Nonstop flight route between Siena, Italy and Denver, Colorado, United States:

About this route:

A direct, nonstop flight between Siena-Ampugnano Airport (SAY), Siena, Italy and Rocky Mountain Metropolitan Airport (BJC), Denver, Colorado, United States would travel a Great Circle distance of 5,456 miles (or 8,780 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 Siena-Ampugnano Airport and Rocky Mountain Metropolitan 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 Siena-Ampugnano Airport and Rocky Mountain Metropolitan 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 Siena-Ampugnano Airport (SAY):

• During World War II, the facility was known as Malignano Airfield.
• Siena-Ampugnano Airport handled 3,745 passengers last year.
• Because of Siena-Ampugnano Airport's relatively low elevation of 634 feet, planes can take off or land at Siena-Ampugnano 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 Siena-Ampugnano Airport (SAY) is Grosseto Airport (GRS), which is located 36 miles (57 kilometers) SSW of SAY.
• The furthest airport from Siena-Ampugnano Airport (SAY) is Chatham Islands (CHT), which is nearly antipodal to Siena-Ampugnano Airport (meaning Siena-Ampugnano Airport is almost on the exact opposite side of the Earth from Chatham Islands), and is located 12,049 miles (19,391 kilometers) away in Waitangi, Chatham Islands, New Zealand.
• In addition to being known as "Siena-Ampugnano Airport", other names for SAY include "Aeroporto di Siena-Ampugnano" and "Siena-Ampugnano".
• Siena-Ampugnano Airport (SAY) currently has only 1 runway.

Facts about Rocky Mountain Metropolitan Airport (BJC):

• The USDA Forest Service maintains its Jefferson County Tanker Base at the airport.
• The airport was formerly a hub for Pet Airways before ceasing all flights in early 2013.
• Rocky Mountain Metropolitan Airport (BJC) has 3 runways.
• The closest airport to Rocky Mountain Metropolitan Airport (BJC) is Boulder Municipal Airport (WBU), which is located only 11 miles (17 kilometers) NNW of BJC.
• This airport is included in the National Plan of Integrated Airport Systems for 2011–2015, which categorized it as a reliever airport.
• Because of Rocky Mountain Metropolitan Airport's high elevation of 5,673 feet, planes must typically fly at a faster airspeed in order to takeoff or land at BJC. Combined with a high temperature, this could make BJC a "Hot & High" airport, where the air density is lower than it would otherwise be at sea level.
• Rocky Mountain Metropolitan Airport is a public-use airport located near Broomfield, Colorado, United States.
• The furthest airport from Rocky Mountain Metropolitan Airport (BJC) is Sir Gaëtan Duval Airport (RRG), which is located 10,886 miles (17,519 kilometers) away in Rodrigues Island, Mauritius.