Nonstop flight route between Sidney, Montana, United States and Denis Island, Seychelles:
Departure Airport:
(47°42'24"N by 104°11'32"W)
Arrival Airport:
(3°48'1"S by 55°39'52"E)
Distance from SDY to DEI:
9,175.39 miles (14,766.31 km)
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Jump to:
- About this route
- SDY Airport Information
- DEI Airport Information
- Facts about SDY
- Facts about DEI
- Map of Nearest Airports to SDY
- List of Nearest Airports to SDY
- Map of Furthest Airports from SDY
- List of Furthest Airports from SDY
- Map of Nearest Airports to DEI
- List of Nearest Airports to DEI
- Map of Furthest Airports from DEI
- List of Furthest Airports from DEI
About this route:
A direct, nonstop flight between Sidney-Richland Municipal Airport (SDY), Sidney, Montana, United States and Denis Island Airport (DEI), Denis Island, Seychelles would travel a Great Circle distance of 9,175 miles (or 14,766 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 Sidney-Richland Municipal Airport and Denis Island 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 Sidney-Richland Municipal Airport and Denis Island Airport. You'll see that it will travel the same route of the red line on this map!
Departure Airport Information:
| IATA / ICAO Codes: | SDY / KSDY |
| Airport Name: | Sidney-Richland Municipal Airport |
| Location: | Sidney, Montana, United States |
| GPS Coordinates: | 47°42'24"N by 104°11'32"W |
| Area Served: | Sidney, Montana |
| Operator/Owner: | Sidney Richland Airport Authority |
| Airport Type: | Public |
| Elevation: | 1985 feet (605 meters) |
| # of Runways: | 2 |
| View all routes: | Routes from SDY |
| More Information: | SDY Maps & Info |
Arrival Airport Information:
| IATA / ICAO Codes: | DEI / FSSD |
| Airport Name: | Denis Island Airport |
| Location: | Denis Island, Seychelles |
| GPS Coordinates: | 3°48'1"S by 55°39'52"E |
| Operator/Owner: | Denis Island |
| Airport Type: | Private |
| Elevation: | 10 feet (3 meters) |
| # of Runways: | 1 |
| View all routes: | Routes from DEI |
| More Information: | DEI Maps & Info |
Facts about Sidney-Richland Municipal Airport (SDY):
- Sidney-Richland Municipal Airport (SDY) has 2 runways.
- The furthest airport from Sidney-Richland Municipal Airport (SDY) is Sir Gaëtan Duval Airport (RRG), which is located 10,383 miles (16,711 kilometers) away in Rodrigues Island, Mauritius.
- The closest airport to Sidney-Richland Municipal Airport (SDY) is Sloulin Field International Airport (ISN), which is located 41 miles (67 kilometers) NE of SDY.
- Sidney-Richland Municipal Airport is a public use airport located one nautical mile west of the central business district of Sidney, a city in Richland County, Montana, United States.
- Sidney-Richland Municipal Airport covers an area of 335 acres at an elevation of 1,985 feet above mean sea level.
- As per the Federal Aviation Administration, this airport had 2,031 passenger boardings in calendar year 2008, 2,766 in 2009, and 3,659 in 2010.
Facts about Denis Island Airport (DEI):
- Denis Island Airport (DEI) currently has only 1 runway.
- The closest airport to Denis Island Airport (DEI) is Bird Island Airport (BDI), which is located 32 miles (51 kilometers) W of DEI.
- Because of Denis Island Airport's relatively low elevation of 10 feet, planes can take off or land at Denis Island 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 Denis Island Airport (DEI) is Atuona Airport (AUQ), which is located 11,058 miles (17,797 kilometers) away in Atuona, Marquesas Islands, French Polynesia.
