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

Return flights

13 Dec - 17 Dec	Turkish Airlines
15 Dec - 10 Jan	Frontier Airlines
23 Dec - 17 Jan	Air Canada
27 Dec - 17 Jan	Lufthansa
10 Dec - 07 Jan	Frontier Airlines
26 Dec - 17 Jan	Frontier Airlines
06 Dec - 20 Dec	Turkish Airlines
22 Dec - 12 Jan	Frontier Airlines
22 Dec - 08 Jan	Frontier Airlines
22 Dec - 17 Jan	Frontier Airlines
16 Dec - 06 Jan	Frontier Airlines
24 Dec - 05 Jan	Frontier Airlines
16 Dec - 30 Dec	Brussels Airlines
28 Dec - 31 Dec	Turkish Airlines
18 Dec - 30 Dec	Frontier Airlines

Also check the deals for one-way flights from Denver to Prague 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 Denver to Prague in December from $689

Return flights