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

Return flights

01 Aug - 06 Aug	Frontier Airlines
02 Aug - 06 Aug	Spirit Airlines
02 Aug - 09 Aug	Spirit Airlines
02 Aug - 05 Aug	Frontier Airlines
07 Aug - 12 Aug	Spirit Airlines
06 Aug - 07 Aug	Frontier Airlines
12 Aug - 17 Aug	Southwest Airlines
30 Aug - 09 Sep	United
29 Aug - 03 Sep	United
19 Aug - 26 Aug	Southwest Airlines
05 Aug - 12 Aug	Southwest Airlines
27 Aug - 02 Sep	Southwest Airlines
20 Aug - 26 Aug	Southwest Airlines
30 Aug - 08 Sep	United
28 Aug - 03 Sep	Southwest Airlines

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

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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Cheapest return flights from Phoenix to San Juan in August from 259€

Return flights