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

Return flights

10 Sep - 11 Sep	Ryanair
08 Sep - 10 Sep	Ryanair
22 Sep - 30 Sep	Ryanair
21 Sep - 19 Oct	Air Serbia
19 Sep - 24 Sep	Wizz Air
22 Sep - 25 Sep	Ryanair
24 Sep - 01 Oct	Air Serbia
18 Sep - 24 Sep	Wizz Air Malta
20 Sep - 10 Oct	Ryanair
21 Sep - 25 Sep	Air Serbia
10 Sep - 16 Sep	Ryanair
21 Sep - 24 Sep	Air Serbia
17 Sep - 20 Sep	Air Serbia
30 Sep - 08 Oct	Ryanair
24 Sep - 07 Oct	Ryanair
24 Sep - 03 Oct	Air Serbia
23 Sep - 01 Oct	Norwegian
22 Sep - 07 Oct	Ryanair
24 Sep - 02 Oct	Ryanair
27 Sep - 09 Oct	Ryanair

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