Which airports can I use when flying from Washington, D.C. to Ko Samui?

Flights from Washington, D.C. to Ko Samui may depart from several airports in Washington, D.C. area, including Washington, D.C. Reagan-National (DCA) and Washington, D.C. Dulles Intl (IAD). Flights usually arrive at Ko Samui (USM).

What cabin classes can I book on flights from Washington, D.C. to Ko Samui?

Only Economy Class is available on flights from Washington, D.C. to Ko Samui.

Can I save money by using flexible dates for flights from Washington, D.C. to Ko Samui?

Yes. Being flexible with your travel dates can save you up to 30% on the Washington, D.C. to Ko Samui route. Tuesday is the cheapest departure day at $1,150 round-trip on average, while Thursday is the most expensive at $1,636, a difference of $486. KAYAK's flexible dates feature shows options up to 3 days before and after your selected dates, making it easier to compare nearby fares.

What popular places can I visit in Ko Samui?

Some of the most popular sights in Ko Samui are Lamai Beach, Chaweng Beach and Fishermans Village. These are among the most viewed places in Ko Samui on KAYAK.

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

Yes, a valid passport is required for this international route. Many destinations require at least six months of validity beyond your travel dates. Check your passport expiry well before booking.

How are flight prices from Washington, D.C. to Ko Samui looking right now?

One-way fares from Washington, D.C. to Ko Samui are currently in line with typical prices for this route. Average one-way fares are about $698.

What is the time difference between Washington, D.C. and Ko Samui?

Ko Samui is 11 hours ahead of Washington, D.C. (Indochina Time vs Eastern Time). Plan for the time shift when scheduling connections or first-day activities.

What car rental options are available at Ko Samui Airport (USM)?

Ko Samui Airport (USM) hosts 5 major car rental companies, with daily rates starting from around $14 for economy cars. Top options include: · Drive Car Rental · Alamo · Sixt · Enterprise Rent-A-Car · Hertz

How much should I expect to pay for a Washington, D.C. to Ko Samui flight?

Round-trip flights from Washington, D.C. to Ko Samui range from $1,247 to $1,650, with an average of $1,544 over the past 12 months. Anything below $1,247 counts as a good deal.

What is the cheapest airline to fly from Washington, D.C. to Ko Samui?

Etihad Airways ($1,164) and Cathay Pacific ($1,298) are the cheapest airlines to fly round-trip from Washington, D.C. to Ko Samui according to KAYAK data over the last 5 days.

$564 CHEAP FLIGHTS from Washington, D.C. to Ko Samui (WAS - USM)

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Cheapest round-trip

$1,086

Typical prices: $1,247-$1,650

Multiple Airlines

Sat 9/1Sat 9/15

IAD - USM • 2 stops

Cheapest one-way

$606

Typical prices: $710-$710

Multiple Airlines

Thu 9/20

DCA - USM • 3 stops

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We hope you love your trip to Ko Samui!

Flight Deals

Cheap Flights from Washington, D.C. to Ko Samui (WAS-USM)

