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

Return flights

05 Oct - 10 Oct	Icelandair
17 Oct - 24 Oct	Icelandair
19 Oct - 24 Oct	Icelandair
18 Oct - 24 Oct	Icelandair
15 Oct - 25 Oct	Icelandair
16 Oct - 25 Oct	Icelandair
26 Oct - 04 Nov	Icelandair
10 Oct - 22 Oct	Icelandair
26 Oct - 10 Nov	Air Canada
10 Oct - 24 Oct	Icelandair
06 Oct - 10 Oct	United	direct
26 Oct - 31 Oct	Air Canada
27 Oct - 27 Nov	United
23 Oct - 02 Nov	Scandinavian Airlines
26 Oct - 15 Nov	Air Canada
13 Oct - 08 Nov	Air Canada
29 Oct - 03 Nov	Air Canada
20 Oct - 15 Nov	Aer Lingus
16 Oct - 13 Nov	Aer Lingus
23 Oct - 01 Nov	Air Canada

Also check the deals for one-way flights from Washington to Barcelona in October.

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 October from $364

Return flights