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

Return flights

31 Oct - 02 Nov	United	direct
27 Oct - 29 Oct	Copa
27 Oct - 30 Oct	Copa
26 Oct - 28 Oct	Frontier Airlines
01 Oct - 06 Oct	United
18 Oct - 22 Oct	United
03 Oct - 12 Oct	United
22 Oct - 03 Nov	United
23 Oct - 03 Nov	United
24 Oct - 26 Oct	Copa
27 Oct - 28 Oct	Copa
08 Oct - 15 Oct	United
31 Oct - 31 Oct	Frontier Airlines

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

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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Cheapest return flights from Denver to San Jose in October from 254€

Return flights