Nonstop flight route between Fort Sill, Oklahoma, United States and South Indian Lake, Manitoba, Canada:
Departure Airport:

Arrival Airport:

Distance from FSI to XSI:
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- About this route
- FSI Airport Information
- XSI Airport Information
- Facts about FSI
- Facts about XSI
- 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 XSI
- List of Nearest Airports to XSI
- Map of Furthest Airports from XSI
- List of Furthest Airports from XSI
About this route:
A direct, nonstop flight between Henry Post Army Airfield (FSI), Fort Sill, Oklahoma, United States and South Indian Lake Airport (XSI), South Indian Lake, Manitoba, Canada would travel a Great Circle distance of 1,530 miles (or 2,462 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 South Indian Lake 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: | XSI / CZSN |
Airport Name: | South Indian Lake Airport |
Location: | South Indian Lake, Manitoba, Canada |
GPS Coordinates: | 56°47'34"N by 98°54'25"W |
Operator/Owner: | Government of Manitoba |
Airport Type: | Public |
Elevation: | 951 feet (290 meters) |
# of Runways: | 1 |
View all routes: | Routes from XSI |
More Information: | XSI Maps & Info |
Facts about Henry Post Army Airfield (FSI):
- 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.
- 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 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.
- Post Field served as a base for flight training for the Air Service.
- 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.
- By the late 1920s, the World War I tarpaper buildings were rotting and turning into fire hazards.
Facts about South Indian Lake Airport (XSI):
- The furthest airport from South Indian Lake Airport (XSI) is Margaret River Airport (MGV), which is located 10,194 miles (16,405 kilometers) away in Margaret River, Western Australia, Australia.
- Because of South Indian Lake Airport's relatively low elevation of 951 feet, planes can take off or land at South Indian Lake 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.
- The closest airport to South Indian Lake Airport (XSI) is Leaf Rapids Airport (YLR), which is located 45 miles (73 kilometers) WSW of XSI.
- South Indian Lake Airport (XSI) currently has only 1 runway.