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
04 Sep - 09 Sep	Copa
06 Sep - 09 Sep	Spirit Airlines
10 Sep - 19 Sep	Copa
06 Sep - 10 Sep	Spirit Airlines
06 Sep - 17 Sep	Spirit Airlines
06 Sep - 24 Sep	Spirit Airlines
06 Sep - 15 Sep	Spirit Airlines
12 Sep - 16 Sep	Copa
06 Sep - 14 Sep	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 $287

Return flights