AirHint found the following cheapest return flights from Raleigh-durham (RDU) to Barcelona (BCN) in September 2025 (see full year).

Return flights

06 Sep - 13 Sep	Frontier Airlines
30 Sep - 07 Oct	United
24 Sep - 01 Oct	United
24 Sep - 08 Oct	Air Canada
09 Sep - 16 Sep	Air Canada
10 Sep - 17 Sep	Air Canada
03 Sep - 10 Sep	United
09 Sep - 15 Sep	British Airways
15 Sep - 22 Sep	United
01 Sep - 08 Sep	United
11 Sep - 18 Sep	United
27 Sep - 04 Oct	United
19 Sep - 26 Sep	United
17 Sep - 24 Sep	United

Also check the deals for one-way flights from Raleigh-durham 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 Raleigh-durham to Barcelona in September from 399€

Return flights