Nonstop flight route between Thorne Bay, Alaska, United States and Ludington, Michigan, United States:
Departure Airport:
(55°41'17"N by 132°32'12"W)
Arrival Airport:
(43°57'44"N by 86°24'28"W)
Distance from KTB to LDM:
2,161.67 miles (3,478.86 km)
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- About this route
- KTB Airport Information
- LDM Airport Information
- Facts about KTB
- Facts about LDM
- Map of Nearest Airports to KTB
- List of Nearest Airports to KTB
- Map of Furthest Airports from KTB
- List of Furthest Airports from KTB
- Map of Nearest Airports to LDM
- List of Nearest Airports to LDM
- Map of Furthest Airports from LDM
- List of Furthest Airports from LDM
About this route:
A direct, nonstop flight between Thorne Bay Seaplane Base (KTB), Thorne Bay, Alaska, United States and Mason County Airport (LDM), Ludington, Michigan, United States would travel a Great Circle distance of 2,162 miles (or 3,479 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 Thorne Bay Seaplane Base and Mason County Airport, the route shown on this map most likely still appears to be a straight line.
Departure Airport Information:
| IATA / ICAO Codes: | KTB / |
| Airport Name: | Thorne Bay Seaplane Base |
| Location: | Thorne Bay, Alaska, United States |
| GPS Coordinates: | 55°41'17"N by 132°32'12"W |
| Area Served: | Thorne Bay, Alaska |
| Operator/Owner: | State of Alaska DOT&PF - Southeast Region |
| Airport Type: | Public |
| Elevation: | 0 feet (0 meters) |
| # of Runways: | 1 |
| View all routes: | Routes from KTB |
| More Information: | KTB Maps & Info |
Arrival Airport Information:
| IATA / ICAO Codes: | LDM / KLDM |
| Airport Name: | Mason County Airport |
| Location: | Ludington, Michigan, United States |
| GPS Coordinates: | 43°57'44"N by 86°24'28"W |
| Area Served: | Ludington |
| Operator/Owner: | Mason County |
| Airport Type: | Public |
| Elevation: | 646 feet (197 meters) |
| # of Runways: | 2 |
| View all routes: | Routes from LDM |
| More Information: | LDM Maps & Info |
Facts about Thorne Bay Seaplane Base (KTB):
- The furthest airport from Thorne Bay Seaplane Base (KTB) is Port Alfred Airport (AFD), which is located 10,618 miles (17,088 kilometers) away in Port Alfred, South Africa.
- Because of Thorne Bay Seaplane Base's relatively low elevation of 0 feet, planes can take off or land at Thorne Bay Seaplane Base 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.
- Thorne Bay Seaplane Base (KTB) currently has only 1 runway.
- The closest airport to Thorne Bay Seaplane Base (KTB) is Hollis Clark Bay Seaplane Base (HYL), which is located only 14 miles (23 kilometers) SSW of KTB.
Facts about Mason County Airport (LDM):
- The closest airport to Mason County Airport (LDM) is Manistee County Blacker Airport (MBL), which is located 23 miles (37 kilometers) NNE of LDM.
- The furthest airport from Mason County Airport (LDM) is Margaret River Airport (MGV), which is located 11,095 miles (17,856 kilometers) away in Margaret River, Western Australia, Australia.
- Because of Mason County Airport's relatively low elevation of 646 feet, planes can take off or land at Mason County 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.
- Mason County Airport (LDM) has 2 runways.
| Rank | Distance & Direction | Airport Name & IATA Code | Airport Location | Further Actions |
| 1 | 14.06 miles (22.63 km) SSW | Hollis Clark Bay Seaplane Base (HYL) | Hollis, Alaska, United States |     |
| 2 | 22.34 miles (35.96 km) WSW | Klawock Airport (KLW) | Klawock, Alaska, United States | |
| 3 | 25.34 miles (40.79 km) NNW | Coffman Cove Seaplane Base (KCC) | Coffman Cove, Alaska, United States | |
| 4 | 27.90 miles (44.90 km) WSW | Craig Seaplane Base (CGA) | Craig, Alaska, United States | |
| 5 | 29.09 miles (46.82 km) WNW | Naukati Bay Seaplane Base (WNC) | Tuxekan Island, Alaska, United States | |
| 6 | 35.17 miles (56.60 km) WNW | Tokeen Seaplane Base (TKI) | Tokeen, Alaska, United States | |
| 7 | 35.19 miles (56.63 km) SSW | Hydaburg Seaplane Base (HYG) | Hydaburg, Alaska, United States | |
| 8 | 37.27 miles (59.99 km) NW | North Whale Seaplane Base (WWP) | North Whale Pass, Alaska, United States | |
| 9 | 38.70 miles (62.28 km) SW | Waterfall Seaplane Base (KWF) | Waterfall, Alaska, United States | |
| 10 | 39.68 miles (63.87 km) SE | Ketchikan International Airport (KTN) | Ketchikan, Alaska, United States | |
| 11 | 41.60 miles (66.95 km) SE | Ketchikan Harbor Seaplane Base (WFB) | Ketchikan, Alaska, United States | |
| 12 | 53.80 miles (86.58 km) SE | Metlakatla Seaplane Base (MTM) | Metlakatla, Annette Island, Alaska, United States | |
| 13 | 55.40 miles (89.16 km) N | Wrangell Airport (WRG) | Wrangell, Alaska, United States | |
| 14 | 58.51 miles (94.17 km) SE | Annette Island Airport (ANN) | Annette Island, Alaska, United States | |
| 15 | 60.66 miles (97.62 km) NW | Port Protection Seaplane Base (PPV) | Port Protection, Alaska, United States | |
| Rank | Distance & Direction | Airport Name & IATA Code | Airport Location | Further Actions |
| 1 | 10,618.12 miles (17,088.17 km) SE | Port Alfred Airport (AFD) | Port Alfred, South Africa | |
| 2 | 10,611.06 miles (17,076.80 km) SE | Port Elizabeth International Airport (PLZ) | Port Elizabeth, South Africa | |
| 3 | 10,609.57 miles (17,074.40 km) SE | East London Airport (ELS) | East London, South Africa | |
| 4 | 10,536.12 miles (16,956.21 km) SE | Mthatha Airport (UTT) | Mthatha, South Africa | |
| 5 | 10,529.16 miles (16,945.00 km) SSE | Margate Airport (MGH) | Margate, KwaZulu-Natal, South Africa | |
| 6 | 10,521.15 miles (16,932.11 km) SE | George Airport (GRJ) | George, South Africa | |
| 7 | 10,464.33 miles (16,840.66 km) SSE | King Shaka International (DUR) | Durban, KwaZulu-Natal, South Africa | |
| 8 | 10,451.86 miles (16,820.59 km) SSE | Pietermaritzburg Airport (PZB) | Pietermaritzburg, South Africa | |
| 9 | 10,430.04 miles (16,785.47 km) SE | Lebakeng Airport (LEF) | Lebakeng, Lesotho | |
| 10 | 10,425.95 miles (16,778.90 km) SSE | Richards Bay Airport (RCB) | Richards Bay, KwaZulu-Natal, South Africa | |
| 11 | 10,414.65 miles (16,760.71 km) SE | Lesobeng Airport (LES) | Lesobeng, Lesotho | |
| 12 | 10,413.17 miles (16,758.33 km) SE | Semonkong Airport (SOK) | Semonkong, Lesotho | |
| 13 | 10,403.14 miles (16,742.18 km) SE | Cape Town International Airport (CPT) | Cape Town, South Africa | |
| 14 | 10,400.12 miles (16,737.33 km) SE | Mokhotlong Airport (MKH) | Mokhotlong, Lesotho | |
| 15 | 10,391.75 miles (16,723.87 km) SE | Mafeteng Airport (MFC) | Mafeteng, Lesotho | |
| Rank | Distance & Direction | Airport Name & IATA Code | Airport Location | Further Actions |
| 1 | 22.86 miles (36.78 km) NNE | Manistee County Blacker Airport (MBL) | Manistee, Michigan, United States | |
| 2 | 44.55 miles (71.70 km) E | Nartron Field (RCT) | Reed City, Michigan, United States | |
| 3 | 47.99 miles (77.23 km) ESE | Roben-Hood Airport (WBR) | Big Rapids, Michigan, United States | |
| 4 | 53.60 miles (86.26 km) ENE | Wexford County Airport (CAD) | Cadillac, Michigan, United States | |
| 5 | 55.58 miles (89.45 km) S | Muskegon County Airport (MKG) | Muskegon, Michigan, United States | |
| 6 | 64.25 miles (103.39 km) W | Manitowoc County Airport (MTW) | Manitowoc, Wisconsin, United States | |
| 7 | 67.54 miles (108.70 km) NE | Cherry Capital Airport (TVC) | Traverse City, Michigan, United States | |
| 8 | 73.15 miles (117.72 km) W | Sheboygan County Memorial Airport (SBM) | Sheboygan, Wisconsin, United States | |
| 9 | 78.81 miles (126.83 km) NW | Door County Cherryland Airport (SUE) | Sturgeon Bay, Wisconsin, United States | |
| 10 | 81.55 miles (131.24 km) S | Park Township Airport (HLM) | Holland, Michigan, United States | |
| 11 | 86.57 miles (139.32 km) ESE | Mount Pleasant Municipal Airport (MOP) | Mount Pleasant, Michigan, United States | |
| 12 | 86.94 miles (139.91 km) SSE | Gerald R. Ford International Airport (GRR) | Grand Rapids, Michigan, United States | |
| 13 | 90.35 miles (145.40 km) ENE | Roscommon County - Blodgett Memorial Airport (HTL) | Houghton Lake, Michigan, United States | |
| 14 | 92.58 miles (148.99 km) WNW | Austin Straubel International Airport (GRB) | Green Bay, Wisconsin, United States | |
| 15 | 92.64 miles (149.08 km) NE | Antrim County Airport (ACB) | Bellaire, Michigan, United States | |
| Rank | Distance & Direction | Airport Name & IATA Code | Airport Location | Further Actions |
| 1 | 11,095.20 miles (17,855.95 km) WSW | Margaret River Airport (MGV) | Margaret River, Western Australia, Australia | |
| 2 | 11,071.31 miles (17,817.49 km) WSW | Busselton Regional Airport (BQB) | Busselton, Western Australia, Australia | |
| 3 | 11,061.27 miles (17,801.34 km) WSW | Manjimup Airport (MJP) | Manjimup, Western Australia, Australia | |
| 4 | 11,045.60 miles (17,776.13 km) WSW | Bunbury Airport (BUY) | Bunbury, Western Australia, Australia | |
| 5 | 11,009.59 miles (17,718.18 km) WSW | Albany Airport (ALH) | Albany, Western Australia, Australia | |
| 6 | 10,991.27 miles (17,688.70 km) WSW | Rottnest Airport (RTS) | Rottnest Island, Western Australia, Australia | |
| 7 | 10,980.26 miles (17,670.98 km) WSW | Jandakot Airport (JAD) | Jandakot, Western Australia, Australia | |
| 8 | 10,969.36 miles (17,653.44 km) WSW | Perth Airport (PER) | Perth, Western Australia, Australia | |
| 9 | 10,968.05 miles (17,651.32 km) WSW | Katanning Airport (KNI) | Katanning, Western Australia, Australia | |
| 10 | 10,932.03 miles (17,593.36 km) WSW | Jurien Bay Airport (JUR) | Jurien Bay, Western Australia, Australia | |
| 11 | 10,871.25 miles (17,495.54 km) SW | Geraldton Airport (GET) | Geraldton, Western Australia, Australia | |
| 12 | 10,837.13 miles (17,440.63 km) WSW | Morawa Airport (MWB) | Morawa, Western Australia, Australia | |
| 13 | 10,831.77 miles (17,432.00 km) SW | Kalbarri Airport (KAX) | Kalbarri, Western Australia, Australia | |
| 14 | 10,821.65 miles (17,415.71 km) SW | Mullewa Airport (MXU) | Mullewa, Western Australia, Australia | |
| 15 | 10,770.44 miles (17,333.31 km) WSW | Esperance Airport (EPR) | Esperance, Australia | |