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Ko Samui

$634+ 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 10/1. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — USM
Jul 8 — Jul 151
Tue 7/8
Tue 7/15
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 July 3, 2025.

Round-trip from

$1,266
(CheapTickets)

One-way from

$634
(Kiwi.com)
From District of Columbia to Ko Samui
Search Deals
One-way flight from District of Columbia to Ko Samui
Search Deals

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 July 3, 2025.

This Trip.com deal was found by Cheapflights users on 7/3. 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 11/2911:05 amIAD - USM
2 stops45h 20mMultiple Airlines
Mon 1/268:30 amUSM - IAD
2 stops60h 40mMultiple Airlines
Deal found 7/3$1,236
This FlightHub deal was found by Cheapflights users on 7/1. 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 11/299:10 pmIAD - USM
2 stops27h 55mTurkish Airlines
Mon 1/262:05 pmUSM - IAD
2 stops33h 40mTurkish Airlines
Deal found 7/1$1,244
This CheapTickets deal was found by Cheapflights users on 7/1. 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 CheapTickets is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/1512:15 pmIAD - USM
2 stops32h 20mANA
Fri 8/221:30 pmUSM - IAD
2 stops52h 30mANA
Deal found 7/1$1,266
This FlightHub deal was found by Cheapflights users on 7/3. 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 11/298:05 pmIAD - USM
2 stops26h 35mQatar Airways
Mon 1/263:05 pmUSM - IAD
2 stops36h 50mQatar Airways
Deal found 7/3$1,371
This Emirates deal was found by Cheapflights users on 7/2. 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 Emirates is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/2910:30 amIAD - USM
2 stops38h 35mEmirates
Fri 1/307:55 amUSM - IAD
2 stops36h 15mEmirates
Deal found 7/2$1,480
This Cathay Pacific deal was found by Cheapflights users on 7/2. 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 9/187:33 pmDCA - USM
2 stops36h 02mCathay Pacific
Mon 9/2210:55 amUSM - DCA
2 stops32h 04mCathay Pacific
Deal found 7/2$1,798
This Singapore Airlines deal was found by Cheapflights users on 7/2. 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.
Thu 9/188:59 amDCA - USM
2 stops46h 16mSingapore Airlines
Mon 9/221:30 pmUSM - DCA
3 stops66h 29mSingapore Airlines
Deal found 7/2$1,969
This Booking.com deal was found by Cheapflights users on 6/30. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/2910:15 pmIAD - USM
3 stops29h 20mSWISS
Mon 1/264:25 pmUSM - IAD
2 stops36h 05mSWISS
Deal found 6/30$2,186
This Ovago deal was found by Cheapflights users on 7/1. 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.
Tue 7/228:19 pmIAD - USM
2 stops35h 16mCathay Pacific
Thu 7/3110:55 amUSM - IAD
2 stops54h 55mCathay Pacific
Deal found 7/1$3,494
This business-class.com deal was found by Cheapflights users on 7/1. 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 business-class.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/226:00 amDCA - USM
2 stops25h 35mMultiple Airlines
Thu 7/318:00 amUSM - DCA
3 stops34h 49mMultiple Airlines
Deal found 7/1$4,562

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 July 3, 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

