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

Return flights

10 Sep - 17 Sep	Ryanair
15 Sep - 17 Sep	Wizz Air Malta
17 Sep - 24 Sep	Ryanair
03 Sep - 10 Sep	Air Serbia
03 Sep - 24 Sep	Air Serbia
22 Sep - 30 Sep	Wizz Air Malta
01 Sep - 24 Sep	Wizz Air Malta
10 Sep - 24 Sep	Ryanair
08 Sep - 17 Sep	Wizz Air Malta
06 Sep - 13 Sep	Air Serbia
30 Sep - 08 Oct	SWISS
05 Sep - 11 Oct	Air Serbia
04 Sep - 11 Oct	Air Serbia
04 Sep - 10 Oct	Air Serbia
30 Sep - 06 Oct	Norwegian
25 Sep - 08 Oct	Ryanair
22 Sep - 05 Oct	Wizz Air Malta
26 Sep - 04 Oct	Wizz Air Malta
22 Sep - 13 Oct	Vueling Airlines
24 Sep - 13 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 136€

Return flights