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SEP to USM: distance & flight time
Stephenville (Stephenville Clark Regional Airport) → Ko Samui (Samui Airport)
9,310 mi
14,983 km · 8,090 nm
18h 43m
estimated nonstop flight time
+12h
time difference · heading northwest
See live SEP→USM fares Phone-only fares on this route — call free
Flight time details
9,310 miles nonstop takes roughly 18h 43m gate to gate, flying northwest. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 12-hour time gain when reading arrival times on your ticket.
The two airports
- SEP — Stephenville Clark Regional Airport · Stephenville, United States
- USM — Samui Airport · Ko Samui, Thailand
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 SEP
- MWL · Mineral Wells Airport40 mi away
- DFW · Dallas Fort Worth International Airport81 mi away
- BKD · Stephens County Airport54 mi away
- FWH · NAS Fort Worth JRB/Carswell Field57 mi away
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
Frequently asked questions
How far is SEP from USM?
The flight distance from Stephenville (SEP) to Ko Samui (USM) is 9,310 miles (14,983 km, 8,090 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from SEP to USM?
A nonstop flight takes about 18h 43m 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 Stephenville and Ko Samui?
Ko Samui is 12 hours ahead of Stephenville.
What is the cheapest way to fly from SEP to USM?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on SEP–USM that never appear on search engines, with no booking fees.