Cheapest return flights from Denver to San Jose in December from $426

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

Return flights

26 Dec - 31 Dec Frontier Airlines
25 Dec - 28 Dec American Airlines
25 Dec - 01 Jan United
28 Dec - 06 Jan United
28 Dec - 05 Jan United
29 Dec - 05 Jan United
29 Dec - 02 Jan United
25 Dec - 28 Dec United direct
25 Dec - 01 Jan United direct
28 Dec - 05 Jan United direct
28 Dec - 06 Jan United direct
26 Dec - 31 Dec United direct
29 Dec - 04 Jan Aeromexico

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

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