Cheapest return flights from San Francisco to San Diego in May from $71

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

Return flights

07 May - 14 May Frontier Airlines direct
03 May - 07 May Frontier Airlines direct
05 May - 12 May Alaska Airlines direct
11 May - 20 May Frontier Airlines direct
14 May - 21 May Frontier Airlines direct
16 May - 20 May Southwest Airlines
14 May - 14 May Frontier Airlines direct
01 May - 04 May Frontier Airlines direct
24 May - 25 May Frontier Airlines direct
29 May - 31 May Frontier Airlines direct

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

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