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

Return flights

05 Aug - 09 Aug	Spirit Airlines
04 Aug - 07 Aug	Spirit Airlines
02 Aug - 09 Aug	Spirit Airlines
09 Aug - 11 Aug	Spirit Airlines
01 Aug - 06 Aug	Spirit Airlines
08 Aug - 12 Aug	Spirit Airlines
06 Aug - 13 Aug	Frontier Airlines
05 Aug - 12 Aug	Spirit Airlines
03 Aug - 06 Aug	Spirit Airlines
07 Aug - 12 Aug	Spirit Airlines
29 Aug - 01 Sep	Spirit Airlines
28 Aug - 01 Sep	Spirit Airlines
29 Aug - 02 Sep	American Airlines
27 Aug - 02 Sep	Sun Country 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.

Book a cheap hotel in San Juan

Cheap car rent in San Juan

Cheapest return flights from Phoenix to San Juan in August from $240

Return flights