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KSO to PSM: distance & flight time
Kastoria (Kastoria National Airport) → Portsmouth (Portsmouth International at Pease Airport)
4,491 mi
7,227 km · 3,902 nm
9h 16m
estimated nonstop flight time
-7h
time difference · heading northwest
See live KSO→PSM fares Phone-only fares on this route — call free
Flight time details
4,491 miles nonstop takes roughly 9h 16m gate to gate, flying northwest. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 7-hour time set-back when reading arrival times on your ticket.
The two airports
- KSO — Kastoria National Airport · Kastoria, Greece
- 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 KSO
- KZI · Filippos Airport31 mi away
- IOA · Ioannina Airport57 mi away
- OHD · Ohrid St. Paul the Apostle Airport58 mi away
- LRA · Larisa Airport83 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 KSO from PSM?
The flight distance from Kastoria (KSO) to Portsmouth (PSM) is 4,491 miles (7,227 km, 3,902 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from KSO to PSM?
A nonstop flight takes about 9h 16m 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 Kastoria and Portsmouth?
Portsmouth is 7 hours behind Kastoria.
What is the cheapest way to fly from KSO to PSM?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on KSO–PSM that never appear on search engines, with no booking fees.