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 34h 28m on average. On the other hand, flying from Baltimore to Ko Samui takes 35h 47m 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

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

Round-trip

One-way

Cheap round-trip flights

12:15 pm - 8:15 amIAD-USM

33h 00m2 stops

7:55 am - 9:10 amUSM-IAD

37h 15m2 stops

$1,174

Find Deal

Tue, Oct 21 - Tue, Nov 4

9:40 pm - 9:10 pmIAD-USM

36h 30m2 stops

4:25 pm - 11:45 amUSM-IAD

30h 20m2 stops

$1,175Turkish Airlines

Find Deal

Wed, Sep 17 - Tue, Sep 30

8:05 pm - 11:55 amIAD-USM

27h 50m2 stops

3:50 pm - 3:55 pmUSM-IAD

36h 05m2 stops

$1,405Qatar Airways

Find Deal

Sat, Nov 29 - Sun, Jan 25

8:05 pm - 3:10 pmIAD-USM

31h 05m2 stops

6:15 pm - 8:20 amUSM-IAD

50h 05m2 stops

$1,558Qatar Airways

Find Deal

Sat, Nov 29 - Fri, Jan 30

10:45 pm - 6:35 pmDCA-USM

56h 50m2 stops

10:55 am - 7:58 pmUSM-DCA

44h 03m2 stops

$1,668Cathay Pacific

Find Deal

Sun, Sep 7 - Tue, Sep 23

6:45 am - 6:35 pmDCA-USM

24h 50m2 stops

10:55 am - 7:58 pmUSM-DCA

44h 03m2 stops

$1,719Cathay Pacific

Find Deal

Wed, Sep 17 - Tue, Sep 30

9:59 am - 6:15 pmDCA-USM

45h 16m2 stops

1:25 pm - 8:00 pmUSM-DCA

41h 35m2 stops

$1,776Singapore Airlines

Find Deal

Mon, Oct 20 - Tue, Oct 28

7:28 pm - 6:15 pmBWI-USM

35h 47m2 stops

4:25 pm - 6:57 pmUSM-BWI

61h 32m3 stops

$2,024Singapore Airlines

Find Deal

Wed, Oct 1 - Fri, Oct 31

9:35 pm - 9:10 pmBWI-USM

36h 35m2 stops

4:25 pm - 7:45 pmUSM-BWI

38h 20m2 stops

$2,651British Airways

Find Deal

Sun, Sep 7 - Tue, Sep 23

7:25 pm - 9:10 pmIAD-USM

38h 45m2 stops

1:25 pm - 7:55 pmUSM-IAD

42h 30m2 stops

$2,968British Airways

Find Deal

Mon, Sep 1 - Mon, Feb 23

Turkish Airlines flights from Washington, D.C. to Ko Samui

Our best Turkish Airlines deals on Washington, D.C. to Ko Samui flight tickets

Turkish Airlines

Sep 17

IAD9:40 pmWashington, D.C. Dulles Intl

36h 30m

2 stops

USM9:10 pmKo Samui

Sep 30

USM4:25 pmKo Samui

30h 20m

2 stops

IAD11:45 amWashington, D.C. Dulles Intl

$1,175

Find similar

Turkish Airlines

Sep 7

IAD9:40 pmWashington, D.C. Dulles Intl

24h 40m

2 stops

USM9:20 amKo Samui

Sep 23

USM9:00 pmKo Samui

33h 45m

2 stops

IAD7:45 pmWashington, D.C. Dulles Intl

$1,176

Find similar

Turkish Airlines

Sep 25

IAD1:30 pmWashington, D.C. Dulles Intl

31h 45m

2 stops

USM8:15 amKo Samui

Sep 29

USM3:30 pmKo Samui

31h 15m

2 stops

IAD11:45 amWashington, D.C. Dulles Intl

$1,195

Find similar

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

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

Qatar Airways

Nov 29

IAD8:05 pmWashington, D.C. Dulles Intl

27h 50m

2 stops

USM11:55 amKo Samui

Jan 25

USM3:50 pmKo Samui

36h 05m

2 stops

IAD3:55 pmWashington, D.C. Dulles Intl

$1,405

Find similar

Qatar Airways

Nov 29

IAD8:05 pmWashington, D.C. Dulles Intl

31h 05m

2 stops

USM3:10 pmKo Samui

Jan 30

USM6:15 pmKo Samui

50h 05m

2 stops

