Cheapest return flights from Denver to San Juan in September from 228€

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

Return flights

16 Sep - 24 Sep Frontier Airlines
04 Sep - 10 Sep Frontier Airlines
25 Sep - 28 Sep Frontier Airlines
25 Sep - 03 Oct Frontier Airlines
13 Sep - 16 Sep Frontier Airlines
04 Sep - 09 Sep Frontier Airlines
04 Sep - 08 Sep Frontier Airlines
30 Sep - 14 Oct United
02 Sep - 08 Sep Frontier Airlines
27 Sep - 11 Oct United
25 Sep - 03 Oct United direct
25 Sep - 09 Oct United direct
16 Sep - 30 Sep United
15 Sep - 29 Sep United
17 Sep - 01 Oct United
23 Sep - 07 Oct United
24 Sep - 08 Oct United
29 Sep - 13 Oct United
09 Sep - 23 Sep United
26 Sep - 10 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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