$709+ 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 8/14. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — USM
Jun 19 — Jun 261
1 adult, Economy
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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
Keep the following information in mind while searching for District of Columbia to Ko Samui flight deals. Data was last updated June 14, 2025.
Round-trip from | $1,207 (Gotogate) |
|---|---|
One-way from | $709 (FlightHub) |
Find 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 June 14, 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 June 14, 2025.
This Gotogate deal was found by Cheapflights users on 6/13. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/249:40 pmIAD - USM
2 stops32h 10mTurkish Airlines
Mon 10/64:25 pmUSM - IAD
2 stops38h 20mTurkish Airlines
Deal found 6/13![Turkish Airlines logo]()
$1,207
This FlightHub deal was found by Cheapflights users on 6/12. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/19:00 pmIAD - USM
2 stops27h 05mMultiple Airlines
Fri 10/316:15 pmUSM - IAD
2 stops33h 40mMultiple Airlines
Deal found 6/12![Multiple Airlines logo]()
$1,326
This Emirates deal was found by Cheapflights users on 6/13. 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 Emirates is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/2910:30 amIAD - USM
2 stops38h 35mEmirates
Fri 1/308:30 amUSM - IAD
2 stops35h 40mEmirates
Deal found 6/13![Emirates logo]()
$1,480
This oojo deal was found by Cheapflights users on 6/13. 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.
Sun 8/248:59 amDCA - USM
2 stops46h 16mSingapore Airlines
Mon 10/61:30 pmUSM - DCA
2 stops42h 44mSingapore Airlines
Deal found 6/13![Singapore Airlines logo]()
$1,690
This IEagle deal was found by Cheapflights users on 6/12. 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 IEagle is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/269:30 pmIAD - USM
2 stops45h 40mEtihad Airways
Mon 1/56:15 pmUSM - IAD
2 stops33h 50mEtihad Airways
Deal found 6/12![Etihad Airways logo]()
$1,693
This FlightHub deal was found by Cheapflights users on 6/12. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/179:00 pmIAD - USM
2 stops29h 10mQatar Airways
Fri 7/49:00 pmUSM - IAD
2 stops29h 40mQatar Airways
Deal found 6/12![Qatar Airways logo]()
$1,734
This Gurufare deal was found by Cheapflights users on 6/13. 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 Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/176:00 amDCA - USM
2 stops25h 35mCathay Pacific
Fri 7/410:55 amUSM - DCA
2 stops34h 54mCathay Pacific
Deal found 6/13![Cathay Pacific logo]()
$2,265
This Gotogate deal was found by Cheapflights users on 6/13. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/2410:20 pmIAD - USM
3 stops27h 25mSWISS
Mon 10/64:25 pmUSM - IAD
2 stops34h 00mSWISS
Deal found 6/13![SWISS logo]()
$2,980
Cheapflights Fare Finder
Customize your flight search to find flights from District of Columbia 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, Cheapflights users made 2,558,603 searches. Data last updated June 14, 2025.
Use the filters below to find and compare flights from District of Columbia to Ko Samui that are best for you.
