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Cheap flights from Washington, D.C. Dulles Intl Airport to Ko Samui from $592

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Washington, D.C. Dulles Intl Airport to Ko Samui departing on 10/6. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Find the cheapest flights from Washington, D.C. Dulles Intl Airport to Ko Samui

Cheap round-trip flights

Logo
9:00 pm - 10:10 amIAD-USM
26h 10m2 stops
Logo
4:30 pm - 4:55 pmUSM-IAD
35h 25m2 stops
$1,174
Find Deal
Wed, Oct 1 - Fri, Oct 31
Turkish Airlines Logo
1:30 pm - 8:05 amIAD-USM
30h 35m2 stops
Turkish Airlines Logo
1:25 pm - 11:45 amUSM-IAD
34h 20m2 stops
$1,176Turkish Airlines
Find Deal
Sat, Nov 29 - Sun, Jan 25
Logo
9:00 pm - 10:10 amIAD-USM
26h 10m2 stops
Logo
4:30 pm - 4:55 pmUSM-IAD
35h 25m2 stops
$1,241
Find Deal
Wed, Oct 1 - Fri, Oct 31
Turkish Airlines Logo
1:30 pm - 8:15 amIAD-USM
31h 45m2 stops
Turkish Airlines Logo
4:25 pm - 11:45 amUSM-IAD
54h 20m2 stops
$1,251Turkish Airlines
Find Deal
Thu, Sep 25 - Mon, Sep 29
Turkish Airlines Logo
1:30 pm - 6:15 pmIAD-USM
40h 45m2 stops
Turkish Airlines Logo
8:15 am - 7:15 pmUSM-IAD
47h 00m2 stops
$1,296Turkish Airlines
Find Deal
Mon, Jan 12 - Tue, Feb 3
Logo
9:20 pm - 2:45 pmIAD-USM
30h 25m3 stops
Logo
7:00 pm - 8:05 pmUSM-IAD
36h 05m3 stops
$1,443
Find Deal
Wed, Oct 1 - Fri, Oct 31
Turkish Airlines Logo
1:30 pm - 8:10 amIAD-USM
30h 40m2 stops
Turkish Airlines Logo
7:10 pm - 7:15 pmUSM-IAD
36h 05m2 stops
$1,505Turkish Airlines
Find Deal
Sat, Nov 29 - Fri, Jan 30
Qatar Airways Logo
8:05 pm - 3:40 pmIAD-USM
31h 35m2 stops
Qatar Airways Logo
5:25 pm - 3:55 pmUSM-IAD
34h 30m2 stops
$1,538Qatar Airways
Find Deal
Sat, Nov 29 - Fri, Jan 30
Logo
10:55 am - 2:45 pmIAD-USM
40h 50m2 stops
Logo
8:45 pm - 8:05 pmUSM-IAD
34h 20m3 stops
$1,578
Find Deal
Wed, Oct 1 - Fri, Oct 31
Qatar Airways Logo
9:05 pm - 10:40 amIAD-USM
26h 35m2 stops
Qatar Airways Logo
3:50 pm - 3:55 pmUSM-IAD
36h 05m2 stops
$1,697Qatar Airways
Find Deal
Thu, Oct 30 - Mon, Dec 29

Turkish Airlines flights from Washington, D.C. Dulles Intl Airport to Ko Samui

Our best Turkish Airlines deals on Washington, D.C. Dulles Intl Airport to Ko Samui flight tickets
Turkish Airlines
Nov 29
IAD1:30 pmWashington, D.C. Dulles Intl
30h 35m
2 stops
USM8:05 amKo Samui
Jan 25
USM1:25 pmKo Samui
34h 20m
2 stops
IAD11:45 amWashington, D.C. Dulles Intl
$1,176
Find similar
Turkish Airlines
Sep 25
IAD1:30 pmWashington, D.C. Dulles Intl
31h 45m
2 stops
USM8:15 amKo Samui
Sep 29
USM4:25 pmKo Samui
54h 20m
2 stops
IAD11:45 amWashington, D.C. Dulles Intl
$1,251
Find similar
Turkish Airlines
Jan 12
IAD1:30 pmWashington, D.C. Dulles Intl
40h 45m
2 stops
USM6:15 pmKo Samui
Feb 3
USM8:15 amKo Samui
47h 00m
2 stops
IAD7:15 pmWashington, D.C. Dulles Intl
$1,296
Find similar

