Cheap Flights from Washington (IAD) to Samui Intl. Airport (USM)

Popular airlines from Washington Dulles Intl. Airport (IAD) to Samui Intl. Airport (USM)

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Frequently asked questions

Is it cheaper to buy a plane ticket from Washington Dulles Intl. Airport (IAD) to USM last minute?
When it's time to book your flights, being prepared pays dividends. While you may be able to find a last-minute deal on an IAD to USM flight, prices usually don't get cheaper as the departure date nears. Based on flight pricing and demand studies in 2022, we have found that the sweet spot to lock in a domestic flight is between 28 – 35 days in advance. For international travel it's three to four months.
What airports do you fly into for Koh Samui from Washington?
Washington to Koh Samui flights land at Ko Samui Airport (USM). Drop your suitcase off at your hotel and then head out to see some of the city's noteworthy sights, such as Namuang Waterfall 1 and Hin Ta and Hin Yai. The airport is around 10 kilometers northeast of central Koh Samui.
Can I change the date of my flight from IAD to USM?
It's a snap to make amendments to your Dulles Intl. Airport to Ko Samui Airport (USM) journey yourself. Access your details via the Expedia Trips portal and choose "change flight." Look for new flights and secure the one that better fits your plans. You'll see an estimate of your flight change fee, if applicable. You can also use our Customer Service portal to connect with our Virtual Agent and get answers to your questions.

Travel information

Origin airport
Washington Dulles Intl.
Destination airport
Samui Intl. Airport
Distance
14530 km

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