AirHint found the following cheapest return flights from Washington (DCA) to London (LTN) in December 2025 (see full year).

Return flights

03 Dec - 06 Dec	Air Canada
04 Dec - 09 Dec	jetBlue
29 Dec - 11 Jan	Air Canada
03 Dec - 17 Dec	Air Canada
04 Dec - 07 Dec	Air Canada
02 Dec - 11 Dec	Scandinavian Airlines
28 Dec - 17 Jan	Air Canada
12 Dec - 14 Dec	jetBlue
01 Dec - 06 Dec	jetBlue
16 Dec - 04 Jan	Air Canada
02 Dec - 27 Dec	TAP
28 Dec - 04 Jan	Frontier Airlines
21 Dec - 10 Jan	Frontier Airlines
22 Dec - 05 Jan	jetBlue
23 Dec - 05 Jan	jetBlue
26 Dec - 30 Dec	jetBlue
20 Dec - 01 Jan	jetBlue
22 Dec - 01 Jan	Iberia
20 Dec - 02 Jan	jetBlue

Also check the deals for one-way flights from Washington to London 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 London in December from $545

Return flights