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

Return flights

23 Jan - 30 Jan	TAP
22 Jan - 26 Jan	Icelandair
20 Jan - 27 Jan	Icelandair
22 Jan - 25 Jan	Scandinavian Airlines
28 Jan - 04 Feb	Icelandair
23 Jan - 26 Jan	Icelandair
18 Jan - 25 Jan	Scandinavian Airlines
17 Jan - 26 Jan	Icelandair
18 Jan - 26 Jan	Icelandair
29 Jan - 02 Feb	Icelandair
22 Jan - 28 Jan	Icelandair
12 Jan - 19 Jan	Air Canada
25 Jan - 01 Feb	Icelandair
22 Jan - 11 Feb	Air Canada
28 Jan - 11 Feb	TAP
11 Jan - 08 Feb	Scandinavian Airlines
23 Jan - 11 Feb	TAP
21 Jan - 11 Feb	Aer Lingus
21 Jan - 12 Feb	Aer Lingus
02 Jan - 01 Feb	TAP

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 $467

Return flights