Tribhuvan International Airport is served by 27 airlines, flying from/to 38 destinationsLongest flight from Tribhuvan International Airport is Kathmandu to 🇹🇷 Istanbul (IST), which takes around 8 hours and 25 minutes. On an airline like Turkish Airlines. More info on this flight route (KTM-IST).Shortest flight from Tribhuvan International Airport is Kathmandu to 🇳🇵 Simara (SIF), which takes around 20 minutes. On an airline like Yeti Airlines. More info on this flight route (KTM-SIF).