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

Return flights

18 Sep - 21 Sep	Air Serbia
12 Sep - 21 Sep	Wizz Air
29 Sep - 06 Oct	Wizz Air Malta
13 Sep - 21 Sep	Wizz Air
11 Sep - 15 Sep	Wizz Air
15 Sep - 21 Sep	Aegean Airlines	direct
30 Sep - 03 Oct	Aegean Airlines
16 Sep - 21 Sep	Ryanair
03 Sep - 10 Sep	Air Serbia
25 Sep - 02 Oct	Ryanair
03 Sep - 07 Sep	Air Serbia
17 Sep - 24 Sep	Air Serbia
05 Sep - 07 Sep	Air Serbia
23 Sep - 10 Oct	Ryanair
24 Sep - 12 Oct	Norwegian	direct
24 Sep - 13 Oct	Norwegian	direct
29 Sep - 04 Oct	Air France
24 Sep - 08 Oct	Norwegian	direct
24 Sep - 15 Oct	Norwegian	direct
24 Sep - 06 Oct	Norwegian	direct

Also check the deals for one-way flights from Athens to Oslo 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 Athens to Oslo in September from 128€

Return flights