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

According to our current data, Qatar Airways ($1,325), Cathay Pacific ($1,771), and Singapore Airlines ($2,399) offers the cheapest pricing from Washington, D.C. to Koh Samui.

What are the cheapest airlines to fly from Washington, D.C. to Koh Samui one-way?

$731 is the cheapest one-way deal found within the past few days, from Qatar Airways. You may also be able to find cheap deals on Cathay Pacific and Singapore Airlines, with prices starting from $955 and $1,184, respectively.

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

The most popular flight routes from Washington, D.C. to Koh 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 Koh Samui?

Flights from Washington, D.C. to Koh 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 Koh Samui.

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

Most trusted provider : When it comes to deals on Washington, D.C.-Koh Samui flights, Cheapflights users trust FlightHub the most. FlightHub 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.-Koh 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 Koh Samui from Washington, D.C.?

For a flight from Washington, D.C. to Koh 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 Koh 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 Koh Samui that include hotel bookings?

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

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

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

Yes. Cheapflights offers flight deals from Washington, D.C. to Koh 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.

$608+ Flights from Washington, D.C. to Koh Samui

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1. Tell us where you want to go

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

Most accurate provider	FlightHub 3 stars
Most trusted provider	FlightHub 3 stars
Round-trip from	$1,319 (oojo)
One-way from	$608 (Kiwi.com)

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 Koh Samui

Cheapest flights from Washington, D.C. to Koh Samui
Explore the most affordable flight options available from Washington, D.C. to Koh Samui. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 22, 2025.

Wed 2/2610:35 amIAD - USM

2 stops43h 40mMultiple Airlines

Wed 4/27:00 pmUSM - IAD

2 stops31h 40mMultiple Airlines

Deal found 2/22

$1,319

Mon 4/79:00 pmIAD - USM

2 stops26h 30mQatar Airways

Mon 4/147:00 pmUSM - IAD

2 stops31h 40mQatar Airways

Deal found 2/21

$1,325

Sun 6/812:30 pmIAD - USM

2 stops45h 00mTurkish Airlines

Fri 6/206:25 pmUSM - IAD

2 stops27h 20mTurkish Airlines

Deal found 2/21

$1,470

Mon 5/126:33 amDCA - USM

2 stops25h 02mCathay Pacific

Mon 5/1910:55 amUSM - DCA

2 stops33h 34mCathay Pacific

Deal found 2/22

$1,756

Fri 8/225:00 pmIAD - USM

3 stops62h 15mSingapore Airlines

Wed 8/271:30 pmUSM - IAD

2 stops60h 30mSingapore Airlines

Deal found 2/20

$1,972

Mon 4/710:59 amBWI - USM

2 stops44h 36mCathay Pacific

Mon 4/1410:55 amUSM - BWI

2 stops45h 54mCathay Pacific

Deal found 2/21

$1,981

Wed 4/96:35 amDCA - USM

2 stops25h 00mMultiple Airlines

Wed 4/168:00 amUSM - DCA

3 stops36h 29mMultiple Airlines

Deal found 2/22

$2,075

Fri 8/225:50 pmBWI - USM

2 stops37h 25mSingapore Airlines

Wed 8/271:30 pmUSM - BWI

2 stops38h 17mSingapore Airlines

Deal found 2/20

$2,138

Tue 3/259:00 amDCA - USM

3 stops46h 15mSingapore Airlines

Wed 4/301:30 pmUSM - DCA

2 stops42h 28mSingapore Airlines

Deal found 2/22

$2,399

Thu 3/209:30 pmBWI - USM

2 stops33h 45mBritish Airways

Wed 3/261:25 pmUSM - BWI

2 stops41h 20mBritish Airways

Deal found 2/20

$2,500

Best flights from Washington, D.C. to Koh Samui
Discover carefully curated flight deals from Washington, D.C. to Koh Samui that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated February 22, 2025.