Fri 8/15

12:15 pm-7:35 am

2 stops32h 20m

Ko Samui

Fri 8/22

1:30 pm-7:00 am

2 stops52h 30m

$1,266

Washington, D.C.Ko Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

Wed 10/1

9:00 pm-9:20 am

2 stops25h 20m

Ko Samui

Thu 10/30

3:50 pm-9:20 am

2 stops28h 30m

$1,319

Washington, D.C.Ko Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

Thu 9/25

9:00 pm-1:55 pm

2 stops29h 55m

Ko Samui

Mon 9/29

5:55 pm-3:40 pm

2 stops32h 45m

$1,455

Washington, D.C.Ko Samui

DCA - USM

DCAUSM

Washington, D.C. Reagan-National

Thu 9/18

7:33 pm-6:35 pm

2 stops36h 02m

Ko Samui

Mon 9/22

10:55 am-7:59 am

2 stops32h 04m

$1,798

Washington, D.C.Ko Samui

DCA - USM

DCAUSM

Washington, D.C. Reagan-National

Thu 9/18

8:59 am-6:15 pm

2 stops46h 16m

Ko Samui

Mon 9/22

1:30 pm-8:59 pm

3 stops66h 29m

$1,969

Washington, D.C.Ko Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

Tue 7/22

8:19 pm-6:35 pm

2 stops35h 16m

Ko Samui

Thu 7/31

10:55 am-6:50 am

2 stops54h 55m

$3,494

Washington, D.C.Ko Samui

DCA - USM

DCAUSM

Washington, D.C. Reagan-National

Tue 7/22

6:00 am-6:35 pm

2 stops25h 35m

Ko Samui

Thu 7/31

8:00 am-7:49 am

3 stops34h 49m

$4,562

Washington, D.C.Ko Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

Wed 10/1

11:00 am-7:20 am

3 stops57h 20m

$634

Washington, D.C.Ko Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

Thu 8/14

9:40 pm-1:10 pm

2 stops28h 30m

$720

Washington, D.C.Ko Samui

DCA - USM

DCAUSM

Washington, D.C. Reagan-National

Wed 10/1

8:59 am-6:15 pm

2 stops46h 16m

$993

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/2

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 July 3, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from District of Columbia to Ko Samui as you normally would.

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 July 3, 2025.
Get a feel of what it's like to fly with ANA, Singapore Airlines, and Cathay Pacific from District of Columbia to Ko Samui by reading reviews from past customers. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
ANA
8.4
Very good
893 reviews

Comfort

8.2

Food

7.7

Overall

8.4

Crew

8.7

Entertainment

7.9

Boarding

8.5

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

SEA - HND

The flight with ANA was fantastic. Huge plane but was boarded swiftly and efficiently with a lot of crew members engaged to expedite the process. The onboard crew was polite and considerate and constantly doing things to serve passengers. The plane was new and in great working order-- definitely more spacious than the Alaska plane we took from SLC. Food was solid, not great. Lots of movie options.
ANA
8.4
Very good
893 reviews
ANA
8.4
Very good
893 reviews

Comfort

8.2

Food

7.7

Overall

8.4

Crew

8.7

Entertainment

7.9

Boarding

8.5

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

SEA - HND

The flight with ANA was fantastic. Huge plane but was boarded swiftly and efficiently with a lot of crew members engaged to expedite the process. The onboard crew was polite and considerate and constantly doing things to serve passengers. The plane was new and in great working order-- definitely more spacious than the Alaska plane we took from SLC. Food was solid, not great. Lots of movie options.
Singapore Airlines
8.1
Very good
1,320 reviews
ANA
8.4
Very good
893 reviews

Comfort

8.2

Food

7.7

Overall

8.4

Crew

8.7

Entertainment

7.9

Boarding

8.5

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

SEA - HND

The flight with ANA was fantastic. Huge plane but was boarded swiftly and efficiently with a lot of crew members engaged to expedite the process. The onboard crew was polite and considerate and constantly doing things to serve passengers. The plane was new and in great working order-- definitely more spacious than the Alaska plane we took from SLC. Food was solid, not great. Lots of movie options.
Cathay Pacific
7.6
Good
921 reviews
ANA
8.4
Very good
893 reviews

Comfort

8.2

Food

7.7

Overall

8.4

Crew

8.7

Entertainment

7.9

Boarding

8.5

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

SEA - HND

The flight with ANA was fantastic. Huge plane but was boarded swiftly and efficiently with a lot of crew members engaged to expedite the process. The onboard crew was polite and considerate and constantly doing things to serve passengers. The plane was new and in great working order-- definitely more spacious than the Alaska plane we took from SLC. Food was solid, not great. Lots of movie options.
Qatar Airways
7.4
Good
3,594 reviews
ANA
8.4
Very good
893 reviews

Comfort

8.2

Food

7.7

Overall

8.4

Crew

8.7

Entertainment

7.9

Boarding

8.5

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

SEA - HND

The flight with ANA was fantastic. Huge plane but was boarded swiftly and efficiently with a lot of crew members engaged to expedite the process. The onboard crew was polite and considerate and constantly doing things to serve passengers. The plane was new and in great working order-- definitely more spacious than the Alaska plane we took from SLC. Food was solid, not great. Lots of movie options.
Turkish Airlines
7.3
Good
3,895 reviews
ANA
8.4
Very good
893 reviews

Comfort

8.2

Food

7.7

Overall

8.4

Crew

8.7

Entertainment

7.9

Boarding

8.5

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

SEA - HND

The flight with ANA was fantastic. Huge plane but was boarded swiftly and efficiently with a lot of crew members engaged to expedite the process. The onboard crew was polite and considerate and constantly doing things to serve passengers. The plane was new and in great working order-- definitely more spacious than the Alaska plane we took from SLC. Food was solid, not great. Lots of movie options.

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.

  • 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 District of Columbia?

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

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Alternative routes for District of Columbia to Ko Samui

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