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 29h 42m on average. On the other hand, flying from Baltimore to Ko Samui takes 33h 40m 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.

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

Etihad Airways and Cathay Pacific are the most popular carriers operating from Washington, D.C. to Ko Samui

What day of the week experiences the fewest flight delays on this route?

Saturday is statistically the day of the week which experiences the fewest number of delays on this flight route. Monday has historically seen more delays on average compared to the rest of the week.

Which airline has the best punctuality record on Washington, D.C. to Ko Samui flights?

According to our data, United Airlines have had the least number of delays on this route over the last 12 months; with about 10% of their flights experiencing any sort of delay.

What is the most punctual flight time for Washington, D.C. to Ko Samui flights?

Generally, flights departing in the morning tend to experience fewer delays. Flights in the evening have, in the past, seen delays more frequently in comparison.

How often are flights from Washington, D.C. to Ko Samui delayed?

Historically, on average around 17% of flights between Washington, D.C. and Ko Samui have experienced a delay on any given week. The average delay length over the past 12 months has been 133 minutes.

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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2:35 pm - 9:20 pm

IAD

USM

42h 45m2 stops

8:50 am - 9:05 am

USM

IAD

60h 15m2 stops

$1,133Multiple Airlines

Mon, Jan 12 - Mon, Jan 26

2:35 pm - 7:35 am

IAD

USM

53h 00m2 stops

8:50 am - 9:05 am

USM

IAD

60h 15m2 stops

$1,309Multiple Airlines

Thu, Jan 8 - Wed, Feb 4

9:35 am - 7:35 pm

DCA

USM

46h 00m2 stops

11:40 am - 8:44 pm

USM

DCA

45h 04m2 stops

$1,503Multiple Airlines

Fri, Jan 16 - Fri, Jan 23

1:30 pm - 1:05 pm

IAD

USM

35h 35m2 stops

1:25 pm - 7:20 pm

USM

IAD

41h 55m2 stops

$1,517Turkish Airlines

Thu, Jan 8 - Wed, Feb 4

9:59 am - 7:35 pm

DCA

USM

45h 36m2 stops

11:40 am - 10:59 pm

USM

DCA

47h 19m2 stops

$1,762Cathay Pacific

Mon, Jan 12 - Mon, Jan 26

2:35 pm - 9:20 pm

IAD

USM

42h 45m2 stops

9:10 pm - 8:00 am

USM

IAD

46h 50m3 stops

$1,876Multiple Airlines

Mon, Jan 12 - Mon, Jan 26

1:35 pm - 4:40 pm

DCA

USM

39h 05m3 stops

9:10 pm - 7:08 pm

USM

DCA

33h 58m3 stops

$2,067Qatar Airways

Fri, Jan 16 - Fri, Jan 23

9:35 am - 9:20 pm

DCA

USM

47h 45m3 stops

11:40 am - 4:53 pm

USM

DCA

41h 13m2 stops

$2,114Cathay Pacific

Fri, Jan 16 - Fri, Jan 23

6:42 pm - 7:35 pm

DCA

USM

36h 53m2 stops

11:40 am - 5:08 pm

USM

DCA

41h 28m2 stops

$2,205Cathay Pacific

Thu, Jan 8 - Wed, Feb 4

6:30 am - 6:15 pm

BWI

USM

47h 45m2 stops

1:25 pm - 9:26 pm

USM

BWI

44h 01m2 stops

$3,157Singapore Airlines

Fri, Jan 16 - Fri, Jan 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

Jan 8

IAD1:30 pmWashington, D.C. Dulles Intl

35h 35m

2 stops

USM1:05 pmKo Samui

Feb 4

USM1:25 pmKo Samui

41h 55m

2 stops

IAD7:20 pmWashington, D.C. Dulles Intl

$1,517

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Turkish Airlines

Jan 16

IAD1:30 pmWashington, D.C. Dulles Intl

64h 45m

2 stops

USM6:15 pmKo Samui

Jan 23

USM1:25 pmKo Samui

34h 20m

2 stops

IAD11:45 amWashington, D.C. Dulles Intl

$1,528

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

Jan 12

DCA9:59 amWashington, D.C. Reagan-National

45h 36m

2 stops

USM7:35 pmKo Samui

Jan 26

USM11:40 amKo Samui

47h 19m

2 stops

DCA10:59 pmWashington, D.C. Reagan-National

$1,762

Find similar

Cathay Pacific

Jan 16

DCA9:35 amWashington, D.C. Reagan-National

47h 45m

3 stops

USM9:20 pmKo Samui

Jan 23

USM11:40 amKo Samui

41h 13m

2 stops

DCA4:53 pmWashington, D.C. Reagan-National

$2,114

Find similar

Cathay Pacific

Jan 8

DCA6:42 pmWashington, D.C. Reagan-National

36h 53m

2 stops

USM7:35 pmKo Samui

Feb 4

USM11:40 amKo Samui

41h 28m

2 stops

DCA5:08 pmWashington, D.C. Reagan-National

$2,205

Find similar

momondo Fare Finder

Use the filters below to find and compare flights from Washington, D.C. to Ko Samui that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Washington, D.C.Ko Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

