IAD - STT

$148 Find Cheap Flights from Washington Dulles Airport to Saint Thomas Island - Compare and Save

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 8/28. 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, 0 bags

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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Everything you should know

Cheapest round-trip
$342
Typical prices: $494-$563
Delta
Wed 9/16Thu 9/17
IAD - STT • 1 stop
Cheapest non-stop
$369
Typical prices: $334-$563
United Airlines
Sat 9/5Sat 9/12
IAD - STT • Non-stop
Top airlines
Cheapest • from $342 (round-trip)
Best reviews • 7.8 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Nonstop flights
You can fly direct with United Airlines. Average duration is 4h 06m
Direct flights
Direct flights
+1
+1
Direct flights
Direct flights
+1
Top layover airports
Cheapest • Avg $281 (round-trip)
Shortest trip • 6h 35m (one-way)
Insights
Insights
Insights
Insights
When to book
in advance
Our data shows that travelers who book at least 3 weeks in advance save around 39% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
Cheapest • 33% price drop
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
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KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Saint Thomas Island!
Flight Deals
Booking Insights
Expert advice
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

Wed, Sep 16 - Thu, Sep 17
Delta Logo
6:00 am - 1:44 pm
IAD
-
STT
7h 44m
1 stop
Delta Logo
2:54 pm - 12:32 am
STT
-
IAD
9h 38m
1 stop
$342Delta
Sun, Sep 13 - Thu, Sep 17
Delta Logo
6:00 am - 1:44 pm
IAD
-
STT
7h 44m
1 stop
Delta Logo
2:54 pm - 12:32 am
STT
-
IAD
9h 38m
1 stop
$363Delta
Sat, Sep 5 - Sat, Sep 12
United Airlines Logo
9:00 am - 12:58 pm
IAD
-
STT
3h 58mnonstop
United Airlines Logo
4:45 pm - 8:50 pm
STT
-
IAD
4h 05mnonstop
$369United Airlines
Sun, Aug 23 - Sun, Aug 30
American Airlines Logo
5:08 am - 3:02 pm
IAD
-
STT
9h 54m
1 stop
American Airlines Logo
3:43 pm - 11:49 pm
STT
-
IAD
8h 06m
1 stop
$372American Airlines
Tue, Dec 8 - Mon, Dec 14
United Airlines Logo
8:15 am - 1:12 pm
IAD
-
STT
3h 57mnonstop
United Airlines Logo
2:15 pm - 11:00 pm
STT
-
IAD
9h 45m
1 stop
$378United Airlines
Wed, Oct 28 - Tue, Nov 3
United Airlines Logo
8:15 am - 12:12 pm
IAD
-
STT
3h 57mnonstop
United Airlines Logo
2:15 pm - 11:00 pm
STT
-
IAD
9h 45m
1 stop
$379United Airlines
Fri, Nov 27 - Wed, Dec 2
United Airlines Logo
8:15 am - 1:12 pm
IAD
-
STT
3h 57mnonstop
United Airlines Logo
2:15 pm - 8:33 pm
STT
-
IAD
7h 18m
1 stop
$395United Airlines
Sun, Aug 23 - Sat, Aug 29
American Airlines Logo
5:08 am - 3:02 pm
IAD
-
STT
9h 54m
1 stop
American Airlines Logo
3:43 pm - 10:55 pm
STT
-
IAD
7h 12m
1 stop
$396American Airlines
Sun, Sep 13 - Thu, Sep 17
Delta Logo
6:00 am - 1:44 pm
IAD
-
STT
7h 44m
1 stop
Delta Logo
2:54 pm - 12:32 am
STT
-
IAD
9h 38m
1 stop
$400Delta
Sat, Aug 22 - Sat, Aug 29
United Airlines Logo
9:00 am - 12:58 pm
IAD
-
STT
3h 58mnonstop
United Airlines Logo
4:45 pm - 8:50 pm
STT
-
IAD
4h 05mnonstop
$406United Airlines
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.

How much is a round-trip flight from Washington, D.C. Dulles Intl Airport to Saint Thomas Island?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Washington, D.C. Dulles Intl Airport to Saint Thomas Island departing in September.

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 Tuesday, and avoid Sundays 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 February, where tickets cost $369 (return) on average. On the other hand, the most expensive months are June and November, where the average cost of round-trip tickets is $683 and $683 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 $624, 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 39% 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

 
AI-powered summary based on content written by travel experts. AI can make mistakes.
KAYAK teamed up with top travel experts to share the best tips for your journey.
Our travel experts
Marisa Garcia

Marisa Garcia

Expert on STT

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.

Stefanie Waldek

Stefanie Waldek

Expert on IAD

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.

Good to know

Low seasonSeptember
Cheapest flight$148
Best time to beat the crowds with an average 8% drop in price.
Most popular time to fly and prices are also 11% lower on average.
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 5 days, the lowest price for a flight from Washington, D.C. Dulles Intl Airport to Saint Thomas Island was $148 for a one-way ticket and $342 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?

    JetBlue, Delta, and American Airlines 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?

    oneworld, SkyTeam, and Star Alliance are the airline alliances operating flights between Washington Dulles Airport and Saint Thomas Island, with oneworld 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 $553 and an overall rating of 7.8, Delta is the most popular choice. United Airlines is also a great choice for the route, with an average price of $551 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 $228 or less one-way and $549 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 4 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.
7.8
DeltaOverall score based on 8419 reviews
7.8Entertainment
8.1Boarding
7.8Comfort
7.2Food
8.5Crew
Airline reviews

We sat on the runway for over an hour before departure. That was unwelcome.

6.0 GoodAnonymous, Jun 2026
SEA - SFO
Read more Delta reviews

We sat on the runway for over an hour before departure. That was unwelcome.

