Are there nonstop flights from Hanoi (HAN) to Jakarta (CGK)?

Yes. VietJet Air, Vietnam Airlines fly this route. Flight time is about 4h 5m.

What is the fastest connection from Hanoi (HAN) to Jakarta (CGK)?

via Ho Chi Minh City ≈ 4h 35m, via Phnom Penh ≈ 4h 36m, via Singapore ≈ 4h 39m (estimated flying time, excluding layovers).

from 15,000 ANA miles, from 23,000 JAL miles (economy, one way, based on the published award charts).

Noi Bai International Airport (HAN) to Soekarno-Hatta International Airport (CGK)・3,042 km

Nonstop flights available (2 airlines). Flight time about 4h 5m. Nonstop return flights also operate.

With milesANA 15,000 miles+ (via SIN)JAL 23,000 miles+ (via KUL)Economy, one way, estimate. Tap a connection for miles by cabin.

23 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.