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

Historically, on average around 23% 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 130 minutes.

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 Baltimore to Ko Samui takes 35h 20m on average. On the other hand, flying from Washington, D.C. to Ko Samui takes 37h 12m 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 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. Sunday 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, American Airlines have had the least number of delays on this route over the last 12 months; with about 22% of their flights experiencing any sort of delay.

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.

$595 Cheap Flights from Washington, D.C. to Ko Samui in 2026/27

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

Round-trip

One-way

Cheap round-trip flights

Enter your travel dates to find the best prices.

11:50 am - 7:50 pmIAD Washington, D.C. Dulles Intl-USM Ko Samui

44h 00m2 stops Incheon Intl Bangkok Suvarnabhumi

4:30 pm - 9:50 amUSM Ko Samui-IAD Washington, D.C. Dulles Intl

29h 20m2 stops Bangkok Suvarnabhumi Incheon Intl

$1,050Multiple Airlines

Mon, Nov 2 - Mon, Nov 9

11:50 am - 7:10 amIAD Washington, D.C. Dulles Intl-USM Ko Samui

31h 20m2 stops Incheon Intl Bangkok Suvarnabhumi

8:30 am - 9:50 amUSM Ko Samui-IAD Washington, D.C. Dulles Intl

37h 20m2 stops Bangkok Suvarnabhumi Incheon Intl

$1,071Multiple Airlines

Wed, Nov 4 - Wed, Nov 11

2:35 pm - 5:00 pmIAD Washington, D.C. Dulles Intl-USM Ko Samui

38h 25m2 stops Abu Dhabi Zayed Intl Bangkok Suvarnabhumi

4:30 pm - 9:05 amUSM Ko Samui-IAD Washington, D.C. Dulles Intl

28h 35m2 stops Bangkok Suvarnabhumi Abu Dhabi Zayed Intl

$1,136Multiple Airlines

Tue, Nov 10 - Mon, Nov 16

2:35 pm - 3:35 pmIAD Washington, D.C. Dulles Intl-USM Ko Samui

37h 00m2 stops Abu Dhabi Zayed Intl Bangkok Suvarnabhumi

2:25 pm - 9:05 amUSM Ko Samui-IAD Washington, D.C. Dulles Intl

30h 40m2 stops Bangkok Suvarnabhumi Abu Dhabi Zayed Intl

$1,146Multiple Airlines

Tue, Nov 10 - Mon, Nov 16

11:55 pm - 4:25 pmIAD Washington, D.C. Dulles Intl-USM Ko Samui

28h 30m2 stops Taipei City Taiwan Taoyuan Intl Bangkok Suvarnabhumi

8:30 pm - 9:55 pmUSM Ko Samui-IAD Washington, D.C. Dulles Intl

36h 25m2 stops Bangkok Suvarnabhumi Taipei City Taiwan Taoyuan Intl

$1,222EVA Air

Wed, Mar 10 - Sun, Mar 14

10:11 am - 7:35 pmDCA Washington, D.C. Reagan-National-USM Ko Samui

45h 24m2 stops Chicago O'Hare Intl Hong Kong Intl

7:00 am - 10:46 pmUSM Ko Samui-DCA Washington, D.C. Reagan-National

27h 46m3 stops Bangkok Suvarnabhumi Hong Kong Intl Dallas/Fort Worth

$1,258Multiple Airlines

Wed, Nov 4 - Wed, Nov 11

9:20 pm - 11:55 amIAD Washington, D.C. Dulles Intl-USM Ko Samui

26h 35m2 stops Istanbul Phuket City

3:50 pm - 11:45 amUSM Ko Samui-IAD Washington, D.C. Dulles Intl

31h 55m2 stops Phuket City Istanbul

$1,284Multiple Airlines

Wed, Feb 3 - Wed, Feb 10

9:55 am - 6:55 amIAD Washington, D.C. Dulles Intl-USM Ko Samui

33h 00m3 stops Toronto Pearson Intl Hong Kong Intl Bangkok Suvarnabhumi

5:40 pm - 5:31 amUSM Ko Samui-IAD Washington, D.C. Dulles Intl

47h 51m3 stops Bangkok Suvarnabhumi Hong Kong Intl Seattle/Tacoma Intl

$1,286Multiple Airlines

Wed, Feb 3 - Wed, Feb 10

10:11 am - 7:35 pmDCA Washington, D.C. Reagan-National-USM Ko Samui

45h 24m2 stops Chicago O'Hare Intl Hong Kong Intl

7:55 am - 10:46 pmUSM Ko Samui-DCA Washington, D.C. Reagan-National

26h 51m3 stops Bangkok Suvarnabhumi Hong Kong Intl Dallas/Fort Worth

$1,305Multiple Airlines

Mon, Nov 2 - Mon, Nov 9

1:15 am - 3:25 pmIAD Washington, D.C. Dulles Intl-USM Ko Samui

27h 10m2 stops Taipei City Taiwan Taoyuan Intl Bangkok Suvarnabhumi

9:10 pm - 9:55 pmUSM Ko Samui-IAD Washington, D.C. Dulles Intl

59h 45m2 stops Bangkok Suvarnabhumi Taipei City Taiwan Taoyuan Intl

$1,312EVA Air

Wed, Oct 21 - Mon, Oct 26

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EVA Air flights from Washington, D.C. to Ko Samui