Mon 1/12

2:35 pm-9:20 pm

2 stops42h 45m

Ko Samui

Mon 1/26

8:50 am-9:05 am

2 stops60h 15m

$1,133

Washington, D.C.Ko Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

Thu 1/8

2:35 pm-7:35 am

2 stops53h 00m

Ko Samui

Wed 2/4

8:50 am-9:05 am

2 stops60h 15m

$1,309

Washington, D.C.Ko Samui

DCA - USM

DCAUSM

Washington, D.C. Reagan-National

Fri 1/16

9:35 am-7:35 pm

2 stops46h 00m

Ko Samui

Fri 1/23

11:40 am-8:44 pm

2 stops45h 04m

$1,503

Washington, D.C.Ko Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

Thu 1/8

1:30 pm-1:05 pm

2 stops35h 35m

Ko Samui

Wed 2/4

1:25 pm-7:20 pm

2 stops41h 55m

$1,517

Washington, D.C.Ko Samui

DCA - USM

DCAUSM

Washington, D.C. Reagan-National

Mon 1/12

9:59 am-7:35 pm

2 stops45h 36m

Ko Samui

Mon 1/26

11:40 am-10:59 pm

2 stops47h 19m

$1,762

Washington, D.C.Ko Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

Mon 1/12

2:35 pm-9:20 pm

2 stops42h 45m

Ko Samui

Mon 1/26

9:10 pm-8:00 am

3 stops46h 50m

$1,876

Washington, D.C.Ko Samui

DCA - USM

DCAUSM

Washington, D.C. Reagan-National

Fri 1/16

1:35 pm-4:40 pm

3 stops39h 05m

Ko Samui

Fri 1/23

9:10 pm-7:08 pm

3 stops33h 58m

$2,067

Washington, D.C.Ko Samui

DCA - USM

DCAUSM

Washington, D.C. Reagan-National

Fri 1/16

9:35 am-9:20 pm

3 stops47h 45m

Ko Samui

Fri 1/23

11:40 am-4:53 pm

2 stops41h 13m

$2,114

Washington, D.C.Ko Samui

DCA - USM

DCAUSM

Washington, D.C. Reagan-National

Thu 1/8

6:42 pm-7:35 pm

2 stops36h 53m

Ko Samui

Wed 2/4

11:40 am-5:08 pm

2 stops41h 28m

$2,205

BaltimoreKo Samui

BWI - USM

BWIUSM

Baltimore/Washington

Fri 1/16

6:30 am-6:15 pm

2 stops47h 45m

Ko Samui

Fri 1/23

1:25 pm-9:26 pm

2 stops44h 01m

$3,157

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 16 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

Delays

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

Fastest flight time	28h 35m
Direct flights	None

The fastest flight from Washington, D.C. to Ko Samui takes 28h 35m

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.

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 28h 35m.
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.
What is the most popular airline from Washington, D.C. to Ko Samui?
Based on momondo bookings for flights between Washington, D.C. and Ko Samui, the leading airline is Qatar Airways, making up 100% of the total bookings.

Ko Tao

Ko Pha Ngan

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.

An easier way to manage your Ko Samui trip

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Cheap flights from Washington, D.C. to Ko Samui from $517

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Washington, D.C. to Ko Samui departing on 3/12. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

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

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

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

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See travel insights to Ko Samui from

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

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

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

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

Etihad Airways and Cathay Pacific are the most popular carriers operating from Washington, D.C. to Ko Samui

How often are flights from Washington, D.C. to Ko Samui delayed?

Historically, on average around 17% of flights between Washington, D.C. and Ko Samui have experienced a delay on any given week. The average delay length over the past 12 months has been 133 minutes.

What is the most punctual flight time for Washington, D.C. to Ko Samui flights?

Generally, flights departing in the morning tend to experience fewer delays. Flights in the evening have, in the past, seen delays more frequently in comparison.

What day of the week experiences the fewest flight delays on this route?

Saturday is statistically the day of the week which experiences the fewest number of delays on this flight route. Monday has historically seen more delays on average compared to the rest of the week.

Which airline has the best punctuality record on Washington, D.C. to Ko Samui flights?

According to our data, United Airlines have had the least number of delays on this route over the last 12 months; with about 10% of their flights experiencing any sort of delay.

How long does it take to fly to Ko Samui?

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

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

Fastest flight time

Direct flights

How far is Washington, D.C. to Ko Samui by plane?

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

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

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

What is the most popular airline from Washington, D.C. to Ko Samui?

Traveling to a place near Ko Samui?

Why use momondo?

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

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

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

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

An easier way to manage your Ko Samui trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to Thailand

Airports servicing Thailand