Nonstop flight route between Aberdeen Proving Ground, Maryland, United States and Fort Sill, Oklahoma, United States:
Departure Airport:

Arrival Airport:

Distance from APG to FSI:
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- About this route
- APG Airport Information
- FSI Airport Information
- Facts about APG
- Facts about FSI
- Map of Nearest Airports to APG
- List of Nearest Airports to APG
- Map of Furthest Airports from APG
- List of Furthest Airports from APG
- Map of Nearest Airports to FSI
- List of Nearest Airports to FSI
- Map of Furthest Airports from FSI
- List of Furthest Airports from FSI
About this route:
A direct, nonstop flight between Phillips Army Airfield (APG), Aberdeen Proving Ground, Maryland, United States and Henry Post Army Airfield (FSI), Fort Sill, Oklahoma, United States would travel a Great Circle distance of 1,267 miles (or 2,038 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 relatively short distance between Phillips Army Airfield and Henry Post Army Airfield, the route shown on this map most likely still appears to be a straight line.
Departure Airport Information:
IATA / ICAO Codes: | APG / KAPG |
Airport Name: | Phillips Army Airfield |
Location: | Aberdeen Proving Ground, Maryland, United States |
GPS Coordinates: | 39°27'57"N by 76°10'8"W |
Operator/Owner: | United States Army |
Airport Type: | Military |
Elevation: | 57 feet (17 meters) |
# of Runways: | 3 |
View all routes: | Routes from APG |
More Information: | APG Maps & Info |
Arrival 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 |
Facts about Phillips Army Airfield (APG):
- Because of Phillips Army Airfield's relatively low elevation of 57 feet, planes can take off or land at Phillips Army Airfield 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.
- Phillips Army Airfield (APG) has 3 runways.
- The closest airport to Phillips Army Airfield (APG) is Martin State Airport (MTN), which is located only 16 miles (26 kilometers) SW of APG.
- The furthest airport from Phillips Army Airfield (APG) is Margaret River Airport (MGV), which is located 11,706 miles (18,838 kilometers) away in Margaret River, Western Australia, Australia.
Facts about Henry Post Army Airfield (FSI):
- With the end of World War I, in October 1919 Post Field was deactivated as an active duty airfield in accordance with sharply reduced military budgets, and a small caretaker unit was assigned to the facility for administrative reasons to support the balloon school/company.
- As a result of the United State's entry into World War I, Fort Sill was selected for a primary pilot school.
- 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.
- 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.
- In 1940 the Artillery decided that the Air Corps had outgrown such mundane chores as artillery spotting, and it was decided that it would take care of itself with its own observation aircraft.
- 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.
- The Army will continue to operate and maintain a precision approach radar at Fort Sill's Henry Post Field for the foreseeable future.