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

AirHint found the following cheapest return flights from San Francisco (SFO) to San Diego (SAN) in September 2025 (see full year).

Return flights

29 Sep - 02 Oct Alaska Airlines direct
30 Sep - 30 Sep United direct
13 Sep - 20 Sep Frontier Airlines direct
25 Sep - 02 Oct Alaska Airlines direct
29 Sep - 30 Sep Southwest Airlines direct
29 Sep - 29 Sep Southwest Airlines direct
28 Sep - 02 Oct Hawaiian Airlines direct
20 Sep - 22 Sep Frontier Airlines direct
25 Sep - 27 Sep Alaska Airlines direct
27 Sep - 29 Sep Frontier Airlines direct
23 Sep - 25 Sep Alaska Airlines direct
22 Sep - 24 Sep Alaska Airlines direct
28 Sep - 29 Sep Alaska Airlines direct
17 Sep - 01 Oct Alaska Airlines direct
30 Sep - 02 Oct Alaska Airlines direct
18 Sep - 01 Oct Alaska Airlines direct
30 Sep - 13 Oct Alaska Airlines
26 Sep - 03 Oct United direct
13 Sep - 14 Oct Southwest Airlines direct
30 Sep - 13 Oct Alaska Airlines direct

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

Skyscanner

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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