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Ko Samui

$709+ 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
Jun 17 — Jun 241
Tue 6/17
Tue 6/24
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 June 12, 2025.

Round-trip from

$1,165
(Turkish Airlines)

One-way from

$709
(FlightHub)
From Washington, D.C. (WAS) to Ko Samui
Search Deals
One-way flight from Washington, D.C. (WAS) to Ko Samui
Search Deals

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 June 12, 2025.

This Turkish Airlines deal was found by Cheapflights users on 6/11. 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 Turkish Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/59:40 pmIAD - USM
2 stops23h 35mTurkish Airlines
Fri 9/127:00 pmUSM - IAD
2 stops27h 45mTurkish Airlines
Deal found 6/11$1,165
This Trip.com deal was found by Cheapflights users on 6/11. 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 11/299:10 pmIAD - USM
2 stops35h 35mMultiple Airlines
Mon 1/267:00 amUSM - IAD
2 stops48h 15mMultiple Airlines
Deal found 6/11$1,249
This Emirates deal was found by Cheapflights users on 6/10. 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 stops40h 25mEmirates
Fri 1/307:55 amUSM - IAD
2 stops36h 15mEmirates
Deal found 6/10$1,480
This KAYAK deal was found by Cheapflights users on 6/10. 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 12/289:30 pmIAD - USM
2 stops26h 25mEtihad Airways
Sat 1/105:05 pmUSM - IAD
2 stops35h 00mEtihad Airways
Deal found 6/10$1,539
This KAYAK deal was found by Cheapflights users on 6/11. 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.
Mon 9/88:59 amDCA - USM
2 stops49h 11mSingapore Airlines
Mon 9/151:30 pmUSM - DCA
2 stops42h 29mSingapore Airlines
Deal found 6/11$1,673
This Gurufare deal was found by Cheapflights users on 6/11. 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 9/86:30 amDCA - USM
2 stops25h 05mMultiple Airlines
Mon 9/157:15 pmUSM - DCA
3 stops50h 13mMultiple Airlines
Deal found 6/11$1,704
This Ovago deal was found by Cheapflights users on 6/11. 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 6/179:00 pmIAD - USM
2 stops26h 45mQatar Airways
Fri 7/49:00 pmUSM - IAD
2 stops46h 40mQatar Airways
Deal found 6/11$1,721
This Gurufare deal was found by Cheapflights users on 6/11. 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.
Fri 9/56:30 amDCA - USM
2 stops25h 05mCathay Pacific
Fri 9/1210:55 amUSM - DCA
2 stops32h 03mCathay Pacific
Deal found 6/11$1,809
This Gurufare deal was found by Cheapflights users on 6/11. 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 10/17:28 pmBWI - USM
2 stops35h 47mSingapore Airlines
Fri 10/311:25 pmUSM - BWI
2 stops39h 32mSingapore Airlines
Deal found 6/11$1,927
This Mytrip deal was found by Cheapflights users on 6/11. 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 7/266:22 pmBWI - USM
3 stops33h 23mMultiple Airlines
Sat 8/25:40 pmUSM - BWI
3 stops46h 53mMultiple Airlines
Deal found 6/11$1,969
This Booking.com deal was found by Cheapflights users on 6/10. 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
Sun 1/254:25 pmUSM - IAD
2 stops35h 05mSWISS
Deal found 6/10$2,510
This Gurufare deal was found by Cheapflights users on 6/11. 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.
Sat 7/267:19 pmBWI - USM
2 stops36h 16mCathay Pacific
Sat 8/210:55 amUSM - BWI
2 stops46h 22mCathay Pacific
Deal found 6/11$2,660

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 June 12, 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