Our best EVA Air deals on Washington, D.C. to Ko Samui flight tickets

EVA Air

Mar 10

IAD11:55 pmWashington, D.C. Dulles Intl

28h 30m

2 stops

USM4:25 pmKo Samui

Mar 14

USM8:30 pmKo Samui

36h 25m

2 stops

IAD9:55 pmWashington, D.C. Dulles Intl

$1,222

EVA Air

Oct 21

IAD1:15 amWashington, D.C. Dulles Intl

27h 10m

2 stops

USM3:25 pmKo Samui

Oct 26

USM9:10 pmKo Samui

59h 45m

2 stops

IAD9:55 pmWashington, D.C. Dulles Intl

$1,312

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

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

British Airways

Nov 10

BWI6:55 pmBaltimore/Washington

38h 10m

2 stops

USM9:05 pmKo Samui

Nov 16

USM4:25 pmKo Samui

36h 40m

2 stops

BWI5:05 pmBaltimore/Washington

$2,297

British Airways

Nov 2

BWI6:55 pmBaltimore/Washington

38h 10m

2 stops

USM9:05 pmKo Samui

Nov 9

USM4:25 pmKo Samui

36h 40m

2 stops

BWI5:05 pmBaltimore/Washington

$2,298

British Airways

Nov 4

BWI6:55 pmBaltimore/Washington

38h 10m

2 stops

USM9:05 pmKo Samui

Nov 11

USM4:25 pmKo Samui

36h 40m

2 stops

BWI5:05 pmBaltimore/Washington

$2,352

momondo Fare Finder

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

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Route

Depart

Return

Price

Cheapest round-trip

Washington, D.C.Ko Samui

IAD Washington, D.C. Dulles Intl - USM Ko Samui

IADUSM

Washington, D.C. Dulles Intl

Mon 11/2

11:50 am-7:50 pm

2 stops44h 00m

Ko Samui

Mon 11/9

4:30 pm-9:50 am

2 stops29h 20m

$1,050

Washington, D.C.Ko Samui

IAD Washington, D.C. Dulles Intl - USM Ko Samui

IADUSM

Washington, D.C. Dulles Intl

Wed 11/4

11:50 am-7:10 am

2 stops31h 20m

Ko Samui

Wed 11/11

8:30 am-9:50 am

2 stops37h 20m

$1,071

Washington, D.C.Ko Samui

IAD Washington, D.C. Dulles Intl - USM Ko Samui

IADUSM

Washington, D.C. Dulles Intl

Tue 11/10

2:35 pm-5:00 pm

2 stops38h 25m

Ko Samui

Mon 11/16

4:30 pm-9:05 am

2 stops28h 35m

$1,136

Washington, D.C.Ko Samui

IAD Washington, D.C. Dulles Intl - USM Ko Samui

IADUSM

Washington, D.C. Dulles Intl

Tue 11/10

2:35 pm-3:35 pm

2 stops37h 00m

Ko Samui

Mon 11/16

2:25 pm-9:05 am

2 stops30h 40m

$1,146

Washington, D.C.Ko Samui

IAD Washington, D.C. Dulles Intl - USM Ko Samui

IADUSM

Washington, D.C. Dulles Intl

Wed 3/10

11:55 pm-4:25 pm

2 stops28h 30m

Ko Samui

Sun 3/14

8:30 pm-9:55 pm

2 stops36h 25m

$1,222

Washington, D.C.Ko Samui

DCA Washington, D.C. Reagan-National - USM Ko Samui

DCAUSM

Washington, D.C. Reagan-National

Wed 11/4

10:11 am-7:35 pm

2 stops45h 24m

Ko Samui

Wed 11/11

7:00 am-10:46 pm

3 stops27h 46m

$1,258

Quickest round-trip

Washington, D.C.Ko Samui

IAD Washington, D.C. Dulles Intl - USM Ko Samui

IADUSM

Washington, D.C. Dulles Intl

Wed 2/3

9:20 pm-11:55 am

2 stops26h 35m

Ko Samui

Wed 2/10

3:50 pm-11:45 am

2 stops31h 55m

$1,284

Washington, D.C.Ko Samui

IAD Washington, D.C. Dulles Intl - USM Ko Samui

IADUSM

