What are the cheapest airlines flying from Washington, D.C. to Ko Samui round-trip?

Currently priced at $1,441, Turkish Airlines will fly you from Washington, D.C. to Ko Samui and back. In addition to Turkish Airlines, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from Cathay Pacific and Singapore Airlines - these airlines can fly you to your destination from $1,789 and $1,945, respectively.

What are the most popular routes from Washington, D.C. to Ko Samui?

The most popular flight routes from Washington, D.C. to Ko Samui are Washington, D.C. Dulles Intl - Ko Samui, Washington, D.C. Reagan-National - Ko Samui and Baltimore/Washington - Ko Samui.

What is the cheapest day to fly round-trip from Washington, D.C. to Ko Samui?

Flights from Washington, D.C. to Ko Samui are found to be more expensive on Saturday. This shouldn't discourage you from searching as you can still find great deals by being flexible with your options. Use our search form to find deals on tickets to Ko Samui.

Most accurate provider : When it comes to deals on Washington, D.C.-Ko Samui flights, users find the pricing of AranGrant to be most consistent on Cheapflights vs. AranGrant Users can find the same prices on Washington, D.C.-Ko Samui flight deals on Cheapflights vs. AranGrant >95% of the time. Price accuracy is based on data collected from Washington, D.C.-Ko Samui flight searches over the past month and is updated monthly.

Most trusted provider : When it comes to deals on Washington, D.C.-Ko Samui flights, Cheapflights users trust AranGrant the most. AranGrant has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Washington, D.C.-Ko Samui flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

What airport do you fly into for flights to Ko Samui from Washington, D.C.?

For a flight from Washington, D.C. to Ko Samui, you will be flying into Ko Samui. Ko Samui (USM) is just 2.1 mi from the center of the city. Ko Samui is the only Ko Samui airport and it handles 0 inbound flights from Washington, D.C. per day. 0 airlines have flights to Ko Samui from Washington, D.C. on a regular basis.

Can I find deals for flights from Washington, D.C. to Ko Samui that include hotel bookings?

Yes. In addition to deals on Washington, D.C. to Ko Samui flights, Cheapflights offers vacation packages that include both flights and hotel.

How can I find direct flights from Washington, D.C. to Ko Samui?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Washington, D.C. to Ko Samui.

Can I find deals for business class flights from Washington, D.C. to Ko Samui?

Yes. Cheapflights offers flight deals from Washington, D.C. to Ko Samui by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

$708+ Flights from Washington, D.C. to Ko Samui - Compare & Save Big

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Cheap flight deals from Washington, D.C. to Ko Samui

Most accurate provider	AranGrant 3 stars
Most trusted provider	AranGrant 3 stars
Round-trip from	$1,441 (FlightHub)
One-way from	$1,001 (FlightHub)

Provider with most accurate pricing for Washington, D.C. (WAS)-Ko Samui flight deals.

Search Deals

Provider most trusted by Cheapflights users for Washington, D.C. (WAS)-Ko Samui flights.

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From Washington, D.C. (WAS) to Ko Samui

Search Deals

One-way flight from Washington, D.C. (WAS) to Ko Samui

Search Deals

Find flight deals from Washington, D.C. to Ko Samui

Cheapest flights from Washington, D.C. to Ko Samui
Explore the most affordable flight options available from Washington, D.C. to Ko Samui. Find the lowest fares from popular airlines and budget airlines, with prices last updated on May 1, 2025.

