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Ko Samui

$551+ 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 3/9. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — USM
Feb 28 — Mar 71
Sat 2/28
Sat 3/7
1 adult, Economy
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Cheap 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 January 29, 2026.

This Trip.com deal was found by Cheapflights users on 1/27. 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.
Thu 4/233:10 pm
IAD
-
USM
2 stops29h 00m
Multiple Airlines
Thu 4/306:00 am
USM
-
IAD
2 stops38h 45m
Multiple Airlines
Deal found 1/27$997
This BusinessClass deal was found by Cheapflights users on 1/27. 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 BusinessClass is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/163:35 pm
IAD
-
USM
2 stops29h 30m
Etihad Airways
Thu 3/266:15 pm
USM
-
IAD
2 stops26h 50m
Etihad Airways
Deal found 1/27$1,069
This oojo deal was found by Cheapflights users on 1/27. 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.
Fri 3/132:30 pm
IAD
-
USM
2 stops30h 15m
Multiple Airlines
Fri 3/207:35 pm
USM
-
IAD
2 stops28h 10m
Multiple Airlines
Deal found 1/27$1,142
This KAYAK deal was found by Cheapflights users on 1/27. 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.
Sun 5/171:20 pm
IAD
-
USM
2 stops41h 55m
Turkish Airlines
Tue 5/266:25 pm
USM
-
IAD
2 stops36h 25m
Turkish Airlines
Deal found 1/27$1,271
This KAYAK deal was found by Cheapflights users on 1/27. 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.
Sun 5/171:20 pm
IAD
-
USM
2 stops41h 55m
Turkish Airlines
Sun 5/317:50 am
USM
-
IAD
2 stops38h 45m
Turkish Airlines
Deal found 1/27$1,286
This KAYAK deal was found by Cheapflights users on 1/27. 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.
Tue 5/191:20 pm
IAD
-
USM
2 stops36h 50m
Turkish Airlines
Thu 5/286:25 pm
USM
-
IAD
2 stops28h 10m
Turkish Airlines
Deal found 1/27$1,296
This KAYAK deal was found by Cheapflights users on 1/27. 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.
Wed 5/209:45 pm
IAD
-
USM
2 stops31h 50m
Turkish Airlines
Tue 5/267:10 pm
USM
-
IAD
2 stops35h 40m
Turkish Airlines
Deal found 1/27$1,299
This Gurufare deal was found by Cheapflights users on 1/27. 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.
Tue 5/191:20 pm
IAD
-
USM
2 stops36h 50m
Turkish Airlines
Sat 5/303:50 pm
USM
-
IAD
2 stops30h 45m
Turkish Airlines
Deal found 1/27$1,300
This KAYAK deal was found by Cheapflights users on 1/27. 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.
Wed 5/209:45 pm
IAD
-
USM
2 stops31h 00m
Turkish Airlines
Sun 5/317:50 am
USM
-
IAD
2 stops38h 45m
Turkish Airlines
Deal found 1/27$1,314
This KAYAK deal was found by Cheapflights users on 1/27. 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.
Sun 5/171:20 pm
IAD
-
USM
2 stops36h 50m
Turkish Airlines
Thu 5/288:50 pm
USM
-
IAD
2 stops34h 00m
Turkish Airlines
Deal found 1/27$1,342
This SmartFares deal was found by Cheapflights users on 1/27. 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.
Thu 4/239:59 am
DCA
-
USM
2 stops40h 11m
Multiple Airlines
Thu 4/308:20 am
USM
-
DCA
2 stops46h 40m
Multiple Airlines
Deal found 1/27$1,713
This oojo deal was found by Cheapflights users on 1/27. 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 3/166:20 am
DCA
-
USM
2 stops26h 15m
Cathay Pacific
Thu 3/2611:40 am
USM
-
DCA
2 stops42h 15m
Cathay Pacific
Deal found 1/27$1,962

Find 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 January 29, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$997
(Trip.com)

One-way from

$551
(Booking.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.
Search Deals
From District of Columbia to Ko Samui
Search Deals
One-way flight from District of Columbia to Ko Samui
Search Deals

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 January 29, 2026.
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

Thu 4/23

3:10 pm-7:10 am

2 stops29h 00m

Ko Samui

Thu 4/30

6:00 am-9:45 am

2 stops38h 45m

$997

Washington, D.C.Ko Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

Mon 3/16

3:35 pm-8:05 am

2 stops29h 30m

Ko Samui

Thu 3/26

6:15 pm-10:05 am

2 stops26h 50m

$1,069

Washington, D.C.Ko Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

Fri 3/13

2:30 pm-7:45 am

2 stops30h 15m

Ko Samui

Fri 3/20

7:35 pm-12:45 pm

2 stops28h 10m

$1,142

Washington, D.C.Ko Samui

DCA - USM

DCAUSM

Washington, D.C. Reagan-National

Thu 4/23

9:59 am-1:10 pm

2 stops40h 11m

Ko Samui

Thu 4/30

8:20 am-8:00 pm

2 stops46h 40m

$1,713

Washington, D.C.Ko Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

Thu 4/23

8:20 pm-8:50 pm

3 stops37h 30m

Ko Samui

Thu 4/30

8:45 am-8:40 am

3 stops34h 55m

$1,764

Washington, D.C.Ko Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

Mon 3/16

11:00 am-3:40 pm

2 stops41h 40m

Ko Samui

Thu 3/26

7:35 pm-9:00 am

3 stops48h 25m

$1,822

Washington, D.C.Ko Samui

DCA - USM

DCAUSM

Washington, D.C. Reagan-National

Mon 3/16

6:20 am-7:35 pm

2 stops26h 15m

Ko Samui

Thu 3/26

11:40 am-6:55 pm

2 stops42h 15m

$1,962

Washington, D.C.Ko Samui

DCA - USM

DCAUSM

Washington, D.C. Reagan-National

Fri 3/13

4:59 pm-7:35 pm

2 stops39h 36m

Ko Samui

Fri 3/20

11:40 am-6:55 pm

2 stops42h 15m

$2,219

Washington, D.C.Ko Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

Mon 3/9

3:35 pm-7:45 am

2 stops29h 10m

$551

Washington, D.C.Ko Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

Fri 3/13

3:35 pm-7:45 am

2 stops29h 10m

$591

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/27

Showing 1-10 of 15 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 January 29, 2026.

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 26h 15m. Fly via Etihad Airways or Cathay Pacific to get the fastest option. The distance between District of Columbia and Ko Samui is about 9081 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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