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

Return flights

15 Oct - 01 Nov	Scandinavian Airlines
16 Oct - 20 Oct	Scandinavian Airlines
13 Oct - 04 Nov	ITA Airways
27 Oct - 03 Nov	United
13 Oct - 04 Nov	American Airlines	direct
27 Oct - 03 Nov	American Airlines	direct
20 Oct - 02 Nov	ITA Airways
16 Oct - 20 Oct	Finnair	direct
20 Oct - 02 Nov	American Airlines	direct
15 Oct - 01 Nov	American Airlines	direct
06 Oct - 10 Oct	Icelandair
14 Oct - 15 Oct	TAP
06 Oct - 10 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 $584

Return flights