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

Return flights

01 May - 08 May	TAP
01 May - 11 May	TAP
12 May - 26 May	TAP
08 May - 22 May	TAP
02 May - 12 May	TAP
02 May - 09 May	TAP
08 May - 30 May	TAP
11 May - 25 May	Scandinavian Airlines
12 May - 26 May	Finnair	direct
09 May - 23 May	TAP
18 May - 13 Jun	Air Canada
21 May - 05 Jun	British Airways
15 May - 06 Jun	British Airways
21 May - 06 Jun	British Airways
22 May - 05 Jun	TAP
22 May - 06 Jun	TAP
26 May - 20 Jun	TAP
26 May - 20 Jun	Finnair	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 302€

Return flights