AirHint found the following cheapest return flights from San Francisco (SFO) to Barcelona (BCN) in May 2026 (see full year).

Return flights

05 May - 10 May	Scandinavian Airlines
05 May - 12 May	ITA Airways
05 May - 15 May	TAP
08 May - 15 May	TAP
05 May - 21 May	TAP
18 May - 25 May	Scandinavian Airlines
01 May - 06 May	TAP
11 May - 18 May	Scandinavian Airlines
01 May - 08 May	TAP
12 May - 19 May	LEVEL	direct
20 May - 03 Jun	Lufthansa
01 May - 01 Jun	ITA Airways
25 May - 01 Jun	SWISS
15 May - 06 Jun	ITA Airways
01 May - 01 Jun	Lufthansa	direct
25 May - 08 Jun	United	direct
25 May - 01 Jun	United	direct
30 May - 14 Jun	Air Canada
28 May - 09 Jun	Lufthansa	direct
29 May - 12 Jun	Air France

Also check the deals for one-way flights from San Francisco to Barcelona in May.

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 May from $479

Return flights