AirHint found the following cheapest return flights from Oslo (OSL) to Athens (ATH) in September 2025 (see full year).

Return flights

14 Sep - 19 Sep	Air Serbia
14 Sep - 20 Sep	Air Serbia
05 Sep - 12 Sep	Air Serbia
14 Sep - 22 Sep	Air Serbia
15 Sep - 19 Sep	Air Serbia
21 Sep - 29 Sep	Air Serbia
06 Sep - 09 Sep	Air Serbia
12 Sep - 19 Sep	Air Serbia
05 Sep - 08 Sep	Air Serbia
02 Sep - 01 Oct	Ryanair
25 Sep - 27 Sep	Ryanair
28 Sep - 05 Oct	Air Serbia
29 Sep - 06 Oct	Air Serbia
23 Sep - 01 Oct	Norwegian Air Sweden AOC
26 Sep - 05 Oct	transavia
27 Sep - 04 Oct	SWISS
14 Sep - 01 Oct	Norwegian
23 Sep - 13 Oct	Norwegian Air Sweden AOC
23 Sep - 08 Oct	Norwegian Air Sweden AOC
24 Sep - 01 Oct	Vueling Airlines

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 $192

Return flights