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

Return flights

23 Sep - 30 Sep	Air Canada
30 Sep - 07 Oct	Air Canada
24 Sep - 01 Oct	Air Canada
11 Sep - 23 Sep	Iberia
01 Sep - 08 Sep	British Airways
08 Sep - 15 Sep	British Airways
09 Sep - 16 Sep	British Airways
11 Sep - 18 Sep	British Airways
17 Sep - 24 Sep	Air Canada
18 Sep - 25 Sep	Air Canada
25 Sep - 02 Oct	Air Canada
26 Sep - 03 Oct	Air Canada
02 Sep - 09 Sep	Air Canada
11 Sep - 25 Sep	British Airways
29 Sep - 06 Oct	Finnair
27 Sep - 04 Oct	Air Canada
26 Sep - 01 Oct	Air Canada
26 Sep - 02 Oct	Air Canada
28 Sep - 05 Oct	Air Canada

Also check the deals for one-way flights from Washington 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 Washington to Barcelona in September from 372€

Return flights