Find flights
Deals
When to book
FAQs & Tips

WAS - USM

$1,377 Find cheap flights from Washington, D.C. to Koh Samui

This is the cheapest round-trip flight price found by a KAYAK user in the last 72 hours by searching for a flight from Washington, D.C. to Koh Samui departing on 5/25. 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
Fri 6/7
Fri 6/14

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 43,968,530 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 Washington, D.C. to Koh Samui (WAS-USM)

Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Washington, D.C. 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 - 6:00 pmIAD-USM
38h 20m2 stops
6:25 pm - 2:45 pmUSM-IAD
31h 20m2 stops
$1,377Turkish Airlines
Find Deal
Sat, May 25 - Mon, Jun 10
9:50 pm - 6:20 pmIAD-USM
33h 30m2 stops
9:10 pm - 7:55 pmUSM-IAD
33h 45m2 stops
$1,380Turkish Airlines
Find Deal
Thu, May 23 - Mon, Jun 10
10:00 pm - 11:40 amIAD-USM
26h 40m2 stops
7:10 pm - 4:40 pmUSM-IAD
32h 30m2 stops
$1,748Etihad Airways
Find Deal
Fri, May 24 - Mon, Jun 10
10:55 am - 10:10 amIAD-USM
36h 15m2 stops
9:10 pm - 4:10 pmUSM-IAD
30h 00m2 stops
$1,756Qatar Airways
Find Deal
Fri, May 24 - Mon, Jun 10
8:30 pm - 8:35 amBWI-USM
25h 05m3 stops
8:55 am - 6:50 amUSM-BWI
32h 55m3 stops
$1,919
Find Deal
Thu, Aug 22 - Thu, Aug 29
10:00 pm - 11:40 amIAD-USM
26h 40m2 stops
7:10 pm - 1:30 pmUSM-IAD
29h 20m3 stops
$1,938
Find Deal
Thu, May 23 - Mon, Jun 10
11:58 am - 6:35 pmBWI-USM
43h 37m2 stops
10:55 am - 9:38 pmUSM-BWI
45h 43m2 stops
$1,943Cathay Pacific
Find Deal
Thu, Aug 22 - Thu, Aug 29
6:50 pm - 8:35 amBWI-USM
26h 45m3 stops
7:00 am - 4:31 pmUSM-BWI
44h 31m3 stops
$1,971
Find Deal
Sat, May 25 - Mon, Jun 10
10:14 pm - 7:20 amDCA-USM
46h 06m3 stops
3:50 pm - 6:45 pmUSM-DCA
37h 55m3 stops
$2,277Qatar Airways
Find Deal
Sat, May 25 - Mon, Jun 10
11:49 am - 8:55 pmDCA-USM
46h 06m3 stops
3:20 pm - 9:17 amUSM-DCA
28h 57m3 stops
$2,344Cathay Pacific
Find Deal
Fri, May 24 - Mon, Jun 10

Good to know

Cheapest flight

$1,377
Flight from Washington Dulles Airport to Koh Samui

When to book flights from Washington, D.C. to Koh Samui

Are your dates flexible? Find out the best times to travel from Washington, D.C. 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 flights from Washington, D.C. to Koh Samui

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

    In the last 3 days, the lowest price for a flight from Washington, D.C. to Koh Samui was $1,377 for a round-trip ticket.

  • Do I need a passport to fly between Washington, D.C. and Koh Samui?

    Yes

  • Which airports will I be using when flying from Washington, D.C. to Koh Samui?

    On your way to Koh Samui, you’ll fly out from one of these Washington, D.C. airports: Washington, D.C. Reagan-National or Washington, D.C. Dulles Intl. You’ll be landing at Ko Samui.

  • Which aircraft models fly most regularly from Washington, D.C. to Koh Samui?

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

  • Which airline alliances offer flights from Washington, D.C. to Koh Samui?

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

  • How does KAYAK find such low prices on flights from Washington, D.C. 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, D.C. to Koh Samui.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Washington, D.C. 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, D.C. 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, D.C. 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, D.C. with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Washington, D.C. 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, D.C. up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

See more FAQs

Flights to Koh Samui

Destination:

Koh Samui (USM)Thailand

Cabin classes:

Browse destinations: