Cheapest return flights from Washington to London in December from $549

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

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

Return flights

03 Dec - 24 Dec TAP
02 Dec - 24 Dec TAP
02 Dec - 09 Dec Icelandair
02 Dec - 13 Dec Icelandair
03 Dec - 11 Dec Icelandair
01 Dec - 14 Dec Icelandair
02 Dec - 14 Dec Icelandair
03 Dec - 14 Dec Icelandair
07 Dec - 12 Dec Icelandair
01 Dec - 08 Dec Icelandair
30 Dec - 09 Jan Icelandair
31 Dec - 07 Jan TAP
24 Dec - 14 Jan TAP
24 Dec - 18 Jan TAP
23 Dec - 13 Jan Icelandair
23 Dec - 11 Jan Icelandair
17 Dec - 07 Jan TAP
17 Dec - 09 Jan TAP
17 Dec - 12 Jan Icelandair
30 Dec - 06 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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