IAD8:20 amWashington, D.C. Dulles Intl

$1,558

Find similar

Qatar Airways

Nov 29

IAD8:05 pmWashington, D.C. Dulles Intl

26h 35m

2 stops

USM10:40 amKo Samui

Jan 30

USM1:25 pmKo Samui

38h 30m

2 stops

IAD3:55 pmWashington, D.C. Dulles Intl

$1,634

Find similar

Fly from

Fly to

Route

Depart

Return

Price

Washington, D.C.Ko Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

Tue 10/21

12:15 pm-8:15 am

2 stops33h 00m

Ko Samui

Tue 11/4

7:55 am-9:10 am

2 stops37h 15m

$1,174

Washington, D.C.Ko Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

Wed 9/17

9:40 pm-9:10 pm

2 stops36h 30m

Ko Samui

Tue 9/30

4:25 pm-11:45 am

2 stops30h 20m

$1,175

Washington, D.C.Ko Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

Sat 11/29

8:05 pm-11:55 am

2 stops27h 50m

Ko Samui

Sun 1/25

3:50 pm-3:55 pm

2 stops36h 05m

$1,405

Washington, D.C.Ko Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

Sat 11/29

8:05 pm-3:10 pm

2 stops31h 05m

Ko Samui

Fri 1/30

6:15 pm-8:20 am

2 stops50h 05m

$1,558

Washington, D.C.Ko Samui

DCA - USM

DCAUSM

Washington, D.C. Reagan-National

Sun 9/7

10:45 pm-6:35 pm

2 stops56h 50m

Ko Samui

Tue 9/23

10:55 am-7:58 pm

2 stops44h 03m

$1,668

Washington, D.C.Ko Samui

DCA - USM

DCAUSM

Washington, D.C. Reagan-National

Wed 9/17

6:45 am-6:35 pm

2 stops24h 50m

Ko Samui

Tue 9/30

10:55 am-7:58 pm

2 stops44h 03m

$1,719

Washington, D.C.Ko Samui

DCA - USM

DCAUSM

Washington, D.C. Reagan-National

Mon 10/20

9:59 am-6:15 pm

2 stops45h 16m

Ko Samui

Tue 10/28

1:25 pm-8:00 pm

2 stops41h 35m

$1,776

BaltimoreKo Samui

BWI - USM

BWIUSM

Baltimore/Washington

Wed 10/1

7:28 pm-6:15 pm

2 stops35h 47m

Ko Samui

Fri 10/31

4:25 pm-6:57 pm

3 stops61h 32m

$2,024

BaltimoreKo Samui

BWI - USM

BWIUSM

Baltimore/Washington

Sun 9/7

9:35 pm-9:10 pm

2 stops36h 35m

Ko Samui

Tue 9/23

4:25 pm-7:45 pm

2 stops38h 20m

$2,651

Washington, D.C.Ko Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

Mon 9/1

7:25 pm-9:10 pm

2 stops38h 45m

Ko Samui

Mon 2/23

1:25 pm-7:55 pm

2 stops42h 30m

$2,968

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

Best Price Found	$596
Fastest flight time	24h 40m
Direct flights	None
Airports in Ko Samui	1 airport

The best one-way flight to Ko Samui from Washington, D.C. in the past 72 hours is $596. The best round-trip flight deal from Washington, D.C. to Ko Samui found on momondo in the last 72 hours is $1,174.

The fastest flight from Washington, D.C. to Ko Samui takes 24h 40m

There are no direct flights from Washington, D.C. to Ko Samui. Popular non-direct routes for this connection are Washington, D.C. Reagan-National Airport - Ko Samui Airport, Baltimore/Washington Airport - Ko Samui Airport and Washington, D.C. Dulles Intl Airport - Ko Samui Airport.

There is 1 airport near Ko Samui: Ko Samui (USM)

Search flight deals

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 24h 40m.
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.