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

Return flights

15 Jan - 18 Jan	Air Canada
23 Jan - 27 Jan	Finnair
14 Jan - 21 Jan	Finnair
19 Jan - 27 Jan	Finnair
13 Jan - 21 Jan	Finnair
29 Jan - 01 Feb	Finnair
30 Jan - 07 Feb	Finnair
16 Jan - 18 Jan	Finnair
23 Jan - 25 Jan	Finnair
19 Jan - 26 Jan	Finnair
28 Jan - 01 Feb	Finnair
31 Jan - 08 Feb	Finnair
25 Jan - 01 Feb	Finnair
17 Jan - 24 Jan	Air Canada
06 Jan - 14 Jan	Air Canada
30 Jan - 01 Feb	Air Canada
29 Jan - 05 Feb	jetBlue
29 Jan - 02 Feb	jetBlue
31 Jan - 04 Feb	jetBlue
31 Jan - 14 Feb	Air Canada

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 $578

Return flights