Nonstop flight route between Derry, Northern Ireland, United Kingdom and Helena, Montana, United States:

About this route:

A direct, nonstop flight between City of Derry Airport (LDY), Derry, Northern Ireland, United Kingdom and Helena Regional Airport (HLN), Helena, Montana, United States would travel a Great Circle distance of 4,169 miles (or 6,709 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 City of Derry 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 City of Derry 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 City of Derry Airport (LDY):

• At the end of 2008, British Airways, operated by Loganair as a franchise agreement, ceased the Glasgow International route which had operated for 30 years, following the loss in July 2008 of their public service obligation route to Dublin.
• The recently completed runway safety zone extension and apron works has allowed the CAA to lift the capacity restriction on aircraft operating out of the airport.
• City of Derry Airport (LDY) currently has only 1 runway.
• The closest airport to City of Derry Airport (LDY) is Belfast International Airport (BFS), which is located 46 miles (74 kilometers) SE of LDY.
• Ryanair also discontinued the Bristol route and changed its Derry–East Midlands route to Derry–Birmingham announcing new flights to London Luton and the airport's first scheduled international service to Alicante which commenced in June 2009.
• In May 2006, the European Commission gave its approval for the British and Irish governments to invest €15 million in the airport.
• In June 2010 it was announced that the Airport was in the final stages of discussion with the Balfour Beatty Group about a management contract, with the objective of bringing additional commercial experience and resources to the Airport for the economic benefit of the region and to reduce the subvention from the City Council.
• Because of City of Derry Airport's relatively low elevation of 23 feet, planes can take off or land at City of Derry 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 furthest airport from City of Derry Airport (LDY) is Ryan's Creek Aerodrome (SZS), which is located 11,838 miles (19,051 kilometers) away in Stewart Island, New Zealand.
• City of Derry Airport handled 384,973 passengers last year.
• In addition to being known as "City of Derry Airport", another name for LDY is "Londonderry/Eglinton Airport[1]".
• Passenger numbers in 2013 were 384,973, a 3.3% decrease compared with 2012.
• In mid-2009 work commenced on dualling the A2 from Maydown to Eglinton and the airport, which now provides a high speed dual carriageway connection to the city.

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.