Nonstop flight route between Fort Sill, Oklahoma, United States and Fort Smith, Northwest Territories, Canada:
Departure Airport:
(34°38'58"N by 98°24'7"W)
Arrival Airport:
(60°1'13"N by 111°57'42"W)
Distance from FSI to YSM:
1,855.98 miles (2,986.91 km)
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- About this route
- FSI Airport Information
- YSM Airport Information
- Facts about FSI
- Facts about YSM
- 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 YSM
- List of Nearest Airports to YSM
- Map of Furthest Airports from YSM
- List of Furthest Airports from YSM
About this route:
A direct, nonstop flight between Henry Post Army Airfield (FSI), Fort Sill, Oklahoma, United States and Fort Smith Airport (YSM), Fort Smith, Northwest Territories, Canada would travel a Great Circle distance of 1,856 miles (or 2,987 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 Fort Smith 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: | YSM / CYSM |
| Airport Name: | Fort Smith Airport |
| Location: | Fort Smith, Northwest Territories, Canada |
| GPS Coordinates: | 60°1'13"N by 111°57'42"W |
| Operator/Owner: | Government of the Northwest Territories |
| Airport Type: | Public |
| Elevation: | 673 feet (205 meters) |
| # of Runways: | 2 |
| View all routes: | Routes from YSM |
| More Information: | YSM Maps & Info |
Facts about Henry Post Army Airfield (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.
- 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.
- 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.
- Air Service/Corps units assigned to Post Field between 1919 and 1941
- As a result of the United State's entry into World War I, Fort Sill was selected for a primary pilot school.
- There are no air units currently stationed at the airfield, however air operations for transient units are provided by permanent party personnel.
Facts about Fort Smith Airport (YSM):
- Fort Smith Airport (YSM) has 2 runways.
- Because of Fort Smith Airport's relatively low elevation of 673 feet, planes can take off or land at Fort Smith 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 furthest airport from Fort Smith Airport (YSM) is Port Alfred Airport (AFD), which is located 9,839 miles (15,834 kilometers) away in Port Alfred, South Africa.
- The closest airport to Fort Smith Airport (YSM) is Fort Chipewyan Airport (YPY), which is located 92 miles (147 kilometers) SSE of YSM.
| Rank | Distance & Direction | Airport Name & IATA Code | Airport Location | Further Actions |
| 1 | 5.72 miles (9.20 km) S | Lawton–Fort Sill Regional Airport (LAW) | Lawton, Oklahoma, United States |     |
| 2 | 28.03 miles (45.12 km) ESE | Halliburton Field (DUC) | Duncan, Oklahoma, United States | |
| 3 | 38.98 miles (62.73 km) WSW | Frederick Regional Airport (FDR) | Frederick, Oklahoma, United States | |
| 4 | 39.53 miles (63.61 km) NE | Chickasha Municipal Airport (CHK) | Chickasha, Oklahoma, United States | |
| 5 | 43.74 miles (70.39 km) WNW | Hobart Regional Airport (HBR) | Hobart, Oklahoma, United States | |
| 6 | 45.95 miles (73.94 km) S | Sheppard Air Force Base (SPS) | Wichita Falls, Texas, United States | |
| 7 | 49.22 miles (79.21 km) W | Altus Air Force Base (LTS) | Altus, Oklahoma, United States | |
| 8 | 53.30 miles (85.78 km) W | Altus/Quartz Mountain Regional Airport (AXS) | Altus, Oklahoma, United States | |
| 9 | 54.76 miles (88.12 km) S | Kickapoo Downtown Airport (KIP) | Wichita Falls, Texas, United States | |
| 10 | 65.69 miles (105.71 km) NW | Clinton-Sherman Industrial Airpark (CSM) | Clinton, Oklahoma, United States | |
| 11 | 66.85 miles (107.58 km) NE | University of Oklahoma Max Westheimer Airport (OUN) | Norman, Oklahoma, United States | |
| 12 | 68.33 miles (109.96 km) NNW | Clinton Regional Airport (CLK) | Clinton, Oklahoma, United States | |
| 13 | 68.51 miles (110.26 km) NE | Will Rogers World Airport (OKC) | Oklahoma City, Oklahoma, United States | |
| 14 | 74.55 miles (119.97 km) NE | Wiley Post Airport (PWA) | Oklahoma City, Oklahoma, United States | |
| 15 | 78.07 miles (125.64 km) NE | Tinker Air Force Base (TIK) | Oklahoma City, Oklahoma, United States | |
| Rank | Distance & Direction | Airport Name & IATA Code | Airport Location | Further Actions |
| 1 | 10,920.33 miles (17,574.52 km) SE | Sir Gaëtan Duval Airport (RRG) | Rodrigues Island, Mauritius | |
| 2 | 10,680.39 miles (17,188.37 km) ESE | Sir Seewoosagur Ramgoolam International Airport (MRU) | Plaisance, Mauritius | |
| 3 | 10,614.31 miles (17,082.03 km) SW | Cocos (Keeling) Island Airport (CCK) | Cocos Islands, Australia | |
| 4 | 10,601.93 miles (17,062.12 km) ESE | Pierrefonds Airport (ZSE) | Saint-Pierre, Réunion | |
