Nonstop flight route between Decatur, Alabama, United States and Alton, Illinois, United States:
Departure Airport:
(34°39'15"N by 86°56'43"W)
Arrival Airport:
(38°53'25"N by 90°2'45"W)
Distance from DCU to ALN:
339.23 miles (545.94 km)
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Jump to:
- About this route
- DCU Airport Information
- ALN Airport Information
- Facts about DCU
- Facts about ALN
- Map of Nearest Airports to DCU
- List of Nearest Airports to DCU
- Map of Furthest Airports from DCU
- List of Furthest Airports from DCU
- Map of Nearest Airports to ALN
- List of Nearest Airports to ALN
- Map of Furthest Airports from ALN
- List of Furthest Airports from ALN
About this route:
A direct, nonstop flight between Pryor Field Regional Airport (DCU), Decatur, Alabama, United States and St. Louis Regional Airport (ALN), Alton, Illinois, United States would travel a Great Circle distance of 339 miles (or 546 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 Pryor Field Regional Airport and St. Louis Regional Airport, the route shown on this map most likely still appears to be a straight line.
Departure Airport Information:
| IATA / ICAO Codes: | DCU / KDCU |
| Airport Name: | Pryor Field Regional Airport |
| Location: | Decatur, Alabama, United States |
| GPS Coordinates: | 34°39'15"N by 86°56'43"W |
| Area Served: | Decatur, Alabama |
| Operator/Owner: | Decatur/Athens Airport Authority |
| Airport Type: | Public |
| Elevation: | 592 feet (180 meters) |
| # of Runways: | 1 |
| View all routes: | Routes from DCU |
| More Information: | DCU Maps & Info |
Arrival Airport Information:
| IATA / ICAO Codes: | ALN / KALN |
| Airport Name: | St. Louis Regional Airport |
| Location: | Alton, Illinois, United States |
| GPS Coordinates: | 38°53'25"N by 90°2'45"W |
| Area Served: | Alton, Illinois |
| Operator/Owner: | St. Louis Regional |
| Airport Type: | Public |
| Elevation: | 544 feet (166 meters) |
| # of Runways: | 2 |
| View all routes: | Routes from ALN |
| More Information: | ALN Maps & Info |
Facts about Pryor Field Regional Airport (DCU):
- The furthest airport from Pryor Field Regional Airport (DCU) is Margaret River Airport (MGV), which is located 11,180 miles (17,992 kilometers) away in Margaret River, Western Australia, Australia.
- Pryor Field Regional Airport (DCU) currently has only 1 runway.
- Flying training was performed with Fairchild PT-19s as the primary trainer.
- Because of Pryor Field Regional Airport's relatively low elevation of 592 feet, planes can take off or land at Pryor Field Regional 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 closest airport to Pryor Field Regional Airport (DCU) is Huntsville International Airport (HSV), which is located only 10 miles (16 kilometers) E of DCU.
Facts about St. Louis Regional Airport (ALN):
- The furthest airport from St. Louis Regional Airport (ALN) is Margaret River Airport (MGV), which is located 11,002 miles (17,706 kilometers) away in Margaret River, Western Australia, Australia.
- The closest airport to St. Louis Regional Airport (ALN) is Lambert–St. Louis International Airport (STL), which is located only 20 miles (32 kilometers) WSW of ALN.
- Because of St. Louis Regional Airport's relatively low elevation of 544 feet, planes can take off or land at St. Louis Regional 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.
- In the spring of 2004 the airport was at the center of a scandal.
- St. Louis Regional Airport (ALN) has 2 runways.
| Rank | Distance & Direction | Airport Name & IATA Code | Airport Location | Further Actions |
| 1 | 9.75 miles (15.69 km) E | Huntsville International Airport (HSV) | Huntsville / Decatur, Alabama, United States |     |
| 2 | 14.90 miles (23.98 km) E | Redstone Army Airfield (AAF) (HUA) | Redstone Arsenal (near Huntsville), Alabama, United States | |
| 3 | 35.39 miles (56.96 km) NE | Fayetteville Municipal Airport (FYM) | Fayetteville, Tennessee, United States | |
| 4 | 38.30 miles (61.63 km) W | Northwest Alabama Regional Airport (MSL) | Muscle Shoals, Alabama, United States | |
| 5 | 63.59 miles (102.34 km) NNW | Maury County Airport (MRC) | Columbia/Mount Pleasant, Tennessee, United States | |
| 6 | 63.86 miles (102.77 km) NE | Tullahoma Regional Airport (THA) | Tullahoma, Tennessee, United States | |
| 7 | 67.85 miles (109.19 km) SE | Northeast Alabama Regional Airport (GAD) | Gadsden, Alabama, United States | |
| 8 | 68.70 miles (110.56 km) NNE | Shelbyville Municipal Airport (SYI) | Shelbyville, Tennessee, United States | |
| 9 | 70.49 miles (113.44 km) ENE | Franklin County Airport (UOS) | Sewanee, Tennessee, United States | |
| 10 | 70.57 miles (113.57 km) WSW | Marion County - Rankin Fite Airport (HAB) | Hamilton, Alabama, United States | |
| 11 | 76.14 miles (122.53 km) S | Birmingham-Shuttlesworth International Airport (BHM) | Birmingham, Alabama, United States | |
| 12 | 82.06 miles (132.06 km) ENE | Marion County Airport (APT) | Jasper, Tennessee, United States | |
| 13 | 85.51 miles (137.62 km) SSE | St. Clair County Airport (PLR) | Pell City, Alabama, United States | |
| 14 | 86.47 miles (139.16 km) NNW | Centerville Municipal Airport (GHM) | Centerville, Tennessee, United States | |
| 15 | 90.74 miles (146.03 km) SE | Talladega Municipal Airport (ASN) | Talladega, Alabama, United States | |
| Rank | Distance & Direction | Airport Name & IATA Code | Airport Location | Further Actions |
| 1 | 11,179.89 miles (17,992.25 km) W | Margaret River Airport (MGV) | Margaret River, Western Australia, Australia | |
| 2 | 11,160.27 miles (17,960.66 km) W | Busselton Regional Airport (BQB) | Busselton, Western Australia, Australia | |
| 3 | 11,140.94 miles (17,929.56 km) W | Bunbury Airport (BUY) | Bunbury, Western Australia, Australia | |
| 4 | 11,128.73 miles (17,909.90 km) W | Rottnest Airport (RTS) | Rottnest Island, Western Australia, Australia | |
| 5 | 11,124.24 miles (17,902.69 km) W | Manjimup Airport (MJP) | Manjimup, Western Australia, Australia | |
| 6 | 11,122.62 miles (17,900.07 km) W | Jurien Bay Airport (JUR) | Jurien Bay, Western Australia, Australia | |
| 7 | 11,110.85 miles (17,881.13 km) W | Jandakot Airport (JAD) | Jandakot, Western Australia, Australia | |
| 8 | 11,104.61 miles (17,871.09 km) WSW | Geraldton Airport (GET) | Geraldton, Western Australia, Australia | |
| 9 | 11,103.33 miles (17,869.03 km) W | Perth Airport (PER) | Perth, Western Australia, Australia | |
| 10 | 11,097.40 miles (17,859.49 km) WSW | Kalbarri Airport (KAX) | Kalbarri, Western Australia, Australia | |
| 11 | 11,074.48 miles (17,822.60 km) WSW | Shark Bay Airport (MJK) | Monkey Mia, Western Australia, Australia | |
| 12 | 11,050.67 miles (17,784.29 km) WSW | Mullewa Airport (MXU) | Mullewa, Western Australia, Australia | |
| 13 | 11,041.81 miles (17,770.02 km) W | Morawa Airport (MWB) | Morawa, Western Australia, Australia | |
| 14 | 11,035.79 miles (17,760.33 km) W | Albany Airport (ALH) | Albany, Western Australia, Australia | |
| 15 | 11,032.55 miles (17,755.12 km) W | Katanning Airport (KNI) | Katanning, Western Australia, Australia | |
| Rank | Distance & Direction | Airport Name & IATA Code | Airport Location | Further Actions |
| 1 | 19.64 miles (31.61 km) WSW | Lambert–St. Louis International Airport (STL) | St. Louis, Missouri, United States | |
| 2 | 22.85 miles (36.78 km) SSW | St. Louis Downtown Airport (CPS) | Cahokia, Illinois (near St. Louis), United States | |
| 3 | 26.41 miles (42.50 km) SSE | MidAmerica St. Louis Airport (BLV) | Belleville, Illinois, United States | |
| 4 | 36.08 miles (58.06 km) E | Greenville Airport (GRE) | Greenville, Illinois, United States | |
| 5 | 36.24 miles (58.32 km) WSW | Spirit of St. Louis Airport (SUS) | Chesterfield, Missouri, United States | |
| 6 | 60.74 miles (97.76 km) ESE | Salem–Leckrone Airport (SLO) | Salem, Illinois, United States | |
| 7 | 68.78 miles (110.69 km) NNE | Abraham Lincoln Capital Airport (SPI) | Springfield, Illinois, United States | |
| 8 | 75.13 miles (120.92 km) ESE | Mt. Vernon Airport (MVN) | Mount Vernon, Illinois, United States | |
| 9 | 88.08 miles (141.75 km) SSE | Southern Illinois Airport (MDH) | Carbondale/Murphysboro, Illinois, United States | |
| 10 | 90.73 miles (146.02 km) NE | Decatur Airport (DEC) | Decatur, Illinois, United States | |
| 11 | 95.12 miles (153.07 km) NW | Quincy Regional Airport (UIN) | Quincy, Illinois, United States | |
| 12 | 96.44 miles (155.20 km) SE | Williamson County Regional Airport (MWA) | Marion, Illinois, United States | |
| 13 | 102.97 miles (165.72 km) ENE | Coles County Memorial Airport (MTO) | Mattoon/Charleston, Illinois, United States | |
| 14 | 107.04 miles (172.27 km) WSW | Rolla National Airport (VIH) | Rolla, Missouri, United States | |
| 15 | 115.57 miles (186.00 km) W | Jefferson City Memorial Airport (JEF) | Jefferson City, Missouri, United States | |
| Rank | Distance & Direction | Airport Name & IATA Code | Airport Location | Further Actions |
| 1 | 11,002.15 miles (17,706.21 km) W | Margaret River Airport (MGV) | Margaret River, Western Australia, Australia | |
| 2 | 10,979.99 miles (17,670.53 km) W | Busselton Regional Airport (BQB) | Busselton, Western Australia, Australia | |
| 3 | 10,957.22 miles (17,633.90 km) W | Bunbury Airport (BUY) | Bunbury, Western Australia, Australia | |
| 4 | 10,954.58 miles (17,629.65 km) W | Manjimup Airport (MJP) | Manjimup, Western Australia, Australia | |
| 5 | 10,926.12 miles (17,583.85 km) W | Rottnest Airport (RTS) | Rottnest Island, Western Australia, Australia | |
| 6 | 10,910.74 miles (17,559.09 km) W | Jandakot Airport (JAD) | Jandakot, Western Australia, Australia | |
| 7 | 10,901.55 miles (17,544.30 km) W | Perth Airport (PER) | Perth, Western Australia, Australia | |
| 8 | 10,897.24 miles (17,537.37 km) WSW | Jurien Bay Airport (JUR) | Jurien Bay, Western Australia, Australia | |
| 9 | 10,880.36 miles (17,510.20 km) W | Albany Airport (ALH) | Albany, Western Australia, Australia | |
| 10 | 10,861.31 miles (17,479.54 km) WSW | Geraldton Airport (GET) | Geraldton, Western Australia, Australia | |
| 11 | 10,859.59 miles (17,476.77 km) W | Katanning Airport (KNI) | Katanning, Western Australia, Australia | |
| 12 | 10,841.22 miles (17,447.21 km) WSW | Kalbarri Airport (KAX) | Kalbarri, Western Australia, Australia | |
| 13 | 10,808.74 miles (17,394.93 km) WSW | Morawa Airport (MWB) | Morawa, Western Australia, Australia | |
| 14 | 10,807.95 miles (17,393.67 km) WSW | Mullewa Airport (MXU) | Mullewa, Western Australia, Australia | |
| 15 | 10,799.72 miles (17,380.43 km) WSW | Shark Bay Airport (MJK) | Monkey Mia, Western Australia, Australia | |