WAS - USM

$598 Find Cheap Flights from Washington, D.C. to Ko Samui

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Washington, D.C. to Ko Samui departing on 2/1. 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 Ko Samui

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Washington, D.C. to Ko 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 Ko Samui, as well as popular online travel agencies
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Everything you should know

Cheapest round-trip
$1,133
Multiple Airlines
Mon 1/12Mon 1/26
IAD - USM • 2 stops
Cheapest one-way
$598
Multiple Airlines
Sun 2/1
IAD - USM • 2 stops
Top airlines
Turkish Airlines
Cheapest • from $1,517 (round-trip)
Qatar Airways
Best reviews • 7.4 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
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Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Washington, D.C. to Ko 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 Ko 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 for you by selecting your travel dates on KAYAK.

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

Mon, Jan 12 - Mon, Jan 26
Multiple Airlines Logo
2:35 pm - 9:20 pm
IAD
-
USM
42h 45m2 stops
Multiple Airlines Logo
8:50 am - 9:05 am
USM
-
IAD
60h 15m2 stops
$1,133Multiple Airlines
Sun, Feb 1 - Sun, Feb 8
Multiple Airlines Logo
9:15 pm - 8:50 pm
IAD
-
USM
35h 35m2 stops
Multiple Airlines Logo
8:40 pm - 7:20 pm
USM
-
IAD
34h 40m2 stops
$1,255Multiple Airlines
Fri, Jan 30 - Sun, Feb 8
Multiple Airlines Logo
9:15 pm - 6:15 pm
IAD
-
USM
33h 00m2 stops
Multiple Airlines Logo
8:40 pm - 7:20 pm
USM
-
IAD
34h 40m2 stops
$1,306Multiple Airlines
Thu, Jan 8 - Wed, Feb 4
Multiple Airlines Logo
2:35 pm - 7:35 am
IAD
-
USM
53h 00m2 stops
Multiple Airlines Logo
8:50 am - 9:05 am
USM
-
IAD
60h 15m2 stops
$1,309Multiple Airlines
Thu, Jan 8 - Wed, Feb 4
Turkish Airlines Logo
1:30 pm - 1:05 pm
IAD
-
USM
35h 35m2 stops
Turkish Airlines Logo
1:25 pm - 7:20 pm
USM
-
IAD
41h 55m2 stops
$1,517Turkish Airlines
Fri, Jan 16 - Fri, Jan 23
Turkish Airlines Logo
1:30 pm - 6:15 pm
IAD
-
USM
64h 45m2 stops
Turkish Airlines Logo
1:25 pm - 11:45 am
USM
-
IAD
34h 20m2 stops
$1,528Turkish Airlines
Mon, Feb 2 - Mon, Feb 9
Cathay Pacific Logo
6:56 pm - 7:35 pm
DCA
-
USM
60h 39m2 stops
Cathay Pacific Logo
11:40 am - 10:47 pm
USM
-
DCA
47h 07m2 stops
$1,768Cathay Pacific
Fri, Jan 30 - Sun, Feb 8
Cathay Pacific Logo
9:35 am - 7:35 pm
DCA
-
USM
46h 00m2 stops
Cathay Pacific Logo
11:40 am - 6:44 pm
USM
-
DCA
43h 04m2 stops
$1,784Cathay Pacific
Fri, Jan 16 - Fri, Jan 23
Qatar Airways Logo
1:35 pm - 4:40 pm
DCA
-
USM
39h 05m3 stops
Qatar Airways Logo
9:10 pm - 7:08 pm
USM
-
DCA
33h 58m3 stops
$2,067Qatar Airways
Fri, Jan 16 - Fri, Jan 23
Singapore Airlines Logo
6:30 am - 6:15 pm
BWI
-
USM
47h 45m2 stops
Singapore Airlines Logo
1:25 pm - 9:26 pm
USM
-
BWI
44h 01m2 stops
$3,157Singapore Airlines
Booking Insights

KAYAK's insights & trends for Washington, D.C. to Ko Samui flights

Get data-powered insights and trends into flights from Washington, D.C. to Ko Samui 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, D.C. to Ko Samui?

