Nonstop flight route between Anglesey, Wales, United Kingdom and Sidney, Montana, United States:
Departure Airport:
(53°14'53"N by 4°32'7"W)
Arrival Airport:
(47°42'24"N by 104°11'32"W)
Distance from HLY to SDY:
4,029.70 miles (6,485.15 km)
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- About this route
- HLY Airport Information
- SDY Airport Information
- Facts about HLY
- Facts about SDY
- Map of Nearest Airports to HLY
- List of Nearest Airports to HLY
- Map of Furthest Airports from HLY
- List of Furthest Airports from HLY
- Map of Nearest Airports to SDY
- List of Nearest Airports to SDY
- Map of Furthest Airports from SDY
- List of Furthest Airports from SDY
About this route:
A direct, nonstop flight between Anglesey Airport (HLY), Anglesey, Wales, United Kingdom and Sidney-Richland Municipal Airport (SDY), Sidney, Montana, United States would travel a Great Circle distance of 4,030 miles (or 6,485 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 Anglesey Airport and Sidney-Richland Municipal 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 Anglesey Airport and Sidney-Richland Municipal Airport. You'll see that it will travel the same route of the red line on this map!
Departure Airport Information:
| IATA / ICAO Codes: | HLY / EGOV |
| Airport Names: |
|
| Location: | Anglesey, Wales, United Kingdom |
| GPS Coordinates: | 53°14'53"N by 4°32'7"W |
| Area Served: | Anglesey Gwynedd |
| Operator/Owner: | Operon |
| Airport Type: | Military/Public |
| Elevation: | 37 feet (11 meters) |
| # of Runways: | 3 |
| View all routes: | Routes from HLY |
| More Information: | HLY Maps & Info |
Arrival 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 |
Facts about Anglesey Airport (HLY):
- In addition to being known as "Anglesey Airport", other names for HLY include "Maes Awyr Môn", "RAF Valley" and "VLY".
- Because of Anglesey Airport's relatively low elevation of 37 feet, planes can take off or land at Anglesey 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 Anglesey Airport (HLY) is Ryan's Creek Aerodrome (SZS), which is located 11,891 miles (19,136 kilometers) away in Stewart Island, New Zealand.
- Plans put forward in early 2006 by the National Assembly for Wales have led to a subsidised weekday air service between the airport and Cardiff Airport, 12 miles west of the Welsh capital in the hope of improving the economy of Anglesey and North Wales in general.
- The closest airport to Anglesey Airport (HLY) is Isle of Man Airport (IOM), which is located 58 miles (93 kilometers) N of HLY.
- Anglesey Airport (HLY) has 3 runways.
Facts about Sidney-Richland Municipal Airport (SDY):
- 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.
- 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.
- Scheduled air service temporarily ceased on March 8, 2008, when Big Sky Airlines ended operations in bankruptcy.
- Sidney-Richland Municipal Airport (SDY) has 2 runways.
| Rank | Distance & Direction | Airport Name & IATA Code | Airport Location | Further Actions |
| 1 | 57.82 miles (93.06 km) N | Isle of Man Airport (IOM) | Ronaldsway, Isle of Man, United Kingdom |     |
| 2 | 64.62 miles (104.00 km) E | Chester Hawarden Airport Hawarden Airport (CEG) | Chester, England, United Kingdom | |
| 3 | 69.86 miles (112.43 km) E | Liverpool John Lennon Airport (LPL) | Liverpool, England, United Kingdom | |
| 4 | 71.70 miles (115.39 km) ENE | Blackpool International Airport (BLK) | Blackpool, England, United Kingdom | |
| 5 | 72.56 miles (116.78 km) W | Dublin Airport (DUB) | Dublin, Ireland | |
| 6 | 76.06 miles (122.41 km) ENE | Warton Aerodrome (WRT) | Warton, Lancashire, England, United Kingdom | |
| 7 | 79.95 miles (128.66 km) NE | Barrow/Walney Island Airport (BWF) | Barrow-in-Furness, Cumbria, England, United Kingdom | |
| 8 | 93.61 miles (150.65 km) E | Manchester Airport (MAN) | Manchester, United Kingdom | |
| 9 | 99.39 miles (159.95 km) S | Haverfordwest Aerodrome (HAW) | Haverfordwest, Wales, United Kingdom | |
| 10 | 109.17 miles (175.69 km) NNW | George Best Belfast City Airport (BHD) | Belfast, Northern Ireland, United Kingdom | |
| 11 | 115.20 miles (185.40 km) S | Swansea Airport (SWS) | Swansea, Wales, United Kingdom | |
| 12 | 118.96 miles (191.44 km) NW | Belfast International Airport (BFS) | Belfast, Northern Ireland, United Kingdom | |
| 13 | 122.11 miles (196.51 km) WSW | Kilkenny Airport (KKY) | Kilkenny, Ireland | |
| 14 | 125.46 miles (201.90 km) ENE | Leeds Bradford International Airport (LBA) | Leeds / Bradford, West Yorkshire, England, United Kingdom | |
| 15 | 128.58 miles (206.93 km) ESE | Birmingham Airport (BHX) | Birmingham, England, United Kingdom | |
| Rank | Distance & Direction | Airport Name & IATA Code | Airport Location | Further Actions |
| 1 | 11,890.59 miles (19,136.01 km) SE | Ryan's Creek Aerodrome (SZS) | Stewart Island, New Zealand | |
| 2 | 11,879.10 miles (19,117.51 km) SSE | Dunedin International Airport (DUD) | Dunedin, Otago, New Zealand | |
| 3 | 11,867.61 miles (19,099.02 km) SE | Invercargill Airport (IVC) | Invercargill, New Zealand | |
| 4 | 11,831.75 miles (19,041.31 km) SSE | Oamaru Airport (OAM) | Oamaru, North Otago, New Zealand | |
| 5 | 11,817.78 miles (19,018.82 km) SSE | Alexandra Aerodrome (ALR) | Alexandra, New Zealand | |
| 6 | 11,792.83 miles (18,978.68 km) SSE | Queenstown Airport (ZQN) | Queenstown, New Zealand | |
| 7 | 11,789.59 miles (18,973.46 km) SSE | Richard Pearse Airport (Timaru Airport) (TIU) | Timaru, New Zealand | |
| 8 | 11,784.32 miles (18,964.97 km) SSE | Wanaka Airport (WKA) | Wanaka, New Zealand | |
| 9 | 11,769.95 miles (18,941.85 km) SSE | Ashburton Aerodrome (ASG) | Ashburton, New Zealand | |
| 10 | 11,753.52 miles (18,915.41 km) SSE | Milford Sound Airport (MFN) | Milford Sound, New Zealand | |
| 11 | 11,749.39 miles (18,908.77 km) SSE | Christchurch International Airport (CHC) | Christchurch, New Zealand | |
| 12 | 11,747.29 miles (18,905.39 km) SSE | Glentanner Aerodrome (GTN) | Mount Cook, New Zealand | |
| 13 | 11,738.25 miles (18,890.84 km) SSE | Mount Cook Airport (MON) | Mount Cook, New Zealand | |
| 14 | 11,716.44 miles (18,855.74 km) SSE | Fox Glacier Aerodrome (FGL) | Fox Glacier, New Zealand | |
| 15 | 11,688.31 miles (18,810.46 km) SSW | Chatham Islands (CHT) | Waitangi, Chatham Islands, New Zealand | |
| 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 | |