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

Return flights

30 Sep - 02 Oct	Ryanair
23 Sep - 25 Sep	Ryanair
22 Sep - 25 Sep	Ryanair
16 Sep - 18 Sep	Ryanair
25 Sep - 29 Sep	Ryanair
23 Sep - 27 Sep	Ryanair
09 Sep - 16 Sep	Ryanair
26 Sep - 29 Sep	Ryanair
09 Sep - 15 Sep	Ryanair
16 Sep - 22 Sep	Ryanair
22 Sep - 27 Sep	Ryanair
29 Sep - 02 Oct	Ryanair
29 Sep - 01 Oct	Ryanair

Also check the deals for one-way flights from Rome 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 Rome to Barcelona in September from 137€

Return flights