Are there nonstop flights from Shannan (LXA) to Singapore (SIN)?

Yes. West Air fly this route. Flight time is about 4h 30m.

What is the fastest connection from Shannan (LXA) to Singapore (SIN)?

via Kunming ≈ 5h 37m, via Kathmandu ≈ 5h 50m, via Nanning ≈ 6h 3m (estimated flying time, excluding layovers).

from 18,000 ANA miles, from 23,000 JAL miles (economy, one way, based on the published award charts).

Lhasa Gonggar International Airport (LXA) to Singapore Changi Airport (SIN)・3,402 km

Nonstop flights available (1 airline). Flight time about 4h 30m. Nonstop return flights also operate.

With milesANA 18,000 miles+ (via TFU)JAL 23,000 miles+ (via KMG)Economy, one way, estimate. Tap a connection for miles by cabin.

21 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.