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

Turkish Airlines, Cathay Pacific, and Singapore Airlines are the most popular carriers operating from Washington, D.C. to Ko Samui

How long does it take to fly to Ko Samui?

Flight times vary depending on what airport in Washington, D.C. you fly out of and what airport in Ko Samui you fly into. For example, flying from Washington, D.C. to Ko Samui takes 32h 52m on average. On the other hand, flying from Baltimore to Ko Samui takes 33h 45m on average. Keep in mind that it’s always quicker to opt for a non-stop flight, so be sure to check momondo if there are any available for your route.

When did momondo last update prices for flights from Washington, D.C. to Ko Samui Airport?

Prices for flights from Washington, D.C. to Ko Samui Airport are updated daily.

How old do you have to be to fly from Washington, D.C. to Ko Samui Airport?

The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Washington, D.C. to Ko Samui Airport.

What documentation or ID do you need to fly to Ko Samui Airport?

The required travel and health documents for your Ko Samui Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Ko Samui Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

$143 Cheap Flights from Washington, D.C. to Ko Samui in 2025/26

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Find the cheapest flights from Washington, D.C. to Ko Samui

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9:10 pm - 11:55 amIAD-USM

26h 45m2 stops

6:15 pm - 3:30 pmUSM-IAD

33h 15m2 stops

$1,240Etihad Airways

Find Deal

週三, 11月 19 - 週三, 11月 26

9:15 pm - 6:15 pmIAD-USM

33h 00m2 stops

4:25 pm - 12:45 pmUSM-IAD

31h 20m2 stops

$1,284Turkish Airlines

Find Deal

週一, 12月 8 - 週一, 3月 9

9:15 pm - 6:15 pmIAD-USM

33h 00m2 stops

8:15 am - 11:45 amUSM-IAD

39h 30m2 stops

$1,299Turkish Airlines

Find Deal

週六, 11月 29 - 週六, 12月 6

9:15 pm - 6:15 pmIAD-USM

33h 00m2 stops

9:10 pm - 7:20 pmUSM-IAD

34h 10m2 stops

$1,304Multiple Airlines

Find Deal

週六, 11月 29 - 週日, 1月 25

6:00 am - 7:35 pmDCA-USM

49h 35m2 stops

11:40 am - 8:44 pmUSM-DCA

45h 04m2 stops

$1,405Cathay Pacific

Find Deal

週四, 11月 13 - 週四, 11月 27

9:45 am - 7:35 pmDCA-USM

45h 50m2 stops

11:40 am - 6:44 pmUSM-DCA

43h 04m2 stops

$1,441Cathay Pacific

Find Deal

週四, 11月 13 - 週一, 11月 17

9:15 pm - 6:15 pmIAD-USM

33h 00m2 stops

6:15 pm - 3:30 pmUSM-IAD

33h 15m3 stops

$1,443Multiple Airlines

Find Deal

週六, 11月 29 - 週六, 12月 6

8:05 pm - 10:40 amIAD-USM

50h 35m2 stops

12:30 pm - 3:55 pmUSM-IAD

39h 25m2 stops

$1,543Qatar Airways

Find Deal

週四, 11月 13 - 週一, 11月 17

8:05 pm - 10:40 amIAD-USM

50h 35m2 stops

1:25 pm - 3:55 pmUSM-IAD

38h 30m2 stops

$1,584Qatar Airways

Find Deal

週四, 11月 13 - 週一, 11月 17

7:29 am - 8:15 pmBWI-USM

48h 46m3 stops

7:00 pm - 4:32 pmUSM-BWI

33h 32m3 stops

$1,752Japan Airlines

Find Deal

週三, 11月 19 - 週三, 11月 26

Etihad Airways flights from Washington, D.C. to Ko Samui

Our best Etihad Airways deals on Washington, D.C. to Ko Samui flight tickets

Etihad Airways

Nov 19

IAD9:10 pmWashington, D.C. Dulles Intl

26h 45m

2 stops

USM11:55 amKo Samui

Nov 26

USM6:15 pmKo Samui

33h 15m

2 stops

IAD3:30 pmWashington, D.C. Dulles Intl

$1,240

Find similar

Etihad Airways

Nov 29

IAD9:10 pmWashington, D.C. Dulles Intl

33h 05m

2 stops

USM6:15 pmKo Samui

Jan 26

USM8:50 amKo Samui

60h 15m

2 stops

IAD9:05 amWashington, D.C. Dulles Intl

$1,300

Find similar

Etihad Airways

Feb 10

IAD2:35 pmWashington, D.C. Dulles Intl

29h 30m

2 stops

USM8:05 amKo Samui

Feb 24

USM5:40 pmKo Samui

27h 25m

2 stops

IAD9:05 amWashington, D.C. Dulles Intl

$5,432

Find similar

Cathay Pacific flights from Washington, D.C. to Ko Samui

Our best Cathay Pacific deals on Washington, D.C. to Ko Samui flight tickets

Cathay Pacific

Nov 13

DCA6:00 amWashington, D.C. Reagan-National

49h 35m

2 stops

USM7:35 pmKo Samui

Nov 27

USM11:40 amKo Samui

45h 04m

2 stops

DCA8:44 pmWashington, D.C. Reagan-National

$1,405

Find similar

Cathay Pacific

Nov 13

DCA9:45 amWashington, D.C. Reagan-National

45h 50m

2 stops

USM7:35 pmKo Samui

Nov 17

USM11:40 amKo Samui

43h 04m

2 stops

DCA6:44 pmWashington, D.C. Reagan-National

$1,441

Find similar

Cathay Pacific

Nov 13

DCA6:50 amWashington, D.C. Reagan-National

48h 45m

2 stops

USM7:35 pmKo Samui

Dec 1

USM11:40 amKo Samui

43h 10m

2 stops

DCA6:50 pmWashington, D.C. Reagan-National

$1,533

Find similar

Fly from

Fly to

Route

Depart

Return

Price

Washington, D.C.Ko Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

週三 11/19

9:10 pm-11:55 am

2 stops26h 45m

Ko Samui

週三 11/26

6:15 pm-3:30 pm

2 stops33h 15m

$1,240

Washington, D.C.Ko Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

