The flight distance from Tribhuvan International Airport (KTM) in Kathmandu, Nepal to Osan Air Base (OSN) in Osan Air Base, South Korea is 4,015 kilometers (2,495 miles / 2,168 nautical miles). The estimated flight time for this route is approximately 6h, flying east northeast at a heading of 64°.

This is a long-haul route typically operated by wide-body aircraft such as the Boeing 777 or Airbus A350. Full meal service, in-flight entertainment, and comfort amenities are standard.

This is an international route connecting Nepal with South Korea. Travelers should check visa requirements, customs regulations, and any travel advisories before booking.

Time zone information: When it's 20:35 in Kathmandu, it's 23:50 in Osan Air Base. The 3.25-hour time difference may cause some jet lag. Most travelers adjust within a day or two.

There is a significant elevation difference of 4,352 feet between the two airports. Osan Air Base sits lower than Tribhuvan International Airport.

The return flight from Osan Air Base (OSN) to Kathmandu (KTM) follows a heading of 267° (west). 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 Osan Air Base (OSN) detail pages, or use our flight duration calculator to compare other routes.