Sun 11/3010:40 amIAD - USM

2 stops32h 30mMultiple Airlines

Mon 12/87:00 amUSM - IAD

2 stops61h 20mMultiple Airlines

Deal found 4/28

$1,228

Wed 10/19:40 pmIAD - USM

2 stops23h 55mTurkish Airlines

Fri 10/312:05 pmUSM - IAD

2 stops33h 10mTurkish Airlines

Deal found 4/29

$1,252

Sat 11/298:05 pmIAD - USM

2 stops30h 50mQatar Airways

Mon 1/264:30 pmUSM - IAD

2 stops35h 25mQatar Airways

Deal found 4/30

$1,363

Sat 11/2910:30 amIAD - USM

2 stops43h 00mEmirates

Fri 1/309:20 amUSM - IAD

2 stops34h 50mEmirates

Deal found 4/30

$1,527

Sun 8/246:30 amDCA - USM

2 stops49h 05mCathay Pacific

Sun 8/3110:55 amUSM - DCA

2 stops44h 21mCathay Pacific

Deal found 4/30

$1,789

Wed 10/17:28 pmBWI - USM

2 stops38h 42mSingapore Airlines

Fri 10/311:25 pmUSM - BWI

2 stops38h 22mSingapore Airlines

Deal found 4/30

$1,908

Wed 10/18:59 amDCA - USM

3 stops46h 16mSingapore Airlines

Fri 10/311:25 pmUSM - DCA

2 stops42h 30mSingapore Airlines

Deal found 4/30

$1,945

Sun 8/249:20 pmBWI - USM

2 stops33h 55mBritish Airways

Sun 8/314:25 pmUSM - BWI

2 stops38h 10mBritish Airways

Deal found 4/30

$2,688

Sat 6/1411:26 amBWI - USM

2 stops44h 09mCathay Pacific

Sat 6/2110:55 amUSM - BWI

2 stops47h 58mCathay Pacific

Deal found 4/30

$2,828

Sat 6/148:30 pmBWI - USM

3 stops35h 00mMultiple Airlines

Sat 6/219:30 amUSM - BWI

3 stops44h 59mMultiple Airlines

Deal found 4/30

$3,048

Fri 6/139:40 amDCA - USM

3 stops35h 10mMultiple Airlines

Fri 6/205:40 pmUSM - DCA

3 stops33h 08mMultiple Airlines

Deal found 4/29

$3,107

Tue 6/37:25 pmIAD - USM

3 stops59h 50mSingapore Airlines

Wed 6/114:25 pmUSM - IAD

3 stops59h 00mSingapore Airlines

Deal found 4/29

$4,270

Best flights from Washington, D.C. to Ko Samui
Discover carefully curated flight deals from Washington, D.C. to Ko Samui that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated May 1, 2025.

Tue 5/201:30 pmIAD - USM

2 stops31h 45mTurkish Airlines

Tue 5/277:10 pmUSM - IAD

2 stops27h 35mTurkish Airlines

Deal found 4/29

$1,441

Tue 6/31:30 pmIAD - USM

2 stops44h 40mMultiple Airlines

Fri 6/65:50 pmUSM - IAD

2 stops28h 55mMultiple Airlines

Deal found 4/30

$1,552

Sun 8/246:30 amDCA - USM

2 stops49h 05mCathay Pacific

Sun 8/3110:55 amUSM - DCA

2 stops44h 21mCathay Pacific

Deal found 4/30

$1,789

Wed 10/18:59 amDCA - USM

3 stops46h 16mSingapore Airlines

Fri 10/311:25 pmUSM - DCA

2 stops42h 30mSingapore Airlines

Deal found 4/30

$1,945

Sat 6/1410:55 amIAD - USM

2 stops47h 15mEmirates

Sat 6/218:00 amUSM - IAD

2 stops35h 40mEmirates

Deal found 4/30

$2,708

Fri 6/139:20 pmBWI - USM

2 stops36h 50mBritish Airways

Fri 6/201:30 pmUSM - BWI

2 stops41h 05mBritish Airways

Deal found 4/29

$2,814

Sun 6/158:40 pmDCA - USM

3 stops34h 50mMultiple Airlines

Sun 6/228:50 pmUSM - DCA

3 stops35h 58mMultiple Airlines

Deal found 5/1

$2,561

Sat 6/1411:26 amBWI - USM

2 stops44h 09mCathay Pacific

Sat 6/2110:55 amUSM - BWI

2 stops47h 58mCathay Pacific

Deal found 4/30

$2,828

Tue 6/39:20 pmBWI - USM

2 stops33h 55mMultiple Airlines

Wed 6/114:25 pmUSM - BWI

2 stops38h 10mMultiple Airlines

Deal found 4/29

$2,759

Tue 6/36:00 pmBWI - USM

3 stops61h 15mSingapore Airlines

Wed 6/111:30 pmUSM - BWI

2 stops38h 24mSingapore Airlines

Deal found 4/30

$3,267

Tue 6/37:25 pmIAD - USM

3 stops59h 50mSingapore Airlines

Wed 6/114:25 pmUSM - IAD

3 stops59h 00mSingapore Airlines

Deal found 4/29

$4,270

Last-minute flights from Washington, D.C. to Ko Samui
Discover last-minute flight deals from Washington, D.C. to Ko Samui. Data last updated May 1, 2025 and is based on user searches.