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

Round-trip

One-way

Last minute

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

Tue, Sep 1 - Tue, Sep 15

3:10 pm - 7:30 amIAD Washington, D.C. Dulles Intl-USM Ko Samui

29h 20m2 stops Abu Dhabi Zayed Intl Bangkok Suvarnabhumi

9:15 am - 9:45 amUSM Ko Samui-IAD Washington, D.C. Dulles Intl

35h 30m2 stops Phuket City Abu Dhabi Zayed Intl

$1,086Multiple Airlines

Tue, Sep 1 - Tue, Sep 15

3:10 pm - 7:30 amIAD Washington, D.C. Dulles Intl-USM Ko Samui

29h 20m2 stops Abu Dhabi Zayed Intl Bangkok Suvarnabhumi

7:00 pm - 9:45 amUSM Ko Samui-IAD Washington, D.C. Dulles Intl

49h 45m2 stops Phuket City Abu Dhabi Zayed Intl

$1,114Multiple Airlines

Thu, Oct 1 - Thu, Oct 8

11:05 am - 7:10 amIAD Washington, D.C. Dulles Intl-USM Ko Samui

33h 05m2 stops Doha Hamad Intl Bangkok Suvarnabhumi

6:00 am - 3:40 pmUSM Ko Samui-IAD Washington, D.C. Dulles Intl

44h 40m2 stops Bangkok Suvarnabhumi Doha Hamad Intl

$1,117Multiple Airlines

Tue, Sep 1 - Tue, Sep 15

3:10 pm - 7:30 amIAD Washington, D.C. Dulles Intl-USM Ko Samui

29h 20m2 stops Abu Dhabi Zayed Intl Bangkok Suvarnabhumi

8:00 am - 9:45 amUSM Ko Samui-IAD Washington, D.C. Dulles Intl

36h 45m2 stops Phuket City Abu Dhabi Zayed Intl

$1,164Etihad Airways

Wed, Sep 16 - Sun, Sep 20

3:57 pm - 7:40 pmBWI Baltimore/Washington-USM Ko Samui

40h 43m2 stops Dallas/Fort Worth Hong Kong Intl

11:55 am - 9:56 pmUSM Ko Samui-BWI Baltimore/Washington

45h 01m2 stops Hong Kong Intl Chicago O'Hare Intl

$1,298Cathay Pacific

Mon, Sep 14 - Thu, Sep 17

9:40 pm - 8:25 pmIAD Washington, D.C. Dulles Intl-USM Ko Samui

35h 45m2 stops Istanbul Phuket City

6:25 pm - 11:30 amUSM Ko Samui-IAD Washington, D.C. Dulles Intl

28h 05m2 stops Bangkok Suvarnabhumi Istanbul

$1,339Turkish Airlines

Wed, Sep 16 - Sun, Sep 20

3:57 pm - 7:40 pmBWI Baltimore/Washington-USM Ko Samui

40h 43m2 stops Dallas/Fort Worth Hong Kong Intl

11:55 am - 9:56 pmUSM Ko Samui-BWI Baltimore/Washington

45h 01m2 stops Hong Kong Intl Chicago O'Hare Intl

$1,344Cathay Pacific

Mon, Sep 14 - Thu, Sep 17

9:40 pm - 3:10 pmIAD Washington, D.C. Dulles Intl-USM Ko Samui

30h 30m2 stops Istanbul Bangkok Suvarnabhumi

5:35 pm - 11:30 amUSM Ko Samui-IAD Washington, D.C. Dulles Intl

28h 55m2 stops Bangkok Suvarnabhumi Istanbul

$1,392Turkish Airlines

Wed, Sep 30 - Thu, Oct 8

1:15 am - 3:10 pmIAD Washington, D.C. Dulles Intl-USM Ko Samui

26h 55m2 stops Taipei City Taiwan Taoyuan Intl Bangkok Suvarnabhumi

2:00 pm - 5:40 amUSM Ko Samui-IAD Washington, D.C. Dulles Intl

26h 40m3 stops Bangkok Suvarnabhumi Taipei City Taiwan Taoyuan Intl Seattle/Tacoma Intl