Fly from
District of Columbia
Fly to
Ko Samui
Route
Depart
Return
Price
Washington, D.C.Ko Samui
IAD - USM
IADUSM
Washington, D.C. Dulles Intl
Sun 8/24
9:40 pm-4:50 pm
2 stops32h 10m
Ko Samui
Mon 10/6
4:25 pm-7:45 pm
2 stops38h 20m
$1,207
Washington, D.C.Ko Samui
IAD - USM
IADUSM
Washington, D.C. Dulles Intl
Sun 7/13
11:00 am-7:35 am
2 stops33h 35m
Ko Samui
Sun 7/20
10:55 am-8:40 am
2 stops32h 45m
$1,653
Washington, D.C.Ko Samui
DCA - USM
DCAUSM
Washington, D.C. Reagan-National
Sun 8/24
8:59 am-6:15 pm
2 stops46h 16m
Ko Samui
Mon 10/6
1:30 pm-9:14 pm
2 stops42h 44m
$1,690
Washington, D.C.Ko Samui
IAD - USM
IADUSM
Washington, D.C. Dulles Intl
Tue 6/17
9:00 pm-1:10 pm
2 stops29h 10m
Ko Samui
Fri 7/4
9:00 pm-3:40 pm
2 stops29h 40m
$1,734
Washington, D.C.Ko Samui
DCA - USM
DCAUSM
Washington, D.C. Reagan-National
Sun 7/13
6:00 am-6:35 pm
2 stops49h 35m
Ko Samui
Sun 7/20
10:55 am-8:44 pm
2 stops44h 49m
$2,494
Washington, D.C.Ko Samui
IAD - USM
IADUSM
Washington, D.C. Dulles Intl
Sun 8/24
10:20 pm-12:45 pm
3 stops27h 25m
Ko Samui
Mon 10/6
4:25 pm-3:25 pm
2 stops34h 00m
$2,980
Washington, D.C.Ko Samui
IAD - USM
IADUSM
Washington, D.C. Dulles Intl
Thu 8/14
9:00 pm-1:10 pm
2 stops29h 10m
$709
Washington, D.C.Ko Samui
IAD - USM
IADUSM
Washington, D.C. Dulles Intl
Thu 8/14
9:50 pm-4:35 pm
3 stops31h 45m
$865
Washington, D.C.Ko Samui
DCA - USM
DCAUSM
Washington, D.C. Reagan-National
Thu 8/14
6:58 pm-6:35 pm
2 stops36h 37m
$1,209
Washington, D.C.Ko Samui
DCA - USM
DCAUSM
Washington, D.C. Reagan-National
Thu 8/14
7:20 pm-10:45 am
3 stops28h 25m
$1,221
Showing 1-10 of 11 results
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.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.
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 June 14, 2025.
Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from District of Columbia to Ko Samui as you normally would.
Rainfall in Ko Samui by month
Plan your trip to Ko Samui by taking into account the average rainfall totals by month.
In terms of precipitation, rainfall in Ko Samui ranges from 2.3 - 19.3 inches per month. November is typically the wettest month, when rainfall can reach 19.3 in. February is typically the driest time to visit Ko Samui when rainfall is around 2.3 in.
Temperature in Ko Samui by month
Plan your trip to Ko Samui by taking into account the average temperature totals by month.
If weather is an important factor for your trip to Ko Samui, use this chart to help with planning. For those seeking warmer temperatures, April is the ideal time of year to visit, when temperatures reach an average of 84.2 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 80.6 F).
Reviews of airlines servicing Ko Samui
Get insights into the airlines that provide service to Ko Samui. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Ko Samui. Reviews last updated June 14, 2025.
Overall
8.1
Boarding
8.1
Crew
8.3
Food
7.8
Comfort
8.0
Entertainment
8.2
Reviews
1 / 20
4.0
OkayAnonymous,Dec 2024
IAD - DXB
Overall
8.1
Boarding
8.1
Crew
8.3
Food
7.8
Comfort
8.0
Entertainment
8.2
Reviews
1 / 20
4.0
OkayAnonymous,Dec 2024
IAD - DXB
Overall
8.1
Boarding
8.1
Crew
8.3
Food
7.8
Comfort
8.0
Entertainment
8.2
Reviews
1 / 20
4.0
OkayAnonymous,Dec 2024
IAD - DXB
Overall
8.1
Boarding
8.1
Crew
8.3
Food
7.8
Comfort
8.0
Entertainment
8.2
Reviews
1 / 20
4.0
OkayAnonymous,Dec 2024
IAD - DXB
Overall
8.1
Boarding
8.1
Crew
8.3
Food
7.8
Comfort
8.0
Entertainment
8.2
Reviews
1 / 20
4.0
OkayAnonymous,Dec 2024
IAD - DXB
Overall
8.1
Boarding
8.1
Crew
8.3
Food
7.8
Comfort
8.0
Entertainment
8.2
Reviews
1 / 20
4.0
OkayAnonymous,Dec 2024
IAD - DXB
Related info for your journey
Find useful and relevant information for your journey from District of Columbia to Ko Samui. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
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Ko Pha Ngan