Cheapest return flights from Denver (DEN) to San Juan (SJU), September

Select a price to book. see full year.

Dates, airline, and price
Dates Airline Price
17 Sep 21 Sep Frontier Airlines
23 Sep 28 Sep Frontier Airlines
24 Sep 28 Sep Frontier Airlines
25 Sep 29 Sep Frontier Airlines
23 Sep 29 Sep Frontier Airlines
24 Sep 29 Sep Frontier Airlines
18 Sep 22 Sep Frontier Airlines
16 Sep 25 Sep Frontier Airlines
21 Sep 25 Sep Frontier Airlines
19 Sep 27 Sep Frontier Airlines
25 Sep 01 Oct Frontier Airlines
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deals for one-way flights from Denver to San Juan in September.

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Updated Aug 26, 2026.

About these fares

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