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 19% of their flights experiencing any sort of delay.

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

Historically, on average around 20% 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 129 minutes.

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.

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

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.

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.

$188 Cheap Flights from Washington, D.C. Reagan-National Airport to Ko Samui in 2025/26

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.

9:59 am - 7:35 pm

DCA

USM

45h 36m2 stops

11:40 am - 10:59 pm

USM

DCA

47h 19m2 stops

$1,762Cathay Pacific

Mon, Jan 12 - Mon, Jan 26

1:34 pm - 7:35 pm

DCA

USM

42h 01m2 stops

11:40 am - 8:00 pm

USM

DCA

44h 20m2 stops

$2,290Multiple Airlines

Thu, Jan 8 - Wed, Jan 14

6:42 pm - 7:35 pm

DCA

USM

36h 53m2 stops

11:40 am - 5:08 pm

USM

DCA

41h 28m2 stops

$2,337Cathay Pacific

Fri, Jan 9 - Wed, Jan 14

9:35 am - 9:20 pm

DCA

USM

47h 45m3 stops

11:40 am - 10:03 am

USM

DCA

34h 23m2 stops

$2,356Cathay Pacific

Fri, Jan 9 - Wed, Jan 14

6:10 am - 9:20 pm

DCA

USM

27h 10m3 stops

11:40 am - 5:08 pm

USM

DCA

41h 28m2 stops

$2,655Cathay Pacific

Thu, Jan 8 - Wed, Jan 14

9:35 am - 9:20 pm

DCA

USM

47h 45m3 stops

7:55 am - 11:00 pm

USM

DCA

27h 05m3 stops

$3,821Cathay Pacific

Fri, Jan 9 - Wed, Jan 14

6:10 am - 9:20 pm

DCA

USM

27h 10m3 stops

7:55 am - 11:00 pm

USM

DCA

27h 05m3 stops

$4,120Cathay Pacific

Thu, Jan 8 - Wed, Jan 14

4:10 pm - 11:00 am

DCA

USM

30h 50m3 stops

1:25 pm - 10:10 am

USM

DCA

32h 45m3 stops

$5,001Multiple Airlines

Sat, Dec 27 - Fri, Jan 2

6:00 am - 7:35 pm

DCA

USM

25h 35m2 stops

11:40 am - 10:10 am

USM

DCA

34h 30m2 stops

$6,610Multiple Airlines

Fri, Dec 26 - Fri, Jan 2

9:59 am - 7:35 pm

DCA

USM

45h 36m2 stops

11:40 am - 10:34 am

USM

DCA

34h 54m2 stops

$6,709Cathay Pacific

Sat, Dec 27 - Fri, Jan 2

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

Jan 12

DCA9:59 amWashington, D.C. Reagan-National

45h 36m

2 stops

USM7:35 pmKo Samui

Jan 26

USM11:40 amKo Samui

47h 19m

2 stops

DCA10:59 pmWashington, D.C. Reagan-National

$1,762

Find similar

Cathay Pacific

Jan 8

DCA6:42 pmWashington, D.C. Reagan-National

36h 53m

2 stops

USM7:35 pmKo Samui

Feb 4

USM11:40 amKo Samui

41h 28m

2 stops

DCA5:08 pmWashington, D.C. Reagan-National

$2,205

Find similar

Cathay Pacific

Jan 9

DCA6:42 pmWashington, D.C. Reagan-National

36h 53m

2 stops

USM7:35 pmKo Samui

Jan 14

USM11:40 amKo Samui

41h 28m

2 stops

DCA5:08 pmWashington, D.C. Reagan-National

$2,337

Find similar

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

Washington, D.C.Ko Samui

DCA - USM

DCAUSM

Washington, D.C. Reagan-National

Mon 1/12

9:59 am-7:35 pm

2 stops45h 36m

Ko Samui

Mon 1/26

11:40 am-10:59 pm

2 stops47h 19m

$1,762

Washington, D.C.Ko Samui

DCA - USM

DCAUSM

Washington, D.C. Reagan-National

Thu 1/8

1:34 pm-7:35 pm

2 stops42h 01m

Ko Samui

Wed 1/14

11:40 am-8:00 pm

2 stops44h 20m

$2,290

Washington, D.C.Ko Samui

DCA - USM

DCAUSM

Washington, D.C. Reagan-National

Fri 1/9

6:42 pm-7:35 pm

2 stops36h 53m

Ko Samui

Wed 1/14

11:40 am-5:08 pm

2 stops41h 28m

$2,337

Washington, D.C.Ko Samui

DCA - USM

DCAUSM

Washington, D.C. Reagan-National

Fri 1/9

9:35 am-9:20 pm

3 stops47h 45m

Ko Samui

Wed 1/14

11:40 am-10:03 am

2 stops34h 23m

$2,356

Washington, D.C.Ko Samui

DCA - USM

DCAUSM