Horrible. Faucet in sink not working, wifi not working. Didn’t bring food or snacks

Flight was delayed before take off and at landing. Baggage took 20 minutes. Flight crew would not serve full soft drink and had to ask multiple times before receiving water.

From checking to boarding, it was a seamless experience. The service agents were so helpful. The flight crew was so pleasant.

Gate agent showed up 20 minutes before boarding and was not at all friendly. Had to take this flight due to the one on the day before being cancelled and any later options were already full with long standby lists. Despite having paid for Delta Comfort seats, Delta did not allow me (or anyone) to choose their seat. The agent assigned them for everyone just prior to boarding. Self seat selection was allowed on the original flight. Flight staff was great - very friendly.

Flight attendants were great. Cheerful, upbeat and friendly. Jet, in particular, was fantastic.

I have Precheck. Flew HPN to DEN and return this past weekend. Delta didn't attach my Precheck number to this trip. So it was waiting in general line especially in Denver. Unavailable.

Original flight was delayed, then cancelled and the gate staff did not expedite rebooking. Also, no instructions were given that a ticket number was needed before being called to facilitate rebooking. This could have been much more organized.

Be on time? When not on time a circling for over an hour offer more than 1 bag of chips to the passengers? It was a 7 hour flight by the time we got done.

Five hour delays every hour, I wish it were all at once

Like: departed and arrived on time. Unlike: Food options for purchase allways bad, 1 of 2 of the crew members not very friendly at all. Seats and leg room aweful. At this point I am thinking on switching to AA.

Our flight was canceled same day and we were never informed. Had to pay more and worse seating on another airline.

Did not like that we couldn't complete check in on-line without providing pictures of our passports. Worry about identity theft. We had no delays and boarding was handled In an efficient manner.

Excellent! I got to Munich and was transferred to my Lufthansa flight quickly, in 15 to 20 minutes, so I did not miss my flight. However, I had checked my overhead bag at the boarding gate in Tampa. That got to Tunis the next day. That is to be expected.

WiFi didn’t exist , seats were super cramped, lights stayed on near my seat for a long time while others were dimmed, the food/trash/drink cart hit my shoulder at least a couple of times while moving, food options were down to just one option by the time it got to my row, the utensils were garbage (knife bent at a couple of places by the time I was done eating) the spoon was very flimsy plastic

Vegetarian selection could be better. Bread was too hard to chew.

Crew was friendly and competent. Food, wine, and entertainment were excellent except the raw tuna on the flight to Split. Recommend against serving that - at least as the only option. Many medical conditions do not allow people to eat raw fish.

United didn’t even try to hold the flight for me. They knew I had a tight connection and when I arrived at the gate less than 10 mins after final boarding the flight had already gone. The gate agent wasn’t even notified that I was on my way. She was told I wasn’t at the airport

Good quick flight on a small but comfortable plane. I'm 6'3 and had plenty of space.

The flight was delayed so we were dead tired, and after that the turbulence was horrible. I was very scared.

The seats were extremely cramped, with very little legroom or personal space. There was no room left in the overhead bins for a backpack, and the space under the seat in front was so limited that I could barely fit my bag underneath. Overall, the seating arrangement felt very uncomfortable and overcrowded.

As always, most AA flights that we fly are almost ALWAYS delayed and that too multiple times. Very frustrating

The small flights with Valet Luggage has a poor service

Overall a good experience, however Wifi was not working on the flight.

THe flight was an hour late. You got us on the plan and we sat on the ground for 45 minutes with no information from the pilot whatsoever. Worst flight this year.

Going non stop to lax like I paid for. Not stopping in MCI for gas. Too long of delays

Human interaction. Thought there would be more service-even a smile would have been nice.

Incoming flight was delayed, delaying boarding. It then took 30 mins to take off. Took 20 mins to get to a gate because they changed the gate last minute, crew weren’t ready so there was no one staffed to work the jet bridge. Boarding was so disorganized as is usual with American because everyone just stands around the gate regardless of boarding group.

Delays with no explanation. It could have been handled better.

Flight delay for mechanical. Inbound arrived on time. No one said why mechanical delay.

The aircraft was fine, it’s was just the service. The flight got canceled several times and that was very inconvenient for my 69 years old mom.

My checked in luggage cost was $59, almost ticket price. The first 13 rows were empty, but fly attendant did not alow women with little boy change her middle sit, sweet boy was crying, I am so sorry for mother and passengers. At the end of the flight the cabin became impossible cold. Only good was timing of departure and early landing, but it suppose to be normal.

Seamless flight, didn’t feel like five hours at all very smooth ride. Watched two good movies didn’t even realize I was on a plane. The staff were extremely nice and helpful.

I tried to book a flight with Jet Blue. Your third party company hijacked my attempt with a website that looked like I was booking with Jet Blue. I realized it when I paid. I tried to cancel and was told by a man in India that there were no refunds. $735 stolen, Thanks Kayak!

It was inexplicably canceled and we are stuck in LA, haven't gotten home and it has been an inconvenience having lost work (on unpaid leave for my husband).

I like everything. Blythe at DCA is the absolute best!

JetBlue worker, Blythe, was so amazing at the DCA counter. If it wasn’t for her, I’m not sure we would’ve made it through. Please thank her!

They lost my luggage and refuse to help. Terrible airline. I've never experienced worse customer service in my life. Pretty much just told me too bad that I lost all my luggage, not caring that I am stuck in Europe for 2 weeks with absolutely nothing.

You should have had Wifi to make it much enjoyable.

The flight out was delayed from 3:40pm to 5pm and again to 8pm. We boarded after 5pm, had to disembark because they could not get the Engine started, then we switched gates and got a new plane and did not board until after 8pm.

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

Information on your arrival and departure airports