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

Return flights

22 Sep - 01 Oct	Air France
24 Sep - 01 Oct	Delta
30 Sep - 25 Oct	Air Canada
20 Sep - 03 Oct	British Airways
24 Sep - 06 Oct	Air Canada
29 Sep - 14 Oct	Air Canada
17 Sep - 23 Sep	Delta
25 Sep - 04 Oct	British Airways
17 Sep - 29 Sep	Delta
26 Sep - 30 Sep	Delta
20 Sep - 11 Oct	British Airways
22 Sep - 29 Sep	Air Canada
23 Sep - 18 Oct	Air Canada
24 Sep - 18 Oct	Air Canada
14 Sep - 18 Sep	Scandinavian Airlines
18 Sep - 21 Sep	Air Canada
15 Sep - 28 Sep	Air Canada
18 Sep - 25 Sep	British Airways
13 Sep - 19 Sep	Icelandair
14 Sep - 19 Sep	Icelandair

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 404€

Return flights