Are there nonstop flights from Irkutsk (IKT) to Harbin (HRB)?

Yes. IrAero fly this route. Flight time is about 2h 34m.

What is the fastest connection from Irkutsk (IKT) to Harbin (HRB)?

via Ulaanbaatar ≈ 3h 24m, via Blagoveschensk ≈ 3h 31m, via Beijing ≈ 4h 7m (estimated flying time, excluding layovers).

from 18,000 ANA miles (economy, one way, based on the published award charts).

Irkutsk International Airport (IKT) to Harbin Taiping International Airport (HRB)・1,750 km

Nonstop flights available (1 airline). Flight time about 2h 34m. Nonstop return flights also operate.

With milesANA 18,000 miles+ (via PEK)Economy, one way, estimate. Tap a connection for miles by cabin.

8 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.