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

Return flights

08 May - 14 May	jetBlue
10 May - 16 May	jetBlue
09 May - 16 May	jetBlue
07 May - 11 May	Avianca
04 May - 11 May	Avianca
04 May - 12 May	Avianca
11 May - 17 May	Avianca
11 May - 16 May	Avianca
05 May - 12 May	Lufthansa
06 May - 13 May	Lufthansa
21 May - 04 Jun	United
27 May - 09 Jun	United
23 May - 04 Jun	United
21 May - 04 Jun	Iberia	direct
23 May - 01 Jun	British Airways
27 May - 02 Jun	Iberia
23 May - 06 Jun	Iberia
30 May - 08 Jun	United
31 May - 06 Jun	TAP
30 May - 06 Jun	TAP

Also check the deals for one-way flights from Madrid to San Juan 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 San Juan

Cheap car rent in San Juan

Cheapest return flights from Madrid to San Juan in May from 456€

Return flights