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

Flights from Washington, D.C. Dulles Intl Airport to Ko Samui usually depart from Washington, D.C. Dulles Intl (IAD) and arrive at Ko Samui (USM).

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

Yes. Flexible dates can save you up to 30% on flights from Washington, D.C. Dulles Intl Airport to Ko Samui. Tuesday is the cheapest departure day at ฿38,844 return on average, while Thursday is the most expensive at ฿55,260, a difference of ฿16,416. KAYAK's flexible dates feature shows options up to three 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 Bophut Beach. These are among the most viewed places in Ko Samui on KAYAK.

Do I need a passport to fly from Washington, D.C. Dulles Intl Airport 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. Dulles Intl Airport to Ko Samui looking right now?

One-way fares from Washington, D.C. Dulles Intl Airport to Ko Samui are currently higher than usual. Average one-way flight prices are about ฿24,201, which is 6% above the typical average for this route.

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

Ko Samui is 11 hours ahead of Washington, D.C. Dulles Intl Airport (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 rental companies, with daily rates starting from around ฿431 for economy cars. Top options include: • Drive Car Rental • Alamo • Sixt • Enterprise Rent-A-Car • Thai Rent

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

Return flights from Washington, D.C. Dulles Intl Airport to Ko Samui range from ฿41,720 to ฿55,744, with an average of ฿49,347 over the past 12 months. Anything below ฿41,720 counts as a good deal.

Which airline is the cheapest to fly from Washington, D.C. Dulles Intl Airport to Ko Samui?

Cathay Pacific (฿42,458) offered the cheapest return ticket from Washington, D.C. Dulles Intl Airport to Ko Samui in the last 5 days.

฿20,266 CHEAP FLIGHTS from Washington Dulles to Ko Samui (IAD - USM)

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Cheapest return flight

฿36,952

Typical prices: ฿41,720-฿55,744

Multiple Airlines

Wed 24/1Wed 7/2

IAD - USM • 2 stops

Cheapest one-way flight

฿20,266

Typical prices: ฿22,798-฿22,798

Multiple Airlines

Sun 28/1

IAD - USM • 2 stops

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We hope you enjoy your trip to Ko Samui!

Flight Deals

Cheap Flights from Dulles Intl to Ko Samui (IAD-USM)

