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Ko Samui

$1,209+ Cheap flights from Reagan-National (DCA) 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.
DCA — USM
Jun 17 — Jun 241
Tue 6/17
Tue 6/24
1 adult, Economy
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Cheap flight deals from Reagan-National to Ko Samui

Discover tips and strategies to find the most affordable flight options for your journey from Reagan-National (DCA) 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

$1,673
(KAYAK)

One-way from

$1,209
(Gurufare)
From Washington, D.C. Reagan-National to Ko Samui
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One-way flight from Washington, D.C. Reagan-National to Ko Samui
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Find flight deals from Reagan-National to Ko Samui

Cheapest flights from Reagan-National to Ko Samui
Explore the most affordable flight options available from Reagan-National to Ko Samui. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 12, 2025.

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 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

Cheapflights Fare Finder

Customize your flight search to find flights from Reagan-National 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. Reagan-National Airport to Ko Samui that are best for you.

Fly from

Reagan-National

Fly to

Ko Samui

Route

Depart

Return

Price

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

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

Washington, D.C.Ko Samui

DCA - USM

DCAUSM

Washington, D.C. Reagan-National

Thu 8/14

6:58 pm-6:35 pm

2 stops36h 37m

$1,209

Washington, D.C.Ko Samui

DCA - USM

DCAUSM

Washington, D.C. Reagan-National

Thu 8/14

7:20 pm-10:45 am

3 stops28h 25m

$1,221

Washington, D.C.Ko Samui

DCA - USM

DCAUSM

Washington, D.C. Reagan-National

Thu 8/14

9:59 am-6:15 pm

2 stops45h 16m

$1,247

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/11

Best time to book a flight from Reagan-National to Ko Samui

Have a flexible travel schedule? Discover the best time to fly to Ko Samui from Reagan-National 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. Reagan-National Airport to Ko Samui

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

Find hourly flight availability from Reagan-National 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. Reagan-National Airport 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 48% on airfare.

What is the cheapest day to fly from Washington, D.C. Reagan-National Airport to Ko Samui?

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

Travelers seeking maximum savings on their Washington, D.C. Reagan-National Airport to Ko Samui flight should consider departing on Wednesday evenings 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.

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.
Singapore Airlines
8.1
Very good
1,302 reviews

Food

7.7

Boarding

8.2

Entertainment

8.0

Overall

8.1

Comfort

7.9

Crew

8.6

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

Food

7.7

Boarding

8.2

Entertainment

8.0

Overall

8.1

Comfort

7.9

Crew

8.6

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

Food

7.7

Boarding

8.2

Entertainment

8.0

Overall

8.1

Comfort

7.9

Crew

8.6

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

Food

7.7

Boarding

8.2

Entertainment

8.0

Overall

8.1

Comfort

7.9

Crew

8.6

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 Reagan-National 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. Reagan-National?

    Most people fly into Ko Samui (USM) if they book a flight to Ko Samui from Washington, D.C. Reagan-National. On average, Ko Samui has 0 inbound flights from Washington, D.C. Reagan-National per day from 0 airlines. Ko Samui is conveniently located just 2.1 mi from Ko Samui’s city center.

  • Can I find deals for flights from Reagan-National to Ko Samui that include hotel bookings?

    Yes. In addition to deals on Reagan-National to Ko Samui flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Reagan-National to Ko Samui?

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

  • Can I find deals for business class flights from Reagan-National to Ko Samui?

    Yes. Cheapflights offers flight deals from Reagan-National 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 Washington, D.C. Reagan-National Airport?

Book flights to Washington, D.C. Reagan-National Airport if you plan to visit one of these locations
Ko Tao
Ko Pha Ngan

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