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

Return flights

29 Sep - 06 Oct	Copa
11 Sep - 24 Sep	Spirit Airlines
11 Sep - 20 Sep	Spirit Airlines
11 Sep - 13 Sep	Spirit Airlines
18 Sep - 24 Sep	Spirit Airlines
18 Sep - 20 Sep	Spirit Airlines
09 Sep - 14 Sep	Copa
03 Sep - 06 Sep	Spirit Airlines
01 Sep - 06 Sep	Spirit Airlines
02 Sep - 06 Sep	Spirit Airlines
03 Sep - 20 Sep	Spirit Airlines

Also check the deals for one-way flights from San Juan to Cancun 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 San Juan to Cancun in September from $297

Return flights