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. Being flexible with your travel dates can save you up to 30% on the Washington, D.C. Dulles Intl Airport 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. 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.

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 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. Dulles Intl Airport to Ko Samui flight?

Round-trip flights from Washington, D.C. Dulles Intl Airport 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.

$564 CHEAP FLIGHTS from Washington Dulles to Ko Samui (IAD - USM)

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Cheapest round-trip

$1,086

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

Multiple Airlines

Thu 11/8Sun 11/25

IAD - USM • 2 stops

Cheapest one-way

$564

Typical prices: $710-$710

Etihad Airways

Thu 8/30

IAD - USM • 2 stops

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We hope you love 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.

Round-trip

One-way

Last minute

Recent round-trip flight deals from Dulles Intl to Ko Samui

Sun, Nov 8 - Wed, Nov 25

2:35 pm - 10:40 amIAD Washington, D.C. Dulles Intl-USM Ko Samui

32h 05m2 stops Abu Dhabi Zayed Intl Phuket City

7:55 am - 9:05 amUSM Ko Samui-IAD Washington, D.C. Dulles Intl

37h 10m2 stops Bangkok Suvarnabhumi 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

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

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

Mon, Sep 14 - Thu, Sep 17

1:15 pm - 8:25 pmIAD Washington, D.C. Dulles Intl-USM Ko Samui

44h 10m2 stops Istanbul Phuket City

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

28h 55m2 stops Bangkok Suvarnabhumi Istanbul

$1,339Turkish 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

Sun, Nov 15 - Thu, Nov 19

8:05 pm - 3:10 pmIAD Washington, D.C. Dulles Intl-USM Ko Samui

31h 05m2 stops Doha Hamad Intl Phuket City

12:30 pm - 3:55 pmUSM Ko Samui-IAD Washington, D.C. Dulles Intl

39h 25m2 stops Phuket City Doha Hamad Intl

$1,507Qatar Airways

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 from Washington, D.C. Dulles Intl Airport to Ko Samui with more confidence.

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

Etihad Airways ($1,164) and Turkish Airlines ($1,339) are the cheapest airlines to fly round-trip from Washington, D.C. Dulles Intl Airport to Ko Samui according to KAYAK data over the last 5 days.

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Expert advice

Our travel experts

Daniel Scheffler

Expert on Sun Country Air

Daniel Scheffler is a travel writer, podcaster, and producer. Born in Africa, bred in Europe and now living in America he has traveled to 140 countries (and all 50 U.S. states). Plus he has stayed at over 2500 hotels across the globe. His original shows Everywhere and Without Maps (available on Spotify) showcase his beliefs, travel is about humanity and sharing that beauty. And thus it reminds you that you shouldn’t believe everything you think.

Stefanie Waldek

Expert on Delta and United Airlines

Stefanie Waldek is a freelance space, travel, and design writer based in Saratoga Springs, NY. Her words have appeared in Space.com, Travel + Leisure, Condé Nast Traveler, Architectural Digest, and House Beautiful, among other publications. An expert in aviation and expedition cruising, Stefanie is frequently up in the air or on the sea, likely en route to Antarctica or the Arctic.

Cheapest flight	$564

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 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. 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. Being flexible with your travel dates can save you up to 30% on the Washington, D.C. Dulles Intl Airport 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. 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 in line with typical prices for this route. Average one-way fares are about $725.
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 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. Dulles Intl Airport to Ko Samui flight?
Round-trip flights from Washington, D.C. Dulles Intl Airport 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 Dulles Intl to Ko Samui

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Washington Dulles Airport (IAD)

Ko Samui (USM)

IAD - USM

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Everything you should know

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

Recent round-trip 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

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

Expert advice for your flight from Dulles Intl 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

Everything you need to know for your flight from Dulles Intl to Ko Samui

Information on your arrival and departure airports

Cabin class types available on flights to Ko Samui

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

Find direct flights to and from Dulles Intl and Ko Samui

Flights to other popular destinations

Flights from domestic origins to Ko Samui

Choose which airport to fly into in Ko Samui