Cheapest return SFO–SAN flights, May

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

Return flights

31 May - 03 Jun Frontier Airlines direct
30 May - 03 Jun Frontier Airlines direct
30 May - 01 Jun Frontier Airlines direct
30 May - 30 May Alaska Airlines direct
26 May - 30 May Frontier Airlines direct
27 May - 30 May Frontier Airlines direct
26 May - 02 Jun Frontier Airlines direct
28 May - 01 Jun Frontier Airlines direct
29 May - 30 May Frontier Airlines direct
29 May - 02 Jun Frontier Airlines direct
29 May - 03 Jun Frontier Airlines direct
27 May - 01 Jun Frontier Airlines direct
29 May - 01 Jun Frontier Airlines direct
26 May - 27 May Frontier Airlines direct
13 May - 04 Jun Frontier Airlines direct
30 May - 31 May Frontier Airlines direct
27 May - 28 May Frontier Airlines direct
27 May - 29 May Frontier Airlines direct
26 May - 29 May Frontier Airlines direct
13 May - 27 May Frontier Airlines direct

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

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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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