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SUS to USM: distance & flight time
Null (Spirit of St Louis Airport) → Ko Samui (Samui Airport)
9,035 mi
14,541 km · 7,851 nm
18h 11m
estimated nonstop flight time
+12h
time difference · heading north
See live SUS→USM fares Phone-only fares on this route — call free
Flight time details
9,035 miles nonstop takes roughly 18h 11m gate to gate, flying north. 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
- SUS — Spirit of St Louis Airport · Null, 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 SUS
- STL · St Louis Lambert International Airport16 mi away
- ALN · St Louis Regional Airport36 mi away
- BLV · Scott AFB/Midamerica Airport45 mi away
- JEF · Jefferson City Memorial Airport81 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 SUS from USM?
The flight distance from Null (SUS) to Ko Samui (USM) is 9,035 miles (14,541 km, 7,851 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from SUS to USM?
A nonstop flight takes about 18h 11m 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 Null and Ko Samui?
Ko Samui is 12 hours ahead of Null.
What is the cheapest way to fly from SUS to USM?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on SUS–USM that never appear on search engines, with no booking fees.