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

Return flights

10 Sep - 17 Sep	Ryanair
17 Sep - 24 Sep	Volotea
17 Sep - 20 Sep	Volotea
13 Sep - 16 Sep	SKY express
11 Sep - 15 Sep	Jet2
18 Sep - 22 Sep	easyJet
24 Sep - 28 Sep	Turkish Airlines
10 Sep - 20 Sep	Wizz Air
20 Sep - 22 Sep	Air Serbia
15 Sep - 17 Sep	Pegasus Airlines
19 Sep - 07 Oct	Air Serbia
30 Sep - 06 Oct	Ryanair
30 Sep - 03 Oct	Ryanair
22 Sep - 07 Oct	Pegasus Airlines
17 Sep - 08 Oct	Norwegian	direct
29 Sep - 04 Oct	Ryanair
29 Sep - 10 Oct	Pegasus Airlines
24 Sep - 12 Oct	Norwegian	direct
24 Sep - 13 Oct	Norwegian	direct
17 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 169€

Return flights