Fri 9/5

9:40 pm-8:15 am

2 stops23h 35m

Ko Samui

Fri 9/12

7:00 pm-11:45 am

2 stops27h 45m

$1,165

Washington, D.C.Ko Samui

DCA - USM

DCAUSM

Washington, D.C. Reagan-National

Mon 9/8

8:59 am-9:10 pm

2 stops49h 11m

Ko Samui

Mon 9/15

1:30 pm-8:59 pm

2 stops42h 29m

$1,673

Washington, D.C.Ko Samui

DCA - USM

DCAUSM

Washington, D.C. Reagan-National

Mon 9/8

6:30 am-6:35 pm

2 stops25h 05m

Ko Samui

Mon 9/15

7:15 pm-10:28 am

3 stops50h 13m

$1,704

Washington, D.C.Ko Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

Fri 9/5

10:55 am-4:35 pm

2 stops42h 40m

Ko Samui

Fri 9/12

9:00 pm-8:05 pm

3 stops34h 05m

$1,720

Washington, D.C.Ko Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

Tue 6/17

9:00 pm-10:45 am

2 stops26h 45m

Ko Samui

Fri 7/4

9:00 pm-8:40 am

2 stops46h 40m

$1,721

Washington, D.C.Ko Samui

DCA - USM

DCAUSM

Washington, D.C. Reagan-National

Fri 9/5

6:30 am-6:35 pm

2 stops25h 05m

Ko Samui

Fri 9/12

10:55 am-7:58 am

2 stops32h 03m

$1,809

BaltimoreKo Samui

BWI - USM

BWIUSM

Baltimore/Washington

Sat 7/26

6:22 pm-2:45 pm

3 stops33h 23m

Ko Samui

Sat 8/2

5:40 pm-5:33 am

3 stops46h 53m

$1,969

BaltimoreKo Samui

BWI - USM

BWIUSM

Baltimore/Washington

Fri 9/5

6:55 pm-9:10 pm

2 stops39h 15m

Ko Samui

Fri 9/12

1:30 pm-5:07 pm

2 stops38h 37m

$1,986

BaltimoreKo Samui

BWI - USM

BWIUSM

Baltimore/Washington

Sat 7/26

7:19 pm-6:35 pm

2 stops36h 16m

Ko Samui

Sat 8/2

10:55 am-10:17 pm

2 stops46h 22m

$2,660

BaltimoreKo Samui

BWI - USM

BWIUSM

Baltimore/Washington

Tue 6/17

9:20 pm-6:15 pm

2 stops33h 55m

Ko Samui

Fri 7/4

4:25 pm-7:35 pm

2 stops38h 10m

$3,801

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/11

Showing 1-10 of 16 results
1
2

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 June 12, 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 June 12, 2025.
To help decide which airline to fly from Washington, D.C. to Ko Samui, see what other customers have to say about Singapore Airlines, Cathay Pacific and Qatar Airways. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Singapore Airlines
8.1
Very good
1,302 reviews

Crew

8.6

Overall

8.1

Food

7.7

Comfort

7.9

Entertainment

8.0

Boarding

8.2

Reviews

1 / 20
6.0
Good

Gina,Dec 2024

BLR - SIN

Overall the experience was good. First flight of 17 hours had no entertainment since Singapore airline has technical issues. Was informed that passengers would get a $350 voucher for future flight. Uncertain how that is being distributed but would like to understand if an email is required from my end or if it is an automatic email sent to me by Singapore Airlines. -Gina Robles
Singapore Airlines
8.1
Very good
1,302 reviews
Singapore Airlines
8.1
Very good
1,302 reviews

Crew

8.6

Overall

8.1

Food

7.7

Comfort

7.9

Entertainment

8.0

Boarding

8.2

Reviews

1 / 20
6.0
Good

Gina,Dec 2024

BLR - SIN

Overall the experience was good. First flight of 17 hours had no entertainment since Singapore airline has technical issues. Was informed that passengers would get a $350 voucher for future flight. Uncertain how that is being distributed but would like to understand if an email is required from my end or if it is an automatic email sent to me by Singapore Airlines. -Gina Robles
Cathay Pacific
7.6
Good
892 reviews
Singapore Airlines
8.1
Very good
1,302 reviews

Crew

8.6

Overall

8.1

Food

7.7

Comfort

7.9

Entertainment

8.0

Boarding

8.2

Reviews

1 / 20
6.0
Good

Gina,Dec 2024

BLR - SIN

Overall the experience was good. First flight of 17 hours had no entertainment since Singapore airline has technical issues. Was informed that passengers would get a $350 voucher for future flight. Uncertain how that is being distributed but would like to understand if an email is required from my end or if it is an automatic email sent to me by Singapore Airlines. -Gina Robles
Qatar Airways
7.4
Good
3,584 reviews
Singapore Airlines
8.1
Very good
1,302 reviews

Crew

8.6

Overall

8.1

Food

7.7

Comfort

7.9

Entertainment

8.0

Boarding

8.2

Reviews

1 / 20
6.0
Good

Gina,Dec 2024

BLR - SIN

Overall the experience was good. First flight of 17 hours had no entertainment since Singapore airline has technical issues. Was informed that passengers would get a $350 voucher for future flight. Uncertain how that is being distributed but would like to understand if an email is required from my end or if it is an automatic email sent to me by Singapore Airlines. -Gina Robles
Turkish Airlines
7.3
Good
3,848 reviews
Singapore Airlines
8.1
Very good
1,302 reviews

Crew

8.6

Overall

8.1

Food

7.7

Comfort

7.9

Entertainment

8.0

Boarding

8.2

Reviews

1 / 20
6.0
Good

Gina,Dec 2024

BLR - SIN

Overall the experience was good. First flight of 17 hours had no entertainment since Singapore airline has technical issues. Was informed that passengers would get a $350 voucher for future flight. Uncertain how that is being distributed but would like to understand if an email is required from my end or if it is an automatic email sent to me by Singapore Airlines. -Gina Robles
British Airways
6.6
Okay
7,008 reviews
Singapore Airlines
8.1
Very good
1,302 reviews

Crew

8.6

Overall

8.1

Food

7.7

Comfort

7.9

Entertainment

8.0

Boarding

8.2

Reviews

1 / 20
6.0
Good

Gina,Dec 2024

BLR - SIN

Overall the experience was good. First flight of 17 hours had no entertainment since Singapore airline has technical issues. Was informed that passengers would get a $350 voucher for future flight. Uncertain how that is being distributed but would like to understand if an email is required from my end or if it is an automatic email sent to me by Singapore Airlines. -Gina Robles

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 $1,165, 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 Qatar Airways - these airlines can fly you to your destination from $1,673 and $1,721, 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, 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

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