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

Return flights

04 Dec - 10 Dec	Scandinavian Airlines
04 Dec - 09 Dec	Scandinavian Airlines
03 Dec - 10 Dec	TAP
04 Dec - 17 Dec	TAP
04 Dec - 16 Dec	TAP
02 Dec - 09 Dec	Turkish Airlines
15 Dec - 08 Jan	British Airways
27 Dec - 17 Jan	SWISS
24 Dec - 29 Dec	Air Canada
22 Dec - 29 Dec	Lufthansa
17 Dec - 31 Dec	Scandinavian Airlines
23 Dec - 31 Dec	Icelandair
24 Dec - 02 Jan	Scandinavian Airlines
21 Dec - 01 Jan	SWISS
20 Dec - 03 Jan	Icelandair
20 Dec - 01 Jan	Scandinavian Airlines

Also check the deals for one-way flights from Washington 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 Washington to Prague in December from $444

Return flights