The average price of all round-trip flights from Washington, D.C. to Ko Samui clicked on KAYAK for each day over the last 12 months.

Your flight ticket price will generally be cheaper if you fly to Ko Samui on a Thursday and more expensive on a Saturday. On your return trip to Washington, D.C., you should consider flying back on a Wednesday, and avoid Saturdays for better deals.

Good to know

Cheapest flight$598
Flight from Washington Dulles Airport to Ko Samui

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

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

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

    In the last 3 days, the lowest price for a flight from Washington, D.C. to Ko Samui was $517 for a one-way ticket and $1,133 for a round-trip.

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

    Yes

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

    On your way to Ko 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 Ko Samui?

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

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Ko 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 Ko 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 Ko 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 Ko 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 Ko Samui from Washington, D.C. up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top airline flying from Washington, D.C. to Ko Samui

 
See real verified KAYAK customer reviews for airlines flying from Washington, D.C. to Ko 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 Washington, D.C. to Ko 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.
7.4
Qatar AirwaysOverall score based on 3686 reviews
7.5Boarding
7.9Crew
7.4Entertainment
7.3Food
7.4Comfort
Airline reviews

All good. Over four hours flight if provided snacks like Qatar Airways would be better

8.0 ExcellentAnonymous, Oct 2025
DFW - YYC
Read more Qatar Airways reviews

All good. Over four hours flight if provided snacks like Qatar Airways would be better

Lobster starter in business class was not good, tough, served cold, and without butter. Movie selection was missing latest releases, did not offer older classic, high quality movies

Food was absolutely pathetic. I wasted so much food which I thought was inedible. I also loathe the inflight entertainment system which has very little content

My entire row did not have power for the full duration of a 14.5 hour flight. Could not charge any devices such as laptop or phones for the entirety of the long flight. The flight attendants tried to remedy the issue by resetting the power, but were not successful. The only other solution provided was to move me to another seat on the plane which was in the middle row. I had paid for a “preferred” seat that was a window seat. This was a downgrade being offered due to the power issue.

Nothing to complain. The staff and flight was good especially the seats which was better compared than the cloth ones on Qatar airways

I prebooked a comfort plus seat on this flight and therefore the flight was comfy. I got the correct seat in the correct section of the plane that I have booked, that's this. Flight was comfortable. Staff were average on the flight, appearing to be rushed and short in engagement with travellers, perhaps this to maximise there rest time on the flight.

I was travelling 3.5 years after. Agree Economy is no business class but the food was mediocre. Ordered a Hindu meal, the salads were bitter . The food was really below quality and had no tast from what I had in the past. Indian Railways probably have a better quality food when compared. However the kids meal was really nice and really appreciate how they were taken care of. The restrooms were dirty .

My flight was with American Airlines 120. The flight was delayed 3 hours and I missed my connection. When I arrived in Doha, the AA staff told me to call an 800 number to rebook a different flight, which was unacceptable. Eventually a Qatar Air staff member helped rebook me on a flight to Manila, that was 12 hours later. They offered me a hotel and meal voucher which I declined, because I didn’t want to leave the airport. Long story short, I spent 12 hours in the Doha airport waiting for my next flight.

Overall the experience was neat with crew being nice and caring especially to parent with kids. The free snacks option was okay. The kiosk at Philly airport didn’t work.

Reason for travelling Tampa to Orlando is to fly Qatar Airline. we end up with American Airline. This was the miserable experience I ever had in my entire travel history. Flight attendants were rude. They hit my knee with the food cart and I was holding ice pack for 2 hours. I still have the pain after a week. WE boarded the flight twice because of the temperature inside the plan.

Everything you need to know for your flight from Washington, D.C. to Ko Samui

Information on your arrival and departure airports