Find flights
Deals
When to book
FAQs & Tips

WAS - USM

$1,316 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 8/22. 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
Mon 6/17
Mon 6/24

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 42,332,103 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)

 
These are the cheapest deals for flights from Washington, D.C. to Koh Samui currently on KAYAK along with options from the most popular airlines KAYAK users selected for this route. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.

Recent round-trip flight deals from Washington, D.C. to Koh Samui

Recommended round-trip deals departing in the coming months from the most popular airlines that fly from Washington, D.C. to Koh Samui.

Recent one-way flight deals from Washington, D.C. to Koh Samui

Only flying one-way? Below are some of the best one-way flight deals from Washington, D.C. to Koh Samui found on KAYAK recently.

Recent last minute flight deals from Washington, D.C. to Koh Samui

Leaving soon but still want a bargain? Check out these latest deals for last minute flights from Washington, D.C. to Koh Samui.

Recent direct flight deals from Washington, D.C. to Koh Samui

The latest deals for direct flights from Washington, D.C. to Koh Samui so you can sit back and relax without the need for a layover.

Cheap bus & train deals from Washington, D.C. to Koh Samui

Find recent round-trip train or bus tickets from Washington, D.C. to Koh Samui.

All round-trip flight deals to Koh Samui

The cheapest plane tickets to Koh Samui found on KAYAK recently.
Discover the best prices and deals for you by selecting your travel dates.
Choose your dates
9:50 pm - 2:45 pmIAD-USM
29h 55m2 stops
1:30 pm - 2:45 pmUSM-IAD
60h 15m2 stops
$1,316
Find Deal
Thu, Aug 22 - Wed, Aug 28
10:25 pm - 12:35 pmIAD-USM
26h 10m2 stops
5:05 pm - 11:00 amUSM-IAD
53h 55m2 stops
$1,350
Find Deal
Wed, Nov 13 - Tue, Nov 19
9:50 pm - 10:30 amIAD-USM
49h 40m2 stops
4:25 pm - 2:45 pmUSM-IAD
33h 20m2 stops
$1,550Turkish Airlines
Find Deal
Mon, Jun 3 - Tue, Jul 2
4:40 pm - 6:20 pmIAD-USM
62h 40m2 stops
4:25 pm - 7:55 pmUSM-IAD
62h 30m2 stops
$1,601Turkish Airlines
Find Deal
Mon, Jun 24 - Sat, Jun 29
5:38 pm - 6:20 pmIAD-USM
61h 42m3 stops
1:30 pm - 4:33 pmUSM-IAD
38h 03m2 stops
$2,171Singapore Airlines
Find Deal
Thu, Aug 22 - Wed, Aug 28
9:20 am - 6:20 pmDCA-USM
46h 00m2 stops
1:30 pm - 8:59 pmUSM-DCA
42h 29m2 stops
$2,300Singapore Airlines
Find Deal
Thu, Aug 22 - Wed, Aug 28
7:45 pm - 6:35 pmDCA-USM
35h 50m2 stops
10:55 am - 4:24 pmUSM-DCA
40h 29m2 stops
$2,613Cathay Pacific
Find Deal
Mon, Jun 3 - Tue, Jul 2
9:20 pm - 9:15 pmBWI-USM
36h 55m2 stops
1:30 pm - 7:35 pmUSM-BWI
41h 05m2 stops
$2,778British Airways
Find Deal
Mon, Jun 3 - Tue, Jul 2
9:20 pm - 6:20 pmBWI-USM
34h 00m2 stops
4:25 pm - 7:35 pmUSM-BWI
38h 10m2 stops
$2,784British Airways
Find Deal
Thu, Aug 22 - Wed, Aug 28
7:30 pm - 3:45 pmDCA-USM
33h 15m3 stops
10:55 am - 9:17 amUSM-DCA
33h 22m2 stops
$2,847Cathay Pacific
Find Deal
Mon, Jun 24 - Sat, Jun 29

Good to know

Cheapest flight

$1,316
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 $1,316 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 origins:

Browse destinations: