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Ko Samui

$711+ Cheap flights from District of Columbia 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.
IAD — USM
Nov 18 — Nov 251
Tue 11/18
Tue 11/25
1 adult, Economy
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Cheap flight deals from District of Columbia to Ko Samui

Keep the following information in mind while searching for District of Columbia to Ko Samui flight deals. Data was last updated October 19, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$1,119
(oojo)

One-way from

$711
(KAYAK)
Provider with most accurate pricing for Washington, D.C. (WAS)-Ko Samui flight deals.
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Provider most trusted by Cheapflights users for Washington, D.C. (WAS)-Ko Samui flights.
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From District of Columbia to Ko Samui
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One-way flight from District of Columbia to Ko Samui
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Find flight deals from District of Columbia to Ko Samui

Cheapest flights from District of Columbia to Ko Samui
Explore the most affordable flight options available from District of Columbia to Ko Samui. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 19, 2025.

This oojo deal was found by Cheapflights users on 10/19. 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 stops36h 10mMultiple Airlines
Sun 1/255:40 pmUSM - IAD
2 stops33h 50mMultiple Airlines
Deal found 10/19$1,119
This oojo deal was found by Cheapflights users on 10/17. 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.
Mon 12/11:30 pmIAD - USM
2 stops40h 45mMultiple Airlines
Mon 12/88:30 pmUSM - IAD
2 stops27h 15mMultiple Airlines
Deal found 10/17$1,155
This oojo deal was found by Cheapflights users on 10/19. 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 12/39:10 pmIAD - USM
2 stops24h 10mEtihad Airways
Wed 12/108:50 amUSM - IAD
2 stops66h 40mEtihad Airways
Deal found 10/19$1,207
This oojo deal was found by Cheapflights users on 10/19. 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 stops35h 40mEtihad Airways
Mon 1/268:50 amUSM - IAD
2 stops66h 40mEtihad Airways
Deal found 10/19$1,223
This SmartFares deal was found by Cheapflights users on 10/18. 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 SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/3111:40 amIAD - USM
2 stops43h 35mMultiple Airlines
Fri 11/77:35 pmUSM - IAD
2 stops32h 20mMultiple Airlines
Deal found 10/18$1,315
This Mytrip deal was found by Cheapflights users on 10/19. 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 12/36:10 amDCA - USM
3 stops37h 35mMultiple Airlines
Wed 12/105:05 pmUSM - DCA
3 stops41h 30mMultiple Airlines
Deal found 10/19$1,471
This KAYAK deal was found by Cheapflights users on 10/17. 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 11/299:15 pmIAD - USM
2 stops33h 00mTurkish Airlines
Fri 1/301:25 pmUSM - IAD
2 stops34h 20mTurkish Airlines
Deal found 10/17$1,476
This oojo deal was found by Cheapflights users on 10/19. 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 12/312:59 pmDCA - USM
2 stops42h 36mCathay Pacific
Wed 12/1011:40 amUSM - DCA
2 stops47h 19mCathay Pacific
Deal found 10/19$1,651
This Cathay Pacific deal was found by Cheapflights users on 10/18. 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 Cathay Pacific is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/24:59 pmDCA - USM
2 stops38h 36mMultiple Airlines
Tue 12/911:40 amUSM - DCA
2 stops44h 20mMultiple Airlines
Deal found 10/18$1,654
This Cathay Pacific deal was found by Cheapflights users on 10/18. 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 Cathay Pacific is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/3012:31 pmDCA - USM
2 stops44h 04mCathay Pacific
Mon 11/311:40 amUSM - DCA
2 stops43h 04mCathay Pacific
Deal found 10/18$1,767
This Ovago deal was found by Cheapflights users on 10/18. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/3112:31 pmDCA - USM
2 stops44h 04mCathay Pacific
Fri 11/711:40 amUSM - DCA
2 stops41h 16mCathay Pacific
Deal found 10/18$2,184
This oojo deal was found by Cheapflights users on 10/19. 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.
Mon 11/246:50 amDCA - USM
2 stops48h 45mCathay Pacific
Sun 11/3011:40 amUSM - DCA
2 stops40h 04mCathay Pacific
Deal found 10/19$8,667

Cheapflights Fare Finder

 
Customize your flight search to find flights from District of Columbia 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 October 19, 2025.
Use the filters below to find and compare flights from District of Columbia to Ko Samui that are best for you.