| Rank | Distance & Direction | Airport Name & IATA Code | Airport Location | Further Actions |
| 1 | 41.33 miles (66.52 km) NE | Sloulin Field International Airport (ISN) | Williston, North Dakota, United States |     |
| 2 | 48.66 miles (78.31 km) SW | Dawson Community Airport (GDV) | Glendive, Montana, United States | |
| 3 | 69.41 miles (111.70 km) WNW | L. M. Clayton Airport (OLF) | Wolf Point, Montana, United States | |
| 4 | 76.29 miles (122.77 km) NNW | Sher-Wood Airport (PWD) | Plentywood, Montana, United States | |
| 5 | 90.57 miles (145.76 km) SE | Dickinson Theodore Roosevelt Regional Airport (DIK) | Dickinson, North Dakota, United States | |
| 6 | 111.04 miles (178.70 km) SSE | Bowman Municipal Airport (BWM) | Bowman, North Dakota, United States | |
| 7 | 117.38 miles (188.91 km) WNW | Glasgow International Airport (GGW) | Glasgow, Montana, United States | |
| 8 | 118.10 miles (190.06 km) NNE | Estevan Regional Aerodrome (YEN) | Estevan, Saskatchewan, Canada | |
| 9 | 118.99 miles (191.50 km) SW | Miles City Airport (MLS) | Miles City, Montana, United States | |
| 10 | 131.42 miles (211.49 km) W | Jordan Airport (JDN) | Jordan, Montana, United States | |
| 11 | 139.74 miles (224.89 km) ENE | Minot Air Force Base (MIB) | Minot, North Dakota, United States | |
| 12 | 140.05 miles (225.38 km) ENE | Minot International Airport (MOT) | Minot, North Dakota, United States | |
| 13 | 174.07 miles (280.14 km) ESE | Bismarck Municipal Airport (BIS) | Bismarck, North Dakota, United States | |
| 14 | 189.51 miles (304.99 km) N | Regina International Airport (YQR) | Regina, Saskatchewan, Canada | |
| 15 | 191.53 miles (308.24 km) NNW | CFB Moose Jaw (YMJ) | Moose Jaw, Saskatchewan, Canada | |
| Rank | Distance & Direction | Airport Name & IATA Code | Airport Location | Further Actions |
| 1 | 10,383.49 miles (16,710.57 km) SSE | Sir Gaëtan Duval Airport (RRG) | Rodrigues Island, Mauritius | |
| 2 | 10,297.57 miles (16,572.29 km) SE | Sir Seewoosagur Ramgoolam International Airport (MRU) | Plaisance, Mauritius | |
| 3 | 10,290.39 miles (16,560.74 km) SE | Pierrefonds Airport (ZSE) | Saint-Pierre, Réunion | |
| 4 | 10,266.41 miles (16,522.14 km) SE | Roland Garros Airport (RUN) | St Denis, Réunion, France | |
| 5 | 10,218.50 miles (16,445.05 km) SE | Tôlanaro Airport (FTU) | Tôlanaro, Madagascar | |
| 6 | 10,203.17 miles (16,420.36 km) W | Margaret River Airport (MGV) | Margaret River, Western Australia, Australia | |
| 7 | 10,179.29 miles (16,381.94 km) W | Busselton Regional Airport (BQB) | Busselton, Western Australia, Australia | |
| 8 | 10,169.42 miles (16,366.06 km) W | Manjimup Airport (MJP) | Manjimup, Western Australia, Australia | |
| 9 | 10,153.64 miles (16,340.65 km) W | Bunbury Airport (BUY) | Bunbury, Western Australia, Australia | |
| 10 | 10,120.11 miles (16,286.69 km) W | Albany Airport (ALH) | Albany, Western Australia, Australia | |
| 11 | 10,113.85 miles (16,276.63 km) ESE | Ampanihy Airport (AMP) | Ampanihy, Madagascar | |
| 12 | 10,100.83 miles (16,255.67 km) WSW | Rottnest Airport (RTS) | Rottnest Island, Western Australia, Australia | |
| 13 | 10,089.33 miles (16,237.15 km) WSW | Jandakot Airport (JAD) | Jandakot, Western Australia, Australia | |
| 14 | 10,078.56 miles (16,219.83 km) WSW | Perth Airport (PER) | Perth, Western Australia, Australia | |
| 15 | 10,076.48 miles (16,216.49 km) W | Katanning Airport (KNI) | Katanning, Western Australia, Australia | |
