Are there nonstop flights from Osaka (KIX) to Kathmandu (KTM)?

No. The fastest connection is via Qingdao, about 6h 37m of total flying time.

What is the fastest connection from Osaka (KIX) to Kathmandu (KTM)?

via Qingdao ≈ 6h 37m, via Chengdu ≈ 6h 38m, via Chongqing ≈ 6h 40m (estimated flying time, excluding layovers).

from 19,000 ANA miles, from 23,000 JAL miles (economy, one way, based on the published award charts).

Kansai International Airport (KIX) to Tribhuvan International Airport (KTM)・4,763 km

No nonstop flights. The fastest connection is via Qingdao (TAO), about 6h 37m of flying time (layover not included).

With milesANA 19,000 miles+ (via BKK)JAL 23,000 miles+ (via ICN)Economy, one way, estimate. Tap a connection for miles by cabin.

None.

12 one-stop options, sorted by estimated flying time. Tap one to see the airlines on each leg and booking links.

Times are estimated from distance. Check schedules, frequency and availability with the airline or a booking site.