Fly from

District of Columbia

Fly to

Ko Samui

Route

Depart

Return

Price

Washington, D.C.Ko Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

Sat 11/29

9:10 pm-9:20 pm

2 stops36h 10m

Ko Samui

Sun 1/25

5:40 pm-3:30 pm

2 stops33h 50m

$1,119

Washington, D.C.Ko Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

Mon 12/1

1:30 pm-6:15 pm

2 stops40h 45m

Ko Samui

Mon 12/8

8:30 pm-11:45 am

2 stops27h 15m

$1,155

Washington, D.C.Ko Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

Wed 12/3

9:10 pm-9:20 am

2 stops24h 10m

Ko Samui

Wed 12/10

8:50 am-3:30 pm

2 stops66h 40m

$1,207

Washington, D.C.Ko Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

Sat 11/29

9:10 pm-8:50 pm

2 stops35h 40m

Ko Samui

Mon 1/26

8:50 am-3:30 pm

2 stops66h 40m

$1,223

Washington, D.C.Ko Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

Fri 10/31

11:40 am-6:15 pm

2 stops43h 35m

Ko Samui

Fri 11/7

7:35 pm-3:55 pm

2 stops32h 20m

$1,315

Washington, D.C.Ko Samui

DCA - USM

DCAUSM

Washington, D.C. Reagan-National

Wed 12/3

6:10 am-7:45 am

3 stops37h 35m

Ko Samui

Wed 12/10

5:05 pm-10:35 pm

3 stops41h 30m

$1,471

Washington, D.C.Ko Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

Sat 11/29

9:15 pm-6:15 pm

2 stops33h 00m

Ko Samui

Fri 1/30

1:25 pm-11:45 am

2 stops34h 20m

$1,476

Washington, D.C.Ko Samui

DCA - USM

DCAUSM

Washington, D.C. Reagan-National

Wed 12/3

12:59 pm-7:35 pm

2 stops42h 36m

Ko Samui

Wed 12/10

11:40 am-10:59 pm

2 stops47h 19m

$1,651

Washington, D.C.Ko Samui

DCA - USM

DCAUSM

Washington, D.C. Reagan-National

Tue 12/2

4:59 pm-7:35 pm

2 stops38h 36m

Ko Samui

Tue 12/9

11:40 am-8:00 pm

2 stops44h 20m

$1,654

Washington, D.C.Ko Samui

DCA - USM

DCAUSM

Washington, D.C. Reagan-National

Thu 10/30

7:02 pm-7:35 pm

2 stops37h 33m

Ko Samui

Mon 11/3

11:40 am-6:44 pm

2 stops43h 04m

$1,767

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/17

Showing 1-10 of 13 results
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Best time to book a flight from District of Columbia to Ko Samui

Have a flexible travel schedule? Discover the best time to fly to Ko Samui from District of Columbia 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 District of Columbia to Ko Samui

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

Find hourly flight availability from District of Columbia 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 October 19, 2025.

One of the essential ways to save on airfare from District of Columbia 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 37% on airfare.

What is the cheapest day to fly from District of Columbia to Ko Samui?

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

Travelers seeking maximum savings on their District of Columbia to Ko Samui flight should consider departing on Monday at noon when fares are most often at their lowest. Sunday at noon 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 District of Columbia 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 District of Columbia?

    For a flight from District of Columbia to Ko Samui, you will be flying into Ko Samui. Ko Samui (USM) is just 2.1 mi from the center of the city.

  • How long is the flight from District of Columbia to Ko Samui?

    There are many flights that can get you from District of Columbia to Ko Samui in 24h 10m. Fly via Etihad Airways or Cathay Pacific to get the fastest option. The distance between District of Columbia and Ko Samui is about 9076 mi. This flight may include one or multiple stops.

  • Can I find deals for flights from District of Columbia to Ko Samui that include hotel bookings?

    Yes. In addition to deals on District of Columbia to Ko Samui flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from District of Columbia to Ko Samui?

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

  • Can I find deals for business class flights from District of Columbia to Ko Samui?

    Yes. Cheapflights offers flight deals from District of Columbia 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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