Nonstop flight route between Mascot (near Sydney), Australia and Helena, Montana, United States:

About this route:

A direct, nonstop flight between Sydney (Kingsford Smith) Airport (SYD), Mascot (near Sydney), Australia and Helena Regional Airport (HLN), Helena, Montana, United States would travel a Great Circle distance of 8,172 miles (or 13,151 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 Sydney (Kingsford Smith) Airport and Helena Regional 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 Sydney (Kingsford Smith) Airport and Helena Regional 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 Sydney (Kingsford Smith) Airport (SYD):

• The furthest airport from Sydney (Kingsford Smith) Airport (SYD) is Santa Maria Airport (SMA), which is nearly antipodal to Sydney (Kingsford Smith) Airport (meaning Sydney (Kingsford Smith) Airport is almost on the exact opposite side of the Earth from Santa Maria Airport), and is located 12,144 miles (19,543 kilometers) away in Santa Maria, Portugal.
• The closest airport to Sydney (Kingsford Smith) Airport (SYD) is Bankstown Airport (BWU), which is located only 11 miles (18 kilometers) W of SYD.
• Terminal 2, located in the airport's north-eastern section, was the former home of Ansett Australia's domestic operations.
• Because of Sydney (Kingsford Smith) Airport's relatively low elevation of 21 feet, planes can take off or land at Sydney (Kingsford Smith) 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 airport is accessible via the Airport Link underground rail line.
• In addition to the curfew, Sydney Airport also has a cap of 80 aircraft movements per hour which cannot be exceeded, leading to increased delays during peak hours.
• The area that the airport was situated was originally a bullock paddock.Nigel Love, a former wartime pilot, was looking into the possibilities for aviation in Australia.
• In addition to being known as "Sydney (Kingsford Smith) Airport", another name for SYD is "Kingsford-Smith Airport".
• Terminal 3 is a domestic terminal, serving Qantas with QantasLink flights having moved their operations from Terminal 2 to Terminal 3 on 16 August 2013 Originally, it was home for Trans Australia Airlines.
• Sydney (Kingsford Smith) Airport (SYD) 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 covers 1,224 acres at an elevation of 3,877 feet.
• Helena Regional Airport (HLN) has 3 runways.
• 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.
• In addition to being known as "Helena Regional Airport", another name for HLN is "Helena Army Airfield".