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

Return flights

16 Oct - 30 Oct	Spirit Airlines
15 Oct - 22 Oct	United
13 Oct - 22 Oct	Air Canada
06 Oct - 23 Oct	United
01 Oct - 22 Oct	United
03 Oct - 10 Oct	United
09 Oct - 16 Oct	United
24 Oct - 31 Oct	United
17 Oct - 01 Nov	Hawaiian Airlines
06 Oct - 13 Oct	United
12 Oct - 19 Oct	United
29 Oct - 05 Nov	United
24 Oct - 02 Nov	Frontier Airlines

Also check the deals for one-way flights from San Diego 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 Diego to Barcelona in October from 483€

Return flights