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USM to DCA: distance & flight time
Ko Samui (Samui Airport) → Washington (Ronald Reagan Washington National Airport)
9,087 mi
14,625 km · 7,897 nm
18h 17m
estimated nonstop flight time
-11h
time difference · heading north
See live USM→DCA fares Phone-only fares on this route — call free
Flight time details
9,087 miles nonstop takes roughly 18h 17m gate to gate, flying north. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 11-hour time set-back when reading arrival times on your ticket.
The two airports
- USM — Samui Airport · Ko Samui, Thailand
- DCA — Ronald Reagan Washington National Airport · Washington, United States
Distances are great-circle ("as the crow flies") — the same basis airlines use for frequent-flyer miles.
Alternate airports can cut this fare
Flying from or into a nearby airport is the #1 trick our agents use to beat online prices. Call and we'll compare every combination on one call.
Near USM
- URT · Surat Thani Airport69 mi away
- NST · Nakhon Si Thammarat Airport70 mi away
- CJM · Chumphon Airport93 mi away
- UNN · Ranong Airport102 mi away
Near DCA
Frequently asked questions
How far is USM from DCA?
The flight distance from Ko Samui (USM) to Washington (DCA) is 9,087 miles (14,625 km, 7,897 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from USM to DCA?
A nonstop flight takes about 18h 17m gate to gate. Actual time varies with winds, routing and season — eastbound transatlantic flights, for example, are usually faster than the return.
What is the time difference between Ko Samui and Washington?
Washington is 11 hours behind Ko Samui.
What is the cheapest way to fly from USM to DCA?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on USM–DCA that never appear on search engines, with no booking fees.