Cheapest return flights from San Francisco to San Juan in May from 274€

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

Return flights

02 May - 06 May Frontier Airlines
01 May - 05 May United
07 May - 11 May Frontier Airlines
24 May - 02 Jun United
26 May - 02 Jun United
13 May - 23 May United
12 May - 17 May Frontier Airlines
01 May - 04 May Frontier Airlines
08 May - 11 May Frontier Airlines
23 May - 30 May United
29 May - 01 Jun United
20 May - 24 May Southwest Airlines
22 May - 27 May United

Also check the deals for one-way flights from San Francisco to San Juan in May.

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