Cheapest return flights from Phoenix to San Diego in September from $77

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

Return flights

27 Sep - 29 Sep Alaska Airlines direct
26 Sep - 29 Sep Alaska Airlines direct
26 Sep - 27 Sep Alaska Airlines direct
25 Sep - 29 Sep Frontier Airlines direct
23 Sep - 25 Sep Frontier Airlines direct
24 Sep - 24 Sep Frontier Airlines direct
26 Sep - 28 Sep Alaska Airlines direct
19 Sep - 26 Sep Frontier Airlines direct
20 Sep - 30 Sep Frontier Airlines direct
21 Sep - 28 Sep Frontier Airlines direct

Also check the deals for one-way flights from Phoenix 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.

Book a cheap hotel in San Diego

Cheap car rent in San Diego

Feel free to contact us with any feedback or request another flight research.