Wed 2/2610:35 amIAD - USM

2 stops43h 40mMultiple Airlines

Wed 4/27:00 pmUSM - IAD

2 stops31h 40mMultiple Airlines

Deal found 2/22

$1,319

Mon 4/79:00 pmIAD - USM

2 stops26h 30mQatar Airways

Mon 4/147:00 pmUSM - IAD

2 stops31h 40mQatar Airways

Deal found 2/21

$1,325

Wed 2/269:29 amDCA - USM

2 stops46h 06mCathay Pacific

Wed 4/210:55 amUSM - DCA

2 stops40h 21mCathay Pacific

Deal found 2/22

$1,771

Tue 3/259:00 amDCA - USM

3 stops46h 15mSingapore Airlines

Wed 4/301:30 pmUSM - DCA

2 stops42h 28mSingapore Airlines

Deal found 2/22

$2,399

Wed 2/268:30 pmBWI - USM

2 stops33h 45mBritish Airways

Wed 4/21:30 pmUSM - BWI

2 stops41h 05mBritish Airways

Deal found 2/22

$2,895

Tue 3/256:35 amBWI - USM

3 stops48h 40mSingapore Airlines

Wed 4/301:30 pmUSM - BWI

2 stops39h 29mSingapore Airlines

Deal found 2/22

$2,546

Last-minute flights from Washington, D.C. to Koh Samui
Discover last-minute flight deals from Washington, D.C. to Koh Samui. Data last updated February 22, 2025 and is based on user searches.

Wed 2/2610:35 amIAD - USM

2 stops43h 40mMultiple Airlines

Wed 4/27:00 pmUSM - IAD

2 stops31h 40mMultiple Airlines

Deal found 2/22

$1,319

Wed 2/269:29 amDCA - USM

2 stops46h 06mCathay Pacific

Wed 4/210:55 amUSM - DCA

2 stops40h 21mCathay Pacific

Deal found 2/22

$1,771

Thu 3/209:30 pmBWI - USM

2 stops33h 45mBritish Airways

Wed 3/261:25 pmUSM - BWI

2 stops41h 20mBritish Airways

Deal found 2/20

$2,500

Fri 3/219:05 pmIAD - USM

2 stops36h 45mQatar Airways

Fri 4/252:30 pmUSM - IAD

2 stops36h 10mQatar Airways

Deal found 2/22

$1,540

Tue 3/259:00 amDCA - USM

3 stops46h 15mSingapore Airlines

Wed 4/301:30 pmUSM - DCA

2 stops42h 28mSingapore Airlines

Deal found 2/22

$2,399

Tue 3/256:35 amBWI - USM

3 stops48h 40mSingapore Airlines

Wed 4/301:30 pmUSM - BWI

2 stops39h 29mSingapore Airlines

Deal found 2/22

$2,546

One-way flights from Washington, D.C. to Koh Samui
Search for one-way flight options from Washington, D.C. to Koh Samui. Find affordable one-way fares based on user searches. Data last updated February 22, 2025.