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

Return

One-way

Last minute

Recent return flight deals from Dulles Intl to Ko Samui

Sun 24 Jan - Sun 7 Feb

14:25 - 07:10IAD Washington, D.C. Dulles Intl-USM Ko Samui

28h 45m2 stops Abu Dhabi Zayed Intl Bangkok Suvarnabhumi

15:35 - 09:00USM Ko Samui-IAD Washington, D.C. Dulles Intl

29h 25m2 stops Bangkok Suvarnabhumi Abu Dhabi Zayed Intl

฿36,952Multiple Airlines

9 hours ago

Sun 24 Jan - Sun 7 Feb

14:25 - 07:10IAD Washington, D.C. Dulles Intl-USM Ko Samui

28h 45m2 stops Abu Dhabi Zayed Intl Bangkok Suvarnabhumi

17:40 - 09:00USM Ko Samui-IAD Washington, D.C. Dulles Intl

27h 20m2 stops Bangkok Suvarnabhumi Abu Dhabi Zayed Intl

฿38,439Multiple Airlines

3+ days ago

Mon 25 Jan - Mon 8 Feb

14:25 - 06:55IAD Washington, D.C. Dulles Intl-USM Ko Samui

28h 30m2 stops Abu Dhabi Zayed Intl Bangkok Suvarnabhumi

15:50 - 09:00USM Ko Samui-IAD Washington, D.C. Dulles Intl

29h 10m2 stops Phuket City Abu Dhabi Zayed Intl

฿38,506Multiple Airlines

9 hours ago

Tue 26 Jan - Tue 9 Feb

14:25 - 11:30IAD Washington, D.C. Dulles Intl-USM Ko Samui

33h 05m2 stops Abu Dhabi Zayed Intl Bangkok Suvarnabhumi

17:40 - 09:00USM Ko Samui-IAD Washington, D.C. Dulles Intl

27h 20m2 stops Bangkok Suvarnabhumi Abu Dhabi Zayed Intl

฿38,574Multiple Airlines

3+ days ago

Tue 26 Jan - Mon 8 Feb

14:25 - 08:10IAD Washington, D.C. Dulles Intl-USM Ko Samui

29h 45m2 stops Abu Dhabi Zayed Intl Bangkok Suvarnabhumi

17:05 - 09:00USM Ko Samui-IAD Washington, D.C. Dulles Intl

27h 55m2 stops Bangkok Suvarnabhumi Abu Dhabi Zayed Intl

฿38,844Multiple Airlines

3 hours ago

Mon 25 Jan - Mon 8 Feb

14:25 - 07:35IAD Washington, D.C. Dulles Intl-USM Ko Samui

29h 10m2 stops Abu Dhabi Zayed Intl Bangkok Suvarnabhumi

17:05 - 09:00USM Ko Samui-IAD Washington, D.C. Dulles Intl

27h 55m2 stops Bangkok Suvarnabhumi Abu Dhabi Zayed Intl

฿39,925Multiple Airlines

3 hours ago

Tue 26 Jan - Tue 9 Feb

14:25 - 07:45IAD Washington, D.C. Dulles Intl-USM Ko Samui

29h 20m2 stops Abu Dhabi Zayed Intl Bangkok Suvarnabhumi

15:35 - 09:00USM Ko Samui-IAD Washington, D.C. Dulles Intl

29h 25m2 stops Bangkok Suvarnabhumi Abu Dhabi Zayed Intl

฿40,026Multiple Airlines

9 hours ago

Sun 24 Jan - Sun 7 Feb

14:25 - 08:25IAD Washington, D.C. Dulles Intl-USM Ko Samui

30h 00m2 stops Abu Dhabi Zayed Intl Phuket City

17:05 - 09:00USM Ko Samui-IAD Washington, D.C. Dulles Intl

27h 55m2 stops Bangkok Suvarnabhumi Abu Dhabi Zayed Intl

฿41,918Multiple Airlines

2 hours ago

Sun 17 Jan - Fri 29 Jan

14:25 - 07:45IAD Washington, D.C. Dulles Intl-USM Ko Samui

29h 20m2 stops Abu Dhabi Zayed Intl Bangkok Suvarnabhumi

11:10 - 09:00USM Ko Samui-IAD Washington, D.C. Dulles Intl

33h 50m2 stops Phuket City Abu Dhabi Zayed Intl

฿42,323Multiple Airlines

7 hours ago

Thu 12 Nov - Mon 16 Nov

06:00 - 19:35IAD Washington, D.C. Dulles Intl-USM Ko Samui

49h 35m2 stops Los Angeles Hong Kong Intl

11:40 - 05:38USM Ko Samui-IAD Washington, D.C. Dulles Intl

29h 58m2 stops Hong Kong Intl Los Angeles

฿42,458Cathay Pacific

6 hours ago

Booking Insights

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

Use KAYAK data on prices, travel dates, airlines, and seasonal trends to compare options and book flights with more confidence.

Which airline is the cheapest to fly from Washington, D.C. Dulles Intl Airport to Ko Samui?: Cathay Pacific (฿42,458) offered the cheapest return ticket from Washington, D.C. Dulles Intl Airport to Ko Samui in the last 5 days.

Find deals

Cheapest flight	฿20,266

One-way flight from Washington, D.C. Dulles Intl Airport to Ko Samui

When to book flights from Dulles Intl to Ko Samui

Are your dates flexible? Find out the best times to travel from Dulles Intl 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.

Do I need a passport to fly from Washington, D.C. Dulles Intl Airport 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 much should I expect to pay for a Washington, D.C. Dulles Intl Airport to Ko Samui flight?
Return flights from Washington, D.C. Dulles Intl Airport to Ko Samui range from ฿41,720 to ฿55,744, with an average of ฿49,347 over the past 12 months. Anything below ฿41,720 counts as a good deal.
How are flight prices from Washington, D.C. Dulles Intl Airport to Ko Samui looking right now?
One-way fares from Washington, D.C. Dulles Intl Airport to Ko Samui are currently higher than usual. Average one-way flight prices are about ฿24,201, which is 6% above the typical average for this route.
Which car hire options are available at Ko Samui Airport (USM)?
Ko Samui Airport (USM) hosts 5 major car rental companies, with daily rates starting from around ฿431 for economy cars. Top options include:

• Drive Car Rental
• Alamo
• Sixt
• Enterprise Rent-A-Car
• Thai Rent
Which airports can I use when flying from Washington, D.C. Dulles Intl Airport to Ko Samui?
Flights from Washington, D.C. Dulles Intl Airport to Ko Samui usually depart from Washington, D.C. Dulles Intl (IAD) and arrive at Ko Samui (USM).
Can I save money by using flexible dates for flights from Washington, D.C. Dulles Intl Airport to Ko Samui?
Yes. Flexible dates can save you up to 30% on flights from Washington, D.C. Dulles Intl Airport to Ko Samui. Tuesday is the cheapest departure day at ฿38,844 return on average, while Thursday is the most expensive at ฿55,260, a difference of ฿16,416.

KAYAK's flexible dates feature shows options up to three days before and after your selected dates, making it easier to compare nearby fares.
What is the time difference between Washington, D.C. Dulles Intl Airport and Ko Samui?
Ko Samui is 11 hours ahead of Washington, D.C. Dulles Intl Airport (Indochina Time vs Eastern Time). Plan for the time shift when scheduling connections or first-day activities.
What popular places can I visit in Ko Samui?
Some of the most popular sights in Ko Samui are Chaweng Beach, Lamai Beach, and Bophut Beach. These are among the most viewed places in Ko Samui on KAYAK.

If your dates are flexible, aim for a Tuesday departure and avoid flying on Thursday. On this route, Tuesday flights average ฿38,844, which is about ฿16,416 less than Thursday fares (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
• Melia Koh Samui
• Royal Muang Samui Villas

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IAD - USM

฿20,266 Find Cheap Flights from Washington Dulles Airport to Ko Samui – Compare and Save

Everything you should know

Cheap Flights from Dulles Intl to Ko Samui (IAD-USM)

Recent return flight deals from Dulles Intl to Ko Samui

Recent one-way flight deals from Dulles Intl to Ko Samui

Recent last minute flight deals from Dulles Intl to Ko Samui

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

Which airline is the cheapest to fly from Washington, D.C. Dulles Intl Airport to Ko Samui?

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

Cheapest flight

When to book flights from Dulles Intl to Ko Samui

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

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

More options for your flight from Dulles Intl 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 to Ko Samui

Flights from domestic origins to Ko Samui

Flights to other popular destinations