Washington, D.C. Reagan-National

Thu 1/8

6:10 am-9:20 pm

3 stops27h 10m

Ko Samui

Wed 1/14

11:40 am-5:08 pm

2 stops41h 28m

$2,655

Washington, D.C.Ko Samui

DCA - USM

DCAUSM

Washington, D.C. Reagan-National

Fri 1/9

9:35 am-9:20 pm

3 stops47h 45m

Ko Samui

Wed 1/14

7:55 am-11:00 pm

3 stops27h 05m

$3,821

Washington, D.C.Ko Samui

DCA - USM

DCAUSM

Washington, D.C. Reagan-National

Thu 1/8

6:10 am-9:20 pm

3 stops27h 10m

Ko Samui

Wed 1/14

7:55 am-11:00 pm

3 stops27h 05m

$4,120

Washington, D.C.Ko Samui

DCA - USM

DCAUSM

Washington, D.C. Reagan-National

Sat 12/27

4:10 pm-11:00 am

3 stops30h 50m

Ko Samui

Fri 1/2

1:25 pm-10:10 am

3 stops32h 45m

$5,001

Washington, D.C.Ko Samui

DCA - USM

DCAUSM

Washington, D.C. Reagan-National

Fri 12/26

6:00 am-7:35 pm

2 stops25h 35m

Ko Samui

Fri 1/2

11:40 am-10:10 am

2 stops34h 30m

$6,610

Washington, D.C.Ko Samui

DCA - USM

DCAUSM

Washington, D.C. Reagan-National

Sat 12/27

9:59 am-7:35 pm

2 stops45h 36m

Ko Samui

Fri 1/2

11:40 am-10:34 am

2 stops34h 54m

$6,709

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

Prices

Airlines

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. Reagan-National 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. Reagan-National 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. 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	33h 10m
Direct flights	None

The fastest flight from Washington, D.C. Reagan-National Airport to Ko Samui takes 33h 10m

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

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. 33h 10m 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 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?

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

Fri 1/16

Fri 1/23

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

Airports servicing Thailand

Popular cities in Thailand

Flights to Bangkokfrom $525

Flights to Phuket Cityfrom $579

Flights to Chiang Maifrom $606

Flights to Krabifrom $862

Flights to Surat Thanifrom $812

Flights to Chiang Raifrom $880

Flights to Udon Thanifrom $889

Flights to Hat Yaifrom $1,210

Flights to Khon Kaenfrom $979

Flights to Ubon Ratchathanifrom $1,244

Flights to Tratfrom $1,361

Flights to Mueang Ranongfrom $907

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

Flights from Washington, D.C. Reagan-National to Orlando

Flights from Washington, D.C. Reagan-National to Denver Intl

Flights from Washington, D.C. Reagan-National to New York LaGuardia

Flights from Washington, D.C. Reagan-National to Boston Logan Intl

Flights from Washington, D.C. Reagan-National to Fort Lauderdale

Flights from Washington, D.C. Reagan-National to Palm Beach Intl

Cheap flights from Washington, D.C. Reagan-National Airport to Ko Samui from $759

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 day to depart on your flight to Ko Samui?

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

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

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

Historically, on average around 20% 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 129 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.

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 19% of their flights experiencing any sort of delay.

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

How far is Washington, D.C. Reagan-National to Ko Samui by plane?

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

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