Are there nonstop flights from Dongying (DOY) to Shenzhen (SZX)?

Yes. Spring Airlines fly this route. Flight time is about 2h 31m.

What is the fastest connection from Dongying (DOY) to Shenzhen (SZX)?

via Wuhan ≈ 3h 5m, via Quzhou ≈ 3h 8m, via Zhengzhou ≈ 3h 12m (estimated flying time, excluding layovers).

from 10,000 ANA miles, from 15,000 JAL miles (economy, one way, based on the published award charts).

Dongying Shengli Airport (DOY) to Shenzhen Bao'an International Airport (SZX)・1,720 km

Nonstop flights available (1 airline). Flight time about 2h 31m. Nonstop return flights also operate.

With milesANA 10,000 miles+ (via TFU)JAL 15,000 miles+ (via WUH)Economy, one way, estimate. Tap a connection for miles by cabin.

18 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.