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

Return flights

06 Oct - 17 Oct	Arajet
30 Oct - 16 Nov	Spirit Airlines
30 Oct - 09 Nov	Spirit Airlines
25 Oct - 09 Nov	Spirit Airlines
15 Oct - 18 Oct	Spirit Airlines
08 Oct - 18 Oct	Copa
08 Oct - 11 Oct	Spirit Airlines
26 Oct - 09 Nov	Spirit Airlines
25 Oct - 05 Nov	Copa
17 Oct - 18 Oct	Spirit Airlines
08 Oct - 10 Oct	Spirit Airlines
08 Oct - 09 Oct	Spirit Airlines

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

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 October from $236

Return flights