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

Return flights

16 Sep - 23 Sep	Iberia For Level	direct
16 Sep - 02 Oct	Iberia For Level	direct
16 Sep - 23 Oct	Iberia For Level	direct
23 Sep - 02 Oct	Iberia For Level	direct
23 Sep - 30 Sep	Iberia For Level	direct
16 Sep - 30 Sep	Iberia For Level	direct
27 Sep - 18 Oct	Iberia For Level	direct
01 Sep - 09 Sep	TAP
03 Sep - 17 Sep	TAP
07 Sep - 16 Sep	Vueling Airlines	direct
11 Sep - 18 Sep	TAP
22 Sep - 07 Oct	Air Canada
30 Sep - 07 Oct	Iberia
30 Sep - 07 Oct	Iberia For Level	direct
24 Sep - 08 Oct	Air Canada
24 Sep - 01 Oct	Air Canada
29 Sep - 14 Oct	Air Canada
20 Sep - 29 Sep	Air Canada
08 Sep - 23 Sep	TAP
15 Sep - 29 Sep	TAP

Also check the deals for one-way flights from San Francisco 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 San Francisco to Barcelona in September from $359

Return flights