How often are flights from Washington, D.C. to Ko Samui delayed?

Historically, on average around 19% of flights between Washington, D.C. and Ko Samui have experienced a delay on any given week. The average delay length over the past 12 months has been 77 minutes.

What is the most punctual flight time for Washington, D.C. to Ko Samui flights?

Generally, flights departing in the morning tend to experience fewer delays. Flights at night have, in the past, seen delays more frequently in comparison.

Which airline has the best punctuality record on Washington, D.C. to Ko Samui flights?

According to our data, Southwest have had the least number of delays on this route over the last 12 months; with about 29% of their flights experiencing any sort of delay.

What day of the week experiences the fewest flight delays on this route?

Friday is statistically the day of the week which experiences the fewest number of delays on this flight route. Thursday has historically seen more delays on average compared to the rest of the week.

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.

$90 Cheap Flights from Washington, D.C. Dulles Intl Airport to Ko Samui in 2025/26

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

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2:35 pm - 7:45 am

IAD

USM

29h 10m2 stops

8:50 am - 10:05 am

USM

IAD

60h 15m2 stops

$1,093Etihad Airways

Wed, Mar 4 - Wed, Mar 11

3:35 pm - 7:45 am

IAD

USM

29h 10m2 stops

8:55 am - 9:45 am

USM

IAD

59h 50m2 stops

$1,185Multiple Airlines

Wed, Mar 25 - Mon, Apr 6

2:35 pm - 7:45 am

IAD

USM

29h 10m2 stops

8:15 am - 9:05 am

USM

IAD

36h 50m2 stops

$1,227Etihad Airways

Tue, Jan 27 - Tue, Feb 3

9:40 pm - 8:30 pm

IAD

USM

35h 50m2 stops

6:25 pm - 11:35 am

USM

IAD

28h 10m2 stops

$1,229Turkish Airlines

Sun, Apr 19 - Thu, Apr 23

3:35 pm - 7:10 am

IAD

USM

28h 35m2 stops

9:00 pm - 8:29 pm

USM

IAD

34h 29m3 stops

$1,412Multiple Airlines

Sun, Apr 19 - Thu, Apr 23

10:15 pm - 8:25 pm

IAD

USM

35h 10m2 stops

1:30 pm - 11:35 am

USM

IAD

33h 05m2 stops

$1,419Turkish Airlines

Wed, Mar 25 - Mon, Apr 6

3:35 pm - 8:05 am

IAD

USM

29h 30m2 stops

8:45 am - 9:45 am

USM

IAD

36h 00m3 stops

$1,488Multiple Airlines

Wed, Mar 25 - Mon, Apr 6

2:35 pm - 8:05 am

IAD

USM

29h 30m2 stops

12:00 pm - 10:05 am

USM

IAD

33h 05m3 stops

$1,502Multiple Airlines

Wed, Mar 4 - Wed, Mar 11

2:35 pm - 8:05 am

IAD

USM

29h 30m2 stops

8:30 pm - 8:29 pm

USM

IAD

35h 59m3 stops

$1,553Multiple Airlines

Tue, Jan 27 - Tue, Feb 3

2:35 pm - 11:00 am

IAD

USM

32h 25m3 stops

8:30 pm - 8:29 pm

USM

IAD

35h 59m3 stops

$1,600Multiple Airlines

Tue, Jan 27 - Tue, Feb 3

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

Our best Etihad Airways deals on Washington, D.C. Dulles Intl Airport to Ko Samui flight tickets

