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

Return flights

03 Dec - 08 Dec	jetBlue
03 Dec - 09 Dec	jetBlue
03 Dec - 10 Dec	jetBlue
06 Dec - 12 Dec	jetBlue
24 Dec - 10 Jan	Air Canada
04 Dec - 09 Dec	jetBlue
24 Dec - 28 Dec	Air Canada
23 Dec - 29 Dec	American Airlines
03 Dec - 13 Dec	Icelandair
13 Dec - 29 Jan	Icelandair
15 Dec - 08 Jan	Icelandair
23 Dec - 30 Dec	Air Canada
15 Dec - 04 Jan	jetBlue
15 Dec - 06 Jan	Icelandair
17 Dec - 24 Dec	Air Canada
21 Dec - 09 Jan	Air Canada
28 Dec - 11 Jan	Icelandair
23 Dec - 11 Jan	Icelandair
25 Dec - 06 Jan	TAP
14 Dec - 02 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 $509

Return flights