$517+ Cheap flights from District of Columbia to Ko Samui (USM)
This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 3/12. Fares are subject to change and may not be available on all flights or dates of travel.
Find cheap flights from District of Columbia to Ko Samui with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from District of Columbia to Ko Samui
Cheapest flights from District of Columbia to Ko SamuiExplore the most affordable flight options available from District of Columbia to Ko Samui. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 16, 2025.
Explore the most affordable flight options available from District of Columbia to Ko Samui. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 16, 2025.
This Trip.com deal was found by Cheapflights users on 12/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This Trip.com deal was found by Cheapflights users on 12/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This Mytrip deal was found by Cheapflights users on 12/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This Ovago deal was found by Cheapflights users on 12/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This oojo deal was found by Cheapflights users on 12/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Find flight deals from District of Columbia to Ko Samui
Keep the following information in mind while searching for District of Columbia to Ko Samui flight deals. Data was last updated December 16, 2025.
Most accurate provider | eDreams 3 stars |
|---|---|
Most trusted provider | eDreams 3 stars |
Round-trip from | $1,093 (oojo) |
One-way from | $517 (SmartFares) |
Cheapflights Fare Finder
Use the filters below to find and compare flights from District of Columbia 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 4/8
3:35 pm-7:10 am
2 stops28h 35m
Ko Samui
Sun 4/19
1:30 pm-9:45 am
2 stops31h 15m
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
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
Washington, D.C.Ko Samui
DCA - USM
DCAUSM
Washington, D.C. Reagan-National
Wed 3/4
9:59 am-7:35 pm
2 stops45h 36m
Ko Samui
Wed 3/11
11:40 am-8:01 am
2 stops31h 21m
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
Washington, D.C.Ko Samui
IAD - USM
IADUSM
Washington, D.C. Dulles Intl
Thu 1/8
2:35 pm-7:35 pm
2 stops41h 00m
Ko Samui
Wed 1/14
8:50 am-9:05 am
2 stops60h 15m
Washington, D.C.Ko Samui
IAD - USM
IADUSM
Washington, D.C. Dulles Intl
Fri 6/12
3:35 pm-11:55 am
2 stops33h 20m
Ko Samui
Sat 6/20
5:25 pm-9:45 am
2 stops27h 20m
Washington, D.C.Ko Samui
IAD - USM
IADUSM
Washington, D.C. Dulles Intl
Thu 1/8
8:50 pm-3:40 pm
3 stops30h 50m
Ko Samui
Wed 1/14
9:10 pm-8:00 am
3 stops46h 50m
Washington, D.C.Ko Samui
IAD - USM
IADUSM
Washington, D.C. Dulles Intl
Fri 1/9
10:00 am-3:35 pm
2 stops41h 35m
Ko Samui
Wed 1/14
9:10 pm-7:05 pm
3 stops33h 55m
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
Best time to book a flight from District of Columbia to Ko Samui
Have a flexible travel schedule? Discover the best time to fly to Ko Samui from District of Columbia with our price prediction graph.
Cheapflights Insights
Everything you need to know about your flight from District of Columbia to Ko Samui
What is the cheapest time of day to fly from DC to USM?
Find hourly flight availability from District of Columbia to Ko Samui. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated December 16, 2025.
One of the essential ways to save on airfare from District of Columbia to Ko Samui is to remain as flexible as possible. Flights that are at noon tend to be the most expensive. A flight in the evening could potentially save you up to 37% on airfare.
What is the cheapest day to fly from District of Columbia to Ko Samui?
Use this chart to determine the cheapest time to fly round-trip from District of Columbia to Ko Samui. Price data was last updated on March 30, 2025.
Travelers seeking maximum savings on their District of Columbia to Ko Samui flight should consider departing on Monday at noon when fares are most often at their lowest. Sunday at noon flights should be avoided if possible as fares are typically the most expensive at this time.