Nonstop flight route between Rockford, Illinois, United States and St. Mary's, Alaska, United States:
Departure Airport:
(42°11'43"N by 89°5'49"W)
Arrival Airport:
(62°3'38"N by 163°18'6"W)
Distance from RFD to KSM:
3,215.54 miles (5,174.89 km)
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Jump to:
- About this route
- RFD Airport Information
- KSM Airport Information
- Facts about RFD
- Facts about KSM
- Map of Nearest Airports to RFD
- List of Nearest Airports to RFD
- Map of Furthest Airports from RFD
- List of Furthest Airports from RFD
- Map of Nearest Airports to KSM
- List of Nearest Airports to KSM
- Map of Furthest Airports from KSM
- List of Furthest Airports from KSM
About this route:
A direct, nonstop flight between Chicago Rockford International Airport (RFD), Rockford, Illinois, United States and St. Mary's Airport (KSM), St. Mary's, Alaska, United States would travel a Great Circle distance of 3,216 miles (or 5,175 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 Chicago Rockford International Airport and St. Mary's 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 Chicago Rockford International Airport and St. Mary's Airport. You'll see that it will travel the same route of the red line on this map!
Departure Airport Information:
| IATA / ICAO Codes: | RFD / KRFD |
| Airport Name: | Chicago Rockford International Airport |
| Location: | Rockford, Illinois, United States |
| GPS Coordinates: | 42°11'43"N by 89°5'49"W |
| Area Served: | Rockford, Illinois |
| Operator/Owner: | Greater Rockford Airport Authority |
| Airport Type: | Public |
| Elevation: | 742 feet (226 meters) |
| # of Runways: | 2 |
| View all routes: | Routes from RFD |
| More Information: | RFD Maps & Info |
Arrival Airport Information:
| IATA / ICAO Codes: | KSM / PASM |
| Airport Name: | St. Mary's Airport |
| Location: | St. Mary's, Alaska, United States |
| GPS Coordinates: | 62°3'38"N by 163°18'6"W |
| Operator/Owner: | Alaska DOT&PF |
| Airport Type: | Public |
| Elevation: | 312 feet (95 meters) |
| # of Runways: | 2 |
| View all routes: | Routes from KSM |
| More Information: | KSM Maps & Info |
Facts about Chicago Rockford International Airport (RFD):
- Because of Chicago Rockford International Airport's relatively low elevation of 742 feet, planes can take off or land at Chicago Rockford International 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 Chicago Rockford International Airport (RFD) is Southern Wisconsin Regional Airport (JVL), which is located 30 miles (47 kilometers) N of RFD.
- The current terminal was built in 1987 in an effort to expand airline service in Rockford, but the common use of bus service to O'Hare International Airport kept most airlines away from Rockford.
- The furthest airport from Chicago Rockford International Airport (RFD) is Margaret River Airport (MGV), which is located 11,008 miles (17,716 kilometers) away in Margaret River, Western Australia, Australia.
- RFD has two cargo aprons in use.
- Chicago Rockford International Airport (RFD) has 2 runways.
- Several airlines have previously served the airport including United Express, Hooters Air, Frontier, Midwest Connect, Midway Connection, Trans Meridian, American Eagle, TWA, Ozark, McClain, Direct Air, Northwest Airlink, etc.
Facts about St. Mary's Airport (KSM):
- Because of St. Mary's Airport's relatively low elevation of 312 feet, planes can take off or land at St. Mary's 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.
- St. Mary's Airport (KSM) has 2 runways.
- The closest airport to St. Mary's Airport (KSM) is Mountain Village Airport (MOU), which is located only 13 miles (20 kilometers) W of KSM.
