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

Return flights

20 Jan - 28 Jan	TAP
19 Jan - 04 Feb	TAP
28 Jan - 18 Feb	TAP
18 Jan - 30 Jan	TAP
30 Jan - 06 Feb	TAP
22 Jan - 25 Jan	TAP
21 Jan - 25 Jan	TAP
20 Jan - 25 Jan	TAP
29 Jan - 05 Feb	TAP
29 Jan - 08 Feb	TAP
26 Jan - 29 Jan	Frontier Airlines
26 Jan - 03 Feb	TAP
29 Jan - 03 Feb	TAP
18 Jan - 23 Jan	Icelandair
31 Jan - 05 Feb	Frontier Airlines
20 Jan - 27 Jan	TAP
26 Jan - 09 Feb	Icelandair
11 Jan - 16 Jan	Icelandair
11 Jan - 17 Jan	Icelandair
20 Jan - 02 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 $419

Return flights