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

Return flights

01 Oct - 14 Oct	Air Canada
20 Oct - 27 Oct	Air Canada
08 Oct - 15 Oct	United
09 Oct - 16 Oct	Air Canada
13 Oct - 20 Oct	United
03 Oct - 10 Oct	United
09 Oct - 15 Oct	British Airways
23 Oct - 30 Oct	United
28 Oct - 04 Nov	United
18 Oct - 25 Oct	United
30 Oct - 08 Nov	Air Canada
20 Oct - 25 Oct	Alaska 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.

Book a cheap hotel in Barcelona

Cheap car rent in Barcelona

Cheapest return flights from San Diego to Barcelona in October from $568

Return flights