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

Return flights

16 Oct - 20 Oct	Icelandair
05 Oct - 10 Oct	Icelandair
25 Oct - 30 Oct	Icelandair
23 Oct - 30 Oct	Icelandair
18 Oct - 31 Oct	Icelandair
24 Oct - 30 Oct	Aer Lingus
15 Oct - 19 Oct	Iberia
18 Oct - 24 Oct	SWISS
23 Oct - 30 Oct	British Airways	direct
16 Oct - 20 Oct	British Airways	direct

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 527€

Return flights