Tue 5/201:30 pmIAD - USM

2 stops31h 45mTurkish Airlines

Tue 5/277:10 pmUSM - IAD

2 stops27h 35mTurkish Airlines

Deal found 4/29

$1,441

Tue 5/2010:55 amIAD - USM

2 stops41h 15mMultiple Airlines

Tue 5/277:10 pmUSM - IAD

3 stops35h 55mMultiple Airlines

Deal found 4/29

$1,654

One-way flights from Washington, D.C. to Ko Samui
Search for one-way flight options from Washington, D.C. to Ko Samui. Find affordable one-way fares based on user searches. Data last updated May 1, 2025.

Thu 8/149:59 amDCA - USM

2 stops48h 16mSingapore Airlines

Deal found 4/30

$1,001

Thu 8/146:02 pmBWI - USM

2 stops40h 13mSingapore Airlines

Deal found 4/30

$1,145

Cheapflights 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

Wed 10/1

9:40 pm-8:35 am

2 stops23h 55m

Ko Samui

Fri 10/31

2:05 pm-12:15 pm

2 stops33h 10m

$1,252

Washington, D.C.Ko Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

Sun 8/24

9:40 pm-11:40 am

2 stops27h 00m

Ko Samui

Sun 8/31

4:25 pm-11:45 am

2 stops30h 20m

$1,412

Washington, D.C.Ko Samui

DCA - USM

DCAUSM

Washington, D.C. Reagan-National

Sun 8/24

6:30 am-6:35 pm

2 stops49h 05m

Ko Samui

Sun 8/31

10:55 am-8:16 pm

2 stops44h 21m

$1,789

BaltimoreKo Samui

BWI - USM

BWIUSM

Baltimore/Washington

Wed 10/1

7:28 pm-9:10 pm

2 stops38h 42m

Ko Samui

Fri 10/31

1:25 pm-4:47 pm

2 stops38h 22m

$1,908

Washington, D.C.Ko Samui

DCA - USM

DCAUSM

Washington, D.C. Reagan-National

Wed 10/1

8:59 am-6:15 pm

3 stops46h 16m

Ko Samui

Fri 10/31

1:25 pm-8:55 pm

2 stops42h 30m

$1,945

BaltimoreKo Samui

BWI - USM

BWIUSM

Baltimore/Washington

Sun 8/24

9:20 pm-6:15 pm

2 stops33h 55m

Ko Samui

Sun 8/31

4:25 pm-7:35 pm

2 stops38h 10m

$2,688

Washington, D.C.Ko Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

Sat 6/14

10:55 am-9:10 pm

2 stops47h 15m

Ko Samui

Sat 6/21

8:00 am-8:40 am

2 stops35h 40m

$2,708

BaltimoreKo Samui

BWI - USM

BWIUSM

Baltimore/Washington

Tue 6/3

9:20 pm-6:15 pm

2 stops33h 55m

Ko Samui

Wed 6/11

4:25 pm-7:35 pm

2 stops38h 10m

$2,759

BaltimoreKo Samui

BWI - USM

BWIUSM

Baltimore/Washington

Sat 6/14

11:26 am-6:35 pm

2 stops44h 09m

Ko Samui

Sat 6/21

10:55 am-11:53 pm

2 stops47h 58m

$2,828

Washington, D.C.Ko Samui

DCA - USM

DCAUSM

Washington, D.C. Reagan-National

Fri 6/13

9:40 am-7:50 am

3 stops35h 10m

Ko Samui

Fri 6/20

5:40 pm-3:48 pm

3 stops33h 08m

$3,107

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/28

Showing 1-10 of 15 results

Compare providers for flights from Washington, D.C. to Ko Samui

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Washington, D.C. to Ko Samui in May.

