Cheapest return flights from Denver to San Juan in September from 229€

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

Return flights

25 Sep - 02 Oct Frontier Airlines
06 Sep - 12 Sep Frontier Airlines
06 Sep - 13 Sep Frontier Airlines
08 Sep - 13 Sep Frontier Airlines
07 Sep - 11 Sep Frontier Airlines
08 Sep - 12 Sep Frontier Airlines
18 Sep - 21 Sep Frontier Airlines
25 Sep - 28 Sep Frontier Airlines
13 Sep - 27 Sep Frontier Airlines
25 Sep - 01 Oct Frontier Airlines
30 Sep - 05 Oct Frontier Airlines
30 Sep - 07 Oct Frontier Airlines
12 Sep - 15 Sep Frontier Airlines
04 Sep - 09 Sep Frontier Airlines
25 Sep - 02 Oct United direct
25 Sep - 01 Oct United direct

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

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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