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

Return flights

06 Sep - 13 Sep	Arajet
24 Sep - 30 Sep	Spirit Airlines
06 Sep - 18 Sep	Spirit Airlines
06 Sep - 20 Sep	Spirit Airlines
06 Sep - 08 Sep	Spirit Airlines
20 Sep - 30 Sep	Spirit Airlines
01 Sep - 08 Sep	Arajet
08 Sep - 17 Sep	Arajet
07 Sep - 13 Sep	Spirit Airlines
04 Sep - 10 Sep	Copa
24 Sep - 09 Oct	Spirit Airlines
24 Sep - 10 Oct	Spirit Airlines
20 Sep - 09 Oct	Spirit Airlines
20 Sep - 10 Oct	Spirit Airlines

Also check the deals for one-way flights from Cancun to San Juan in September.

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 Cancun to San Juan in September from $259

Return flights