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

Return flights

07 Jan - 10 Jan	TAP
15 Jan - 19 Jan	TAP
11 Jan - 17 Jan	TAP
07 Jan - 14 Jan	TAP
30 Jan - 07 Feb	Icelandair
08 Jan - 20 Jan	TAP
13 Jan - 20 Jan	Icelandair
23 Jan - 30 Jan	Icelandair
13 Jan - 20 Jan	British Airways	direct
23 Jan - 30 Jan	British Airways	direct
08 Jan - 20 Jan	British Airways	direct
30 Jan - 07 Feb	American Airlines	direct
28 Jan - 01 Feb	Iberia	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 $530

Return flights