- The furthest airport from St. Mary's Airport (KSM) is Cape Town International Airport (CPT), which is located 10,494 miles (16,889 kilometers) away in Cape Town, South Africa.
| Rank | Distance & Direction | Airport Name & IATA Code | Airport Location | Further Actions |
| 1 | 29.50 miles (47.48 km) N | Southern Wisconsin Regional Airport (JVL) | Janesville, Wisconsin, United States |     |
| 2 | 43.30 miles (69.69 km) SE | Chicago/Aurora Municipal Airport (AUZ) | Aurora, Illinois, United States | |
| 3 | 47.89 miles (77.08 km) ESE | DuPage Airport (DPA) | West Chicago, Illinois, United States | |
| 4 | 58.34 miles (93.89 km) S | Illinois Valley Regional Airport (VYS) | Peru, Illinois, United States | |
| 5 | 61.49 miles (98.96 km) E | Chicago Executive Airport (PWK) | Chicago/Prospect Heights/Wheeling, Illinois, United States | |
| 6 | 62.95 miles (101.31 km) ESE | Chicago O'Hare International Airport (ORD) | Chicago, Illinois, United States | |
| 7 | 64.75 miles (104.20 km) ENE | Waukegan National Airport (UGN) | Chicago / Waukegan, Illinois, United States | |
| 8 | 65.58 miles (105.55 km) SE | Lewis University Airport (LOT) | Chicago / Romeoville, Illinois, United States | |
| 9 | 65.77 miles (105.84 km) ENE | Kenosha Regional Airport (ENW) | Kenosha, Wisconsin, United States | |
| 10 | 66.39 miles (106.84 km) N | Dane County Regional Airport (MSN) | Madison, Wisconsin, United States | |
| 11 | 66.64 miles (107.25 km) SE | Joliet Regional Airport (JOT) | Joliet, Illinois, United States | |
| 12 | 68.06 miles (109.54 km) WSW | Clinton Municipal Airport (CWI) | Clinton, Iowa, United States | |
| 13 | 73.00 miles (117.48 km) NE | Waukesha County Airport (UES) | Waukesha, Wisconsin, United States | |
| 14 | 74.62 miles (120.09 km) ESE | Chicago Midway International Airport (MDW) | Chicago, Illinois, United States | |
| 15 | 76.11 miles (122.49 km) ENE | John H. Batten Airport (RAC) | Racine, Wisconsin, United States | |
| Rank | Distance & Direction | Airport Name & IATA Code | Airport Location | Further Actions |
| 1 | 11,008.37 miles (17,716.21 km) WSW | Margaret River Airport (MGV) | Margaret River, Western Australia, Australia | |
| 2 | 10,984.97 miles (17,678.55 km) WSW | Busselton Regional Airport (BQB) | Busselton, Western Australia, Australia | |
| 3 | 10,968.42 miles (17,651.92 km) WSW | Manjimup Airport (MJP) | Manjimup, Western Australia, Australia | |
| 4 | 10,960.25 miles (17,638.77 km) WSW | Bunbury Airport (BUY) | Bunbury, Western Australia, Australia | |
| 5 | 10,915.23 miles (17,566.32 km) WSW | Rottnest Airport (RTS) | Rottnest Island, Western Australia, Australia | |
| 6 | 10,907.02 miles (17,553.10 km) W | Albany Airport (ALH) | Albany, Western Australia, Australia | |
| 7 | 10,902.27 miles (17,545.45 km) WSW | Jandakot Airport (JAD) | Jandakot, Western Australia, Australia | |
| 8 | 10,891.99 miles (17,528.92 km) WSW | Perth Airport (PER) | Perth, Western Australia, Australia | |
| 9 | 10,873.66 miles (17,499.41 km) WSW | Katanning Airport (KNI) | Katanning, Western Australia, Australia | |
| 10 | 10,868.46 miles (17,491.04 km) WSW | Jurien Bay Airport (JUR) | Jurien Bay, Western Australia, Australia | |
| 11 | 10,817.93 miles (17,409.73 km) WSW | Geraldton Airport (GET) | Geraldton, Western Australia, Australia | |
| 12 | 10,786.63 miles (17,359.36 km) WSW | Kalbarri Airport (KAX) | Kalbarri, Western Australia, Australia | |
| 13 | 10,775.52 miles (17,341.48 km) WSW | Morawa Airport (MWB) | Morawa, Western Australia, Australia | |
