Cheapest return flights from Washington to London in December from $602

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

07 Dec - 14 Dec Icelandair
16 Dec - 24 Dec Icelandair
16 Dec - 21 Dec Icelandair
31 Dec - 06 Jan Icelandair
07 Dec - 14 Dec British Airways direct
29 Dec - 04 Jan TAP
27 Dec - 05 Jan TAP
23 Dec - 28 Dec Icelandair
18 Dec - 11 Jan Icelandair
17 Dec - 29 Dec Aer Lingus
16 Dec - 24 Dec British Airways direct
17 Dec - 02 Jan Aer Lingus
16 Dec - 21 Dec British Airways direct
19 Dec - 30 Dec Aer Lingus
18 Dec - 28 Dec Icelandair
20 Dec - 03 Jan Aer Lingus
26 Dec - 04 Jan TAP
18 Dec - 11 Jan British Airways direct
29 Dec - 04 Jan Delta direct
27 Dec - 05 Jan KLM direct

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

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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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