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

Return flights

18 May - 27 May	Avianca
01 May - 09 May	Avianca
19 May - 28 May	Avianca
14 May - 21 May	Iberia	direct
12 May - 26 May	Iberia	direct
04 May - 17 May	British Airways
04 May - 24 May	Iberia
20 May - 31 May	Avianca
18 May - 31 May	Avianca
30 May - 13 Jun	Avianca
28 May - 07 Jun	Avianca
01 May - 09 May	Iberia	direct
31 May - 12 Jun	Air France
31 May - 12 Jun	Iberia	direct

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.

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Cheapest return flights from Madrid to San Juan in May from 549€

Return flights