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

Return flights

21 May - 26 May	TAP
11 May - 25 May	Scandinavian Airlines
21 May - 31 May	TAP
21 May - 30 May	TAP
01 May - 08 May	United	direct
13 May - 24 May	British Airways
21 May - 30 May	Iberia	direct
21 May - 31 May	Iberia	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 $474

Return flights