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

Return flights

08 Dec - 16 Dec	British Airways
05 Dec - 12 Dec	Air Canada
30 Dec - 14 Jan	jetBlue
12 Dec - 11 Jan	Frontier Airlines
29 Dec - 14 Jan	jetBlue
12 Dec - 10 Jan	Frontier Airlines
11 Dec - 15 Dec	jetBlue
14 Dec - 21 Dec	Air Canada
08 Dec - 13 Dec	jetBlue
10 Dec - 14 Dec	jetBlue
29 Dec - 12 Jan	Icelandair
30 Dec - 12 Jan	Icelandair
29 Dec - 11 Jan	Icelandair
16 Dec - 11 Jan	jetBlue
05 Dec - 08 Dec	TAP
14 Dec - 25 Dec	Air Canada
13 Dec - 20 Dec	jetBlue
16 Dec - 19 Dec	Air Canada
29 Dec - 10 Jan	Icelandair
25 Dec - 12 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 650€

Return flights