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

Return flights

30 Sep - 08 Oct	Ryanair
30 Sep - 03 Oct	Ryanair
17 Sep - 20 Sep	Volotea
10 Sep - 14 Sep	Ryanair
17 Sep - 22 Sep	Volotea
17 Sep - 24 Sep	Volotea
10 Sep - 20 Sep	Volotea
10 Sep - 15 Sep	Ryanair
17 Sep - 21 Sep	Volotea
04 Sep - 10 Sep	Air Serbia
30 Sep - 04 Oct	Ryanair
18 Sep - 21 Sep	Air Serbia
18 Sep - 22 Sep	Air Serbia
23 Sep - 06 Oct	Ryanair
29 Sep - 15 Oct	Ryanair
23 Sep - 01 Oct	Ryanair
26 Sep - 12 Oct	Aegean Airlines
24 Sep - 13 Oct	Norwegian	direct
20 Sep - 05 Oct	Air Serbia
26 Sep - 05 Oct	Transavia France

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.

Book a cheap hotel in Oslo

Cheap car rent in Oslo

Cheapest return flights from Athens to Oslo in September from $151

Return flights