The flight distance from St Louis Regional Airport (ALN) in Alton/St Louis, United States to Indira Gandhi International Airport (DEL) in New Delhi, India is 12,396 kilometers (7,703 miles / 6,693 nautical miles). The estimated flight time for this route is approximately 16h, flying north northeast at a heading of 12°.

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 00:14 in Alton/St Louis, it's 10:44 in New Delhi. With a 10.5-hour time difference, travelers should plan for significant jet lag. It typically takes one day per hour of time difference to fully adjust.

The return flight from New Delhi (DEL) to Alton/St Louis (ALN) follows a heading of 349° (north). Actual flight times may vary depending on wind conditions, air traffic, and the specific aircraft used.

For more information about these airports, visit the St Louis Regional Airport (ALN) and Indira Gandhi International Airport (DEL) detail pages, or use our flight duration calculator to compare other routes.