AirHint found the following cheapest return flights from Washington (DCA) to London (LHR) in October 2025 (see full year).

Return flights

08 Oct - 16 Oct	Air Canada
08 Oct - 17 Oct	Air Canada
27 Oct - 07 Nov	British Airways
29 Oct - 20 Nov	British Airways
15 Oct - 29 Oct	British Airways
21 Oct - 04 Nov	British Airways
21 Oct - 05 Nov	British Airways
21 Oct - 26 Oct	Air Canada
08 Oct - 18 Oct	Air Canada
01 Oct - 05 Oct	Air Canada
01 Oct - 18 Oct	Air Canada
29 Oct - 25 Nov	British Airways
21 Oct - 12 Nov	British Airways
12 Oct - 19 Oct	KLM
29 Oct - 05 Nov	British Airways
21 Oct - 28 Oct	British Airways
28 Oct - 04 Nov	British Airways
01 Oct - 06 Oct	jetBlue
28 Oct - 08 Nov	British Airways
23 Oct - 05 Nov	British Airways

Also check the deals for one-way flights from Washington to London in October.

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 October from $516

Return flights