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
02 May - 17 May	Scandinavian Airlines
14 May - 18 May	Scandinavian Airlines
19 May - 26 May	Air Canada
13 May - 27 May	British Airways
18 May - 26 May	British Airways
11 May - 25 May	Scandinavian Airlines
19 May - 26 May	Finnair	direct
12 May - 19 May	Iberia	direct
14 May - 20 May	Scandinavian Airlines
11 May - 23 Jun	Air Canada
30 May - 06 Jun	Air Canada
29 May - 05 Jun	Air Canada

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 $428

Return flights