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

Return flights

15 Oct - 21 Oct	Frontier Airlines
17 Oct - 21 Oct	Frontier Airlines
13 Oct - 16 Oct	Frontier Airlines
03 Oct - 06 Oct	Frontier Airlines
03 Oct - 07 Oct	Frontier Airlines
23 Oct - 02 Nov	Spirit Airlines
02 Oct - 07 Oct	Frontier Airlines
03 Oct - 10 Oct	Spirit Airlines
01 Oct - 07 Oct	Frontier Airlines
08 Oct - 11 Oct	Frontier Airlines
06 Oct - 09 Oct	Spirit Airlines
25 Oct - 24 Nov	Frontier Airlines

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

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 October from 242€

Return flights