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

Return flights

12 Jan - 07 Feb	Icelandair
19 Jan - 14 Feb	Icelandair
26 Jan - 21 Feb	Icelandair
08 Jan - 13 Jan	Icelandair
15 Jan - 22 Jan	Icelandair
13 Jan - 27 Jan	Icelandair
08 Jan - 16 Jan	Icelandair
11 Jan - 18 Jan	Icelandair
16 Jan - 23 Jan	Icelandair
21 Jan - 28 Jan	Icelandair
26 Jan - 02 Feb	Icelandair
14 Jan - 20 Jan	Icelandair
05 Jan - 31 Jan	Icelandair
12 Jan - 19 Jan	Icelandair
12 Jan - 07 Feb	British Airways	direct
19 Jan - 14 Feb	British Airways	direct
26 Jan - 21 Feb	British Airways	direct
26 Jan - 02 Feb	British Airways	direct

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 $493

Return flights