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

One-Way flights

12 Aug	Spirit Airlines
16 Aug	Spirit Airlines
02 Aug	Frontier Airlines
09 Aug	Arajet
13 Aug	Copa
26 Aug	Spirit Airlines
01 Aug	Frontier Airlines
11 Aug	Frontier Airlines
17 Aug	Spirit Airlines
15 Aug	Spirit Airlines

Also check the deals for return flights from Cancun to San Juan 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 one-way flights from Cancun to San Juan in August from 105€

One-Way flights