSTT-IAD
4h 23mnonstop
$369United Airlines
Find Deal
Sat, Nov 22 - Thu, Nov 27
Multiple Airlines Logo
8:44 am - 2:30 pmIAD-STT
28h 46m1 stop
Multiple Airlines Logo
3:25 pm - 7:50 amSTT-IAD
17h 25m1 stop
$374Multiple Airlines
Find Deal
Sat, Nov 22 - Thu, Nov 27
Multiple Airlines Logo
8:44 am - 2:30 pmIAD-STT
28h 46m1 stop
Multiple Airlines Logo
2:00 pm - 11:59 pmSTT-IAD
10h 59m2 stops
$375Multiple Airlines
Find Deal
Tue, Jan 27 - Tue, Feb 3
Delta Logo
6:00 am - 3:54 pmIAD-STT
8h 54m1 stop
Delta Logo
4:00 pm - 12:07 amSTT-IAD
9h 07m1 stop
$381Delta
Find Deal
Fri, Dec 12 - Fri, Dec 19
American Airlines Logo
5:35 pm - 11:41 amIAD-STT
17h 06m1 stop
American Airlines Logo
4:34 pm - 8:42 amSTT-IAD
17h 08m1 stop
$407American Airlines
Find Deal
Thu, Jan 29 - Mon, Feb 2
American Airlines Logo
6:00 am - 3:06 pmIAD-STT
8h 06m1 stop
American Airlines Logo
4:25 pm - 11:12 pmSTT-IAD
7h 47m1 stop
$448American Airlines
Find Deal
Wed, Feb 18 - Wed, Feb 25
Delta Logo
6:00 am - 3:54 pmIAD-STT
8h 54m1 stop
Delta Logo
3:00 pm - 12:07 amSTT-IAD
10h 07m1 stop
$459Delta
Find Deal

Everything you should know

Our travelers' advice
AI-generated summary based on content written by travel experts
Dulles features the AeroTrain for quick terminal transit.
Licensed taxis at STT have dome lights and 'TP' plates.
Expert advice
Expert advice
Expert advice
Expert advice
Top airlines
United Airlines
Cheapest • from $366 (round-trip)
Delta
Best reviews • 7.9 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
When to book
3 weeks
in advance
Our data shows that travelers who book at least 3 weeks in advance save around 29% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
September
Cheapest • 28% price drop
April
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Cheapest round-trip
$366
Overall average: $660
United Airlines
Thu 1/29Mon 2/2
IAD - STT • Non-stop
Cheapest non-stop
$369
Typical prices: $483-$800
United Airlines
Wed 1/7Wed 1/14
IAD - STT • Non-stop
Start a new search
KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Saint Thomas Island!
Booking Insights

KAYAK's insights & trends for Dulles Intl to Saint Thomas Island flights

Get data-powered insights and trends into flights from Dulles Intl to Saint Thomas Island to help you find the cheapest flights, the best time to fly and much more.

What’s the cheapest day of the week to fly from Washington Dulles Airport to Saint Thomas Island?

The average price of all round-trip flights from Washington, D.C. Dulles Intl Airport to Saint Thomas Island clicked on KAYAK for each day over the last 12 months.

Your flight ticket price will generally be cheaper if you fly to Saint Thomas Island on a Tuesday and more expensive on a Saturday. On your return trip to Washington Dulles Airport, you should consider flying back on a Friday, and avoid Mondays for better deals.

What is the cheapest month to fly from Washington, D.C. Dulles Intl Airport to Saint Thomas Island?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Washington, D.C. Dulles Intl Airport to Saint Thomas Island, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Washington, D.C. Dulles Intl Airport to Saint Thomas Island is September, where tickets cost $494 (return) on average. On the other hand, the most expensive months are March and April, where the average cost of round-trip tickets is $931 and $805 respectively.

Can I save money by flying with a layover from Washington, D.C. Dulles Intl Airport to Saint Thomas Island?

The average round-trip price for all non-stop flights, flights with one layover, and flights with two layovers for the route found by users searching on KAYAK in the last 2 weeks.