| 14 | 10,766.29 miles (17,326.62 km) WSW | Mullewa Airport (MXU) | Mullewa, Western Australia, Australia | |
| 15 | 10,728.09 miles (17,265.14 km) SW | Shark Bay Airport (MJK) | Monkey Mia, Western Australia, Australia | |
| Rank | Distance & Direction | Airport Name & IATA Code | Airport Location | Further Actions |
| 1 | 12.52 miles (20.15 km) W | Mountain Village Airport (MOU) | Mountain Village, Alaska, United States | |
| 2 | 15.71 miles (25.28 km) ESE | Pilot Station Airport (PQS) | Pilot Station, Alaska, United States | |
| 3 | 43.61 miles (70.18 km) ESE | Marshall Don Hunter Sr. Airport (MLL) | Marshall, Alaska, United States | |
| 4 | 58.95 miles (94.87 km) WNW | Sheldon Point Airport (SXP) | Sheldon Point, Alaska, United States | |
| 5 | 61.02 miles (98.20 km) NW | Alakanuk Airport (AUK) | Alakanuk, Alaska, United States | |
| 6 | 62.90 miles (101.24 km) NW | Emmonak Airport (EMK) | Emmonak, Alaska, United States | |
| 7 | 67.40 miles (108.48 km) N | Kotlik Airport (KOT) | Kotlik, Alaska, United States | |
| 8 | 67.43 miles (108.52 km) ESE | Russian Mission Airport (RSH) | Russian Mission, Alaska, United States | |
| 9 | 75.21 miles (121.04 km) W | Scammon Bay Airport (SCM) | Scammon Bay, Alaska, United States | |
| 10 | 83.21 miles (133.91 km) WSW | Chevak Airport (VAK) | Chevak, Alaska, United States | |
| 11 | 84.72 miles (136.35 km) SSE | Nunapitchuk Airport (NUP) | Nunapitchuk, Alaska, United States | |
| 12 | 85.97 miles (138.35 km) SSE | Kasigluk Airport (KUK) | Kasigluk, Alaska, United States | |
| 13 | 88.49 miles (142.42 km) W | Cape Romanzof Air Force Station Cape Romanzof Long Range Radar Site (CZF) | Cape Romanzof, Alaska, United States | |
| 14 | 89.19 miles (143.53 km) SSW | Newtok Airport (WWT) | Newtok, Alaska, United States | |
| 15 | 89.22 miles (143.59 km) SSE | Atmautluak Airport (ATT) | Atmautluak, Alaska, United States | |
| Rank | Distance & Direction | Airport Name & IATA Code | Airport Location | Further Actions |
| 1 | 10,494.08 miles (16,888.54 km) S | Cape Town International Airport (CPT) | Cape Town, South Africa | |
| 2 | 10,482.44 miles (16,869.80 km) S | George Airport (GRJ) | George, South Africa | |
| 3 | 10,457.83 miles (16,830.21 km) SSW | Port Elizabeth International Airport (PLZ) | Port Elizabeth, South Africa | |
| 4 | 10,416.76 miles (16,764.12 km) SSW | Port Alfred Airport (AFD) | Port Alfred, South Africa | |
| 5 | 10,371.90 miles (16,691.92 km) SSW | East London Airport (ELS) | East London, South Africa | |
| 6 | 10,261.64 miles (16,514.46 km) SSW | Mthatha Airport (UTT) | Mthatha, South Africa | |
| 7 | 10,199.66 miles (16,414.71 km) S | Kleinsee Airport (KLZ) | Kleinzee, South Africa | |
| 8 | 10,195.75 miles (16,408.43 km) SSW | Margate Airport (MGH) | Margate, KwaZulu-Natal, South Africa | |
| 9 | 10,169.94 miles (16,366.89 km) S | Aggeneys Airport (AGZ) | Aggeneys, South Africa | |
| 10 | 10,169.94 miles (16,366.89 km) S | Wild Coast Sun Airport (MZF) | Mzamba, South Africa | |
| 11 | 10,157.43 miles (16,346.75 km) SSW | Mafeteng Airport (MFC) | Mafeteng, Lesotho | |
| 12 | 10,151.99 miles (16,338.00 km) SSW | Semonkong Airport (SOK) | Semonkong, Lesotho | |
| 13 | 10,149.37 miles (16,333.79 km) SSW | Lebakeng Airport (LEF) | Lebakeng, Lesotho | |
| 14 | 10,143.31 miles (16,324.03 km) SSW | Lesobeng Airport (LES) | Lesobeng, Lesotho | |
| 15 | 10,133.50 miles (16,308.25 km) SE | Teniente Rodolfo Marsh Airport (TNM) | Villa Las Estrellas, Antarctica | |