| 5 | 10,589.08 miles (17,041.43 km) ESE | Roland Garros Airport (RUN) | St Denis, Réunion, France | |
| 6 | 10,532.55 miles (16,950.46 km) W | Margaret River Airport (MGV) | Margaret River, Western Australia, Australia | |
| 7 | 10,512.35 miles (16,917.95 km) W | Busselton Regional Airport (BQB) | Busselton, Western Australia, Australia | |
| 8 | 10,492.35 miles (16,885.76 km) W | Bunbury Airport (BUY) | Bunbury, Western Australia, Australia | |
| 9 | 10,478.49 miles (16,863.45 km) W | Manjimup Airport (MJP) | Manjimup, Western Australia, Australia | |
| 10 | 10,478.05 miles (16,862.75 km) W | Rottnest Airport (RTS) | Rottnest Island, Western Australia, Australia | |
| 11 | 10,472.77 miles (16,854.25 km) W | Jurien Bay Airport (JUR) | Jurien Bay, Western Australia, Australia | |
| 12 | 10,460.30 miles (16,834.17 km) W | Jandakot Airport (JAD) | Jandakot, Western Australia, Australia | |
| 13 | 10,458.62 miles (16,831.48 km) W | Geraldton Airport (GET) | Geraldton, Western Australia, Australia | |
| 14 | 10,456.31 miles (16,827.76 km) W | Kalbarri Airport (KAX) | Kalbarri, Western Australia, Australia | |
| 15 | 10,452.67 miles (16,821.90 km) W | Perth Airport (PER) | Perth, Western Australia, Australia | |
| Rank | Distance & Direction | Airport Name & IATA Code | Airport Location | Further Actions |
| 1 | 91.51 miles (147.27 km) SSE | Fort Chipewyan Airport (YPY) | Fort Chipewyan, Alberta, Canada | |
| 2 | 99.31 miles (159.82 km) NW | Fort Resolution Airport (YFR) | Fort Resolution, Northwest Territories, Canada | |
| 3 | 125.07 miles (201.28 km) ESE | Uranium City Airport (YBE) | Uranium City, Saskatchewan, Canada | |
| 4 | 141.93 miles (228.41 km) SE | Cluff Lake Airport (XCL) | Cluff Lake, Saskatchewan, Canada | |
| 5 | 142.02 miles (228.56 km) WNW | Hay River/Merlyn Carter Airport (YHY) | Hay River, Northwest Territories, Canada | |
| 6 | 173.30 miles (278.90 km) ESE | Fond-du-Lac Airport (ZFD) | Fond-du-Lac, Saskatchewan, Canada | |
| 7 | 187.78 miles (302.20 km) NNW | Yellowknife Airport (YZF) | Yellowknife, Northwest Territories, Canada | |
| 8 | 206.95 miles (333.06 km) NNE | Fort Reliance Water Aerodrome (YFL) | Fort Reliance, Northwest Territories, Canada | |
| 9 | 207.24 miles (333.51 km) WSW | High Level Airport (YOJ) | High Level, Alberta, Canada | |
| 10 | 220.20 miles (354.38 km) ESE | Stony Rapids Airport (YSF) | Stony Rapids, Saskatchewan, Canada | |
| 11 | 234.17 miles (376.85 km) S | Fort McMurray International Airport (YMM) | Fort McMurray, Alberta, Canada | |
| 12 | 276.25 miles (444.59 km) NW | Whatì Airport (YLE) | Lac La Martre, Northwest Territories, Canada | |
| 13 | 283.22 miles (455.80 km) WSW | Rainbow Lake Airport (YOP) | Rainbow Lake, Alberta, Canada | |
| 14 | 303.83 miles (488.96 km) ESE | Points North Landing Airport (YNL) | Points North Landing, Saskatchewan, Canada | |
| 15 | 303.96 miles (489.18 km) E | Obre Lake/North of Sixty Airport (YDW) | Obre Lake, Northwest Territories, Canada | |
| Rank | Distance & Direction | Airport Name & IATA Code | Airport Location | Further Actions |
| 1 | 9,838.93 miles (15,834.19 km) ESE | Port Alfred Airport (AFD) | Port Alfred, South Africa | |
| 2 | 9,837.63 miles (15,832.09 km) ESE | East London Airport (ELS) | East London, South Africa | |
| 3 | 9,824.19 miles (15,810.46 km) ESE | Port Elizabeth International Airport (PLZ) | Port Elizabeth, South Africa | |
| 4 | 9,817.79 miles (15,800.16 km) SSE | Tôlanaro Airport (FTU) | Tôlanaro, Madagascar | |
| 5 | 9,783.81 miles (15,745.47 km) ESE | Margate Airport (MGH) | Margate, KwaZulu-Natal, South Africa | |
| 6 | 9,775.57 miles (15,732.21 km) ESE | Mthatha Airport (UTT) | Mthatha, South Africa | |
| 7 | 9,753.15 miles (15,696.13 km) SE | Ampanihy Airport (AMP) | Ampanihy, Madagascar | |
| 8 | 9,730.74 miles (15,660.07 km) SE | King Shaka International (DUR) | Durban, KwaZulu-Natal, South Africa | |
| 9 | 9,722.34 miles (15,646.54 km) ESE | George Airport (GRJ) | George, South Africa | |
| 10 | 9,712.18 miles (15,630.20 km) ESE | Pietermaritzburg Airport (PZB) | Pietermaritzburg, South Africa | |
| 11 | 9,705.04 miles (15,618.71 km) SE | Richards Bay Airport (RCB) | Richards Bay, KwaZulu-Natal, South Africa | |
| 12 | 9,692.64 miles (15,598.75 km) SSE | Pierrefonds Airport (ZSE) | Saint-Pierre, Réunion | |
| 13 | 9,676.00 miles (15,571.97 km) ESE | Lebakeng Airport (LEF) | Lebakeng, Lesotho | |
| 14 | 9,672.35 miles (15,566.11 km) WSW | Margaret River Airport (MGV) | Margaret River, Western Australia, Australia | |
| 15 | 9,665.11 miles (15,554.44 km) SE | Hluhluwe Airport (HLW) | Hluhluwe, South Africa | |