No, with an average price for the route of $635, prices are generally cheapest when you fly direct.

How far in advance should I book a flight from Washington, D.C. Dulles Intl Airport to Saint Thomas Island?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Washington, D.C. Dulles Intl Airport to Saint Thomas Island, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from Washington, D.C. Dulles Intl Airport to Saint Thomas Island, you should book around 3 weeks before departure, which saves you about 29% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 26 weeks before departure.

Expert advice

Expert advice for your flight from Dulles Intl to Saint Thomas Island

 
Snippets provided in this section are AI-generated based on a summarization of KAYAK-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.
KAYAK teamed up with top travel experts to share the best tips for your journey.
Airports
IAD

Dulles offers the AeroTrain and mobile lounges for quick transit between terminals. Plan your route in advance to save time.

Read more about IADby Stefanie Waldek
STT

At STT, taxis with dome lights and 'TP' plates are licensed. Confirm rates before boarding to avoid surprises.

Read more about STTby Marisa Garcia
Our travel experts
Marisa Garcia

Marisa Garcia

Expert on STT

Marisa Garcia

Marisa Garcia

Marisa knows planes inside and out, spending 16 years working on aircraft in hangars at airports around the world. She is an aviation industry expert, specialized in airline interiors and regulations. Ten years ago, she pivoted to journalism. She shares her insights in leading aviation, travel, and business publications and on her site FlightChic.

Read more
Stefanie Waldek

Stefanie Waldek

Expert on IAD

Stefanie Waldek

Stefanie Waldek

Stefanie Waldek is a freelance space, travel, and design writer based in Saratoga Springs, NY. Her words have appeared in Space.com, Travel + Leisure, Condé Nast Traveler, Architectural Digest, and House Beautiful, among other publications. An expert in aviation and expedition cruising, Stefanie is frequently up in the air or on the sea, likely en route to Antarctica or the Arctic.

Read more

Good to know

Low seasonSeptember
Cheapest flight$135
Best time to beat the crowds with an average 29% drop in price.
Most popular time to fly with an average 16% increase in price.
Flight from Washington Dulles Airport to Saint Thomas Island

When to book flights from Dulles Intl to Saint Thomas Island

Are your dates flexible? Find out the best times to travel from Dulles Intl to Saint Thomas Island based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking Washington Dulles Airport to Saint Thomas Island flights

  • What is the cheapest flight from Washington, D.C. Dulles Intl Airport to Saint Thomas Island?

    In the last 3 days, the lowest price for a flight from Washington, D.C. Dulles Intl Airport to Saint Thomas Island was $135 for a one-way ticket and $366 for a round-trip.

  • Do I need a passport to fly between Washington Dulles Airport and Saint Thomas Island?

    Yes, you'll most likely have to show a valid passport before boarding the plane in Washington Dulles Airport and on arrival in Saint Thomas Island.

  • Which airports will I be using when flying from Washington Dulles Airport to Saint Thomas Island?

    When flying out of Washington Dulles Airport you will be using Washington, D.C. Dulles Intl. You will be landing at Saint Thomas Island, also known as Saint Thomas Island Cyril E King.

  • Which airlines offer Wi-Fi service onboard planes from Washington Dulles Airport to Saint Thomas Island?

    American Airlines, and Delta offer inflight Wi-Fi service on the Washington Dulles Airport to Saint Thomas Island flight route.

  • Which aircraft models fly most regularly from Washington Dulles Airport to Saint Thomas Island?

    The Boeing 737 MAX 8 is the aircraft model that flies most regularly on the Washington Dulles Airport to Saint Thomas Island flight route.

  • Which airline alliances offer flights from Washington Dulles Airport to Saint Thomas Island?

    SkyTeam, and Star Alliance are the airline alliances operating flights between Washington Dulles Airport and Saint Thomas Island, with SkyTeam being the most commonly used for this route.

  • On which days can I fly direct from Washington Dulles Airport to Saint Thomas Island?

    There are nonstop flights from Washington Dulles Airport to Saint Thomas Island on a daily basis.