$1,417Multiple Airlines

Mon, Sep 14 - Thu, Sep 17

10:55 am - 3:45 pmIAD Washington, D.C. Dulles Intl-USM Ko Samui

41h 50m2 stops Dubai Intl Bangkok Suvarnabhumi

7:00 pm - 8:50 amUSM Ko Samui-IAD Washington, D.C. Dulles Intl

48h 50m2 stops Phuket City Dubai Intl

$1,457Emirates

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

Sat, Aug 22 - Mon, Aug 31

1:50 am - 7:00 pmIAD Washington, D.C. Dulles Intl-USM Ko Samui

30h 10m2 stops Taipei City Taiwan Taoyuan Intl Bangkok Suvarnabhumi

8:10 am - 10:30 pmUSM Ko Samui-IAD Washington, D.C. Dulles Intl

25h 20m2 stops Bangkok Suvarnabhumi Taipei City Taiwan Taoyuan Intl

$1,381EVA Air

Mon, Aug 24 - Mon, Aug 31

1:50 am - 3:35 pmIAD Washington, D.C. Dulles Intl-USM Ko Samui

26h 45m2 stops Taipei City Taiwan Taoyuan Intl Bangkok Suvarnabhumi

8:20 am - 10:30 pmUSM Ko Samui-IAD Washington, D.C. Dulles Intl

25h 10m2 stops Bangkok Suvarnabhumi Taipei City Taiwan Taoyuan Intl

$1,433Multiple Airlines

Fri, Aug 21 - Mon, Aug 31

1:50 am - 5:05 pmIAD Washington, D.C. Dulles Intl-USM Ko Samui

28h 15m2 stops Taipei City Taiwan Taoyuan Intl Bangkok Suvarnabhumi

8:30 am - 10:30 pmUSM Ko Samui-IAD Washington, D.C. Dulles Intl

25h 00m2 stops Bangkok Suvarnabhumi Taipei City Taiwan Taoyuan Intl

$1,555EVA Air

Mon, Aug 24 - Mon, Aug 31

9:00 pm - 9:20 amIAD Washington, D.C. Dulles Intl-USM Ko Samui

25h 20m2 stops Doha Hamad Intl Bangkok Suvarnabhumi

3:50 pm - 8:45 amUSM Ko Samui-IAD Washington, D.C. Dulles Intl

27h 55m2 stops Bangkok Suvarnabhumi Doha Hamad Intl

$1,638Multiple Airlines

Mon, Aug 24 - Mon, Aug 31

6:59 pm - 7:40 pmDCA Washington, D.C. Reagan-National-USM Ko Samui

37h 41m2 stops San Francisco Hong Kong Intl

11:55 am - 8:00 pmUSM Ko Samui-DCA Washington, D.C. Reagan-National

43h 05m2 stops Hong Kong Intl Los Angeles

$1,789Multiple Airlines

Wed, Aug 26 - Mon, Aug 31

9:00 pm - 6:00 pmIAD Washington, D.C. Dulles Intl-USM Ko Samui

34h 00m2 stops Doha Hamad Intl Phuket City

3:50 pm - 8:45 amUSM Ko Samui-IAD Washington, D.C. Dulles Intl

27h 55m2 stops Bangkok Suvarnabhumi Doha Hamad Intl

$1,793Qatar Airways

Mon, Aug 24 - Mon, Aug 31

9:20 pm - 2:45 pmIAD Washington, D.C. Dulles Intl-USM Ko Samui

30h 25m3 stops Lome Addis Ababa Bole Bangkok Suvarnabhumi

9:25 pm - 8:55 amUSM Ko Samui-IAD Washington, D.C. Dulles Intl

46h 30m3 stops Bangkok Suvarnabhumi Addis Ababa Bole Rome Fiumicino

$2,086Multiple Airlines

Mon, Aug 24 - Mon, Aug 31

6:52 pm - 6:15 pmBWI Baltimore/Washington-USM Ko Samui

36h 23m2 stops San Francisco Singapore Changi

1:30 pm - 11:45 amUSM Ko Samui-BWI Baltimore/Washington

33h 15m2 stops Singapore Changi San Francisco

$2,236Multiple Airlines

Mon, Aug 24 - Mon, Aug 31

10:55 am - 2:45 pmIAD Washington, D.C. Dulles Intl-USM Ko Samui

40h 50m2 stops Addis Ababa Bole Bangkok Suvarnabhumi

7:50 pm - 8:55 amUSM Ko Samui-IAD Washington, D.C. Dulles Intl

48h 05m3 stops Bangkok Suvarnabhumi Addis Ababa Bole Rome Fiumicino

$2,238Multiple Airlines

Sun, Aug 23 - Mon, Aug 31

6:52 pm - 6:15 pmBWI Baltimore/Washington-USM Ko Samui

36h 23m2 stops San Francisco Singapore Changi

1:30 pm - 7:15 amUSM Ko Samui-BWI Baltimore/Washington

28h 45m2 stops Singapore Changi San Francisco

$2,276Multiple Airlines

Booking Insights

Price, demand and travel trends for Washington, D.C. to Ko Samui flights

Use KAYAK data on prices, travel dates, airlines and seasonal trends to compare options and book flights from Washington, D.C. to Ko Samui with more confidence.

