Nonstop flight route between Greensboro, North Carolina, United States and St. Mary's, Alaska, United States:
Departure Airport:
(36°5'52"N by 79°56'13"W)
Arrival Airport:
(62°3'38"N by 163°18'6"W)
Distance from GSO to KSM:
3,845.08 miles (6,188.04 km)
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Jump to:
- About this route
- GSO Airport Information
- KSM Airport Information
- Facts about GSO
- Facts about KSM
- Map of Nearest Airports to GSO
- List of Nearest Airports to GSO
- Map of Furthest Airports from GSO
- List of Furthest Airports from GSO
- Map of Nearest Airports to KSM
- List of Nearest Airports to KSM
- Map of Furthest Airports from KSM
- List of Furthest Airports from KSM
About this route:
A direct, nonstop flight between Piedmont Triad International Airport (GSO), Greensboro, North Carolina, United States and St. Mary's Airport (KSM), St. Mary's, Alaska, United States would travel a Great Circle distance of 3,845 miles (or 6,188 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 Piedmont Triad International Airport and St. Mary's 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 Piedmont Triad International Airport and St. Mary's Airport. You'll see that it will travel the same route of the red line on this map!
Departure Airport Information:
| IATA / ICAO Codes: | GSO / KGSO |
| Airport Name: | Piedmont Triad International Airport |
| Location: | Greensboro, North Carolina, United States |
| GPS Coordinates: | 36°5'52"N by 79°56'13"W |
| Area Served: | Greensboro, High Point, and Winston-Salem, North Carolina |
| Operator/Owner: | Piedmont Triad Airport Authority |
| Airport Type: | Public |
| Elevation: | 926 feet (282 meters) |
| # of Runways: | 3 |
| View all routes: | Routes from GSO |
| More Information: | GSO Maps & Info |
Arrival Airport Information:
| IATA / ICAO Codes: | KSM / PASM |
| Airport Name: | St. Mary's Airport |
| Location: | St. Mary's, Alaska, United States |
| GPS Coordinates: | 62°3'38"N by 163°18'6"W |
| Operator/Owner: | Alaska DOT&PF |
| Airport Type: | Public |
| Elevation: | 312 feet (95 meters) |
| # of Runways: | 2 |
| View all routes: | Routes from KSM |
| More Information: | KSM Maps & Info |
Facts about Piedmont Triad International Airport (GSO):
- Because of Piedmont Triad International Airport's relatively low elevation of 926 feet, planes can take off or land at Piedmont Triad International 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.
- Piedmont Triad International Airport (GSO) has 3 runways.
- Skybus Airlines began service to Port Columbus International Airport as well in May 2007.
- The furthest airport from Piedmont Triad International Airport (GSO) is Margaret River Airport (MGV), which is located 11,574 miles (18,626 kilometers) away in Margaret River, Western Australia, Australia.
- The closest airport to Piedmont Triad International Airport (GSO) is Smith Reynolds Airport (INT), which is located only 16 miles (26 kilometers) W of GSO.
- Pitcairn Aviation, Incorporated was given the contract to fly the airmail route, the second official airmail route in the United States, and Pitcairn Aviation made the first delivery of airmail in North Carolina on May 1, 1928.
- By 1975 airport officials began to plan for a new terminal.
Facts about St. Mary's Airport (KSM):
- St. Mary's Airport (KSM) has 2 runways.
- The furthest airport from St. Mary's Airport (KSM) is Cape Town International Airport (CPT), which is located 10,494 miles (16,889 kilometers) away in Cape Town, South Africa.
- The closest airport to St. Mary's Airport (KSM) is Mountain Village Airport (MOU), which is located only 13 miles (20 kilometers) W of KSM.