| Rank | Distance & Direction | Airport Name & IATA Code | Airport Location | Further Actions |
| 1 | 31.89 miles (51.32 km) W | Bird Island Airport (BDI) | Bird Island, Seychelles | |
| 2 | 35.90 miles (57.78 km) S | Praslin Island Airport (PRI) | Praslin Island, Seychelles | |
| 3 | 57.52 miles (92.56 km) SSE | Frégate Island Airport (FRK) | Frégate Island, Seychelles | |
| 4 | 61.18 miles (98.46 km) S | Seychelles International Airport (SEZ) | Mahé, Seychelles | |
| 5 | 190.69 miles (306.89 km) SW | Desroches Island Airport (DES) | Desroches Island, Seychelles | |
| 6 | 733.87 miles (1,181.05 km) SW | Arrachart Airport (DIE) | Antsiranana, Madagascar | |
| 7 | 792.72 miles (1,275.76 km) SW | Ambilobe Airport (AMB) | Ambilobe, Madagascar | |
| 8 | 801.60 miles (1,290.05 km) NW | Obbia Airport (CMO) | Obbia, Somalia | |
| 9 | 820.46 miles (1,320.40 km) WNW | Aden Adde International Airport (MGQ) | Mogadishu, Somalia | |
| 10 | 838.87 miles (1,350.02 km) SW | Ambanja Airport (IVA) | Ambanja, Madagascar | |
| 11 | 854.98 miles (1,375.95 km) SSW | Antsirabato Airport (ANM) | Antalaha, Madagascar | |
| 12 | 921.55 miles (1,483.09 km) SW | Analalava Airport (HVA) | Analalava, Madagascar | |
| 13 | 924.73 miles (1,488.21 km) NW | Abdullahi Yusuf International Airport (GLK) | Galcaio, Somalia | |
| 14 | 942.40 miles (1,516.64 km) WNW | Kismayo Airport (KMU) | Kisimayu, Somalia | |
| 15 | 943.34 miles (1,518.15 km) SW | Dzaoudzi Pamandzi International Airport (DZA) | Dzaoudzi, Mayotte | |
| Rank | Distance & Direction | Airport Name & IATA Code | Airport Location | Further Actions |
| 1 | 11,058.49 miles (17,796.87 km) SE | Atuona Airport (AUQ) | Atuona, Marquesas Islands, French Polynesia | |
| 2 | 10,781.23 miles (17,350.67 km) NW | Los Cabos International Airport (SJD) | Los Cabos, Mexico | |
| 3 | 10,754.90 miles (17,308.29 km) NNW | Manuel Márquez de León International Airport (LAP) | La Paz, Baja California Sur, Mexico | |
| 4 | 10,742.47 miles (17,288.28 km) NNW | Ciudad Constitución Airport (CUA) | Ciudad Constitución, Baja California Sur, Mexico | |
| 5 | 10,732.53 miles (17,272.29 km) NW | Playa de Oro International Airport (ZLO) | Manzanillo, Colima, Mexico | |
| 6 | 10,703.08 miles (17,224.90 km) NW | Lic. Gustavo Díaz Ordaz International Airport (PVR) | Puerto Vallarta, Jalisco, Mexico | |
| 7 | 10,682.85 miles (17,192.33 km) SSE | Pukarua Airport (PUK) | Pukarua, Tuamotus, French Polynesia | |
| 8 | 10,678.75 miles (17,185.74 km) NNW | Loreto International Airport (LTO) | Loreto, Baja California Sur, Mexico | |
| 9 | 10,675.03 miles (17,179.75 km) NW | Licenciado Miguel de la Madrid Airport (CLQ) | Colima, Colima, Mexico | |
| 10 | 10,671.03 miles (17,173.31 km) SE | Fangatau Airport (FGU) | Fangatau, French Polynesia | |
| 11 | 10,649.92 miles (17,139.34 km) NW | Amado Nervo International Airport (TPQ) | Tepic, Nayarit, Mexico | |
| 12 | 10,647.88 miles (17,136.05 km) NW | Lázaro Cárdenas Airport (LZC) | Lázaro Cárdenas, Michoacán, Mexico | |
| 13 | 10,635.05 miles (17,115.42 km) NW | General Rafael Buelna International Airport (MZT) | Mazatlán, Sinaloa, Mexico | |
| 14 | 10,630.62 miles (17,108.28 km) NNW | Guerrero Negro Airport (GUB) | Guerrero Negro, Baja California Sur, Mexico | |
| 15 | 10,618.25 miles (17,088.37 km) WNW | Ixtapa-Zihuatanejo International Airport (ZIH) | Zihuatanejo, Guerrero, Mexico | |