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).

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 ฿38,003 return on average, while Thursday is the most expensive at ฿54,063, a difference of ฿16,060. 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 Chaweng Beach, Lamai Beach, and Hin Ta and Hin Yai Rocks. 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.

Have flight prices from Washington, D.C. to Ko Samui changed much recently?

Yes. Based on fares seen in the past 5 days, return flight prices on this route showed a wide range, from about ฿34,962 to ฿241,326. That means the highest observed fare was about 7x higher than the lowest one.

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 ฿23,935.

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.

Which car hire options are available at Ko Samui Airport (USM)?

Ko Samui Airport (USM) hosts 5 major car hire companies, with daily rates starting from around ฿448 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?

Return flights from Washington, D.C. to Ko Samui range from ฿41,198 to ฿54,536, with an average of ฿51,021 over the past 12 months. Anything below ฿41,198 counts as a good deal.

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

เอทิฮัดแอร์เวย์ (฿39,093) and Qatar Airways (฿40,415) are the cheapest airlines to fly return from Washington, D.C. to Ko Samui according to KAYAK data over the last 5 days.

฿17,878 CHEAP FLIGHTS from Washington, D.C. to Ko Samui (WAS - USM)

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Cheapest return flight

฿34,962

Typical prices: ฿41,198-฿54,536

Multiple Airlines

Fri 19/10Fri 26/10

IAD - USM • 2 stops

Cheapest one-way flight

฿20,026

Typical prices: ฿23,462-฿23,462

เอทิฮัดแอร์เวย์

Fri 26/1

IAD - USM • 2 stops

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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.

