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USM to PSM: distance & flight time
Ko Samui (Samui Airport) → Portsmouth (Portsmouth International at Pease Airport)
8,756 mi
14,091 km · 7,608 nm
17h 38m
estimated nonstop flight time
-11h
time difference · heading north
See live USM→PSM fares Phone-only fares on this route — call free
Flight time details
8,756 miles nonstop takes roughly 17h 38m 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
- PSM — Portsmouth International at Pease Airport · Portsmouth, 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 PSM
- BOS · General Edward Lawrence Logan International Airport50 mi away
- LWM · Lawrence Municipal Airport29 mi away
- MHT · Manchester-Boston Regional Airport33 mi away
- BVY · Beverly Municipal Airport34 mi away
Frequently asked questions
How far is USM from PSM?
The flight distance from Ko Samui (USM) to Portsmouth (PSM) is 8,756 miles (14,091 km, 7,608 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from USM to PSM?
A nonstop flight takes about 17h 38m 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 Portsmouth?
Portsmouth is 11 hours behind Ko Samui.
What is the cheapest way to fly from USM to PSM?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on USM–PSM that never appear on search engines, with no booking fees.