Cheapest return flights from Denver to San Juan in August from $159

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

Return flights

28 Aug - 05 Sep Frontier Airlines
07 Aug - 14 Aug Frontier Airlines
28 Aug - 06 Sep Frontier Airlines
08 Aug - 14 Aug Frontier Airlines
30 Aug - 06 Sep Frontier Airlines
06 Aug - 11 Aug Frontier Airlines
14 Aug - 28 Aug Frontier Airlines
02 Aug - 06 Aug Frontier Airlines
01 Aug - 09 Aug Frontier Airlines
03 Aug - 07 Aug Frontier Airlines
22 Aug - 26 Aug Frontier Airlines
26 Aug - 31 Aug Frontier Airlines
14 Aug - 18 Aug Frontier Airlines
28 Aug - 01 Sep Frontier Airlines
22 Aug - 05 Sep United
29 Aug - 12 Sep United
31 Aug - 14 Sep United
30 Aug - 13 Sep United direct
30 Aug - 06 Sep United direct
21 Aug - 04 Sep United

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

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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