Nonstop flight route between Fort Sill, Oklahoma, United States and Forrest, Western Australia, Australia:
Departure Airport:

Arrival Airport:

Distance from FSI to FOS:
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- About this route
- FSI Airport Information
- FOS Airport Information
- Facts about FSI
- Facts about FOS
- 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 FOS
- List of Nearest Airports to FOS
- Map of Furthest Airports from FOS
- List of Furthest Airports from FOS
About this route:
A direct, nonstop flight between Henry Post Army Airfield (FSI), Fort Sill, Oklahoma, United States and Forrest Airport (FOS), Forrest, Western Australia, Australia would travel a Great Circle distance of 9,744 miles (or 15,682 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 Forrest 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 Forrest 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: | FOS / YFRT |
Airport Name: | Forrest Airport |
Location: | Forrest, Western Australia, Australia |
GPS Coordinates: | 30°50'17"S by 128°6'54"E |
Operator/Owner: | Fayburn Pty Ltd. |
Airport Type: | Public |
Elevation: | 511 feet (156 meters) |
# of Runways: | 2 |
View all routes: | Routes from FOS |
More Information: | FOS Maps & Info |
Facts about Henry Post Army Airfield (FSI):
- As a result of the United State's entry into World War I, Fort Sill was selected for a primary pilot school.
- The Fort Sill Army Radar Approach Control is the Army's Second busiest Air Traffic Control Facility, providing Radar Approach Control service to Henry Post Army Air Field, Lawton/Fort Sill Regional Airport, Duncan/Haliburton Airport and many smaller airports in the area.
- 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.
- Henry Post Army Airfield (FSI) currently has only 1 runway.
- 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.
- 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.
- By the late 1920s, the World War I tarpaper buildings were rotting and turning into fire hazards.
Facts about Forrest Airport (FOS):
- The furthest airport from Forrest Airport (FOS) is L.F. Wade International Airport (BDA), which is located 11,677 miles (18,792 kilometers) away in Ferry Reach (near Hamilton), Bermuda.
- Forrest Airport (FOS) has 2 runways.
- The closest airport to Forrest Airport (FOS) is Ceduna Airport (CED), which is located 341 miles (550 kilometers) ESE of FOS.
- Because of Forrest Airport's relatively low elevation of 511 feet, planes can take off or land at Forrest 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.