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

Return flights

21 Jan - 04 Feb	TAP
21 Jan - 06 Feb	TAP
23 Jan - 06 Feb	TAP
29 Jan - 03 Feb	TAP
28 Jan - 04 Feb	TAP
25 Jan - 03 Feb	TAP
30 Jan - 21 Feb	Icelandair
31 Jan - 21 Feb	Icelandair
22 Jan - 29 Jan	Aer Lingus
22 Jan - 03 Feb	TAP
31 Jan - 06 Feb	Frontier Airlines
23 Jan - 30 Jan	TAP
21 Jan - 30 Jan	TAP
26 Jan - 31 Jan	Icelandair
20 Jan - 26 Jan	Lufthansa
22 Jan - 26 Jan	SWISS
23 Jan - 29 Jan	SWISS
23 Jan - 27 Jan	SWISS
23 Jan - 31 Jan	SWISS
24 Jan - 29 Jan	SWISS

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 362€

Return flights