AIRPORTS: there best alternative would be arriving from Stavanger (Sola) airport.
--Stavanger (2.5h): you can take the shuttle bus from Sola airport to Stavanger. Then, get the NOR-WAY bus (rute 300) in Stavanger and stop in Lyngdal Rom Terminal.
--Kristiansand (2.5h): you can take the airport bus from Kjevik airport to Kristiansand city. Then, get the local AKT bus (A) in Kristiansand and stop at Lyngdal/Farsund/Borhaug.
--Oslo (7h): there is two airports, Gardemoen and Rygge. You should arrive to Oslo city by bus/train and then get the train in Oslo city and stop in Snartemo (NSB) or the bus and stop in Lyngdal (Rute Nr 191).
Sorry, but we are outside of the spring and autum seasons. Detailed log