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FSI to EAS: distance & flight time
Fort Sill (Henry Post Army Air Field (Fort Sill)) → San Sebastian (San Sebastian Airport)
4,923 mi
7,922 km · 4,278 nm
10h 7m
estimated nonstop flight time
+7h
time difference · heading northeast
See live FSI→EAS fares Phone-only fares on this route — call free
Flight time details
4,923 miles nonstop takes roughly 10h 7m gate to gate, flying northeast. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 7-hour time gain when reading arrival times on your ticket.
The two airports
- FSI — Henry Post Army Air Field (Fort Sill) · Fort Sill, United States
- EAS — San Sebastian Airport · San Sebastian, Spain
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 FSI
- LAW · Lawton Fort Sill Regional Airport6 mi away
- DUC · Halliburton Field28 mi away
- HBR · Hobart Regional Airport44 mi away
- SPS · Sheppard Air Force Base-Wichita Falls Municipal Airport46 mi away
Near EAS
- BIQ · Biarritz-Anglet-Bayonne Airport15 mi away
- PNA · Pamplona Airport41 mi away
- BIO · Bilbao Airport56 mi away
- VIT · Vitoria/Foronda Airport57 mi away
Frequently asked questions
How far is FSI from EAS?
The flight distance from Fort Sill (FSI) to San Sebastian (EAS) is 4,923 miles (7,922 km, 4,278 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from FSI to EAS?
A nonstop flight takes about 10h 7m 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 Fort Sill and San Sebastian?
San Sebastian is 7 hours ahead of Fort Sill.
What is the cheapest way to fly from FSI to EAS?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on FSI–EAS that never appear on search engines, with no booking fees.