Need help booking?
Unpublished phone-only deals available
OSN to KSO: distance & flight time
Osan (Osan Air Base) → Kastoria (Kastoria National Airport)
5,314 mi
8,552 km · 4,618 nm
10h 53m
estimated nonstop flight time
-7h
time difference · heading northwest
See live OSN→KSO fares Phone-only fares on this route — call free
Flight time details
5,314 miles nonstop takes roughly 10h 53m 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
- OSN — Osan Air Base · Osan, South Korea
- KSO — Kastoria National Airport · Kastoria, Greece
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 OSN
- ICN · Incheon International Airport41 mi away
- SWU · Suwon Airport10 mi away
- SSN · Seoul Air Base (K-16)25 mi away
- GMP · Gimpo International Airport35 mi away
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
Frequently asked questions
How far is OSN from KSO?
The flight distance from Osan (OSN) to Kastoria (KSO) is 5,314 miles (8,552 km, 4,618 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from OSN to KSO?
A nonstop flight takes about 10h 53m gate to gate. Actual time varies with winds, routing and season — eastbound transatlantic flights, for example, are usually faster than the return.
Are there nonstop flights from OSN to KSO?
Nonstop service on OSN–KSO depends on the season and the day of week. Run the fare search on this page with the nonstop filter applied to see current direct options; when there is no nonstop, a single connection through a carrier hub adds roughly 2–4 hours to the 10h 53m nonstop estimate.
What is the time difference between Osan and Kastoria?
Kastoria is 7 hours behind Osan.
What is the cheapest way to fly from OSN to KSO?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on OSN–KSO that never appear on search engines, with no booking fees.
Why are some OSN to KSO fares phone-only?
Consolidator contracts let us sell certain OSN–KSO tickets below the price airlines permit us to publish online, so those fares can only be quoted over the phone. Call the travel desk and an agent will check phone-only inventory for your dates.