Are there nonstop flights from Tokyo (NRT) to Phnom Penh (KTI)?

Yes. Air Cambodia fly this route. Flight time is about 5h 46m.

What is the fastest connection from Tokyo (NRT) to Phnom Penh (KTI)?

via Taipei ≈ 6h 16m, via Xiamen ≈ 6h 17m, via Fuzhou ≈ 6h 17m (estimated flying time, excluding layovers).

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

Narita International Airport (NRT) to Techo International Airport (KTI)・4,478 km

Nonstop flights available (1 airline). Flight time about 5h 46m. Nonstop return flights also operate.

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

28 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.