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

Return flights

03 Sep - 12 Sep	Air Serbia
07 Sep - 13 Sep	Air Serbia
25 Sep - 01 Oct	Air Serbia
20 Sep - 25 Sep	Norwegian
24 Sep - 04 Oct	Air Serbia
05 Sep - 07 Sep	Norwegian	direct
05 Sep - 25 Sep	Norwegian
05 Sep - 12 Sep	Norwegian	direct
07 Sep - 25 Sep	Norwegian
07 Sep - 12 Sep	Norwegian	direct
05 Sep - 13 Sep	Norwegian	direct
07 Sep - 13 Sep	Norwegian	direct
20 Sep - 04 Oct	Norwegian	direct
24 Sep - 12 Oct	Norwegian Air Sweden AOC
15 Sep - 04 Oct	Norwegian

Also check the deals for one-way flights from Oslo to Athens 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.

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Cheapest return flights from Oslo to Athens in September from 174€

Return flights