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OSN to DEF: distance & flight time
Osan (Osan Air Base) → Dezful (Dezful Airport)
4,343 mi
6,990 km · 3,774 nm
8h 59m
estimated nonstop flight time
-5.5h
time difference · heading west
See live OSN→DEF fares Phone-only fares on this route — call free
Flight time details
4,343 miles nonstop takes roughly 8h 59m gate to gate, flying west. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 5.5-hour time set-back when reading arrival times on your ticket.
The two airports
- OSN — Osan Air Base · Osan, South Korea
- DEF — Dezful Airport · Dezful, Iran
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 DEF
- KHD · Khoram Abad Airport69 mi away
- AWZ · Ahwaz Airport79 mi away
- OMI · Omidiyeh Airport129 mi away
- MRX · Mahshahr Airport137 mi away
Frequently asked questions
How far is OSN from DEF?
The flight distance from Osan (OSN) to Dezful (DEF) is 4,343 miles (6,990 km, 3,774 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from OSN to DEF?
A nonstop flight takes about 8h 59m 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 Osan and Dezful?
Dezful is 5.5 hours behind Osan.
What is the cheapest way to fly from OSN to DEF?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on OSN–DEF that never appear on search engines, with no booking fees.