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Cheap flights from Washington, D.C. to Ko Samui from $542

1 adult
1 adult, Economy, 0 bags

Find the cheapest flights from Washington, D.C. to Ko Samui

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
2:25 pm - 8:25 amIAD  Washington, D.C. Dulles Intl-USM Ko Samui
30h 00m2 stops Abu Dhabi Zayed Intl Phuket City
Multiple Airlines Logo
2:30 pm - 9:00 amUSM  Ko Samui-IAD Washington, D.C. Dulles Intl
30h 30m2 stops Bangkok Suvarnabhumi Abu Dhabi Zayed Intl
$1,147Multiple Airlines
Sat, Dec 5 - Fri, Dec 11
Multiple Airlines Logo
2:25 pm - 8:25 amIAD  Washington, D.C. Dulles Intl-USM Ko Samui
30h 00m2 stops Abu Dhabi Zayed Intl Phuket City
Multiple Airlines Logo
3:35 pm - 9:00 amUSM  Ko Samui-IAD Washington, D.C. Dulles Intl
29h 25m2 stops Bangkok Suvarnabhumi Abu Dhabi Zayed Intl
$1,306Multiple Airlines
Sun, Jan 3 - Sat, Jan 30
Cathay Pacific Logo
5:55 pm - 7:40 pmIAD  Washington, D.C. Dulles Intl-USM Ko Samui
38h 45m2 stops Dallas/Fort Worth Hong Kong Intl
Cathay Pacific Logo
11:55 am - 11:28 pmUSM  Ko Samui-IAD Washington, D.C. Dulles Intl
46h 33m2 stops Hong Kong Intl Dallas/Fort Worth
$1,307Cathay Pacific
Sun, Apr 11 - Thu, Apr 15
Multiple Airlines Logo
2:25 pm - 9:20 amIAD  Washington, D.C. Dulles Intl-USM Ko Samui
30h 55m2 stops Abu Dhabi Zayed Intl Bangkok Suvarnabhumi
Multiple Airlines Logo
8:30 pm - 9:00 amUSM  Ko Samui-IAD Washington, D.C. Dulles Intl
48h 30m2 stops Bangkok Suvarnabhumi Abu Dhabi Zayed Intl
$1,774Multiple Airlines
Sun, Dec 27 - Wed, Jan 13
Multiple Airlines Logo
2:25 pm - 5:30 pmIAD  Washington, D.C. Dulles Intl-USM Ko Samui
39h 05m2 stops Abu Dhabi Zayed Intl Phuket City
Multiple Airlines Logo
1:45 pm - 11:45 amUSM  Ko Samui-IAD Washington, D.C. Dulles Intl
34h 00m3 stops Bangkok Suvarnabhumi Kuala Lumpur Intl Istanbul
$1,831Multiple Airlines
Sun, Jan 3 - Sat, Jan 30
Multiple Airlines Logo
2:25 pm - 8:10 amIAD  Washington, D.C. Dulles Intl-USM Ko Samui
29h 45m2 stops Abu Dhabi Zayed Intl Bangkok Suvarnabhumi
Multiple Airlines Logo
3:35 pm - 9:00 amUSM  Ko Samui-IAD Washington, D.C. Dulles Intl
29h 25m2 stops Bangkok Suvarnabhumi Abu Dhabi Zayed Intl
$1,962Multiple Airlines
Mon, Dec 21 - Mon, Dec 28
Multiple Airlines Logo
8:05 pm - 9:20 amIAD  Washington, D.C. Dulles Intl-USM Ko Samui
25h 15m2 stops Doha Hamad Intl Bangkok Suvarnabhumi
Multiple Airlines Logo
9:10 pm - 3:55 pmUSM  Ko Samui-IAD Washington, D.C. Dulles Intl
30h 45m2 stops Bangkok Suvarnabhumi Doha Hamad Intl
$1,992Multiple Airlines
Mon, Dec 28 - Thu, Jan 14
Multiple Airlines Logo
1:30 pm - 8:00 amIAD  Washington, D.C. Dulles Intl-USM Ko Samui
30h 30m3 stops Istanbul Athens Eleftherios V. Singapore Changi
Multiple Airlines Logo
2:30 pm - 11:45 amUSM  Ko Samui-IAD Washington, D.C. Dulles Intl
33h 15m3 stops Bangkok Suvarnabhumi Kuala Lumpur Intl Istanbul
$1,997Multiple Airlines
Sun, Jan 3 - Sat, Jan 30
Qatar Airways Logo
8:05 pm - 9:20 amIAD  Washington, D.C. Dulles Intl-USM Ko Samui
25h 15m2 stops Doha Hamad Intl Bangkok Suvarnabhumi
Qatar Airways Logo
7:00 pm - 3:55 pmUSM  Ko Samui-IAD Washington, D.C. Dulles Intl
32h 55m2 stops Phuket City Doha Hamad Intl
$2,003Qatar Airways
Mon, Dec 28 - Wed, Jan 13
EVA Air Logo
11:55 pm - 7:55 amIAD  Washington, D.C. Dulles Intl-USM Ko Samui
44h 00m2 stops Taipei City Taiwan Taoyuan Intl Bangkok Suvarnabhumi
EVA Air Logo
7:00 pm - 8:55 pmUSM  Ko Samui-IAD Washington, D.C. Dulles Intl
37h 55m2 stops Bangkok Suvarnabhumi Taipei City Taiwan Taoyuan Intl
$2,059EVA Air
Sat, Dec 26 - Thu, Jan 14

