Are there nonstop flights from Milan (MXP) to Shenzhen (SZX)?

Yes. Hainan Airlines fly this route. Flight time is about 11h 28m.

What is the fastest connection from Milan (MXP) to Shenzhen (SZX)?

via Vienna ≈ 11h 58m, via Chongqing ≈ 11h 58m, via Chengdu ≈ 11h 58m (estimated flying time, excluding layovers).

from 25,000 ANA miles, from 37,000 JAL miles (economy, one way, based on the published award charts).

Milan Malpensa International Airport (MXP) to Shenzhen Bao'an International Airport (SZX)・9,323 km

Nonstop flights available (1 airline). Flight time about 11h 28m. Nonstop return flights also operate.

With milesANA 25,000 miles+ (via HND)JAL 37,000 miles+ (via XIY)Economy, one way, estimate. Tap a connection for miles by cabin.

30 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.