Provider	Price Accuracy	Trust Score*
FlightHub	Price Accuracy3 stars	Trust Score*2 stars
eDreams	Price Accuracy3 stars	Trust Score*3 stars
AranGrant	Price Accuracy3 stars	Trust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

Most accurate provider: When it comes to deals on Washington, D.C.-Ko Samui flights, users find the pricing of AranGrant to be most consistent on Cheapflights vs. AranGrant Users can find the same prices on Washington, D.C.-Ko Samui flight deals on Cheapflights vs. AranGrant >95% of the time. Price accuracy is based on data collected from Washington, D.C.-Ko Samui flight searches over the past month and is updated monthly.
Most trusted provider: When it comes to deals on Washington, D.C.-Ko Samui flights, Cheapflights users trust AranGrant the most. AranGrant has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Washington, D.C.-Ko Samui flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Washington, D.C. to Ko Samui

Have a flexible travel schedule? Discover the best time to fly to Ko Samui from Washington, D.C. with our price prediction graph.

Estimated round-trip price

Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Washington, D.C. to Ko Samui

What is the cheapest time of day to fly from WAS to USM?

One of the essential ways to save on airfare from Washington, D.C. to Ko Samui is to remain as flexible as possible. Flights that are at noon tend to be the most expensive. A flight in the evening could potentially save you up to 29% on airfare.

What is the cheapest day to fly from Washington, D.C. to Ko Samui?

Travelers seeking maximum savings on their Washington, D.C. to Ko Samui flight should consider departing on Tuesday mornings when fares are most often at their lowest. Sunday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

Rainfall in Ko Samui by month

In terms of precipitation, rainfall in Ko Samui ranges from 2.3 - 19.3 inches per month. November is typically the wettest month, when rainfall can reach 19.3 in. February is typically the driest time to visit Ko Samui when rainfall is around 2.3 in.

Temperature in Ko Samui by month

If weather is an important factor for your trip to Ko Samui, use this chart to help with planning. For those seeking warmer temperatures, April is the ideal time of year to visit, when temperatures reach an average of 84.2 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 80.6 F).

Reviews of airlines servicing Ko Samui

To help decide which airline to fly from Washington, D.C. to Ko Samui, see what other customers have to say about Singapore Airlines, Emirates and Cathay Pacific. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.

Singapore Airlines

8.1

Very good

1,292 reviews

Reviews

1 / 20

6.0

Good

Pierre,Apr 2025

MLE - SIN

3 boarding pass checkpoints at the gate. Long line before boarding. Poor leg room in economy.. Flight crew rounds practically non existent during flight.

Singapore Airlines

8.1

Very good

1,292 reviews

Singapore Airlines

8.1

Very good

1,292 reviews

Reviews

1 / 20

6.0

Good

Pierre,Apr 2025

MLE - SIN

3 boarding pass checkpoints at the gate. Long line before boarding. Poor leg room in economy.. Flight crew rounds practically non existent during flight.

Emirates

8.0

Very good

3,216 reviews

Singapore Airlines

8.1

Very good

1,292 reviews

Reviews

1 / 20

6.0

Good

Pierre,Apr 2025

MLE - SIN

3 boarding pass checkpoints at the gate. Long line before boarding. Poor leg room in economy.. Flight crew rounds practically non existent during flight.

Cathay Pacific

7.5

Good

855 reviews

Singapore Airlines

8.1

Very good

1,292 reviews

Reviews

1 / 20

6.0

Good

Pierre,Apr 2025

MLE - SIN

3 boarding pass checkpoints at the gate. Long line before boarding. Poor leg room in economy.. Flight crew rounds practically non existent during flight.

Turkish Airlines

7.3

Good

3,790 reviews

Singapore Airlines

8.1

Very good

1,292 reviews

Reviews

1 / 20

6.0

Good

Pierre,Apr 2025

MLE - SIN

3 boarding pass checkpoints at the gate. Long line before boarding. Poor leg room in economy.. Flight crew rounds practically non existent during flight.

British Airways

6.6

Okay

6,845 reviews

Singapore Airlines

8.1

Very good

1,292 reviews

Reviews

1 / 20

6.0

Good

Pierre,Apr 2025

MLE - SIN

3 boarding pass checkpoints at the gate. Long line before boarding. Poor leg room in economy.. Flight crew rounds practically non existent during flight.