Washington, D.C. Dulles Intl

Wed 2/3

9:55 am-6:55 am

3 stops33h 00m

Ko Samui

Wed 2/10

5:40 pm-5:31 am

3 stops47h 51m

$1,286

Washington, D.C.Ko Samui

DCA Washington, D.C. Reagan-National - USM Ko Samui

DCAUSM

Washington, D.C. Reagan-National

Mon 11/2

10:11 am-7:35 pm

2 stops45h 24m

Ko Samui

Mon 11/9

7:55 am-10:46 pm

3 stops26h 51m

$1,305

Washington, D.C.Ko Samui

IAD Washington, D.C. Dulles Intl - USM Ko Samui

IADUSM

Washington, D.C. Dulles Intl

Wed 10/21

1:15 am-3:25 pm

2 stops27h 10m

Ko Samui

Mon 10/26

9:10 pm-9:55 pm

2 stops59h 45m

$1,312

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

Airlines

Delays

Other information

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

Cathay Pacific is the most popular carrier operating from Washington, D.C. to Ko Samui

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	$595
Fastest flight time	29h 00m
Direct flights	None

The best one-way flight to Ko Samui from Washington, D.C. in the past 72 hours is $595. The best round-trip flight deal from Washington, D.C. to Ko Samui found on momondo in the last 72 hours is $1,050.

The fastest flight from Washington, D.C. to Ko Samui takes 29h 00m

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

Frequently asked questions about flying from Washington, D.C. to Ko Samui

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 29h 00m.
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 Pha Ngan

Ko Tao

Khanom

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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.

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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.

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Cheap flights from Washington, D.C. to Ko Samui from $595

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 1/28. 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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EVA Air flights from Washington, D.C. to Ko Samui

Our best EVA Air deals on Washington, D.C. to Ko Samui flight tickets

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

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

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

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

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

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

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

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

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

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Frequently asked questions about flying from Washington, D.C. to Ko Samui

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List of cabin classes available on flights landing in Ko Samui. Availability may vary depending on flight origin and airline.

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