- Because of St. Mary's Airport's relatively low elevation of 312 feet, planes can take off or land at St. Mary's 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.
| Rank | Distance & Direction | Airport Name & IATA Code | Airport Location | Further Actions |
| 1 | 16.08 miles (25.88 km) W | Smith Reynolds Airport (INT) | Winston-Salem, North Carolina, United States |     |
| 2 | 45.17 miles (72.70 km) SW | Rowan County Airport (SRW) | Salisbury, North Carolina, United States | |
| 3 | 46.87 miles (75.42 km) NE | Danville Regional Airport (DAN) | Danville, Virginia, United States | |
| 4 | 65.34 miles (105.16 km) W | Wilkes County Airport (IKB) | North Wilkesboro, North Carolina, United States | |
| 5 | 65.43 miles (105.29 km) SW | Concord Regional Airport (USA) | Concord, North Carolina, United States | |
| 6 | 66.05 miles (106.30 km) ESE | Raleigh–Durham International Airport (RDU) | Raleigh / Durham, North Carolina, United States | |
| 7 | 66.90 miles (107.66 km) SSE | Moore County Airport (SOP) | Pinehurst / Southern Pines, North Carolina, United States | |
| 8 | 73.63 miles (118.50 km) SW | Wilgrove Air Park (QWG) | Charlotte, North Carolina, United States | |
| 9 | 77.39 miles (124.54 km) SSE | Mackall Army Airfield (HFF) | Camp Mackall, North Carolina, United States | |
| 10 | 81.01 miles (130.37 km) NNW | Virginia Tech Montgomery Executive Airport (BCB) | Blacksburg, Virginia, United States | |
| 11 | 82.38 miles (132.58 km) SE | Pope Field (POB) | Fayetteville, North Carolina, United States | |
| 12 | 82.75 miles (133.18 km) NNW | New River Valley Airport (PSK) | Dublin, Virginia, United States | |
| 13 | 83.18 miles (133.86 km) SW | Charlotte Douglas International Airport (CLT) | Charlotte, North Carolina, United States | |
| 14 | 84.86 miles (136.57 km) N | Roanoke–Blacksburg Regional Airport (ROA) | Roanoke, Virginia, United States | |
| 15 | 84.91 miles (136.65 km) WSW | Hickory Regional Airport (HKY) | Hickory, North Carolina, United States | |
| Rank | Distance & Direction | Airport Name & IATA Code | Airport Location | Further Actions |
| 1 | 11,573.70 miles (18,626.03 km) W | Margaret River Airport (MGV) | Margaret River, Western Australia, Australia | |
| 2 | 11,552.77 miles (18,592.33 km) W | Busselton Regional Airport (BQB) | Busselton, Western Australia, Australia | |
| 3 | 11,531.63 miles (18,558.31 km) W | Bunbury Airport (BUY) | Bunbury, Western Australia, Australia | |
| 4 | 11,521.16 miles (18,541.47 km) W | Manjimup Airport (MJP) | Manjimup, Western Australia, Australia | |
| 5 | 11,508.04 miles (18,520.36 km) WSW | Rottnest Airport (RTS) | Rottnest Island, Western Australia, Australia | |
| 6 | 11,491.78 miles (18,494.17 km) WSW | Jandakot Airport (JAD) | Jandakot, Western Australia, Australia | |
| 7 | 11,483.48 miles (18,480.82 km) WSW | Jurien Bay Airport (JUR) | Jurien Bay, Western Australia, Australia | |
| 8 | 11,483.10 miles (18,480.21 km) WSW | Perth Airport (PER) | Perth, Western Australia, Australia | |
| 9 | 11,446.69 miles (18,421.62 km) WSW | Geraldton Airport (GET) | Geraldton, Western Australia, Australia | |
| 10 | 11,437.05 miles (18,406.10 km) W | Albany Airport (ALH) | Albany, Western Australia, Australia | |
| 11 | 11,427.65 miles (18,390.98 km) W | Katanning Airport (KNI) | Katanning, Western Australia, Australia | |
| 12 | 11,423.26 miles (18,383.91 km) WSW | Kalbarri Airport (KAX) | Kalbarri, Western Australia, Australia | |
| 13 | 11,395.13 miles (18,338.63 km) WSW | Morawa Airport (MWB) | Morawa, Western Australia, Australia | |