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Lufthansa flights from Washington, D.C. to Ko Samui

Our best Lufthansa deals on Washington, D.C. to Ko Samui flight tickets
Lufthansa
Dec 27
IAD10:55 pmWashington, D.C. Dulles Intl
32h 50m
2 stops
USM7:45 pmKo Samui
Jan 14
USM1:25 pmKo Samui
38h 30m
2 stops
IAD3:55 pmWashington, D.C. Dulles Intl
$2,216
Lufthansa
Dec 27
IAD10:55 pmWashington, D.C. Dulles Intl
32h 50m
2 stops
USM7:45 pmKo Samui
Jan 12
USM4:25 pmKo Samui
35h 30m
2 stops
IAD3:55 pmWashington, D.C. Dulles Intl
$2,301
Lufthansa
Dec 27
IAD10:55 pmWashington, D.C. Dulles Intl
32h 50m
2 stops
USM7:45 pmKo Samui
Jan 15
USM1:25 pmKo Samui
38h 30m
2 stops
IAD3:55 pmWashington, D.C. Dulles Intl
$2,415

Emirates flights from Washington, D.C. to Ko Samui

Our best Emirates deals on Washington, D.C. to Ko Samui flight tickets
Emirates
Dec 21
IAD10:35 amWashington, D.C. Dulles Intl
36h 00m
2 stops
USM10:35 amKo Samui
Dec 28
USM4:25 pmKo Samui
52h 10m
2 stops
IAD8:35 amWashington, D.C. Dulles Intl
$4,173
Emirates
Dec 17
IAD10:35 amWashington, D.C. Dulles Intl
46h 30m
2 stops
USM9:05 pmKo Samui
Dec 24
USM9:10 pmKo Samui
47h 25m
2 stops
IAD8:35 amWashington, D.C. Dulles Intl
$4,933

momondo Fare Finder

 
Use the filters below to find and compare flights from Washington, D.C. to Ko Samui that are best for you.

