Cheapest return flights from San Francisco to San Diego in September from $73

Best time to book flights for San Francisco (SFO) to San Diego (SAN) flights at AirHint

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

Return flights

13 Sep - 15 Sep Frontier Airlines direct
15 Sep - 19 Sep Frontier Airlines direct
11 Sep - 29 Sep Frontier Airlines direct
20 Sep - 27 Sep Frontier Airlines direct
09 Sep - 15 Sep Alaska Airlines direct
26 Sep - 28 Sep Alaska Airlines direct
12 Sep - 14 Sep Alaska Airlines direct
19 Sep - 21 Sep Alaska Airlines direct
07 Sep - 11 Sep Frontier Airlines direct
26 Sep - 03 Oct Frontier Airlines direct
10 Sep - 17 Sep Alaska Airlines direct

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

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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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