The flight distance from Tribhuvan International Airport (KTM) in Kathmandu, Nepal to Union Island International Airport (UNI) in Union Island, Saint Vincent is 14,279 kilometers (8,873 miles / 7,710 nautical miles). The estimated flight time for this route is approximately 18h, flying northwest at a heading of 317°.

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 Nepal with Saint Vincent. It is an intercontinental flight between Asia and North America. Travelers should check visa requirements, customs regulations, and any travel advisories before booking.

Time zone information: When it's 14:43 in Kathmandu, it's 04:58 in Union Island. With a 9.75-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 4,374 feet between the two airports. Union Island International Airport sits lower than Tribhuvan International Airport.

The return flight from Union Island (UNI) to Kathmandu (KTM) follows a heading of 38° (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 Tribhuvan International Airport (KTM) and Union Island International Airport (UNI) detail pages, or use our flight duration calculator to compare other routes.