Are there nonstop flights from Tainan (TNN) to Hanoi (HAN)?

Yes. VietJet Air fly this route. Flight time is about 2h 16m.

Tainan → Hanoi

Tainan International Airport / Tainan Air Base (TNN) to Noi Bai International Airport (HAN)・1,495 km

Nonstop flights available (1 airline). Flight time about 2h 16m. Nonstop return flights also operate.

Times are estimated from distance. Check schedules, frequency and availability with the airline or a booking site.