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

Return flights

01 Oct - 08 Oct	Air Canada
01 Oct - 07 Oct	Iberia
12 Oct - 25 Oct	Lufthansa
03 Oct - 16 Oct	Air Canada
07 Oct - 17 Oct	Virgin Atlantic
06 Oct - 13 Oct	Air Canada
08 Oct - 25 Oct	Delta
15 Oct - 20 Oct	Delta
11 Oct - 15 Oct	Delta
16 Oct - 23 Oct	Delta
30 Oct - 03 Nov	KLM
30 Oct - 06 Nov	United
25 Oct - 01 Nov	United

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 408€

Return flights