Nonstop flight route between Reading, Pennsylvania, United States and St. Mary's, Alaska, United States:

About this route:

A direct, nonstop flight between Reading Regional Airport (RDG), Reading, Pennsylvania, United States and St. Mary's Airport (KSM), St. Mary's, Alaska, United States would travel a Great Circle distance of 3,726 miles (or 5,996 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 Reading Regional 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 Reading Regional 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:

Arrival Airport Information:

Facts about Reading Regional Airport (RDG):

• Because of Reading Regional Airport's relatively low elevation of 344 feet, planes can take off or land at Reading 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.
• Opened as a civil airport in April 1938, Reading Airport was used by the United States Army Air Forces First Air Force as a training airfield during World War II.
• The closest airport to Reading Regional Airport (RDG) is Heritage Field (PTW), which is located 24 miles (38 kilometers) ESE of RDG.
• The furthest airport from Reading Regional Airport (RDG) is Margaret River Airport (MGV), which is located 11,683 miles (18,802 kilometers) away in Margaret River, Western Australia, Australia.
• Since the 1950s the airport has been home to the Reading Composite Squadron of the U.S.
• Reading Regional Airport (RDG) has 2 runways.
• On 11 November 1943 the 26th was reassigned to Camp Campbell, Kentucky to train with the 101st Airborne Division before deploying to England, and engaging in combat operations as part of Ninth Air Force.
• On 1 June 1944 the 309th Air Base Squadron was re-designated the 85th Army Air Force Base Unit.
• In addition to being known as "Reading Regional Airport", another name for RDG is "Carl A. Spaatz FieldReading Army Airfield".

Facts about St. Mary's Airport (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.
• 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.