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

According to our data, American Airlines have had the least number of delays on this route over the last 12 months; with about 22% of their flights experiencing any sort of delay.

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

Historically, on average around 23% 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 130 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?

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

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

Prices for flights from Washington, D.C. Reagan-National Airport to Ko Samui Airport were last updated today.

How old do you have to be to fly from Washington, D.C. Reagan-National 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. Reagan-National 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.

$947 Cheap Flights from Washington, D.C. Reagan-National Airport to Ko Samui in 2026

1 adult

0 bags

Save money when you book flights with momondo

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Not ready to book? to track prices.

Search flight deals

Find the cheapest flights from Washington, D.C. Reagan-National Airport to Ko Samui

Round-trip

One-way

Cheap round-trip flights

Enter your travel dates to find the best prices.

10:15 am - 7:40 pm

DCA

USM

46h 25m

2 stops

11:55 am - 9:04 am

USM

DCA

56h 09m

2 stops

$1,774Cathay Pacific

Mon, Aug 31 - Sat, Sep 19

6:59 pm - 7:40 pm

DCA

USM

37h 41m

2 stops

11:55 am - 8:00 pm

USM

DCA

43h 05m

2 stops

$1,788Cathay Pacific

Wed, Sep 2 - Thu, Sep 17

5:35 pm - 7:40 pm

DCA

USM

39h 05m

2 stops

11:55 am - 8:00 pm

USM

DCA

43h 05m

2 stops

$1,816Multiple Airlines

Wed, Sep 2 - Thu, Sep 17

4:20 pm - 11:05 am

DCA

USM

31h 45m

3 stops

9:00 pm - 9:55 pm

USM

DCA

35h 55m

3 stops

$1,824Multiple Airlines

Tue, Jun 2 - Tue, Jun 9

10:14 am - 7:40 pm

DCA

USM

46h 26m

2 stops

11:55 am - 12:44 pm

USM

DCA

35h 49m

2 stops

$1,876Cathay Pacific

Tue, Jun 2 - Tue, Jun 9

8:40 pm - 12:45 pm

DCA

USM

29h 05m

3 stops

11:55 am - 8:53 am

USM

DCA

31h 58m

2 stops

$2,013Multiple Airlines

Tue, Jun 2 - Tue, Jun 9

8:40 pm - 7:40 pm

DCA

USM

36h 00m

2 stops

3:50 pm - 12:44 pm

USM

DCA

31h 54m

3 stops

$2,250Multiple Airlines

Tue, May 19 - Sun, May 24

8:40 pm - 7:40 pm

DCA

USM

36h 00m

2 stops

6:00 am - 7:59 am

USM

DCA

36h 59m

3 stops

$2,504Cathay Pacific

Tue, May 19 - Sun, May 24

12:31 pm - 7:40 pm

DCA

USM

44h 09m

2 stops

11:55 am - 11:58 pm

USM

DCA

47h 03m

2 stops

$2,553Cathay Pacific

Thu, Oct 15 - Mon, Oct 19

8:40 pm - 7:40 pm

DCA

USM

36h 00m

2 stops

11:55 am - 12:44 pm

USM

DCA

35h 49m

2 stops

$2,575Cathay Pacific

Tue, May 19 - Sun, May 24

Cathay Pacific flights from Washington, D.C. Reagan-National Airport to Ko Samui

Our best Cathay Pacific deals on Washington, D.C. Reagan-National Airport to Ko Samui flight tickets

