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

Return flights

07 Oct - 22 Oct	Lufthansa
08 Oct - 22 Oct	Lufthansa
07 Oct - 16 Oct	Lufthansa
15 Oct - 23 Oct	SWISS
08 Oct - 17 Oct	Lufthansa
07 Oct - 23 Oct	British Airways
27 Oct - 12 Nov	Delta
08 Oct - 15 Oct	SWISS
08 Oct - 13 Oct	Aer Lingus
01 Oct - 07 Oct	Aer Lingus
27 Oct - 22 Nov	Scandinavian Airlines
28 Oct - 22 Nov	Scandinavian Airlines
14 Oct - 30 Oct	Lufthansa
28 Oct - 11 Nov	Air Canada
21 Oct - 15 Nov	Scandinavian Airlines
15 Oct - 04 Nov	TAP
18 Oct - 08 Nov	Iberia
23 Oct - 15 Nov	Iberia
15 Oct - 08 Nov	SWISS
22 Oct - 15 Nov	Lufthansa

Also check the deals for one-way flights from San Francisco 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 San Francisco to Barcelona in October from 363€

Return flights