  • Which is the best airline for flights from Washington, D.C. to Saint Thomas Island, Delta or United Airlines?

    The two airlines most popular with KAYAK users for flights from Washington, D.C. to Saint Thomas Island are Delta and United Airlines. With an average price for the route of $691 and an overall rating of 7.9, Delta is the most popular choice. United Airlines is also a great choice for the route, with an average price of $700 and an overall rating of 7.4.

  • How does KAYAK find such low prices on flights from Washington Dulles Airport to Saint Thomas Island?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Washington Dulles Airport to Saint Thomas Island.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Washington Dulles Airport to Saint Thomas Island?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Saint Thomas Island from Washington Dulles Airport is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Washington Dulles Airport to Saint Thomas Island?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Saint Thomas Island with an airline and back to Washington Dulles Airport with another airline. Booking your flights between Washington Dulles Airport and STT can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Washington Dulles Airport to Saint Thomas Island?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Saint Thomas Island from Washington Dulles Airport up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

KAYAK’s top tips for finding a cheap flight from Washington, D.C. Dulles Intl Airport to Saint Thomas Island

  • Looking for a cheap flight? 25% of our users found flights on this route for $358 or less one-way and $477 or less round-trip.

Prefer to fly direct from Washington Dulles Airport to Saint Thomas Island?

 
Direct data is based off flight results for the next 60 days. Find direct flights from all airlines flying direct from Washington, D.C. Dulles Intl to Saint Thomas Island Cyril E King.
Find which airlines fly direct from Washington, D.C. Dulles Intl Airport to Saint Thomas Island Cyril E King Airport, which days they fly and book direct flights.

Direct departures

Washington, D.C. Dulles Intl to Saint Thomas Island Cyril E King

Monday

United Airlines

United Airlines

Tuesday

United Airlines

United Airlines

Wednesday

United Airlines

United Airlines

Thursday

United Airlines

United Airlines

Friday

United Airlines

United Airlines

Saturday

United Airlines

United Airlines

Sunday

United Airlines

United Airlines

See more direct flights

Direct returns

Saint Thomas Island Cyril E King to Washington, D.C. Dulles Intl

Monday

United Airlines

United Airlines

Tuesday

United Airlines

United Airlines

Wednesday

United Airlines

United Airlines

Thursday

United Airlines

United Airlines

Friday

United Airlines

United Airlines

Saturday

United Airlines

United Airlines

Sunday

United Airlines

United Airlines

See more direct flights

Reviews of the top 3 airlines serving from Dulles Intl to Saint Thomas Island

 
See real verified KAYAK customer reviews for airlines flying from Washington, D.C. to Saint Thomas Island. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Dulles Intl to Saint Thomas Island? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.9
DeltaOverall score based on 7976 reviews
7.3Food
7.9Entertainment
7.9Comfort
8.5Crew
8.2Boarding
Airline reviews

The aircraft interior is old and tired on this aircraft. The entertainment system never worked despite the crews attempt to reset the system.

6.0 GoodDavid, Oct 2025JFK - KEF
Read more Delta reviews

The aircraft interior is old and tired on this aircraft. The entertainment system never worked despite the crews attempt to reset the system.

The flight used a B767 with a very old interior from before 2014. The entertainment system did not work at all during the flight despite attempts to reset the system. It was like they flew this route just to be competitive.

Old plane and old configuration/seats but still comfortable for a morning flight

They changed planes and the new plane couldn’t carry enough fuel to fly across the country so we had to stop in Kansas City to refuel. Flight was delayed .

Flight was too crowded and seats are too small, especially since passengrs are getting larger. Having a middle seat is ALWAYS tough! Woman on my left was large & kept creeping in to my space. Flight personnel were great! Have more savory rather than sweet snacks please.

Flight was crowded and the woman sitting on my left was large & kept crouching in to my space. You need bigger seats or smaller passengers to fit into the seats you DO have! Snack were OK. Would appreciate if airlines had more savory rather than sweet snacks, thank you!

Delayed flight (1hour) plus a long layover after an overnight flight with no backup plane available.

We were delayed, which I think had to do with air traffic control. Otherwise, everything was great.

