Are there nonstop flights from Shenzhen (SZX) to Tehran (IKA)?

Yes. Mahan Air fly this route. Flight time is about 7h 44m.

What is the fastest connection from Shenzhen (SZX) to Tehran (IKA)?

via Ürümqi ≈ 8h 45m, via Dubai ≈ 9h 21m, via Bangkok ≈ 9h 28m (estimated flying time, excluding layovers).

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

Shenzhen Bao'an International Airport (SZX) to Imam Khomeini International Airport (IKA)・6,154 km

Nonstop flights available (1 airline). Flight time about 7h 44m. Nonstop return flights also operate.

With milesJAL 37,000 miles+ (via DXB)Economy, one way, estimate. Tap a connection for miles by cabin.

11 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.