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

Return flights

17 Oct - 19 Oct	Scandinavian Airlines
18 Oct - 08 Nov	Icelandair
15 Oct - 08 Nov	Icelandair
15 Oct - 05 Nov	Icelandair
08 Oct - 29 Oct	Icelandair
01 Oct - 14 Oct	Icelandair
13 Oct - 19 Oct	Icelandair
07 Oct - 16 Oct	Icelandair
15 Oct - 22 Oct	Icelandair
14 Oct - 20 Oct	Icelandair
19 Oct - 26 Oct	Icelandair
07 Oct - 14 Oct	Icelandair
13 Oct - 17 Nov	Icelandair
21 Oct - 04 Nov	Icelandair
12 Oct - 20 Oct	Icelandair
13 Oct - 08 Nov	Icelandair
13 Oct - 18 Nov	Icelandair
28 Oct - 22 Nov	Icelandair
14 Oct - 08 Nov	Icelandair
27 Oct - 22 Nov	Icelandair

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.

Book a cheap hotel in London

Cheap car rent in London

Cheapest return flights from Washington to London in October from $446

Return flights