Are there nonstop flights from Tehran (IKA) to Tashkent (TAS)?

Yes. Zagros Airlines fly this route. Flight time is about 2h 30m.

What is the fastest connection from Tehran (IKA) to Tashkent (TAS)?

via Dushanbe ≈ 3h 14m, via Baku ≈ 3h 34m, via Kabul ≈ 3h 49m (estimated flying time, excluding layovers).

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

Imam Khomeini International Airport (IKA) to Tashkent International Airport (TAS)・1,705 km

Nonstop flights available (1 airline). Flight time about 2h 30m. Nonstop return flights also operate.

With milesJAL 23,000 miles+ (via DOH)Economy, one way, estimate. Tap a connection for miles by cabin.

17 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.