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 $708 for a one-way ticket and $1,252 for a round-trip. Visit our flight page for the latest deals!>/a>

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

Yes Visit our flight page for the latest deals!>/a>

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. Visit our flight page for the latest deals!>/a>

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

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

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

oneworld, and Star Alliance are the airline alliances operating flights between Washington, D.C. and Ko 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 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. Visit our flight page for the latest deals!>/a>

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. Visit our flight page for the latest deals!>/a>

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. Visit our flight page for the latest deals!>/a>

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. Visit our flight page for the latest deals!>/a>

Which airlines provide the cheapest flights from Washington, D.C. to Ko Samui?

In the past 3 days, the cheapest round-trip tickets from Washington, D.C. to Ko Samui were found on Turkish Airlines ($1,252) and Cathay Pacific ($1,789).

$708 CHEAP FLIGHTS from Washington, D.C. to Ko Samui (WAS - USM)

WAS - USM

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Flights Deals

Cheap Flights from Washington, D.C. to Ko Samui

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.

Round-trip

One-way

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

KAYAK's recommended round-trip deals from the most popular airlines that fly from Washington, D.C. to Ko Samui.

Discover the best prices for you by selecting your travel dates on KAYAK.

9:40 pm - 8:35 amIAD-USM

23h 55m2 stops

2:05 pm - 12:15 pmUSM-IAD

33h 10m2 stops

$1,252Turkish Airlines

Find Deal

Wed, Oct 1 - Fri, Oct 31

9:40 pm - 11:40 amIAD-USM

27h 00m2 stops

4:25 pm - 11:45 amUSM-IAD

30h 20m2 stops

$1,412

Find Deal

Sun, Aug 24 - Sun, Aug 31

9:40 pm - 9:10 pmIAD-USM

36h 30m2 stops

8:20 am - 7:45 pmUSM-IAD

46h 25m2 stops

$1,436Turkish Airlines

Find Deal

Sun, Aug 10 - Sat, Aug 23

10:55 am - 2:45 pmIAD-USM

40h 50m2 stops

7:10 pm - 8:05 pmUSM-IAD

35h 55m3 stops

$1,538

Find Deal

Wed, Oct 1 - Fri, Oct 31

6:30 am - 6:35 pmDCA-USM

49h 05m2 stops

10:55 am - 8:16 pmUSM-DCA

44h 21m2 stops

$1,789Cathay Pacific

Find Deal

Sun, Aug 24 - Sun, Aug 31

7:28 pm - 6:15 pmBWI-USM

35h 47m2 stops

1:25 pm - 4:47 pmUSM-BWI

38h 22m2 stops

$1,908Singapore Airlines

Find Deal

Wed, Oct 1 - Fri, Oct 31

8:59 am - 6:15 pmDCA-USM

46h 16m3 stops

1:25 pm - 8:55 pmUSM-DCA

42h 30m2 stops

$1,945Singapore Airlines

Find Deal

Wed, Oct 1 - Fri, Oct 31

6:35 am - 9:35 pmDCA-USM

28h 00m3 stops

10:55 am - 10:43 amUSM-DCA

34h 48m2 stops

$1,987Cathay Pacific

Find Deal

Tue, Jun 3 - Wed, Jun 11

9:20 pm - 6:15 pmBWI-USM

33h 55m2 stops

4:25 pm - 7:35 pmUSM-BWI

38h 10m2 stops

$2,688British Airways

Find Deal

Sun, Aug 24 - Sun, Aug 31

9:20 pm - 9:10 pmBWI-USM

36h 50m2 stops

1:30 pm - 7:35 pmUSM-BWI

41h 05m2 stops

$2,814British Airways

Find Deal

Fri, Jun 13 - Fri, Jun 20

Expert advice

Expert advice for your flight from Washington, D.C. to Ko Samui

Snippets provided in this section are AI-generated based on a summarization of KAYAK-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.

KAYAK teamed up with top travel experts to share the best tips for your journey.

Airlines

American Airlines

Consider Main Cabin Extra for early boarding and complimentary drinks on long flights.

Download the American Airlines app for access to inflight entertainment on long flights.

Read more about American Airlinesby Harriet Baskas

Southwest

Southwest offers two free checked bags, ideal for travelers with lots of luggage.

Use EarlyBird Check-In for a better boarding position, avoiding middle seats.

Read more about Southwestby Blane Bachelor

United Airlines

United's Polaris Lounge offers a luxurious experience with seated meals for premium passengers.

United Polaris offers lie-flat seats on long-haul flights for enhanced comfort.

Read more about United Airlinesby Stefanie Waldek

Our travel experts

Harriet Baskas

Expert on American Airlines

Blane Bachelor

Expert on Southwest

Stefanie Waldek

Expert on United Airlines

Useful Info

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.

Prices

Airlines

What’s the cheapest day of the week to fly from Washington, D.C. to Ko Samui?

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.

Find deals

Cheapest flight	$708

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.

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 $708 for a one-way ticket and $1,252 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.
Which airline alliances offer flights from Washington, D.C. to Ko Samui?
oneworld, and Star Alliance are the airline alliances operating flights between Washington, D.C. and Ko 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 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.

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.

7.3

Turkish AirlinesOverall score based on 3790 reviews

7.3Comfort

7.3Boarding

7.4Entertainment

7.3Food

7.7Crew

Airline reviews

Very punctual, the onboard staff was friendly and correct, the flight was fortunately very calm, the toilets were clean, in short, an excellent experience Thanks

10.0 ExcellentMaria Cristina, Apr 2025MIA - IST

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

Airports

Cabin class

Complete your trip

Direct Flights

Flights to other cities

Origins

Other airports

Information on your arrival and departure airports

Ko Samui (USM)

WAS - USM

$708 Find Cheap Flights from Washington, D.C. to Ko Samui

KAYAK searches hundreds of travel sites at once for deals on flights to Ko Samui

Cheap Flights from Washington, D.C. to Ko Samui

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

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

Expert advice for your flight from Washington, D.C. to Ko Samui

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?

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.

Which airlines provide the cheapest flights from Washington, D.C. to Ko Samui?

In the past 3 days, the cheapest round-trip tickets from Washington, D.C. to Ko Samui were found on Turkish Airlines ($1,252) and Cathay Pacific ($1,789).

Good to know

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

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 $708 for a one-way ticket and $1,252 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.

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

oneworld, and Star Alliance are the airline alliances operating flights between Washington, D.C. and Ko 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 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.

Top airline flying from Washington, D.C. to Ko Samui

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

Information on your arrival and departure airports

Cabin class types available on flights from Washington, D.C. to Ko Samui

Complete your trip to Ko Samui with a hotel stay or car rental

Find direct flights to and from Washington, D.C. and Ko Samui

Flights to other popular destinations

Flights from domestic origins to Ko Samui

Choose which airport to fly into in Ko Samui