Are there nonstop flights from Tehran (IKA) to Shanghai (SHA)?

No. The fastest connection is via Ürümqi, about 8h 38m of total flying time.

What is the fastest connection from Tehran (IKA) to Shanghai (SHA)?

via Ürümqi ≈ 8h 38m, via Beijing ≈ 8h 51m, via Beijing ≈ 8h 55m (estimated flying time, excluding layovers).

Imam Khomeini International Airport (IKA) to Shanghai Hongqiao International Airport (SHA)・6,400 km

No nonstop flights. The fastest connection is via Ürümqi (URC), about 8h 38m of flying time (layover not included).

None.

5 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.