Nonstop flight route between Fort Sill, Oklahoma, United States and Greeley, Colorado, United States:
Departure Airport:

Arrival Airport:

Distance from FSI to GXY:
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- About this route
- FSI Airport Information
- GXY Airport Information
- Facts about FSI
- Facts about GXY
- 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 GXY
- List of Nearest Airports to GXY
- Map of Furthest Airports from GXY
- List of Furthest Airports from GXY
About this route:
A direct, nonstop flight between Henry Post Army Airfield (FSI), Fort Sill, Oklahoma, United States and Greeley-Weld County Airport (GXY), Greeley, Colorado, United States would travel a Great Circle distance of 525 miles (or 846 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 Henry Post Army Airfield and Greeley-Weld County Airport, the route shown on this map most likely still appears to be a straight line.
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: | GXY / KGXY |
Airport Name: | Greeley-Weld County Airport |
Location: | Greeley, Colorado, United States |
GPS Coordinates: | 40°26'15"N by 104°37'59"W |
Area Served: | Greeley, Colorado |
Operator/Owner: | Greeley-Weld County Airport Authority |
Airport Type: | Public |
Elevation: | 4697 feet (1,432 meters) |
# of Runways: | 2 |
View all routes: | Routes from GXY |
More Information: | GXY Maps & Info |
Facts about Henry Post Army Airfield (FSI):
- Henry Post Army Airfield (FSI) currently has only 1 runway.
- By the late 1920s, the World War I tarpaper buildings were rotting and turning into fire hazards.
- Post Field served as a base for flight training for the Air Service.
- 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.
- The first Army aviation at Fort Sill began on 26 July 1915 when eight Curtiss JN-3 airplanes of the 1st Aero Squadron arrived from Rockwell Field, California.
- 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.
- 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 Greeley-Weld County Airport (GXY):
- Because of Greeley-Weld County Airport's high elevation of 4,697 feet, planes must typically fly at a faster airspeed in order to takeoff or land at GXY. Combined with a high temperature, this could make GXY a "Hot & High" airport, where the air density is lower than it would otherwise be at sea level.
- The furthest airport from Greeley-Weld County Airport (GXY) is Sir Gaëtan Duval Airport (RRG), which is located 10,842 miles (17,448 kilometers) away in Rodrigues Island, Mauritius.
- Greeley-Weld County Airport (GXY) has 2 runways.
- The closest airport to Greeley-Weld County Airport (GXY) is Fort Collins-Loveland Municipal Airport (FNL), which is located only 20 miles (32 kilometers) W of GXY.