Are there nonstop flights from Kigali (KGL) to Douala (DLA)?

Yes. RwandAir fly this route. Flight time is about 3h 17m.

What is the fastest connection from Kigali (KGL) to Douala (DLA)?

via Bangui ≈ 3h 53m, via Libreville ≈ 4h 12m, via Brazzaville ≈ 4h 16m (estimated flying time, excluding layovers).

from 17,500 ANA miles (economy, one way, based on the published award charts).

Kigali International Airport (KGL) to Douala International Airport (DLA)・2,364 km

Nonstop flights available (1 airline). Flight time about 3h 17m. Nonstop return flights also operate.

With milesANA 17,500 miles+ (via ADD)Economy, one way, estimate. Tap a connection for miles by cabin.

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.