Wed 2/269:30 pmIAD - USM

3 stops59h 20mMultiple Airlines

Deal found 2/21

$608

Sat 3/18:55 pmBWI - USM

3 stops46h 50mMultiple Airlines

Deal found 2/22

$711

Wed 2/268:05 pmIAD - USM

2 stops35h 30mQatar Airways

Deal found 2/21

$731

Wed 2/269:00 amDCA - USM

3 stops35h 20mMultiple Airlines

Deal found 2/22

$732

Wed 2/269:29 amDCA - USM

2 stops46h 06mCathay Pacific

Deal found 2/22

$955

Tue 2/259:00 amDCA - USM

2 stops45h 15mSingapore Airlines

Deal found 2/22

$1,184

Wed 2/267:05 pmDCA - USM

3 stops32h 35mQatar Airways

Deal found 2/22

$1,213

Tue 2/258:30 amBWI - USM

2 stops45h 45mSingapore Airlines

Deal found 2/22

$1,284

Thu 2/272:00 pmIAD - USM

2 stops42h 45mTurkish Airlines

Deal found 2/21

$1,767

Thu 2/278:30 pmBWI - USM

2 stops36h 15mBritish Airways

Deal found 2/22

$6,064

Find flights from Washington, D.C. to Koh Samui within your budget

Fly from

Fly to

Route

Depart

Return

Price

Washington, D.C.Koh Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

Wed 2/26

10:35 am-6:15 pm

2 stops43h 40m

Ko Samui

Wed 4/2

7:00 pm-3:40 pm

2 stops31h 40m

$1,319

Washington, D.C.Koh Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

Mon 4/7

9:00 pm-10:30 am

2 stops26h 30m

Ko Samui

Mon 4/14

7:00 pm-3:40 pm

2 stops31h 40m

$1,325

Washington, D.C.Koh Samui

DCA - USM

DCAUSM

Washington, D.C. Reagan-National

Mon 5/12

6:33 am-6:35 pm

2 stops25h 02m

Ko Samui

Mon 5/19

10:55 am-9:29 am

2 stops33h 34m

$1,756

BaltimoreKoh Samui

BWI - USM

BWIUSM

Baltimore/Washington

Mon 4/7

10:59 am-6:35 pm

2 stops44h 36m

Ko Samui

Mon 4/14

10:55 am-9:49 pm

2 stops45h 54m

$1,981

Washington, D.C.Koh Samui

DCA - USM

DCAUSM

Washington, D.C. Reagan-National

Wed 4/9

6:35 am-6:35 pm

2 stops25h 00m

Ko Samui

Wed 4/16

8:00 am-9:29 am

3 stops36h 29m

$2,075

Washington, D.C.Koh Samui

DCA - USM

DCAUSM

Washington, D.C. Reagan-National

Tue 3/25

9:00 am-6:15 pm

3 stops46h 15m

Ko Samui

Wed 4/30

1:30 pm-8:58 pm

2 stops42h 28m

$2,399

BaltimoreKoh Samui

BWI - USM

BWIUSM

Baltimore/Washington

Thu 3/20

9:30 pm-6:15 pm

2 stops33h 45m

Ko Samui

Wed 3/26

1:25 pm-7:45 pm

2 stops41h 20m

$2,500

BaltimoreKoh Samui

BWI - USM

BWIUSM

Baltimore/Washington

Tue 3/25

6:35 am-6:15 pm

3 stops48h 40m

Ko Samui

Wed 4/30

1:30 pm-5:59 pm

2 stops39h 29m

$2,546

Washington, D.C.Koh Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

Wed 2/26

9:30 pm-8:50 pm

3 stops59h 20m

$608

BaltimoreKoh Samui

BWI - USM

BWIUSM

Baltimore/Washington

Sat 3/1

8:55 pm-7:45 am

3 stops46h 50m

$714

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/21

Showing 1-10 of 14 results

Compare providers for flights from Washington, D.C. to Koh 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 Koh Samui in February.

Provider	Price Accuracy	Trust Score*
FlightHub	Price Accuracy3 stars	Trust Score*3 stars
AranGrant	Price Accuracy3 stars	Trust Score*1 star

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

Have a flexible travel schedule? Discover the best time to fly to Koh 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.

Travel insights for flights from Washington, D.C. to Koh Samui

Get recent, data-driven insights about flights from Washington, D.C. to Koh Samui including ideal travel times, pricing trends, and more.

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 Koh Samui is to remain as flexible as possible. Flights that are in the morning tend to be the most expensive. A flight in the evening could potentially save you up to 32% on airfare.

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

Travelers seeking maximum savings on their Washington, D.C. to Koh 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 Koh Samui by month

In terms of precipitation, rainfall in Koh 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 Koh Samui when rainfall is around 2.3 in.

Temperature in Koh Samui by month

If weather is an important factor for your trip to Koh 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 Koh Samui

Singapore Airlines

8.1

Very good

1,297 reviews

Reviews

1 / 20

2.0

Mediocre

Ketan,Nov 2024

SEA - SIN

Sin to amd was not good flight. Food was bad. It was like few days old.

Singapore Airlines

8.1

Very good

1,297 reviews

Singapore Airlines

8.1

Very good

1,297 reviews

Reviews

1 / 20

2.0

Mediocre

Ketan,Nov 2024

SEA - SIN

Sin to amd was not good flight. Food was bad. It was like few days old.

