Cheapest return flights from Denver to San Juan in October from $268

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

Return flights

17 Oct - 21 Oct Frontier Airlines
03 Oct - 06 Oct Frontier Airlines
02 Oct - 06 Oct Frontier Airlines
22 Oct - 26 Oct Frontier Airlines
03 Oct - 07 Oct Frontier Airlines
31 Oct - 04 Nov Frontier Airlines
28 Oct - 04 Nov Frontier Airlines
17 Oct - 20 Oct Frontier Airlines
17 Oct - 19 Oct Frontier Airlines
09 Oct - 19 Oct Frontier Airlines
02 Oct - 06 Oct United direct
17 Oct - 21 Oct United direct
31 Oct - 04 Nov United direct

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

Skyscanner

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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