The flight distance from Rocky Mountain Metro Airport (BJC) in Denver, United States to Netaji Subhash Chandra Bose International Airport (CCU) in Kolkata, India is 12,918 kilometers (8,027 miles / 6,975 nautical miles). The estimated flight time for this route is approximately 16h, flying north northwest at a heading of 346°.

This is an ultra-long-haul route, one of the longest in aviation. It requires wide-body aircraft with extended range capability such as the Airbus A350-900ULR or Boeing 777-200LR. Passengers should prepare for an extended flight with multiple meal services.

This is an international route connecting United States with India. It is an intercontinental flight between North America and Asia. Travelers should check visa requirements, customs regulations, and any travel advisories before booking.

Time zone information: When it's 18:28 in Denver, it's 06:58 in Kolkata. With a 12.5-hour time difference, travelers should plan for significant jet lag. It typically takes one day per hour of time difference to fully adjust.

There is a significant elevation difference of 5,657 feet between the two airports. Netaji Subhash Chandra Bose International Airport sits lower than Rocky Mountain Metro Airport. Travelers arriving at the higher-elevation airport should be aware of potential altitude effects.

The return flight from Kolkata (CCU) to Denver (BJC) follows a heading of 12° (north northeast). Actual flight times may vary depending on wind conditions, air traffic, and the specific aircraft used.

For more information about these airports, visit the Rocky Mountain Metro Airport (BJC) and Netaji Subhash Chandra Bose International Airport (CCU) detail pages, or use our flight duration calculator to compare other routes.