Cheapest return flights from San Francisco to San Diego in September from $78

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

Return flights

06 Sep - 08 Sep Frontier Airlines direct
20 Sep - 26 Sep Frontier Airlines direct
11 Sep - 15 Sep Frontier Airlines direct
10 Sep - 13 Sep Alaska Airlines direct
30 Sep - 04 Oct Hawaiian Airlines direct
21 Sep - 25 Sep Alaska Airlines direct
13 Sep - 14 Oct Alaska Airlines direct
28 Sep - 05 Oct Frontier Airlines direct
29 Sep - 03 Oct Frontier Airlines direct
02 Sep - 02 Sep United direct
30 Sep - 02 Oct Alaska Airlines direct
21 Sep - 26 Sep Frontier Airlines direct
04 Sep - 07 Sep Frontier Airlines direct
26 Sep - 28 Sep Frontier Airlines direct
05 Sep - 07 Sep Alaska Airlines direct
28 Sep - 01 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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