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

Return flights

09 Aug - 16 Aug	jetBlue
17 Aug - 22 Aug	Copa
18 Aug - 22 Aug	Copa
30 Aug - 06 Sep	Copa
11 Aug - 16 Aug	Copa
05 Aug - 11 Aug	Spirit Airlines
21 Aug - 24 Aug	Copa
19 Aug - 24 Aug	Copa
14 Aug - 17 Aug	Copa
05 Aug - 13 Aug	Spirit Airlines
05 Aug - 22 Aug	Spirit Airlines
21 Aug - 06 Sep	Spirit Airlines
22 Aug - 06 Sep	Spirit Airlines
27 Aug - 06 Sep	Spirit Airlines
23 Aug - 06 Sep	Spirit Airlines
17 Aug - 06 Sep	Spirit Airlines
21 Aug - 11 Sep	Spirit Airlines
16 Aug - 06 Sep	Spirit Airlines
22 Aug - 11 Sep	Spirit Airlines
27 Aug - 11 Sep	Spirit Airlines

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

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 August from $280

Return flights