Nonstop flight route between Fort Sill, Oklahoma, United States and San Sebastián, Spain:
Departure Airport:

Arrival Airport:

Distance from FSI to EAS:
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- About this route
- FSI Airport Information
- EAS Airport Information
- Facts about FSI
- Facts about EAS
- Map of Nearest Airports to FSI
- List of Nearest Airports to FSI
- Map of Furthest Airports from FSI
- List of Furthest Airports from FSI
- Map of Nearest Airports to EAS
- List of Nearest Airports to EAS
- Map of Furthest Airports from EAS
- List of Furthest Airports from EAS
About this route:
A direct, nonstop flight between Henry Post Army Airfield (FSI), Fort Sill, Oklahoma, United States and San Sebastián Airport (EAS), San Sebastián, Spain would travel a Great Circle distance of 4,923 miles (or 7,922 kilometers).
A Great Circle is the shortest distance between 2 points on a sphere. Because most world maps are flat (but the Earth is round), the route of the shortest distance between 2 points on the Earth will often appear curved when viewed on a flat map, especially for long distances. If you were to simply draw a straight line on a flat map and measure a very long distance, it would likely be much further than if you were to lay a string between those two points on a globe. Because of the large distance between Henry Post Army Airfield and San Sebastián Airport, the route shown on this map most likely appears curved because of this reason.
Try it at home! Get a globe and tightly lay a string between Henry Post Army Airfield and San Sebastián Airport. You'll see that it will travel the same route of the red line on this map!
Departure Airport Information:
IATA / ICAO Codes: | FSI / KFSI |
Airport Name: | Henry Post Army Airfield |
Location: | Fort Sill, Oklahoma, United States |
GPS Coordinates: | 34°38'58"N by 98°24'7"W |
Operator/Owner: | U.S. Army ATCA-ASO |
Airport Type: | Military |
Elevation: | 1189 feet (362 meters) |
# of Runways: | 1 |
View all routes: | Routes from FSI |
More Information: | FSI Maps & Info |
Arrival Airport Information:
IATA / ICAO Codes: | EAS / LESO |
Airport Name: | San Sebastián Airport |
Location: | San Sebastián, Spain |
GPS Coordinates: | 43°21'23"N by 1°47'26"W |
Area Served: | San Sebastián |
Operator/Owner: | Aena |
Airport Type: | Public |
Elevation: | 15 feet (5 meters) |
# of Runways: | 1 |
View all routes: | Routes from EAS |
More Information: | EAS Maps & Info |
Facts about Henry Post Army Airfield (FSI):
- Henry Post Army Airfield was the first home of all Army Aviation Training after World War II before moving to Fort Rucker, Alabama in 1954.
- After returning from combat duty in France, a cadre of the 135th Aero Squadron ) was assigned to Post Field as an observation squadron, supplying aircraft for the United States Army Field Artillery School at Fort Sill and supported Army units at Fort Leavenworth, Kansas.
- The furthest airport from Henry Post Army Airfield (FSI) is Sir Gaëtan Duval Airport (RRG), which is located 10,920 miles (17,575 kilometers) away in Rodrigues Island, Mauritius.
- There are no air units currently stationed at the airfield, however air operations for transient units are provided by permanent party personnel.
- As a result of the United State's entry into World War I, Fort Sill was selected for a primary pilot school.
- The closest airport to Henry Post Army Airfield (FSI) is Lawton–Fort Sill Regional Airport (LAW), which is located only 6 miles (9 kilometers) S of FSI.
- Henry Post Army Airfield (FSI) currently has only 1 runway.
- Although the Signal corps had been supplying Observation aircraft for the United States Army Field Artillery School since 1915.
- Fort Sill has embarked on a new plan to support the museum in providing a more dynamic learning experience for the 200,000 military and civilian personnel who visit each year.
Facts about San Sebastián Airport (EAS):
- The furthest airport from San Sebastián Airport (EAS) is Hood Aerodrome (MRO), which is nearly antipodal to San Sebastián Airport (meaning San Sebastián Airport is almost on the exact opposite side of the Earth from Hood Aerodrome), and is located 12,226 miles (19,676 kilometers) away in Masterton, New Zealand.
- The closest airport to San Sebastián Airport (EAS) is Biarritz – Anglet – Bayonne Airport (BIQ), which is located only 15 miles (25 kilometers) ENE of EAS.
- San Sebastián Airport (EAS) currently has only 1 runway.
- Because of San Sebastián Airport's relatively low elevation of 15 feet, planes can take off or land at San Sebastián Airport at a lower air speed than at airports located at a higher elevation. This is because the air density is higher closer to sea level than it would otherwise be at higher elevations.