Prices

Airlines

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

There's little price difference between Washington, D.C. to Ko Samui routes. They average around $1,544 round-trip, based on KAYAK data over the past 12 months.

Find deals

Cheapest flight	$606

Flight from Washington, D.C. Reagan-National 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.

Which airports can I use when flying from Washington, D.C. to Ko Samui?
Flights from Washington, D.C. to Ko Samui may depart from several airports in Washington, D.C. area, including Washington, D.C. Reagan-National (DCA) and Washington, D.C. Dulles Intl (IAD). Flights usually arrive at Ko Samui (USM).
What cabin classes can I book on flights from Washington, D.C. to Ko Samui?
Only Economy Class is available on flights from Washington, D.C. to Ko Samui.
Can I save money by using flexible dates for flights from Washington, D.C. to Ko Samui?
Yes. Being flexible with your travel dates can save you up to 30% on the Washington, D.C. to Ko Samui route. Tuesday is the cheapest departure day at $1,150 round-trip on average, while Thursday is the most expensive at $1,636, a difference of $486. KAYAK's flexible dates feature shows options up to 3 days before and after your selected dates, making it easier to compare nearby fares.
What popular places can I visit in Ko Samui?
Some of the most popular sights in Ko Samui are Lamai Beach, Chaweng Beach and Fishermans Village. These are among the most viewed places in Ko Samui on KAYAK.
Do I need a passport to fly from Washington, D.C. to Ko Samui?
Yes, a valid passport is required for this international route. Many destinations require at least six months of validity beyond your travel dates. Check your passport expiry well before booking.
How are flight prices from Washington, D.C. to Ko Samui looking right now?
One-way fares from Washington, D.C. to Ko Samui are currently in line with typical prices for this route. Average one-way fares are about $698.
What is the time difference between Washington, D.C. and Ko Samui?
Ko Samui is 11 hours ahead of Washington, D.C. (Indochina Time vs Eastern Time). Plan for the time shift when scheduling connections or first-day activities.
What car rental options are available at Ko Samui Airport (USM)?
Ko Samui Airport (USM) hosts 5 major car rental companies, with daily rates starting from around $14 for economy cars. Top options include:
· Drive Car Rental
· Alamo
· Sixt
· Enterprise Rent-A-Car
· Hertz
How much should I expect to pay for a Washington, D.C. to Ko Samui flight?
Round-trip flights from Washington, D.C. to Ko Samui range from $1,247 to $1,650, with an average of $1,544 over the past 12 months. Anything below $1,247 counts as a good deal.

If your dates can be flexible, aim for a Tuesday departure instead of Thursday. On this route, Tuesday flights average $1,150 - about $486 less than Thursday (30% savings) based on the last 12 months.
If you're arriving late at night and need somewhere to stay, check out these hotels close to Ko Samui Airport.
- Melia Koh Samui
- Ozo Chaweng Samui - Sha Extra Plus
- Amari Koh Samui

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

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Ko Samui (USM)

WAS - USM

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Everything you should know

Cheap Flights from Washington, D.C. to Ko Samui (WAS-USM)

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

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

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

Price, demand and travel trends for Washington, D.C. to Ko Samui flights

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

What is the cheapest airline to fly from Washington, D.C. to Ko Samui?

Key details for Washington, D.C. to Ko Samui flights

Cheapest flight

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

Your Washington, D.C. to Ko Samui flight questions, answered

Your guide to booking Washington, D.C. to Ko Samui flights

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