Cheapest return flights from Keflavik to Oslo in September from $143

AirHint found the following cheapest return flights from Keflavik (KEF) to Oslo (OSL) in September 2026 (see full year).

Return flights

29 Sep - 18 Oct Norwegian direct
01 Sep - 06 Sep Norwegian direct
22 Sep - 29 Sep Norwegian direct
15 Sep - 29 Sep Norwegian direct
10 Sep - 15 Sep Norwegian direct
10 Sep - 13 Sep Norwegian direct
01 Sep - 15 Sep Norwegian direct
01 Sep - 13 Sep Norwegian direct
10 Sep - 29 Sep Norwegian direct
01 Sep - 10 Sep Norwegian direct
15 Sep - 18 Sep Scandinavian Airlines
29 Sep - 02 Oct Scandinavian Airlines direct
30 Sep - 03 Oct Scandinavian Airlines direct
28 Sep - 01 Oct Scandinavian Airlines direct

Also check the deals for one-way flights from Keflavik to Oslo in September.

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