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

One-Way flights

20 Sep	Vueling Airlines	direct
17 Sep	Vueling Airlines	direct
22 Sep	Vueling Airlines	direct
10 Sep	Ryanair
21 Sep	Norwegian Air Sweden AOC	direct
24 Sep	Vueling Airlines	direct
03 Sep	Ryanair
18 Sep	Wizz Air
16 Sep	Wizz Air
23 Sep	Wizz Air

Also check the deals for return 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 one-way flights from Oslo to Barcelona in September from 50€

One-Way flights