Cheapest return flights from Denver to San Jose in September from $303

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

Return flights

22 Sep - 06 Oct Copa
18 Sep - 23 Sep Southwest Airlines
30 Sep - 03 Oct United
19 Sep - 23 Sep Southwest Airlines
28 Sep - 05 Oct Copa
18 Sep - 21 Sep Southwest Airlines
22 Sep - 22 Sep Frontier Airlines

Also check the deals for one-way flights from Denver to San Jose 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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