Cheapest return flights from Phoenix to San Juan in September from $312

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

Return flights

23 Sep - 27 Sep Frontier Airlines
20 Sep - 26 Sep Frontier Airlines
26 Sep - 29 Sep Spirit Airlines
16 Sep - 19 Sep Frontier Airlines
11 Sep - 17 Sep Frontier Airlines
13 Sep - 21 Sep Frontier Airlines
10 Sep - 15 Sep Frontier Airlines
04 Sep - 08 Sep Frontier Airlines
04 Sep - 07 Sep Frontier Airlines
11 Sep - 15 Sep Southwest Airlines

Also check the deals for one-way flights from Phoenix to San Juan 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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