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

Return flights

01 Dec - 10 Dec	jetBlue
03 Dec - 10 Dec	jetBlue
07 Dec - 11 Dec	jetBlue
11 Dec - 18 Dec	Air Canada
06 Dec - 13 Dec	Icelandair
12 Dec - 06 Jan	jetBlue
17 Dec - 07 Jan	jetBlue
28 Dec - 17 Jan	Frontier Airlines
30 Dec - 13 Jan	Icelandair
17 Dec - 10 Jan	Frontier Airlines
29 Dec - 07 Jan	Icelandair
30 Dec - 11 Jan	Icelandair
10 Dec - 14 Dec	TAP
14 Dec - 25 Dec	Air Canada
11 Dec - 31 Dec	Air Canada
24 Dec - 30 Dec	jetBlue
05 Dec - 14 Dec	TAP
23 Dec - 05 Jan	jetBlue
18 Dec - 07 Jan	jetBlue
21 Dec - 10 Jan	Icelandair

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 513€

Return flights