Cathay Pacific

Aug 31

DCA10:15 amWashington, D.C. Reagan-National

46h 25m

2 stops

USM7:40 pmKo Samui

Sep 19

USM11:55 amKo Samui

56h 09m

2 stops

DCA9:04 amWashington, D.C. Reagan-National

$1,774

Cathay Pacific

Sep 2

DCA6:59 pmWashington, D.C. Reagan-National

37h 41m

2 stops

USM7:40 pmKo Samui

Sep 17

USM11:55 amKo Samui

43h 05m

2 stops

DCA8:00 pmWashington, D.C. Reagan-National

$1,788

Cathay Pacific

Jun 2

DCA10:14 amWashington, D.C. Reagan-National

46h 26m

2 stops

USM7:40 pmKo Samui

Jun 9

USM11:55 amKo Samui

35h 49m

2 stops

DCA12:44 pmWashington, D.C. Reagan-National

$1,876

momondo Fare Finder

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

Fly to

Route

Depart

Return

Price

Cheapest round-trip

Washington, D.C.Ko Samui

DCA - USM

DCAUSM

Washington, D.C. Reagan-National

Mon 8/31

10:15 am-7:40 pm

2 stops46h 25m

Ko Samui

Sat 9/19

11:55 am-9:04 am

2 stops56h 09m

$1,774

Washington, D.C.Ko Samui

DCA - USM

DCAUSM

Washington, D.C. Reagan-National

Wed 9/2

6:59 pm-7:40 pm

2 stops37h 41m

Ko Samui

Thu 9/17

11:55 am-8:00 pm

2 stops43h 05m

$1,788

Washington, D.C.Ko Samui

DCA - USM

DCAUSM

Washington, D.C. Reagan-National

Wed 9/2

5:35 pm-7:40 pm

2 stops39h 05m

Ko Samui

Thu 9/17

11:55 am-8:00 pm

2 stops43h 05m

$1,816

Washington, D.C.Ko Samui

DCA - USM

DCAUSM

Washington, D.C. Reagan-National

Tue 6/2

4:20 pm-11:05 am

3 stops31h 45m

Ko Samui

Tue 6/9

9:00 pm-9:55 pm

3 stops35h 55m

$1,824

Washington, D.C.Ko Samui

DCA - USM

DCAUSM

Washington, D.C. Reagan-National

Tue 6/2

10:14 am-7:40 pm

2 stops46h 26m

Ko Samui

Tue 6/9

11:55 am-12:44 pm

2 stops35h 49m

$1,876

Quickest round-trip

Washington, D.C.Ko Samui

DCA - USM

DCAUSM

Washington, D.C. Reagan-National

Tue 6/2

8:40 pm-12:45 pm

3 stops29h 05m

Ko Samui

Tue 6/9

11:55 am-8:53 am

2 stops31h 58m

$2,013

Washington, D.C.Ko Samui

DCA - USM

DCAUSM

Washington, D.C. Reagan-National

Tue 5/19

8:40 pm-7:40 pm

2 stops36h 00m

Ko Samui

Sun 5/24

3:50 pm-12:44 pm

3 stops31h 54m

$2,250

Washington, D.C.Ko Samui

DCA - USM

DCAUSM

Washington, D.C. Reagan-National

Tue 5/19

8:40 pm-7:40 pm

2 stops36h 00m

Ko Samui

Sun 5/24

6:00 am-7:59 am

3 stops36h 59m

$2,504

Washington, D.C.Ko Samui

DCA - USM

DCAUSM

Washington, D.C. Reagan-National

Thu 10/15

12:31 pm-7:40 pm

2 stops44h 09m

Ko Samui

Mon 10/19

11:55 am-11:58 pm

2 stops47h 03m

$2,553

Washington, D.C.Ko Samui

DCA - USM

DCAUSM

Washington, D.C. Reagan-National

Tue 5/19

8:40 pm-7:40 pm

2 stops36h 00m

Ko Samui

Sun 5/24

11:55 am-12:44 pm

2 stops35h 49m

$2,575

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 12 resultsSorted by cheapest first

How to get the cheapest flight ticket from Washington, D.C. Reagan-National 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

Airlines

Delays

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

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

When to book flights from Washington, D.C. Reagan-National Airport to Ko Samui

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

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

Fastest flight time	36h 00m
Direct flights	None

The fastest flight from Washington, D.C. Reagan-National Airport to Ko Samui takes 36h 00m

There are no direct flights from Washington, D.C. Reagan-National Airport to Ko Samui. There are no popular flight routes from Washington, D.C. Reagan-National Airport to Ko Samui.

Search flight deals

Frequently asked questions about flying from Washington, D.C. Reagan-National Airport to Ko Samui

How far is Washington, D.C. Reagan-National to Ko Samui by plane?
There are 9082.9 mi between Washington, D.C. Reagan-National and Ko Samui. 36h 00m is a normal flight duration for this route.
When did momondo last update prices for flights from Washington, D.C. Reagan-National Airport to Ko Samui Airport?
Prices for flights from Washington, D.C. Reagan-National Airport to Ko Samui Airport were last updated today.
How old do you have to be to fly from Washington, D.C. Reagan-National 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. Reagan-National 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 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?

Finding the right flight to Ko Samui from Washington, D.C. is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to Ko Samui quick and easy, saving you time and money.

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

Flights from Washington, D.C. to Ko Samui with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

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?

Price alerts on flights to Ko Samui from Washington, D.C. are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

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.

Start using Trips

Find my bookings

Get notified when prices go down

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

1 adult

Mon 5/18

Mon 5/25

Email me momondo's favorite deals

By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to Thailand

Nearby airports

Cabin classes

Other Thailand destinations

Other flights from Washington, D.C. Reagan-National Airport

Complete your trip

Feeling lucky

Cheap flights from Washington, D.C. Reagan-National Airport to Ko Samui from $947

Big names and deals

Big names and deals

Filter for what you want

Filter for what you want

Trusted and free

Trusted and free

Price Alerts

Price Alerts

Find the cheapest flights from Washington, D.C. Reagan-National Airport to Ko Samui

Cheap round-trip flights

Cheap one-way flights

Cathay Pacific flights from Washington, D.C. Reagan-National Airport to Ko Samui

Our best Cathay Pacific deals on Washington, D.C. Reagan-National Airport to Ko Samui flight tickets

momondo Fare Finder

Use the filters below to find and compare flights from Washington, D.C. Reagan-National 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. Reagan-National Airport to Ko Samui

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

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

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

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

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

When to book flights from Washington, D.C. Reagan-National Airport to Ko Samui

Cheap Washington, D.C. Reagan-National Airport to Ko Samui (DCA to USM) flight deals and tips

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

Fastest flight time

Direct flights

Frequently asked questions about flying from Washington, D.C. Reagan-National Airport to Ko Samui

Traveling to a place near Ko Samui?

Why use momondo?

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

Cabin classes currently available on flights to Ko Samui

List of cabin classes available on flights landing in Ko Samui. Availability may vary depending on flight origin and airline.

Popular cities in Thailand

Popular flights according to clicks in the last 7 days on momondo

Fly to other destinations from Washington, D.C. Reagan-National Airport

According to popular flight searches on momondo this year

Complete your trip to Ko Samui

Explore popular destinations other users love

According to popular flight searches on momondo this year