Find flights
Deals
When to book
FAQs & Tips
Airlines

IAD - USM

Find cheap flights from Washington Dulles Airport to Koh Samui from $1,331

This is the cheapest round-trip flight price found by a KAYAK user in the last 72 hours by searching for a flight from Dulles Intl to Koh Samui departing on 5/23. 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
0 bags
Thu 6/6
Thu 6/13

Search hundreds of travel sites at once for deals on flights to Koh Samui

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Washington, D.C. to Koh Samui, 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 Koh Samui, as well as popular online travel agencies
In the last 7 days travelers have searched 43,707,506 times on KAYAK, and here is why:

Save 21% or moreCompare multiple travel sites with one search.

Track pricesNot ready to book? Create a price alert for when prices drop.

Filter your dealsChoose cabin class, free Wi-Fi and more.

Bundle and saveSave money when you bundle your flight + hotel.

Cheap flight deals from Dulles Intl to Koh Samui (IAD-USM)

Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Dulles Intl to Koh Samui 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 and deals for you by selecting your travel dates.
Choose your dates
4:40 pm - 9:15 pmIAD-USM
41h 35m2 stops
6:25 pm - 2:45 pmUSM-IAD
31h 20m2 stops
$1,331Turkish Airlines
Find Deal
Thu, May 23 - Mon, Jun 10
4:40 pm - 9:15 pmIAD-USM
41h 35m2 stops
6:55 pm - 2:45 pmUSM-IAD
30h 50m2 stops
$1,365Turkish Airlines
Find Deal
Thu, May 23 - Mon, Jun 10
9:50 pm - 10:10 amIAD-USM
25h 20m2 stops
1:30 pm - 2:45 pmUSM-IAD
60h 15m2 stops
$1,445Turkish Airlines
Find Deal
Thu, Aug 22 - Thu, Aug 29
4:40 pm - 9:20 amIAD-USM
29h 40m2 stops
1:30 pm - 7:55 pmUSM-IAD
41h 25m2 stops
$1,609
Find Deal
Fri, Jul 19 - Sat, Jul 27
9:50 pm - 9:15 pmIAD-USM
36h 25m2 stops
1:30 pm - 7:55 pmUSM-IAD
41h 25m2 stops
$1,704Turkish Airlines
Find Deal
Thu, Aug 1 - Sat, Aug 17
10:00 pm - 11:40 amIAD-USM
26h 40m2 stops
7:10 pm - 1:30 pmUSM-IAD
29h 20m3 stops
$1,753
Find Deal
Thu, May 23 - Mon, Jun 10
10:00 pm - 1:45 pmIAD-USM
28h 45m2 stops
9:15 pm - 4:40 pmUSM-IAD
30h 25m2 stops
$1,799Etihad Airways
Find Deal
Fri, May 31 - Sat, Jun 8
5:38 pm - 9:15 pmIAD-USM
64h 37m3 stops
1:30 pm - 4:33 pmUSM-IAD
38h 03m2 stops
$2,364Singapore Airlines
Find Deal
Thu, Aug 22 - Thu, Aug 29
7:41 pm - 6:20 pmIAD-USM
59h 39m2 stops
1:30 pm - 5:40 amUSM-IAD
51h 10m3 stops
$2,696Singapore Airlines
Find Deal
Thu, Aug 1 - Sat, Aug 17
10:55 am - 9:20 amIAD-USM
35h 25m2 stops
10:05 am - 8:45 amUSM-IAD
33h 40m2 stops
$4,937Qatar Airways
Find Deal
Mon, Jul 29 - Mon, Aug 19

Good to know

Cheapest flight

$1,331
Flight from Washington Dulles Airport to Koh Samui

When to book flights from Dulles Intl to Koh Samui

Are your dates flexible? Find out the best times to travel from Dulles Intl to Koh Samui 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 Koh Samui flights

  • What is the cheapest flight from Washington, D.C. Dulles Intl Airport to Koh Samui?

    In the last 3 days, the lowest price for a flight from Washington, D.C. Dulles Intl Airport to Koh Samui was $1,331 for a round-trip ticket.

  • Do I need a passport to fly between Washington Dulles Airport and Koh Samui?

    Yes

  • Which airports will I be using when flying from Washington Dulles Airport to Koh Samui?

    Washington Dulles Airport and Koh Samui are both served by 1 main airport. You will leave Washington Dulles Airport from Washington, D.C. Dulles Intl and will be arriving at Ko Samui.

  • Which aircraft models fly most regularly from Washington Dulles Airport to Koh Samui?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from Washington Dulles Airport to Koh Samui?

    Star Alliance, and oneworld are the airline alliances operating flights between Washington Dulles Airport and Koh Samui, with Star Alliance being the most commonly used for this route.

  • How does KAYAK find such low prices on flights from Washington Dulles Airport to Koh Samui?

    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 Koh Samui.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Koh Samui 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 Koh Samui?

    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 Koh Samui with an airline and back to Washington Dulles Airport with another airline. Booking your flights between Washington Dulles Airport and USM 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 Koh Samui?

    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 Koh Samui from Washington Dulles Airport up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

See more FAQs

Top airline flying from Dulles Intl to Koh Samui

 
See real verified KAYAK customer reviews for airlines flying from Washington, D.C. to Koh Samui. 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 Koh Samui? 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.
7.7
Qatar AirwaysOverall score based on 4430 reviews
7.7Comfort
7.8Boarding
7.5Food
8.2Crew
7.7Entertainment
Airline reviews

Operated by American Airlines. Very chaotic and the crew was bit rough responding any enquiries. Restricted leg space.. Qatar would have been better

6.0 GoodAnonymous, Apr 2024PHL - DOH
Read more about Qatar Airways reviews

Operated by American Airlines. Very chaotic and the crew was bit rough responding any enquiries. Restricted leg space.. Qatar would have been better

Qatar airways from Doha to guangzhau was excellent big bird Boeing 777 more room and smoothly flight, I Love it

It was good no problems made it on time for the next flight overseas!

The made us waiting and held our passports and boarding pass making us miss our flights

Not impressed. Only allowed one carry on on such a long flight.

The flight was good but my neighbor had the vent open full power for the whole flight and because the air was blowing from the side instead of from the top and I got very cold and ended up with a sore throat.

Bad experience with the delay n long wait time for connecting flight after missing the connection flight from Doha.

Wore experience due to delay and took me 3 days to reach my destination.

All over with Qatar airlines my experience was really bad due to delays and then putting me on different airlines and after 8 hours of wait I had to listen to their is no plane to fly for another 24 hours. Wore experience ever.

Excellent will be flying again in May with Qatar. to Botswana.

Washington Dulles Airport - Koh Samui Flights

Departure:

Washington Dulles Airport (IAD)United States

Destination:

Koh Samui (USM)Thailand

Cabin classes:

Browse origins:

Browse destinations: