Nonstop flight route between Alton, Illinois, United States and Arapahoe County, Colorado, United States:
Departure Airport:
(38°53'25"N by 90°2'45"W)
Arrival Airport:
(39°34'12"N by 104°50'57"W)
Distance from ALN to APA:
792.78 miles (1,275.85 km)
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Jump to:
- About this route
- ALN Airport Information
- APA Airport Information
- Facts about ALN
- Facts about APA
- Map of Nearest Airports to ALN
- List of Nearest Airports to ALN
- Map of Furthest Airports from ALN
- List of Furthest Airports from ALN
- Map of Nearest Airports to APA
- List of Nearest Airports to APA
- Map of Furthest Airports from APA
- List of Furthest Airports from APA
About this route:
A direct, nonstop flight between St. Louis Regional Airport (ALN), Alton, Illinois, United States and Centennial Airport (APA), Arapahoe County, Colorado, United States would travel a Great Circle distance of 793 miles (or 1,276 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 St. Louis Regional Airport and Centennial Airport, the route shown on this map most likely still appears to be a straight line.
Departure 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 |
Arrival Airport Information:
| IATA / ICAO Codes: | APA / KAPA |
| Airport Name: | Centennial Airport |
| Location: | Arapahoe County, Colorado, United States |
| GPS Coordinates: | 39°34'12"N by 104°50'57"W |
| Area Served: | Denver, Colorado |
| Operator/Owner: | Arapahoe County Public Airport Authority |
| Airport Type: | Public |
| Elevation: | 5885 feet (1,794 meters) |
| # of Runways: | 3 |
| View all routes: | Routes from APA |
| More Information: | APA Maps & Info |
Facts about St. Louis Regional Airport (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.
- Its operations are paid for by an airport taxation district created in 1946, which collects taxes from property owners in the Madison County townships of Alton, Wood River, Foster and Fort Russell.
- 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.
- St. Louis Regional Airport (ALN) has 2 runways.
- West Star Aviation is the largest fixed base operations company at the airport.
- Civic Memorial Airport opened in 1946 and received its current name in 1984.
- 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.
Facts about Centennial Airport (APA):
- The closest airport to Centennial Airport (APA) is Denver International Airport (DEN), which is located 22 miles (36 kilometers) NNE of APA.
- Centennial Airport (APA) has 3 runways.
- Because of Centennial Airport's high elevation of 5,885 feet, planes must typically fly at a faster airspeed in order to takeoff or land at APA. Combined with a high temperature, this could make APA a "Hot & High" airport, where the air density is lower than it would otherwise be at sea level.
- The furthest airport from Centennial Airport (APA) is Sir Gaëtan Duval Airport (RRG), which is located 10,899 miles (17,540 kilometers) away in Rodrigues Island, Mauritius.
- Centennial Airport does not offer scheduled airline passenger service.
- Centennial Airport is a public use airport in Arapahoe County, Colorado, United States.
- Located in Dove Valley, an unincorporated area of Arapahoe County, the airport’s runways extend into Douglas County.
| 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 | |
| Rank | Distance & Direction | Airport Name & IATA Code | Airport Location | Further Actions |
| 1 | 22.23 miles (35.77 km) NNE | Denver International Airport (DEN) | Denver, Colorado, United States | |
| 2 | 27.40 miles (44.09 km) NNW | Rocky Mountain Metropolitan Airport (BJC) | Denver, Colorado, United States | |
| 3 | 38.09 miles (61.31 km) NNW | Boulder Municipal Airport (WBU) | Boulder, Colorado, United States | |
| 4 | 40.06 miles (64.47 km) S | United States Air Force Academy (AFF) | Colorado Springs, Colorado, United States | |
| 5 | 53.40 miles (85.93 km) S | City of Colorado Springs Municipal Airport (COS) | Colorado Springs, Colorado, United States | |
| 6 | 61.02 miles (98.21 km) N | Greeley-Weld County Airport (GXY) | Greeley, Colorado, United States | |
| 7 | 61.54 miles (99.03 km) N | Fort Collins-Loveland Municipal Airport (FNL) | Fort Collins/Loveland, Colorado, United States | |
| 8 | 81.98 miles (131.94 km) WSW | Lake County Airport (LXV) | Leadville, Colorado, United States | |
| 9 | 90.51 miles (145.66 km) SSE | Pueblo Memorial Airport (PUB) | Pueblo, Colorado, United States | |
| 10 | 95.91 miles (154.35 km) ENE | Colorado Plains Regional Airport (AKO) | Akron, Colorado, United States | |
| 11 | 96.02 miles (154.53 km) SW | Harriet Alexander Field (SLT) | Salida, Colorado, United States | |
| 12 | 108.00 miles (173.81 km) N | Francis E. Warren Air Force Base (FEW) | Cheyenne, Wyoming, United States | |
| 13 | 109.57 miles (176.34 km) N | Cheyenne Regional Airport (CYS) | Cheyenne, Wyoming, United States | |
| 14 | 110.21 miles (177.37 km) W | Eagle County Regional Airport (EGE) | Eagle, Colorado (near Vail), United States | |
| 15 | 110.46 miles (177.76 km) WSW | Aspen–Pitkin County Airport (ASE) | Aspen, Colorado, United States | |
| Rank | Distance & Direction | Airport Name & IATA Code | Airport Location | Further Actions |
| 1 | 10,899.07 miles (17,540.31 km) SSE | Sir Gaëtan Duval Airport (RRG) | Rodrigues Island, Mauritius | |
| 2 | 10,757.90 miles (17,313.12 km) SE | Sir Seewoosagur Ramgoolam International Airport (MRU) | Plaisance, Mauritius | |
| 3 | 10,721.36 miles (17,254.31 km) SE | Pierrefonds Airport (ZSE) | Saint-Pierre, Réunion | |
| 4 | 10,701.44 miles (17,222.25 km) SE | Roland Garros Airport (RUN) | St Denis, Réunion, France | |
| 5 | 10,520.75 miles (16,931.47 km) ESE | Tôlanaro Airport (FTU) | Tôlanaro, Madagascar | |
| 6 | 10,410.99 miles (16,754.82 km) ESE | Mananjary Airport (MNJ) | Mananjary, Madagascar | |
| 7 | 10,396.62 miles (16,731.70 km) ESE | Ampanihy Airport (AMP) | Ampanihy, Madagascar | |
| 8 | 10,364.97 miles (16,680.77 km) ESE | Fianarantsoa Airport (WFI) | Fianarantsoa, Madagascar | |
| 9 | 10,300.32 miles (16,576.72 km) SE | Toamasino Airport (TMM) | Toamasina, Madagascar | |
| 10 | 10,264.43 miles (16,518.95 km) SE | Sainte Marie Airport (SMS) | Île Sainte-Marie, Madagascar | |
| 11 | 10,251.95 miles (16,498.87 km) ESE | Ivato International Airport (TNR) | Antananarivo, Madagascar | |
| 12 | 10,231.40 miles (16,465.80 km) ESE | Manja Airport (MJA) | Manja, Menabe, Madagascar | |
| 13 | 10,212.09 miles (16,434.73 km) ESE | Andavadoaka Airport (DVD) | Andavadoaka, Toliara province, Atsimo-Andrefana region, Madagascar | |
| 14 | 10,209.72 miles (16,430.91 km) W | Margaret River Airport (MGV) | Margaret River, Western Australia, Australia | |
| 15 | 10,201.21 miles (16,417.21 km) ESE | Morombe Airport (MXM) | Morombe, Madagascar | |