Etihad Airways

Mar 4

IAD2:35 pmWashington, D.C. Dulles Intl

29h 10m

2 stops

USM7:45 amKo Samui

Mar 11

USM8:50 amKo Samui

60h 15m

2 stops

IAD10:05 amWashington, D.C. Dulles Intl

$1,093

Find similar

Etihad Airways

Jan 27

IAD2:35 pmWashington, D.C. Dulles Intl

29h 10m

2 stops

USM7:45 amKo Samui

Feb 3

USM8:15 amKo Samui

36h 50m

2 stops

IAD9:05 amWashington, D.C. Dulles Intl

$1,227

Find similar

Etihad Airways

Jan 8

IAD2:35 pmWashington, D.C. Dulles Intl

41h 00m

2 stops

USM7:35 pmKo Samui

Jan 14

USM8:50 amKo Samui

60h 15m

2 stops

IAD9:05 amWashington, D.C. Dulles Intl

$1,675

Find similar

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

Apr 19

IAD9:40 pmWashington, D.C. Dulles Intl

35h 50m

2 stops

USM8:30 pmKo Samui

Apr 23

USM6:25 pmKo Samui

28h 10m

2 stops

IAD11:35 amWashington, D.C. Dulles Intl

$1,229

Find similar

Turkish Airlines

Mar 25

IAD10:15 pmWashington, D.C. Dulles Intl

35h 10m

2 stops

USM8:25 pmKo Samui

Apr 6

USM1:30 pmKo Samui

33h 05m

2 stops

IAD11:35 amWashington, D.C. Dulles Intl

$1,419

Find similar

momondo Fare Finder

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

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Route

Depart

Return

Price

Washington, D.C.Ko Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

Wed 3/4

2:35 pm-7:45 am

2 stops29h 10m

Ko Samui

Wed 3/11

8:50 am-10:05 am

2 stops60h 15m

$1,093

Washington, D.C.Ko Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

Wed 3/25

3:35 pm-7:45 am

2 stops29h 10m

Ko Samui

Mon 4/6

8:55 am-9:45 am

2 stops59h 50m

$1,185

Washington, D.C.Ko Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

Tue 1/27

2:35 pm-7:45 am

2 stops29h 10m

Ko Samui

Tue 2/3

8:15 am-9:05 am

2 stops36h 50m

$1,227

Washington, D.C.Ko Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

Sun 4/19

9:40 pm-8:30 pm

2 stops35h 50m

Ko Samui

Thu 4/23

6:25 pm-11:35 am

2 stops28h 10m

$1,229

Washington, D.C.Ko Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

Sun 4/19

3:35 pm-7:10 am

2 stops28h 35m

Ko Samui

Thu 4/23

9:00 pm-8:29 pm

3 stops34h 29m

$1,412

Washington, D.C.Ko Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

Wed 3/25

10:15 pm-8:25 pm

2 stops35h 10m

Ko Samui

Mon 4/6

1:30 pm-11:35 am

2 stops33h 05m

$1,419

Washington, D.C.Ko Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

Wed 3/25

3:35 pm-8:05 am

2 stops29h 30m

Ko Samui

Mon 4/6

8:45 am-9:45 am

3 stops36h 00m

$1,488

Washington, D.C.Ko Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

Wed 3/4

2:35 pm-8:05 am

2 stops29h 30m

Ko Samui

Wed 3/11

12:00 pm-10:05 am

3 stops33h 05m

$1,502

Washington, D.C.Ko Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

Tue 1/27

2:35 pm-8:05 am

2 stops29h 30m

Ko Samui

Tue 2/3

8:30 pm-8:29 pm

3 stops35h 59m

$1,553

Washington, D.C.Ko Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

Tue 1/27

2:35 pm-11:00 am

3 stops32h 25m

Ko Samui

Tue 2/3

8:30 pm-8:29 pm

3 stops35h 59m

$1,600

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 13 resultsSorted by cheapest first

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

Prices

Delays

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

Fastest flight time	27h 25m
Direct flights	None

The fastest flight from Washington, D.C. Dulles Intl Airport to Ko Samui takes 27h 25m

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.

Search flight deals

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 27h 25m.
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.

Ko Tao

Ko Pha Ngan

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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Cheap flights from Washington, D.C. Dulles Intl Airport to Ko Samui from $1,093

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

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

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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

momondo Fare Finder

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

See travel insights to Ko Samui from

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

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

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

How often are flights from Washington, D.C. to Ko Samui delayed?

Historically, on average around 19% of flights between Washington, D.C. and Ko Samui have experienced a delay on any given week. The average delay length over the past 12 months has been 77 minutes.

What is the most punctual flight time for Washington, D.C. to Ko Samui flights?

Generally, flights departing in the morning tend to experience fewer delays. Flights at night have, in the past, seen delays more frequently in comparison.

What day of the week experiences the fewest flight delays on this route?

Friday is statistically the day of the week which experiences the fewest number of delays on this flight route. Thursday has historically seen more delays on average compared to the rest of the week.

Which airline has the best punctuality record on Washington, D.C. to Ko Samui flights?

According to our data, Southwest have had the least number of delays on this route over the last 12 months; with about 29% of their flights experiencing any sort of delay.

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

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

Fastest flight time

Direct flights

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

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

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

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

Traveling to a place near Ko Samui?

Why use momondo?

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

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

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

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

An easier way to manage your Ko Samui trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to Thailand

Airports servicing Thailand