Cheapest one-way flights from Phoenix to San Diego in September from $28

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

One-Way flights

30 Sep Alaska Airlines direct
26 Sep Alaska Airlines direct
28 Sep Alaska Airlines direct
27 Sep Alaska Airlines direct
21 Sep Frontier Airlines direct
22 Sep Frontier Airlines direct
14 Sep Frontier Airlines direct
18 Sep Frontier Airlines direct
17 Sep Frontier Airlines direct
05 Sep Frontier Airlines direct

Also check the deals for return 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.

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