週一 12/8

9:15 pm-6:15 pm

2 stops33h 00m

Ko Samui

週一 3/9

4:25 pm-12:45 pm

2 stops31h 20m

$1,284

Washington, D.C.Ko Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

週六 11/29

9:15 pm-6:15 pm

2 stops33h 00m

Ko Samui

週六 12/6

8:15 am-11:45 am

2 stops39h 30m

$1,299

Washington, D.C.Ko Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

週六 11/29

9:15 pm-6:15 pm

2 stops33h 00m

Ko Samui

週日 1/25

9:10 pm-7:20 pm

2 stops34h 10m

$1,304

Washington, D.C.Ko Samui

DCA - USM

DCAUSM

Washington, D.C. Reagan-National

週四 11/13

6:00 am-7:35 pm

2 stops49h 35m

Ko Samui

週四 11/27

11:40 am-8:44 pm

2 stops45h 04m

$1,405

Washington, D.C.Ko Samui

DCA - USM

DCAUSM

Washington, D.C. Reagan-National

週四 11/13

9:45 am-7:35 pm

2 stops45h 50m

Ko Samui

週一 11/17

11:40 am-6:44 pm

2 stops43h 04m

$1,441

Washington, D.C.Ko Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

週六 11/29

9:15 pm-6:15 pm

2 stops33h 00m

Ko Samui

週六 12/6

6:15 pm-3:30 pm

3 stops33h 15m

$1,443

Washington, D.C.Ko Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

週四 11/13

8:05 pm-10:40 am

2 stops50h 35m

Ko Samui

週一 11/17

12:30 pm-3:55 pm

2 stops39h 25m

$1,543

Washington, D.C.Ko Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

週四 11/13

8:05 pm-10:40 am

2 stops50h 35m

Ko Samui

週一 11/17

1:25 pm-3:55 pm

2 stops38h 30m

$1,584

BaltimoreKo Samui

BWI - USM

BWIUSM

Baltimore/Washington

週三 11/19

7:29 am-8:15 pm

3 stops48h 46m

Ko Samui

週三 11/26

7:00 pm-4:32 pm

3 stops33h 32m

$1,752

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from Washington, D.C. to Ko Samui

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

Prices

Airlines

Other information

What is the cheapest day to depart on your flight to Ko Samui?

Our data shows that Wednesday is the least expensive day to fly to Ko Samui. Tickets to fly out on this day can be as low as $325. Flights from Washington, D.C. to Ko Samui on a Sunday will generally be more expensive and average around $714. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

What is the cheapest time of day to depart on your flight to Ko Samui?

Our data shows that the cheapest Washington, D.C. to Ko Samui flights are usually those with departure times in the evening. Our users have found flights to Ko Samui in the evening for as low as $286. At noon is when there is more demand to fly to Ko Samui, so prices are often more expensive at around $399 per ticket.

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

Are you open to changing your travel dates? Check out the ideal times to fly from Washington, D.C. to Ko Samui according to our flight data. Find out which month and days have the cheapest flights.

Estimated round-trip price

Cheap Washington, D.C. to Ko Samui (WAS to USM) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Washington, D.C. to Ko Samui

Direct flights	None

There are no direct flights from Washington, D.C. to Ko Samui. There are no popular flight routes from Washington, D.C. to Ko Samui.

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How far is Washington, D.C. to Ko Samui by plane?
Washington, D.C. and Ko Samui are 9079.2 mi apart from one another. A reasonable flight in good conditions will take 25h 25m.
When did momondo last update prices for flights from Washington, D.C. to Ko Samui Airport?
Prices for flights from Washington, D.C. to Ko Samui Airport are updated daily.
How old do you have to be to fly from Washington, D.C. to Ko Samui Airport?
The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Washington, D.C. to Ko Samui Airport.
What documentation or ID do you need to fly to Ko Samui Airport?
The required travel and health documents for your Ko Samui Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Ko Samui Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

Ko Pha Ngan

Ko Tao

Khanom

Why use momondo?

Why should I use momondo to find a flight deal from Washington, D.C. to Ko Samui?

It is quick and easy to find Washington, D.C. to Ko Samui flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Ko Samui that suits you.

Can I find flights from Washington, D.C. to Ko Samui with flexible booking policies on momondo?

All flight searches from Washington, D.C. to Ko Samui on momondo can be filtered to show those which offer flexible booking policies.

How can momondo help me find flights from Washington, D.C. to Ko Samui?

Once all potential Washington, D.C. to Ko Samui flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

I’m not ready to book a flight from Washington, D.C. to Ko Samui right now. Can momondo alert me if prices change?

Yes. momondo can track prices for Washington, D.C. to Ko Samui flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.