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$1,051+ 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.
WAS — USM
Apr 27 — May 41
Sun 4/27
Sun 5/4
1 adult, Economy
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Cheap flight deals from Washington, D.C. to Ko Samui

Discover tips and strategies to find the most affordable flight options for your journey from Washington, D.C. (WAS) to Ko Samui (USM). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated April 22, 2025.

Most accurate provider

AranGrant
3 stars

Most trusted provider

AranGrant
3 stars

Round-trip from

$1,252
(FlightHub)

One-way from

$1,051
(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
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One-way flight from Washington, D.C. (WAS) to Ko Samui
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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 April 22, 2025.

This FlightHub deal was found by Cheapflights users on 4/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/19:40 pmIAD - USM
2 stops23h 35mTurkish Airlines
Sun 9/79:00 pmUSM - IAD
2 stops33h 45mTurkish Airlines
Deal found 4/20$1,253
This Mytrip deal was found by Cheapflights users on 4/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/136:26 amBWI - USM
3 stops38h 24mMultiple Airlines
Tue 9/236:25 pmUSM - BWI
3 stops37h 37mMultiple Airlines
Deal found 4/21$1,467
This Mytrip deal was found by Cheapflights users on 4/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/1311:00 amIAD - USM
3 stops33h 50mMultiple Airlines
Tue 9/239:00 pmUSM - IAD
3 stops35h 05mMultiple Airlines
Deal found 4/21$1,504
This KAYAK deal was found by Cheapflights users on 4/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/298:05 pmIAD - USM
2 stops31h 30mQatar Airways
Fri 1/306:15 pmUSM - IAD
2 stops50h 05mQatar Airways
Deal found 4/21$1,567
This Travelocity deal was found by Cheapflights users on 4/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/246:59 pmDCA - USM
2 stops60h 16mMultiple Airlines
Sun 8/311:30 pmUSM - DCA
2 stops63h 29mMultiple Airlines
Deal found 4/21$1,695
This Gurufare deal was found by Cheapflights users on 4/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/16:59 amDCA - USM
2 stops24h 36mCathay Pacific
Sun 9/710:55 amUSM - DCA
2 stops40h 24mCathay Pacific
Deal found 4/20$1,697
This Singapore Airlines deal was found by Cheapflights users on 4/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Singapore Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/67:28 pmBWI - USM
2 stops35h 47mSingapore Airlines
Fri 10/101:30 pmUSM - BWI
2 stops29h 36mSingapore Airlines
Deal found 4/21$1,792
This Gurufare deal was found by Cheapflights users on 4/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/612:58 pmBWI - USM
3 stops31h 22mCathay Pacific
Fri 10/1010:55 amUSM - BWI
2 stops46h 22mCathay Pacific
Deal found 4/21$1,986
This Gurufare deal was found by Cheapflights users on 4/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/19:00 amDCA - USM
2 stops46h 15mSingapore Airlines
Fri 10/311:25 pmUSM - DCA
2 stops42h 30mSingapore Airlines
Deal found 4/21$2,032
This British Airways deal was found by Cheapflights users on 4/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/298:30 pmBWI - USM
2 stops33h 45mBritish Airways
Tue 2/104:25 pmUSM - BWI
2 stops38h 20mBritish Airways
Deal found 4/22$2,358

Cheapflights Fare Finder

Customize your flight search to find flights from Washington, D.C. to Ko Samui that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated April 22, 2025.
Use the filters below to find and compare flights from Washington, D.C. to Ko Samui that are best for you.

Fly from

Washington, D.C.

Fly to

Ko Samui

Route

Depart

Return

Price

Washington, D.C.Ko Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

Tue 5/20

9:40 pm-10:45 am

2 stops26h 05m

Ko Samui

Tue 5/27

6:55 pm-11:45 am

2 stops27h 50m

$1,442

Washington, D.C.Ko Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

Thu 6/5

1:30 pm-9:35 pm

2 stops45h 05m

Ko Samui

Thu 6/12

7:00 am-11:45 am

2 stops39h 45m

$1,529

Washington, D.C.Ko Samui

DCA - USM

DCAUSM

Washington, D.C. Reagan-National

Sun 8/24

6:59 pm-6:15 pm

2 stops60h 16m

Ko Samui

Sun 8/31

1:30 pm-5:59 pm

2 stops63h 29m

$1,695

Washington, D.C.Ko Samui

DCA - USM

DCAUSM

Washington, D.C. Reagan-National

Mon 9/1

6:59 am-6:35 pm

2 stops24h 36m

Ko Samui

Sun 9/7

10:55 am-4:19 pm

2 stops40h 24m

$1,697

Washington, D.C.Ko Samui

DCA - USM

DCAUSM

Washington, D.C. Reagan-National

Wed 10/1

9:00 am-6:15 pm

2 stops46h 15m

Ko Samui

Fri 10/31

1:25 pm-8:55 pm

2 stops42h 30m

$2,032

BaltimoreKo Samui

BWI - USM

BWIUSM

Baltimore/Washington

Thu 6/5

8:30 pm-6:30 pm

3 stops35h 00m

Ko Samui

Thu 6/12

7:30 pm-7:28 pm

3 stops34h 58m

$2,153

BaltimoreKo Samui

BWI - USM

BWIUSM

Baltimore/Washington

Tue 7/1

9:20 pm-9:10 pm

2 stops36h 50m

Ko Samui

Tue 7/8

4:25 pm-7:35 pm

2 stops38h 10m

$2,704

BaltimoreKo Samui

BWI - USM

BWIUSM

Baltimore/Washington

Tue 7/1

6:02 pm-6:15 pm

3 stops61h 13m

Ko Samui

Tue 7/8

1:30 pm-4:55 pm

2 stops38h 25m

$3,296

Washington, D.C.Ko Samui

DCA - USM

DCAUSM

Washington, D.C. Reagan-National

Thu 8/14

9:59 am-9:15 pm

2 stops48h 16m

$1,051

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/21

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 April.
ProviderPrice AccuracyTrust Score*
FlightHubPrice Accuracy3 starsTrust Score*2 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy3 starsTrust 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?

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 April 22, 2025.

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?

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.

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

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

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

Get insights into the airlines that provide service to Ko Samui. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Ko Samui. Reviews last updated April 22, 2025.
Singapore Airlines
8.1
Very good
1,290 reviews

Food

7.7

Comfort

7.9

Crew

8.6

Boarding

8.2

Entertainment

8.0

Overall

8.1

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
1,290 reviews
Singapore Airlines
8.1
Very good
1,290 reviews

Food

7.7

Comfort

7.9

Crew

8.6

Boarding

8.2

Entertainment

8.0

Overall

8.1

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
850 reviews
Singapore Airlines
8.1
Very good
1,290 reviews

Food

7.7

Comfort

7.9

Crew

8.6

Boarding

8.2

Entertainment

8.0

Overall

8.1

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
3,773 reviews
Singapore Airlines
8.1
Very good
1,290 reviews

Food

7.7

Comfort

7.9

Crew

8.6

Boarding

8.2

Entertainment

8.0

Overall

8.1

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
6,794 reviews
Singapore Airlines
8.1
Very good
1,290 reviews

Food

7.7

Comfort

7.9

Crew

8.6

Boarding

8.2

Entertainment

8.0

Overall

8.1

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

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.?

    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 $1,252, 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 Singapore Airlines and Cathay Pacific - these airlines can fly you to your destination from $2,032 and $2,102, 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.

See more FAQs

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Ko Tao
Ko Pha Ngan

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