Return

One-way

Last minute

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

Mon 19 Oct - Mon 26 Oct

15:10 - 08:15IAD Washington, D.C. Dulles Intl-USM Ko Samui

30h 05m2 stops Abu Dhabi Zayed Intl Bangkok Suvarnabhumi

08:30 - 10:05USM Ko Samui-IAD Washington, D.C. Dulles Intl

36h 35m2 stops Bangkok Suvarnabhumi Abu Dhabi Zayed Intl

฿34,962Multiple Airlines

Mon 19 Oct - Mon 26 Oct

15:10 - 08:15IAD Washington, D.C. Dulles Intl-USM Ko Samui

30h 05m2 stops Abu Dhabi Zayed Intl Bangkok Suvarnabhumi

08:30 - 10:05USM Ko Samui-IAD Washington, D.C. Dulles Intl

36h 35m2 stops Bangkok Suvarnabhumi Abu Dhabi Zayed Intl

฿36,053Multiple Airlines

Mon 26 Oct - Mon 2 Nov

21:05 - 10:40IAD Washington, D.C. Dulles Intl-USM Ko Samui

26h 35m2 stops Doha Hamad Intl Phuket City

21:10 - 15:55USM Ko Samui-IAD Washington, D.C. Dulles Intl

30h 45m2 stops Bangkok Suvarnabhumi Doha Hamad Intl

฿37,804Multiple Airlines

Tue 10 Nov - Wed 18 Nov

14:35 - 10:40IAD Washington, D.C. Dulles Intl-USM Ko Samui

32h 05m2 stops Abu Dhabi Zayed Intl Phuket City

15:50 - 09:05USM Ko Samui-IAD Washington, D.C. Dulles Intl

29h 15m2 stops Phuket City Abu Dhabi Zayed Intl

฿37,837Multiple Airlines

Sun 11 Oct - Sun 18 Oct

15:10 - 07:10IAD Washington, D.C. Dulles Intl-USM Ko Samui

29h 00m2 stops Abu Dhabi Zayed Intl Bangkok Suvarnabhumi

19:00 - 09:45USM Ko Samui-IAD Washington, D.C. Dulles Intl

49h 45m2 stops Phuket City Abu Dhabi Zayed Intl

฿38,366Multiple Airlines

Mon 1 Feb - Tue 9 Feb

20:05 - 13:05IAD Washington, D.C. Dulles Intl-USM Ko Samui

29h 00m2 stops Doha Hamad Intl Bangkok Suvarnabhumi

15:35 - 08:30USM Ko Samui-IAD Washington, D.C. Dulles Intl

28h 55m2 stops Bangkok Suvarnabhumi Doha Hamad Intl

฿39,060Multiple Airlines

Thu 15 Oct - Mon 23 Nov

15:10 - 15:25IAD Washington, D.C. Dulles Intl-USM Ko Samui

37h 15m2 stops Abu Dhabi Zayed Intl Bangkok Suvarnabhumi

21:10 - 09:05USM Ko Samui-IAD Washington, D.C. Dulles Intl

47h 55m2 stops Bangkok Suvarnabhumi Abu Dhabi Zayed Intl

฿39,093เอทิฮัดแอร์เวย์

Thu 15 Oct - Mon 23 Nov

11:05 - 11:05IAD Washington, D.C. Dulles Intl-USM Ko Samui

37h 00m2 stops Doha Hamad Intl Bangkok Suvarnabhumi

19:10 - 15:55USM Ko Samui-IAD Washington, D.C. Dulles Intl

32h 45m2 stops Bangkok Suvarnabhumi Doha Hamad Intl

฿40,415Qatar Airways

Thu 22 Oct - Mon 26 Oct

15:10 - 08:15IAD Washington, D.C. Dulles Intl-USM Ko Samui

30h 05m2 stops Abu Dhabi Zayed Intl Bangkok Suvarnabhumi

08:30 - 10:05USM Ko Samui-IAD Washington, D.C. Dulles Intl

36h 35m2 stops Bangkok Suvarnabhumi Abu Dhabi Zayed Intl

฿40,944เอทิฮัดแอร์เวย์

Sun 11 Oct - Sun 18 Oct

12:59 - 19:40DCA Washington, D.C. Reagan-National-USM Ko Samui

43h 41m2 stops Chicago O'Hare Intl Hong Kong Intl

11:55 - 19:59USM Ko Samui-DCA Washington, D.C. Reagan-National

43h 04m2 stops Hong Kong Intl Chicago O'Hare Intl

฿49,536Multiple Airlines

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

Thu 17 Sep - Sun 27 Sep

21:00 - 10:45IAD Washington, D.C. Dulles Intl-USM Ko Samui

26h 45m2 stops Doha Hamad Intl Bangkok Suvarnabhumi

19:00 - 15:40USM Ko Samui-IAD Washington, D.C. Dulles Intl

31h 40m2 stops Phuket City Doha Hamad Intl

฿41,175Multiple Airlines

Thu 17 Sep - Sun 27 Sep

21:00 - 10:45IAD Washington, D.C. Dulles Intl-USM Ko Samui

26h 45m2 stops Doha Hamad Intl Bangkok Suvarnabhumi

19:00 - 15:40USM Ko Samui-IAD Washington, D.C. Dulles Intl

31h 40m2 stops Phuket City Doha Hamad Intl

฿41,836Multiple Airlines

Thu 17 Sep - Sun 27 Sep

19:31 - 19:40BWI Baltimore/Washington-USM Ko Samui

37h 09m2 stops Dallas/Fort Worth Hong Kong Intl

11:55 - 21:56USM Ko Samui-BWI Baltimore/Washington

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

฿49,536Multiple Airlines

Thu 17 Sep - Sun 27 Sep

11:31 - 19:40DCA Washington, D.C. Reagan-National-USM Ko Samui

45h 09m2 stops Chicago O'Hare Intl Hong Kong Intl

11:55 - 20:06USM Ko Samui-DCA Washington, D.C. Reagan-National

43h 11m2 stops Hong Kong Intl Chicago O'Hare Intl

฿50,659Cathay Pacific

Thu 17 Sep - Sun 27 Sep

