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

Return flights

08 Sep - 13 Sep	Ryanair
09 Sep - 13 Sep	Ryanair
09 Sep - 18 Sep	Ryanair
16 Sep - 24 Sep	Ryanair
10 Sep - 13 Sep	Ryanair
10 Sep - 15 Sep	Ryanair
13 Sep - 17 Sep	Vueling Airlines	direct
22 Sep - 26 Sep	Ryanair
08 Sep - 11 Sep	Ryanair
20 Sep - 25 Sep	Ryanair
30 Sep - 13 Oct	Wizz Air
30 Sep - 05 Oct	easyJet
30 Sep - 03 Oct	Ryanair
27 Sep - 01 Oct	Ryanair
29 Sep - 02 Oct	Wizz Air
24 Sep - 01 Oct	Ryanair
30 Sep - 07 Oct	Wizz Air
27 Sep - 02 Oct	Ryanair
30 Sep - 02 Oct	Ryanair
29 Sep - 03 Oct	Ryanair

Also check the deals for one-way flights from Oslo to Barcelona 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 Barcelona in September from $142

Return flights