Cheapest return flights from Washington to London in December from $601

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

Return flights

29 Dec - 13 Jan Icelandair
30 Dec - 13 Jan Icelandair
30 Dec - 14 Jan Icelandair
29 Dec - 14 Jan Icelandair
29 Dec - 15 Jan Icelandair
30 Dec - 13 Jan American Airlines direct
30 Dec - 14 Jan American Airlines direct
29 Dec - 07 Jan Air Canada
31 Dec - 08 Jan Air France direct
30 Dec - 07 Jan United
12 Dec - 19 Dec Austrian Airlines
15 Dec - 22 Dec Icelandair
12 Dec - 19 Dec Austrian Airlines direct
24 Dec - 29 Dec Austrian Airlines
12 Dec - 21 Dec Austrian Airlines direct
24 Dec - 28 Dec Air Canada
25 Dec - 28 Dec Air Canada
15 Dec - 19 Dec Icelandair
16 Dec - 26 Dec Aer Lingus
16 Dec - 23 Dec Air Canada

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

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