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

Return flights

10 Dec - 16 Dec	Air Canada
08 Dec - 15 Dec	Air Canada
08 Dec - 16 Dec	Air Canada
02 Dec - 09 Dec	jetBlue
07 Dec - 12 Dec	jetBlue
30 Dec - 13 Jan	American Airlines
30 Dec - 12 Jan	American Airlines
02 Dec - 05 Dec	jetBlue
31 Dec - 11 Jan	jetBlue
04 Dec - 18 Dec	Air Canada
05 Dec - 07 Dec	Air Canada
08 Dec - 12 Dec	Icelandair
01 Dec - 09 Dec	Scandinavian Airlines
12 Dec - 21 Jan	Icelandair
11 Dec - 07 Jan	Icelandair
31 Dec - 07 Jan	jetBlue
24 Dec - 06 Jan	Air Canada
15 Dec - 10 Jan	British Airways
16 Dec - 10 Jan	British Airways
17 Dec - 11 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 $532

Return flights