Cheapest return flights from Washington to London in December from $576

Best time to book flights for Washington (IAD) to London (LHR) flights at AirHint

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

Return flights

11 Dec - 25 Dec Icelandair
11 Dec - 21 Dec Icelandair
08 Dec - 22 Dec Icelandair
25 Dec - 08 Jan TAP
29 Dec - 05 Jan Air Canada
24 Dec - 30 Dec TAP
22 Dec - 05 Jan Air Canada
08 Dec - 22 Dec British Airways direct
11 Dec - 25 Dec Finnair direct
29 Dec - 02 Jan TAP
24 Dec - 30 Dec Delta direct
11 Dec - 21 Dec British Airways direct
18 Dec - 14 Jan TAP
18 Dec - 07 Jan TAP
25 Dec - 08 Jan British Airways direct
29 Dec - 05 Jan Delta direct
18 Dec - 14 Jan Delta direct
20 Dec - 03 Jan TAP

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

Skyscanner

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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