Which is the busiest airport in Kathmandu?

Tribhuvan International Airport (KTM), with 7,327,042 passengers a year in open data.

Kathmandu airports

2 airports

Code	Airport	Serves	Passengers / year	Routes
KTM	Tribhuvan International Airport	Kathmandu	7,327,042	7
JKR	Janakpur Airport	Kathmandu	136,678	—

	KTM	JKR
KTM	—	123
JKR	123	—

Kilometres, straight line.

Route	To	Distance	Passengers
DEL – KTM	New Delhi, India	817 km	970,919
BOM – KTM	Mumbai, India	1,592 km	145,112
IST – KTM	Istanbul, Turkey	5,317 km	98,280
BLR – KTM	Bengaluru, India	1,791 km	55,750
ICN – KTM	Seoul, South Korea	3,973 km	15,757 (6 mo)
KTM – VNS	Varanasi, India	352 km	12,715
CCU – KTM	Kolkata, India	639 km	4,011

Kathmandu has 2 airports with scheduled flights: KTM (Tribhuvan International Airport), JKR (Janakpur Airport).