Are there nonstop flights from Changzhou (CZX) to Haiphong (HPH)?

No. The fastest connection is via Nanning, about 3h 7m of total flying time.

What is the fastest connection from Changzhou (CZX) to Haiphong (HPH)?

via Nanning ≈ 3h 7m, via Guangzhou ≈ 3h 13m, via Shenzhen ≈ 3h 18m (estimated flying time, excluding layovers).

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

Changzhou Benniu International Airport (CZX) to Cat Bi International Airport (HPH)・1,790 km

No nonstop flights. The fastest connection is via Nanning (NNG), about 3h 7m of flying time (layover not included).

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

None.

6 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.