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

The lowest price advertised for a round-trip flight between National Airport and Ko Samui Airport (USM) is CA $3,262. But you better get a move on. This figure is taken from fares offered within the last 7 days on Expedia for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.

This varies from airline to airline, as each has its own set of terms and conditions. Visit the Customer Service Portal, where there are instructions on how to cancel online.

Select our "No change fees" filter to find flexible travel options for your flight from National Airport to Ko Samui Airport. This allows you to lock in a low rate in advance and still have the freedom to reschedule without any additional fees. Fare adjustments may apply if your new flight is more expensive.

The distance is around 14,600 kilometres. Earplugs? Check. Spare socks? Double check. You'll need to pack all the essentials for this long-haul Arlington to Koh Samui flight.

Unfortunately, there aren't any airlines that fly directly between DCA and Ko Samui Airport. You'll have to book a flight with one or more stops.

Late planners can sometimes nab a bargain, with some of the cheapest airfares from Ronald Reagan Washington National Airport (DCA) to USM appearing a few weeks before the date of departure. If you'd rather book ahead, Expedia compares and updates all the best flight deals continuously — as early as a year in advance in some cases. It depends on the carrier though, as not every airline releases prices so far in advance.