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

Return flights

22 Sep - 25 Sep	Ryanair
24 Sep - 01 Oct	Ryanair
21 Sep - 30 Sep	Norwegian
24 Sep - 30 Sep	Air Serbia
17 Sep - 19 Sep	Air Serbia
15 Sep - 24 Sep	Ryanair
22 Sep - 07 Oct	Ryanair
30 Sep - 08 Oct	Ryanair
30 Sep - 10 Oct	Ryanair
28 Sep - 30 Sep	Wizz Air
30 Sep - 07 Oct	Ryanair
18 Sep - 25 Sep	Ryanair
16 Sep - 19 Sep	Wizz Air
19 Sep - 26 Sep	Air Serbia
15 Sep - 16 Sep	Ryanair
30 Sep - 06 Oct	Ryanair
24 Sep - 02 Oct	Air Serbia
29 Sep - 07 Oct	Wizz Air
25 Sep - 08 Oct	Ryanair
26 Sep - 01 Oct	Wizz Air Malta

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 184€

Return flights