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

Return flights

03 May - 12 May	Iberia	direct
05 May - 12 May	Iberia	direct
05 May - 19 May	LEVEL	direct
01 May - 13 May	TAP
09 May - 18 May	TAP
07 May - 18 May	TAP
08 May - 18 May	TAP
14 May - 28 May	TAP
06 May - 13 May	ITA Airways
01 May - 01 Jun	TAP
01 May - 16 May	Scandinavian Airlines
25 May - 01 Jun	Scandinavian Airlines
27 May - 03 Jun	WestJet
26 May - 02 Jun	Scandinavian Airlines
28 May - 08 Jun	TAP
20 May - 13 Jun	SWISS
26 May - 09 Jun	Lufthansa
20 May - 03 Jun	Brussels Airlines
26 May - 02 Jun	American Airlines	direct
27 May - 03 Jun	United	direct

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 365€

Return flights