| 14 | 11,393.55 miles (18,336.10 km) WSW | Mullewa Airport (MXU) | Mullewa, Western Australia, Australia | |
| 15 | 11,372.18 miles (18,301.71 km) SW | Shark Bay Airport (MJK) | Monkey Mia, Western Australia, Australia | |
| Rank | Distance & Direction | Airport Name & IATA Code | Airport Location | Further Actions |
| 1 | 12.52 miles (20.15 km) W | Mountain Village Airport (MOU) | Mountain Village, Alaska, United States | |
| 2 | 15.71 miles (25.28 km) ESE | Pilot Station Airport (PQS) | Pilot Station, Alaska, United States | |
| 3 | 43.61 miles (70.18 km) ESE | Marshall Don Hunter Sr. Airport (MLL) | Marshall, Alaska, United States | |
| 4 | 58.95 miles (94.87 km) WNW | Sheldon Point Airport (SXP) | Sheldon Point, Alaska, United States | |
| 5 | 61.02 miles (98.20 km) NW | Alakanuk Airport (AUK) | Alakanuk, Alaska, United States | |
| 6 | 62.90 miles (101.24 km) NW | Emmonak Airport (EMK) | Emmonak, Alaska, United States | |
| 7 | 67.40 miles (108.48 km) N | Kotlik Airport (KOT) | Kotlik, Alaska, United States | |
| 8 | 67.43 miles (108.52 km) ESE | Russian Mission Airport (RSH) | Russian Mission, Alaska, United States | |
| 9 | 75.21 miles (121.04 km) W | Scammon Bay Airport (SCM) | Scammon Bay, Alaska, United States | |
| 10 | 83.21 miles (133.91 km) WSW | Chevak Airport (VAK) | Chevak, Alaska, United States | |
| 11 | 84.72 miles (136.35 km) SSE | Nunapitchuk Airport (NUP) | Nunapitchuk, Alaska, United States | |
| 12 | 85.97 miles (138.35 km) SSE | Kasigluk Airport (KUK) | Kasigluk, Alaska, United States | |
| 13 | 88.49 miles (142.42 km) W | Cape Romanzof Air Force Station Cape Romanzof Long Range Radar Site (CZF) | Cape Romanzof, Alaska, United States | |
| 14 | 89.19 miles (143.53 km) SSW | Newtok Airport (WWT) | Newtok, Alaska, United States | |
| 15 | 89.22 miles (143.59 km) SSE | Atmautluak Airport (ATT) | Atmautluak, Alaska, United States | |
| Rank | Distance & Direction | Airport Name & IATA Code | Airport Location | Further Actions |
| 1 | 10,494.08 miles (16,888.54 km) S | Cape Town International Airport (CPT) | Cape Town, South Africa | |
| 2 | 10,482.44 miles (16,869.80 km) S | George Airport (GRJ) | George, South Africa | |
| 3 | 10,457.83 miles (16,830.21 km) SSW | Port Elizabeth International Airport (PLZ) | Port Elizabeth, South Africa | |
| 4 | 10,416.76 miles (16,764.12 km) SSW | Port Alfred Airport (AFD) | Port Alfred, South Africa | |
| 5 | 10,371.90 miles (16,691.92 km) SSW | East London Airport (ELS) | East London, South Africa | |
| 6 | 10,261.64 miles (16,514.46 km) SSW | Mthatha Airport (UTT) | Mthatha, South Africa | |
| 7 | 10,199.66 miles (16,414.71 km) S | Kleinsee Airport (KLZ) | Kleinzee, South Africa | |
| 8 | 10,195.75 miles (16,408.43 km) SSW | Margate Airport (MGH) | Margate, KwaZulu-Natal, South Africa | |
| 9 | 10,169.94 miles (16,366.89 km) S | Aggeneys Airport (AGZ) | Aggeneys, South Africa | |
| 10 | 10,169.94 miles (16,366.89 km) S | Wild Coast Sun Airport (MZF) | Mzamba, South Africa | |
| 11 | 10,157.43 miles (16,346.75 km) SSW | Mafeteng Airport (MFC) | Mafeteng, Lesotho | |
| 12 | 10,151.99 miles (16,338.00 km) SSW | Semonkong Airport (SOK) | Semonkong, Lesotho | |
| 13 | 10,149.37 miles (16,333.79 km) SSW | Lebakeng Airport (LEF) | Lebakeng, Lesotho | |
| 14 | 10,143.31 miles (16,324.03 km) SSW | Lesobeng Airport (LES) | Lesobeng, Lesotho | |
| 15 | 10,133.50 miles (16,308.25 km) SE | Teniente Rodolfo Marsh Airport (TNM) | Villa Las Estrellas, Antarctica | |