AirHint found the following cheapest return flights from Washington (IAD) to London (LGW) in January 2026 (see full year).

Return flights

17 Jan - 24 Jan	Frontier Airlines
14 Jan - 28 Jan	Icelandair
21 Jan - 31 Jan	Icelandair
11 Jan - 31 Jan	Icelandair
28 Jan - 21 Feb	Icelandair
23 Jan - 01 Feb	Icelandair
07 Jan - 17 Jan	Icelandair
13 Jan - 27 Jan	Icelandair
09 Jan - 16 Jan	Icelandair
14 Jan - 20 Jan	Icelandair
05 Jan - 31 Jan	Icelandair
07 Jan - 31 Jan	Icelandair
27 Jan - 02 Feb	Icelandair
18 Jan - 07 Feb	Icelandair
28 Jan - 01 Feb	Icelandair
26 Jan - 04 Feb	Icelandair
31 Jan - 21 Feb	Icelandair
13 Jan - 07 Feb	Icelandair
30 Jan - 02 Feb	Icelandair
11 Jan - 08 Feb	Icelandair

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

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 January from $482

Return flights