Cathay Pacific

7.5

Good

822 reviews

Singapore Airlines

8.1

Very good

1,297 reviews

Reviews

1 / 20

2.0

Mediocre

Ketan,Nov 2024

SEA - SIN

Sin to amd was not good flight. Food was bad. It was like few days old.

Qatar Airways

7.4

Good

3,612 reviews

Singapore Airlines

8.1

Very good

1,297 reviews

Reviews

1 / 20

2.0

Mediocre

Ketan,Nov 2024

SEA - SIN

Sin to amd was not good flight. Food was bad. It was like few days old.

Turkish Airlines

7.3

Good

3,818 reviews

Singapore Airlines

8.1

Very good

1,297 reviews

Reviews

1 / 20

2.0

Mediocre

Ketan,Nov 2024

SEA - SIN

Sin to amd was not good flight. Food was bad. It was like few days old.

British Airways

6.6

Okay

6,754 reviews

Singapore Airlines

8.1

Very good

1,297 reviews

Reviews

1 / 20

2.0

Mediocre

Ketan,Nov 2024

SEA - SIN

Sin to amd was not good flight. Food was bad. It was like few days old.

Related info for your journey

What airport do you fly into for flights to Koh Samui from Washington, D.C.?
For a flight from Washington, D.C. to Koh 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 Koh 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 Koh Samui round-trip?
According to our current data, Qatar Airways ($1,325), Cathay Pacific ($1,771), and Singapore Airlines ($2,399) offers the cheapest pricing from Washington, D.C. to Koh Samui.
What are the cheapest airlines to fly from Washington, D.C. to Koh Samui one-way?
$731 is the cheapest one-way deal found within the past few days, from Qatar Airways. You may also be able to find cheap deals on Cathay Pacific and Singapore Airlines, with prices starting from $955 and $1,184, respectively.
What are the most popular routes from Washington, D.C. to Koh Samui?
The most popular flight routes from Washington, D.C. to Koh 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 Koh Samui that include hotel bookings?
Yes. In addition to deals on Washington, D.C. to Koh Samui flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Washington, D.C. to Koh 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 Koh Samui.
Can I find deals for business class flights from Washington, D.C. to Koh Samui?
Yes. Cheapflights offers flight deals from Washington, D.C. to Koh 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.

See more FAQs

Ko Pha Ngan

Ko Tao

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$608+ Cheap flights from Washington, D.C. (WAS) to Koh 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 2/26. 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 Koh 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 Koh Samui

Most accurate provider

Most trusted provider

Round-trip from

One-way from

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

Cheapest flights from Washington, D.C. to Koh SamuiExplore the most affordable flight options available from Washington, D.C. to Koh Samui. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 22, 2025.

Explore the most affordable flight options available from Washington, D.C. to Koh Samui. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 22, 2025.

Find flights from Washington, D.C. to Koh Samui within your budget

Compare providers for flights from Washington, D.C. to Koh 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 Koh Samui in February.

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

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

Travel insights for flights from Washington, D.C. to Koh Samui

Get recent, data-driven insights about flights from Washington, D.C. to Koh Samui including ideal travel times, pricing trends, and more.

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

Find hourly flight availability from Washington, D.C. to Koh Samui. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated February 22, 2025.

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

Use this chart to determine the cheapest time to fly round-trip from Washington, D.C. to Koh Samui. Price data was last updated on February 16, 2025.

Rainfall in Koh Samui by month

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

Temperature in Koh Samui by month

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

Reviews of airlines servicing Koh Samui

Related info for your journey

Find useful and relevant information for your journey from Washington, D.C. to Koh 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 Koh Samui from Washington, D.C.?

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

What are the cheapest airlines to fly from Washington, D.C. to Koh Samui one-way?

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

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

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

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

Traveling to a place near Washington, D.C.?

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

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Cheapest flights from Washington, D.C. to Koh Samui
Explore the most affordable flight options available from Washington, D.C. to Koh Samui. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 22, 2025.