11:31 - 19:40DCA Washington, D.C. Reagan-National-USM Ko Samui

45h 09m2 stops Chicago O'Hare Intl Hong Kong Intl

11:55 - 20:06USM Ko Samui-DCA Washington, D.C. Reagan-National

43h 11m2 stops Hong Kong Intl Chicago O'Hare Intl

฿50,990Cathay Pacific

Thu 17 Sep - Sun 27 Sep

19:31 - 19:40BWI Baltimore/Washington-USM Ko Samui

37h 09m2 stops Dallas/Fort Worth Hong Kong Intl

11:55 - 21:56USM Ko Samui-BWI Baltimore/Washington

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

฿51,056Multiple Airlines

Thu 17 Sep - Sun 27 Sep

11:23 - 19:40BWI Baltimore/Washington-USM Ko Samui

45h 17m2 stops Chicago O'Hare Intl Hong Kong Intl

11:55 - 21:56USM Ko Samui-BWI Baltimore/Washington

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

฿52,543Multiple Airlines

Thu 17 Sep - Sun 27 Sep

06:30 - 19:40DCA Washington, D.C. Reagan-National-USM Ko Samui

50h 10m2 stops New York John F Kennedy Intl Hong Kong Intl

11:55 - 20:06USM Ko Samui-DCA Washington, D.C. Reagan-National

43h 11m2 stops Hong Kong Intl Chicago O'Hare Intl

฿52,576Multiple Airlines

Thu 17 Sep - Sun 27 Sep

11:23 - 19:40BWI Baltimore/Washington-USM Ko Samui

45h 17m2 stops Chicago O'Hare Intl Hong Kong Intl

11:55 - 21:56USM Ko Samui-BWI Baltimore/Washington

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

฿52,675Cathay Pacific

Thu 17 Sep - Sun 27 Sep

17:35 - 19:40DCA Washington, D.C. Reagan-National-USM Ko Samui

39h 05m2 stops Los Angeles Hong Kong Intl

11:55 - 22:00USM Ko Samui-DCA Washington, D.C. Reagan-National

45h 05m2 stops Hong Kong Intl Chicago O'Hare Intl

฿52,939Multiple 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 ฿51,021 return, based on KAYAK data over the past 12 months.

Find deals

Cheapest flight	฿20,026

Flights from Washington, D.C. Dulles Intl 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 return price

KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or returns 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).
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 ฿38,003 return on average, while Thursday is the most expensive at ฿54,063, a difference of ฿16,060. 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 Chaweng Beach, Lamai Beach, and Hin Ta and Hin Yai Rocks. 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.
Have flight prices from Washington, D.C. to Ko Samui changed much recently?
Yes. Based on fares seen in the past 5 days, return flight prices on this route showed a wide range, from about ฿34,962 to ฿241,326. That means the highest observed fare was about 7x higher than the lowest one.
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 ฿23,935.
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.
Which car hire options are available at Ko Samui Airport (USM)?
Ko Samui Airport (USM) hosts 5 major car hire companies, with daily rates starting from around ฿448 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?
Return flights from Washington, D.C. to Ko Samui range from ฿41,198 to ฿54,536, with an average of ฿51,021 over the past 12 months. Anything below ฿41,198 counts as a good deal.

If your dates are flexible, aim for a Tuesday departure instead of Thursday. On this route, Tuesday flights average ฿38,003 – about ฿16,060 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.
- Ozo Chaweng Samui - Sha Extra Plus
- Cosi Samui Chaweng Beach
- Melia Koh Samui

More options for your flight from Washington, D.C. to Ko Samui

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WAS - USM

฿17,878 Find Cheap Flights from Washington, D.C. to Ko Samui – Compare and Save

Everything you should know

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

Recent return 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

More options for your flight from Washington, D.C. to Ko Samui

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

Information on your arrival and departure airports

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

Flights from domestic origins to Ko Samui

Flights to other popular destinations