AirHint found the following cheapest return flights from Kristiansand (KRS) to Sofia (SOF) in September 2025 (see full year).

Return flights

10 Sep - 14 Sep	Norwegian
14 Sep - 18 Sep	Scandinavian Airlines
10 Sep - 15 Sep	Norwegian
09 Sep - 14 Sep	Norwegian
11 Sep - 15 Sep	Norwegian
09 Sep - 13 Sep	Norwegian
08 Sep - 12 Sep	Norwegian
08 Sep - 13 Sep	Norwegian
12 Sep - 16 Sep	Scandinavian Airlines
14 Sep - 20 Sep	Scandinavian Airlines

Also check the deals for one-way flights from Kristiansand to Sofia in September.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

Book a cheap hotel in Sofia

Cheap car rent in Sofia

Cheapest return flights from Kristiansand to Sofia in September from $262

Return flights