Are there nonstop flights from Singapore (SIN) to Changchun (CGQ)?

Yes. Hainan Airlines fly this route. Flight time is about 6h 37m.

What is the fastest connection from Singapore (SIN) to Changchun (CGQ)?

via Guangzhou ≈ 7h 7m, via Hefei ≈ 7h 7m, via Shenzhen ≈ 7h 7m (estimated flying time, excluding layovers).

from 18,000 ANA miles, from 23,000 JAL miles (economy, one way, based on the published award charts).

Singapore Changi Airport (SIN) to Changchun Longjia International Airport (CGQ)・5,203 km

Nonstop flights available (1 airline). Flight time about 6h 37m. Nonstop return flights also operate.

With milesANA 18,000 miles+ (via SZX)JAL 23,000 miles+ (via KHN)Economy, one way, estimate. Tap a connection for miles by cabin.

36 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.