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	Copa
19 Sep - 23 Sep	Aeromexico
10 Sep - 19 Sep	Copa
12 Sep - 16 Sep	Copa
12 Sep - 30 Sep	Copa
27 Sep - 18 Oct	Spirit Airlines
20 Sep - 26 Sep	Spirit Airlines
20 Sep - 25 Sep	Spirit Airlines
20 Sep - 23 Sep	Spirit Airlines
21 Sep - 26 Sep	Spirit Airlines
21 Sep - 25 Sep	Spirit Airlines
27 Sep - 17 Oct	Spirit Airlines
27 Sep - 16 Oct	Spirit Airlines
27 Sep - 13 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 $234

Return flights