Qatar Airways flights from Washington, D.C. Dulles Intl Airport to Ko Samui

Our best Qatar Airways deals on Washington, D.C. Dulles Intl Airport to Ko Samui flight tickets
Qatar Airways
Nov 29
IAD8:05 pmWashington, D.C. Dulles Intl
31h 35m
2 stops
USM3:40 pmKo Samui
Jan 30
USM5:25 pmKo Samui
34h 30m
2 stops
IAD3:55 pmWashington, D.C. Dulles Intl
$1,538
Find similar
Qatar Airways
Oct 30
IAD9:05 pmWashington, D.C. Dulles Intl
26h 35m
2 stops
USM10:40 amKo Samui
Dec 29
USM3:50 pmKo Samui
36h 05m
2 stops
IAD3:55 pmWashington, D.C. Dulles Intl
$1,697
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Washington, D.C. Dulles Intl Airport 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, momondo users made 832,500 searches. Data last updated September 11, 2025.
Use the filters below to find and compare flights from Washington, D.C. Dulles Intl Airport to Ko Samui that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Washington, D.C.Ko Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

Wed 10/1

9:00 pm-10:10 am

2 stops26h 10m

Ko Samui

Fri 10/31

4:30 pm-4:55 pm

2 stops35h 25m

$1,174

Washington, D.C.Ko Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

Sat 11/29

1:30 pm-8:05 am

2 stops30h 35m

Ko Samui

Sun 1/25

1:25 pm-11:45 am

2 stops34h 20m

$1,176

Washington, D.C.Ko Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

Wed 10/1

9:00 pm-10:10 am

2 stops26h 10m

Ko Samui

Fri 10/31

4:30 pm-4:55 pm

2 stops35h 25m

$1,241

Washington, D.C.Ko Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

Thu 9/25

1:30 pm-8:15 am

2 stops31h 45m

Ko Samui

Mon 9/29

4:25 pm-11:45 am

2 stops54h 20m

$1,251

Washington, D.C.Ko Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

Mon 1/12

1:30 pm-6:15 pm

2 stops40h 45m

Ko Samui

Tue 2/3

8:15 am-7:15 pm

2 stops47h 00m

$1,296

Washington, D.C.Ko Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

Wed 10/1

9:20 pm-2:45 pm

3 stops30h 25m

Ko Samui

Fri 10/31

7:00 pm-8:05 pm

3 stops36h 05m

$1,443

Washington, D.C.Ko Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

Sat 11/29

1:30 pm-8:10 am

2 stops30h 40m

Ko Samui

Fri 1/30

7:10 pm-7:15 pm

2 stops36h 05m

$1,505

Washington, D.C.Ko Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

Sat 11/29

8:05 pm-3:40 pm

2 stops31h 35m

Ko Samui

Fri 1/30

5:25 pm-3:55 pm

2 stops34h 30m

$1,538

Washington, D.C.Ko Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

Wed 10/1

10:55 am-2:45 pm

2 stops40h 50m

Ko Samui

Fri 10/31

8:45 pm-8:05 pm

3 stops34h 20m

$1,578

Washington, D.C.Ko Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

Thu 10/30

9:05 pm-10:40 am

2 stops26h 35m

Ko Samui

Mon 12/29

3:50 pm-3:55 pm

2 stops36h 05m

$1,697

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. Dulles Intl Airport 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 day to depart on your flight to Ko Samui?

Our data shows that Wednesday is the least expensive day to fly to Ko Samui. Tickets to fly out on this day can be as low as $325. Flights from Washington, D.C. Dulles Intl Airport to Ko Samui on a Sunday will generally be more expensive and average around $714. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

What is the cheapest time of day to depart on your flight to Ko Samui?

Our data shows that the cheapest Washington, D.C. Dulles Intl Airport to Ko Samui flights are usually those with departure times in the evening. Our users have found flights to Ko Samui in the evening for as low as $286. At noon is when there is more demand to fly to Ko Samui, so prices are often more expensive at around $399 per ticket.

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

Are you open to changing your travel dates? Check out the ideal times to fly from Washington, D.C. Dulles Intl Airport 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. Dulles Intl Airport to Ko Samui (IAD to USM) flight deals and tips

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

Direct flights

None
There are no direct flights from Washington, D.C. Dulles Intl Airport to Ko Samui. There are no popular flight routes from Washington, D.C. Dulles Intl Airport to Ko Samui.
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  • How far is Washington, D.C. Dulles Intl to Ko Samui by plane?

    Ko Samui is 9077.6 mi away from Washington, D.C. Dulles Intl. By plane, this route typically takes 26h 10m.

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

    Prices for flights from Washington, D.C. Dulles Intl Airport to Ko Samui Airport refresh daily.

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

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Washington, D.C. Dulles Intl Airport to Ko Samui Airport.

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

    The travel and health documents required for your trip to Ko Samui Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Ko Samui Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

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?

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Washington, D.C. to Ko Samui for you.

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

momondo does allow users to show only those flights to Ko Samui from Washington, D.C. which offer a flexible booking policy as well as other useful filters and features.

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

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Ko Samui from Washington, D.C..

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 offers price alerts on flights to Ko Samui from Washington, D.C.. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

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