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

Return flights

11 Sep - 16 Sep	Norwegian
30 Sep - 07 Oct	Wizz Air Malta
30 Sep - 06 Oct	Wizz Air Malta
11 Sep - 17 Sep	Norwegian
18 Sep - 14 Oct	Norwegian
19 Sep - 22 Sep	Norwegian
06 Sep - 23 Sep	Iberia
18 Sep - 24 Sep	Norwegian
19 Sep - 23 Sep	Norwegian
19 Sep - 21 Sep	Norwegian
17 Sep - 24 Sep	Ryanair
25 Sep - 29 Sep	Wizz Air Malta
11 Sep - 21 Sep	Norwegian
23 Sep - 16 Oct	Wizz Air Malta
25 Sep - 02 Oct	Wizz Air Malta
26 Sep - 06 Oct	Wizz Air Malta
22 Sep - 15 Oct	Wizz Air Malta
30 Sep - 03 Oct	Ryanair
29 Sep - 08 Oct	Iberia
29 Sep - 01 Oct	Wizz Air Malta

Also check the deals for one-way flights from Madrid 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 Madrid to Oslo in September from $137

Return flights