The flight distance from San Luis Valley Regional/Bergman Field (ALS) in Alamosa, United States to Netaji Subhash Chandra Bose International Airport (CCU) in Kolkata, India is 13,167 kilometers (8,182 miles / 7,110 nautical miles). The estimated flight time for this route is approximately 16h, flying north northwest at a heading of 345°.

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 05:24 in Alamosa, it's 17:54 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 7,524 feet between the two airports. Netaji Subhash Chandra Bose International Airport sits lower than San Luis Valley Regional/Bergman Field. Travelers arriving at the higher-elevation airport should be aware of potential altitude effects.

The return flight from Kolkata (CCU) to Alamosa (ALS) follows a heading of 13° (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 San Luis Valley Regional/Bergman Field (ALS) and Netaji Subhash Chandra Bose International Airport (CCU) detail pages, or use our flight duration calculator to compare other routes.