Lalibela -Gondar is around 380 K/m and the drive may take 7-8hrs. Unfortunately, there is no direct public transportation leaving from Lalibela. The best to do is: drive 60 K/m from Lalibela to Gashena the junction, there switch to a public minivan or other cars to Gondar.
Ethiopian Airline fly every day from Lalibela - Gondar or Gondar -Lalibela, it just 30 minutes.
Lets us know if you need help with booking your flights with the big discount you get from Ethiopian Air, or book a car to any destinations in Ethiopia