The boarding process needs to be refined. Sometimes the gate crew calls out the zones and then flip to showing the.zones boarding on the gate monitor display. So, unless you are huddled around the gate lanes watching the monitor, you could miss your boarding zone. Suggest the zones be announced each time a new zone is allowed to board.

The boarding process needs to be refined. Sometimes the gate crew call out the boarding zone, and then flip to the monitor to show which zones are boarding. So unless everyone is gathered around to see the monitor there is usually confusion as wi which zones are boarding.

Same as last comment. Food sucks. Quality. Not surprising most people have no clue about nourishment Clearly

During booking, I kept trying submitting my payment from the Mexican website and it didn't work. After I had the idea to change it to the Canadian website, it worked but I had to be charged the equivalent of 50 CAD more. I received the clear instruction that I would only be able to check-in at the airport and that it was impossible to select a seat 24 hours before departure, that I had to pay 144 CAD to do so, although not only was I able to check-in 24 hours before departure, but I could have selected my seats for free then. All in all, I almost threw $200 out the window due to misleading information. Besides, the app kept crashing, the information to get to the gate on the app was inaccurate, my gate was switched and I was only informed once in the air (luckily I had noticed the departure pannel), I was not addressed in my language beforehand and even if I tried I was immediately answered in English (which meant the crew understood but didn't want to answer accordingly), there was only one snack & beverage service on my medium haul flight and no beverage service on my short haul flight. To be fair, the planes were comfortable, the crew apart from the language issue was helpful, dynamic and engaging, the plane was clean and the directions were clear and direct. United has a lot of potential to be one of my favourite airlines, but the devil is in the details and a lot of them missed the target.

Better WiFi. I cannot understand that in 2025, United is so behind on a technology that is now a necessity and still painfully unreliable, slow and keeps disconnecting.

Great service on board. Boarding a bit slow due to process. Food was pretty average.

Very small cramped plane for an international flight. Everything else was good, but it was maybe the smallest comfort-wise I've ever been on for longer than 3-4 hours and the trip was 7.5

Flight was delayed 3 hours. No food and drink vouchers was provided. They offered a mini pretzel bag and water .

Staff was rude. Didn’t give water for 2 hours. Worst service

Was on time until within 1 hour of flight-how does that happen? Staff very friendly.

I liked the choice of lemon ginger tea. I think stewardesses can be more considerate of older people needs.

We were given vouchers we couldn’t use with a 5.5 hour delay

Seats are not very comfortable, maybe a little more padding for a 2hr plus flight

Very sad about what Spirit has become, because the flights I had with them were delayed between an hour and a half and two, terrible service

Vegas is such a quick flight that amenities aren’t the important part, in my opinion. Just get me there efficiently and safely, and that’s exactly what they did!

The flight was severely delayed due to the missing flight attendants.

Absolutely horrible. Usually pay $40-$50 to check luggage in. I tried to check my suitcase in and the price is raised to $70. That's ridiculously greedy c'mon. I had to leave my suitcase with all my clothes and hygiene products and repurchase once i landed in Atlanta. You guys make it really stressful to travel. Don't even want to travel anymore.

They cancelled the flight 3 hours prior departure. Had to spend $400 for a ne way flight with Delta Airlines! Spirit Airlines are not serios!

My luggage didn’t arrive at LAX, so that wasn’t a good experience.

Terrible seat, no in flight entertainment. No complimentary food or drinks. Seats really hurt my back after flying spirit for the day.

Plastic seat really hurt my back. Cannot even recline on the flight. Very hard to sleep on the plane due to terrible seats . Food and drinks were expensive and not very good. There were like 2 open exit rows behind me. My isle was full so I asked flight attendants if I could sit there. They told me it was a safety issue??? I think it more unsafe to have no one sitting there. In case of emergency, you’d want someone there to help.

The delays and the lack of communication and organization within the airport itself for Staffing this flight and coordinating the paper log necessary to depart was ridiculous and deplorable

Everything you need to know for your flight from Dulles Intl to Saint Thomas Island

Information on your arrival and departure airports

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