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

Return flights

05 May - 05 Jun	Air Canada
11 May - 18 May	KLM
07 May - 21 May	KLM
09 May - 24 May	Lufthansa
20 May - 26 May	Air Canada
09 May - 17 May	KLM
09 May - 23 May	KLM
07 May - 11 Jun	United
05 May - 16 May	Delta
08 May - 23 May	Air Canada
01 May - 10 May	Air Canada
16 May - 23 May	Delta
26 May - 02 Jun	Iberia
27 May - 09 Jun	Finnair
31 May - 06 Jun	Air Canada
24 May - 07 Jun	Lufthansa
30 May - 07 Jun	Air Canada
29 May - 13 Jun	Lufthansa
30 May - 13 Jun	Lufthansa
30 May - 14 Jun	Alaska Airlines

Also check the deals for one-way flights from San Diego 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.

Book a cheap hotel in Madrid

Cheap car rent in Madrid

Cheapest return flights from San Diego to Madrid in May from $612

Return flights