Nonstop flight route between Fort Greely, Delta Junction, Alaska, United States and Helena, Montana, United States:
Departure Airport:
 
    Arrival Airport:
 
    Distance from BIG to HLN:
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- About this route
- BIG Airport Information
- HLN Airport Information
- Facts about BIG
- Facts about HLN
- Map of Nearest Airports to BIG
- List of Nearest Airports to BIG
- Map of Furthest Airports from BIG
- List of Furthest Airports from BIG
- Map of Nearest Airports to HLN
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About this route:
A direct, nonstop flight between Allen Army Airfield (BIG), Fort Greely, Delta Junction, Alaska, United States and Helena Regional Airport (HLN), Helena, Montana, United States would travel a Great Circle distance of 1,753 miles (or 2,821 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 Allen Army Airfield and Helena Regional Airport, the route shown on this map most likely still appears to be a straight line.
Departure Airport Information:
| IATA / ICAO Codes: | BIG / PABI | 
| Airport Names: | 
 | 
| Location: | Fort Greely, Delta Junction, Alaska, United States | 
| GPS Coordinates: | 63°59'43"N by 145°43'11"W | 
| Area Served: | Fort Greely, Alaska | 
| Operator/Owner: | United States Army | 
| Airport Type: | Public / Military | 
| Elevation: | 1291 feet (393 meters) | 
| # of Runways: | 3 | 
| View all routes: | Routes from BIG | 
| More Information: | BIG Maps & Info | 
Arrival Airport Information:
| IATA / ICAO Codes: | HLN / KHLN | 
| Airport Names: | 
 | 
| Location: | Helena, Montana, United States | 
| GPS Coordinates: | 46°36'24"N by 111°58'58"W | 
| Area Served: | Helena, Montana | 
| Operator/Owner: | Helena Regional Airport Authority | 
| Airport Type: | Public | 
| Elevation: | 3877 feet (1,182 meters) | 
| # of Runways: | 3 | 
| View all routes: | Routes from HLN | 
| More Information: | HLN Maps & Info | 
Facts about Allen Army Airfield (BIG):
- In addition to being known as "Allen Army Airfield", another name for BIG is "(former Big Delta Army Airfield)".
- The closest airport to Allen Army Airfield (BIG) is Delta Junction Airport (DJN), which is located only 4 miles (6 kilometers) N of BIG.
- The furthest airport from Allen Army Airfield (BIG) is Port Elizabeth International Airport (PLZ), which is located 10,331 miles (16,625 kilometers) away in Port Elizabeth, South Africa.
- Established in 1942 as Big Delta Army Airfield, it was named for river delta formed by the confluence of the Delta River and the Tanana River.
- Allen Army Airfield (BIG) has 3 runways.
Facts about Helena Regional Airport (HLN):
- The closest airport to Helena Regional Airport (HLN) is Bert Mooney Airport (BTM), which is located 51 miles (83 kilometers) SSW of HLN.
- Helena Regional Airport (HLN) has 3 runways.
- In addition to being known as "Helena Regional Airport", another name for HLN is "Helena Army Airfield".
- The furthest airport from Helena Regional Airport (HLN) is Sir Gaëtan Duval Airport (RRG), which is located 10,563 miles (17,000 kilometers) away in Rodrigues Island, Mauritius.
- Helena Regional Airport covers 1,224 acres at an elevation of 3,877 feet.




