Cheapest return flights from San Francisco to San Juan in May from $284

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

Return flights

03 May - 06 May Frontier Airlines
02 May - 06 May Frontier Airlines
17 May - 23 May Frontier Airlines
13 May - 19 May Frontier Airlines
10 May - 17 May Frontier Airlines
07 May - 10 May Frontier Airlines
11 May - 14 May Frontier Airlines
16 May - 26 May Frontier Airlines
14 May - 17 May Frontier Airlines
15 May - 24 May Frontier Airlines
30 May - 08 Jun American Airlines
21 May - 08 Jun American Airlines

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

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