Cheapest return flights from San Diego to San Francisco in May from $56

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

Return flights

14 May - 15 May Frontier Airlines direct
07 May - 10 May Frontier Airlines direct
14 May - 19 May Southwest Airlines direct
13 May - 20 May Alaska Airlines direct
12 May - 18 May Alaska Airlines direct
16 May - 18 May United direct
15 May - 18 May Frontier Airlines direct
14 May - 18 May Southwest Airlines direct
14 May - 31 May Frontier Airlines direct
09 May - 10 May Southwest Airlines direct

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

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