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Route

Depart

Return

Price

Cheapest round-trip

Washington, D.C.Ko Samui

IAD Washington, D.C. Dulles Intl - USM Ko Samui

IADUSM

Washington, D.C. Dulles Intl

Sat 12/5

2:25 pm-8:25 am

2 stops30h 00m

Ko Samui

Fri 12/11

2:30 pm-9:00 am

2 stops30h 30m

$1,147

Washington, D.C.Ko Samui

IAD Washington, D.C. Dulles Intl - USM Ko Samui

IADUSM

Washington, D.C. Dulles Intl

Sun 1/3

2:25 pm-8:25 am

2 stops30h 00m

Ko Samui

Sat 1/30

3:35 pm-9:00 am

2 stops29h 25m

$1,306

Washington, D.C.Ko Samui

IAD Washington, D.C. Dulles Intl - USM Ko Samui

IADUSM

Washington, D.C. Dulles Intl

Sun 4/11

5:55 pm-7:40 pm

2 stops38h 45m

Ko Samui

Thu 4/15

11:55 am-11:28 pm

2 stops46h 33m

$1,307

Washington, D.C.Ko Samui

IAD Washington, D.C. Dulles Intl - USM Ko Samui

IADUSM

Washington, D.C. Dulles Intl

Sun 12/27

2:25 pm-9:20 am

2 stops30h 55m

Ko Samui

Wed 1/13

8:30 pm-9:00 am

2 stops48h 30m

$1,774

Washington, D.C.Ko Samui

IAD Washington, D.C. Dulles Intl - USM Ko Samui

IADUSM

Washington, D.C. Dulles Intl

Sun 1/3

2:25 pm-5:30 pm

2 stops39h 05m

Ko Samui

Sat 1/30

1:45 pm-11:45 am

3 stops34h 00m

$1,831

Washington, D.C.Ko Samui

IAD Washington, D.C. Dulles Intl - USM Ko Samui

IADUSM

Washington, D.C. Dulles Intl

Mon 12/21

2:25 pm-8:10 am

2 stops29h 45m

Ko Samui

Mon 12/28

3:35 pm-9:00 am

2 stops29h 25m

$1,962
Quickest round-trip

Washington, D.C.Ko Samui

IAD Washington, D.C. Dulles Intl - USM Ko Samui

IADUSM

Washington, D.C. Dulles Intl

Mon 12/28

8:05 pm-9:20 am

2 stops25h 15m

Ko Samui

Thu 1/14

9:10 pm-3:55 pm

2 stops30h 45m

$1,992

Washington, D.C.Ko Samui

IAD Washington, D.C. Dulles Intl - USM Ko Samui

IADUSM

Washington, D.C. Dulles Intl

Sun 1/3

1:30 pm-8:00 am

3 stops30h 30m

Ko Samui

Sat 1/30

2:30 pm-11:45 am

3 stops33h 15m

$1,997

Washington, D.C.Ko Samui

IAD Washington, D.C. Dulles Intl - USM Ko Samui

IADUSM

Washington, D.C. Dulles Intl

Mon 12/28

8:05 pm-9:20 am

2 stops25h 15m

Ko Samui

Wed 1/13

7:00 pm-3:55 pm

2 stops32h 55m

$2,003

Washington, D.C.Ko Samui

IAD Washington, D.C. Dulles Intl - USM Ko Samui

IADUSM

Washington, D.C. Dulles Intl

Sat 12/26

11:55 pm-7:55 am

2 stops44h 00m

Ko Samui

Thu 1/14

7:00 pm-8:55 pm

2 stops37h 55m

$2,059

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Ko Samui from

How to get the cheapest flight ticket from Washington, D.C. to Ko Samui

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest airline that flies from Washington, D.C. to Ko Samui?

Cathay Pacific is the most popular carrier operating from Washington, D.C. to Ko Samui

When to book flights from Washington, D.C. to Ko Samui

Are you open to changing your travel dates? Check out the ideal times to fly from Washington, D.C. to Ko Samui according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Washington, D.C. to Ko Samui (WAS to USM) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Washington, D.C. to Ko Samui

Best Price Found

$542

Fastest flight time

30h 00m

Direct flights

None
The best one-way flight to Ko Samui from Washington, D.C. in the past 72 hours is $542. The best round-trip flight deal from Washington, D.C. to Ko Samui found on momondo in the last 72 hours is $1,147.
The fastest flight from Washington, D.C. to Ko Samui takes 30h 00m
There are no direct flights from Washington, D.C. to Ko Samui. There are no popular flight routes from Washington, D.C. to Ko Samui.
Search flight deals

Frequently asked questions about flying from Washington, D.C. to Ko Samui

  • How far is Washington, D.C. to Ko Samui by plane?

    Washington, D.C. and Ko Samui are 9079.2 mi apart from one another. A reasonable flight in good conditions will take 30h 00m.

  • When did momondo last update prices for flights from Washington, D.C. to Ko Samui Airport?

    Prices for flights from Washington, D.C. to Ko Samui Airport are updated daily.

  • How old do you have to be to fly from Washington, D.C. to Ko Samui Airport?

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Washington, D.C. to Ko Samui Airport.

  • What documentation or ID do you need to fly to Ko Samui Airport?

    The required travel and health documents for your Ko Samui Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Ko Samui Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

  • What is the most popular airline from Washington, D.C. to Ko Samui?

Traveling to a place near Ko Samui?

Book flights to Ko Samui if you plan to visit one of these locations
Ko Pha Ngan
Ko Tao
Khanom

Why use momondo?

Why should I use momondo to find a flight deal from Washington, D.C. to Ko Samui?

It is quick and easy to find Washington, D.C. to Ko Samui flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Ko Samui that suits you.

Can I find flights from Washington, D.C. to Ko Samui with flexible booking policies on momondo?

All flight searches from Washington, D.C. to Ko Samui on momondo can be filtered to show those which offer flexible booking policies.

How can momondo help me find flights from Washington, D.C. to Ko Samui?

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I’m not ready to book a flight from Washington, D.C. to Ko Samui right now. Can momondo alert me if prices change?

Yes. momondo can track prices for Washington, D.C. to Ko Samui flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

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