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Ko Samui

$653+ 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 11/30. Fares are subject to change and may not be available on all flights or dates of travel.
WAS — USM
Oct 15 — Oct 221
Wed 10/15
Wed 10/22
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 September 15, 2025.

Round-trip from

$1,031
(FlightHub)

One-way from

$653
(KAYAK)
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 September 15, 2025.

This Trip.com deal was found by Cheapflights users on 9/14. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/156:55 pmIAD - USM
2 stops39h 15mMultiple Airlines
Mon 9/221:30 pmUSM - IAD
2 stops29h 38mMultiple Airlines
Deal found 9/14$921
This Trip.com deal was found by Cheapflights users on 9/14. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/157:00 amDCA - USM
2 stops27h 10mMultiple Airlines
Mon 9/224:25 pmUSM - DCA
2 stops40h 12mMultiple Airlines
Deal found 9/14$921
This FlightHub deal was found by Cheapflights users on 9/13. 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.
Wed 10/110:05 pmIAD - USM
2 stops25h 40mMultiple Airlines
Fri 10/315:05 pmUSM - IAD
2 stops34h 45mMultiple Airlines
Deal found 9/13$1,031
This oojo deal was found by Cheapflights users on 9/13. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/299:10 pmIAD - USM
2 stops24h 10mMultiple Airlines
Mon 1/267:35 pmUSM - IAD
2 stops32h 15mMultiple Airlines
Deal found 9/13$1,133
This Etihad Airways deal was found by Cheapflights users on 9/14. 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 Etihad Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/299:10 pmIAD - USM
2 stops23h 30mEtihad Airways
Mon 1/266:40 pmUSM - IAD
2 stops33h 10mEtihad Airways
Deal found 9/14$1,159
This oojo deal was found by Cheapflights users on 9/14. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/299:10 pmIAD - USM
2 stops23h 30mEtihad Airways
Sun 1/258:50 amUSM - IAD
2 stops67h 00mEtihad Airways
Deal found 9/14$1,166
This FlightHub deal was found by Cheapflights users on 9/15. 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.
Sat 11/291:30 pmIAD - USM
2 stops30h 40mTurkish Airlines
Sun 1/251:25 pmUSM - IAD
2 stops34h 20mTurkish Airlines
Deal found 9/15$1,176
This oojo deal was found by Cheapflights users on 9/14. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/2910:10 pmIAD - USM
2 stops51h 55mMultiple Airlines
Wed 11/57:00 pmUSM - IAD
2 stops28h 45mMultiple Airlines
Deal found 9/14$1,195
This oojo deal was found by Cheapflights users on 9/14. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/19:00 pmIAD - USM
2 stops26h 10mMultiple Airlines
Fri 10/107:15 pmUSM - IAD
2 stops31h 25mMultiple Airlines
Deal found 9/14$1,215
This Trip.com deal was found by Cheapflights users on 9/12. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/291:30 pmIAD - USM
2 stops29h 40mMultiple Airlines
Sat 12/69:10 pmUSM - IAD
2 stops34h 05mMultiple Airlines
Deal found 9/12$1,248
This Mytrip deal was found by Cheapflights users on 9/14. 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.
Wed 10/15:45 amBWI - USM
3 stops39h 05mMultiple Airlines
Fri 10/317:55 amUSM - BWI
3 stops33h 40mMultiple Airlines
Deal found 9/14$1,619
This Mytrip deal was found by Cheapflights users on 9/14. 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.
Wed 10/291:35 pmBWI - USM
3 stops31h 10mMultiple Airlines
Wed 11/57:55 amUSM - BWI
3 stops47h 24mMultiple Airlines
Deal found 9/14$1,804

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 September 15, 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

Wed 10/1

10:05 pm-10:45 am

2 stops25h 40m

Ko Samui

Fri 10/31

6:15 pm-4:50 pm

2 stops33h 35m

$1,078

Washington, D.C.Ko Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

Sat 11/29

9:10 pm-9:20 am

2 stops24h 10m

Ko Samui

Mon 1/26

7:35 pm-3:50 pm

2 stops32h 15m

$1,133

Washington, D.C.Ko Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

Sat 11/29

9:10 pm-8:40 am

2 stops23h 30m

Ko Samui

Mon 1/26

6:40 pm-3:50 pm

2 stops33h 10m

$1,159

Washington, D.C.Ko Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

Sat 11/29

9:10 pm-8:40 am

2 stops23h 30m

Ko Samui

Sun 1/25

8:50 am-3:50 pm

2 stops67h 00m

$1,166

Washington, D.C.Ko Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

Sat 11/29

1:30 pm-8:10 am

2 stops30h 40m

Ko Samui

Sun 1/25

1:25 pm-11:45 am

2 stops34h 20m

$1,176

Washington, D.C.Ko Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

Wed 10/29

10:10 pm-1:05 pm

2 stops51h 55m

Ko Samui

Wed 11/5

7:00 pm-11:45 am

2 stops28h 45m

$1,195

Washington, D.C.Ko Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

Sat 11/29

1:30 pm-7:10 am

2 stops29h 40m

Ko Samui

Sat 12/6

9:10 pm-7:15 pm

2 stops34h 05m

$1,248

Washington, D.C.Ko Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

Sat 11/29

1:30 pm-8:10 am

2 stops30h 40m

Ko Samui

Fri 1/30

1:25 pm-7:15 pm

2 stops41h 50m

$1,301

Washington, D.C.Ko Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

Thu 9/25

1:30 pm-8:35 am

2 stops32h 05m

Ko Samui

Mon 9/29

4:25 pm-11:45 am

2 stops30h 20m

$1,351

Washington, D.C.Ko Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

Thu 9/25

9:00 pm-10:10 am

2 stops26h 10m

Ko Samui

Mon 9/29

3:50 pm-3:40 pm

2 stops34h 50m

$1,369

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/13

Showing 1-10 of 36 results
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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 September 15, 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.

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.

  • How long is the flight from Washington, D.C. to Ko Samui?

    Etihad Airways, Turkish Airlines, and Singapore Airlines can get you from Washington, D.C. to Ko Samui in just under 23h 30m. Your travel time can differ by up to 21h 46m. There are 9076 mi between Washington, D.C. and Ko Samui. Both multi-stop and nonstop flights can be found to your destination and back.

  • 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, Baltimore/Washington - Ko Samui and Washington, D.C. Reagan-National - 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

Traveling to a place near Ko Samui?

Book flights to Ko Samui if you plan to visit one of these locations
Ko Tao
Ko Pha Ngan

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