Kristiansand Airport Kjevik lies 66 kilometres from Arendal. The Airport Coach takes you to/from the airport and Arendal.
Sandefjord Airport Torp: Take a taxi from Torp Airport Sandefjord to the bus stop Fokserød by the E18, where there are a bus connections with either Lavprisekspressen or Vy express to Arendal.
Vy offers several train departures between Oslo / Arendal / Kristiansand every day.
Vy express (Kristiansand and Oslo) have departures to and from Oslo/Kristiansand many times a day with VY190. The bus stops by the E18, and there are bus connections from this main road to Arendal center. Tickets can be bought on the bus or at Vy/nettbuss.no.