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

Return flights

11 Dec - 14 Dec	Frontier Airlines	direct
04 Dec - 14 Dec	Frontier Airlines	direct
04 Dec - 07 Dec	Frontier Airlines	direct
12 Dec - 14 Dec	Allegiant Air
11 Dec - 11 Dec	Frontier Airlines
13 Dec - 10 Jan	Delta
30 Dec - 01 Jan	Frontier Airlines
12 Dec - 14 Dec	United	direct
11 Dec - 11 Dec	United	direct
30 Dec - 01 Jan	United	direct
13 Dec - 10 Jan	United	direct

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

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 Spokane to Denver in December from $74

Return flights