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

Return flights

05 May - 12 May	Iberia	direct
06 May - 20 May	British Airways
21 May - 02 Jun	SWISS
15 May - 22 May	TAP
21 May - 02 Jun	British Airways	direct
21 May - 31 May	TAP
29 May - 05 Jun	TAP
22 May - 25 May	TAP
30 May - 06 Jun	TAP
29 May - 06 Jun	TAP
23 May - 26 May	Scandinavian Airlines
25 May - 01 Jun	Iberia
23 May - 26 May	British Airways	direct

Also check the deals for one-way flights from San Francisco to Madrid 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 Madrid in May from $513

Return flights