Related info for your journey

What airport do you fly into for flights to Ko Samui from Washington, D.C.?
For a flight from Washington, D.C. to Ko Samui, you will be flying into Ko Samui. Ko Samui (USM) is just 2.1 mi from the center of the city. Ko Samui is the only Ko Samui airport and it handles 0 inbound flights from Washington, D.C. per day. 0 airlines have flights to Ko Samui from Washington, D.C. on a regular basis.
What are the cheapest airlines flying from Washington, D.C. to Ko Samui round-trip?
Currently priced at $1,441, Turkish Airlines will fly you from Washington, D.C. to Ko Samui and back. In addition to Turkish Airlines, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from Cathay Pacific and Singapore Airlines - these airlines can fly you to your destination from $1,789 and $1,945, respectively.
What are the most popular routes from Washington, D.C. to Ko Samui?
The most popular flight routes from Washington, D.C. to Ko Samui are Washington, D.C. Dulles Intl - Ko Samui, Washington, D.C. Reagan-National - Ko Samui and Baltimore/Washington - Ko Samui.
Can I find deals for flights from Washington, D.C. to Ko Samui that include hotel bookings?
Yes. In addition to deals on Washington, D.C. to Ko Samui flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Washington, D.C. to Ko Samui?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Washington, D.C. to Ko Samui.
Can I find deals for business class flights from Washington, D.C. to Ko Samui?
Yes. Cheapflights offers flight deals from Washington, D.C. to Ko Samui by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

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Ko Pha Ngan

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$708+ Cheap flights from Washington, D.C. (WAS) to Ko Samui (USM)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 8/14. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Washington, D.C. to Ko Samui with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheap flight deals from Washington, D.C. to Ko Samui

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Most trusted provider

Round-trip from

One-way from

Find flight deals from Washington, D.C. to Ko Samui

Cheapest flights from Washington, D.C. to Ko SamuiExplore the most affordable flight options available from Washington, D.C. to Ko Samui. Find the lowest fares from popular airlines and budget airlines, with prices last updated on May 1, 2025.

Explore the most affordable flight options available from Washington, D.C. to Ko Samui. Find the lowest fares from popular airlines and budget airlines, with prices last updated on May 1, 2025.

Cheapflights Fare Finder

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

Compare providers for flights from Washington, D.C. to Ko Samui

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Washington, D.C. to Ko Samui in May.

Best time to book a flight from Washington, D.C. to Ko Samui

Have a flexible travel schedule? Discover the best time to fly to Ko Samui from Washington, D.C. with our price prediction graph.

Cheapflights Insights

Everything you need to know about your flight from Washington, D.C. to Ko Samui

What is the cheapest time of day to fly from WAS to USM?

Find hourly flight availability from Washington, D.C. to Ko Samui. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated May 1, 2025.

What is the cheapest day to fly from Washington, D.C. to Ko Samui?

Use this chart to determine the cheapest time to fly round-trip from Washington, D.C. to Ko Samui. Price data was last updated on March 30, 2025.

Rainfall in Ko Samui by month

Plan your trip to Ko Samui by taking into account the average rainfall totals by month.

Temperature in Ko Samui by month

Plan your trip to Ko Samui by taking into account the average temperature totals by month.

Reviews of airlines servicing Ko Samui

To help decide which airline to fly from Washington, D.C. to Ko Samui, see what other customers have to say about Singapore Airlines, Emirates and Cathay Pacific. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

Find useful and relevant information for your journey from Washington, D.C. to Ko Samui. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

What airport do you fly into for flights to Ko Samui from Washington, D.C.?

What are the cheapest airlines flying from Washington, D.C. to Ko Samui round-trip?

What are the most popular routes from Washington, D.C. to Ko Samui?

Can I find deals for flights from Washington, D.C. to Ko Samui that include hotel bookings?

How can I find direct flights from Washington, D.C. to Ko Samui?

Can I find deals for business class flights from Washington, D.C. to Ko Samui?

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Alternative routes for Washington, D.C. to Ko Samui

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Cheapest flights from Washington, D.C. to Ko Samui
Explore the most affordable flight options available from Washington, D.C. to Ko Samui. Find the lowest fares from popular airlines and budget airlines, with prices last updated on May 1, 2025.