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

Return flights

15 Oct - 21 Oct	TAP
14 Oct - 21 Oct	TAP
06 Oct - 21 Oct	TAP
25 Oct - 20 Nov	TAP
29 Oct - 05 Nov	TAP
05 Oct - 21 Oct	TAP
13 Oct - 21 Oct	TAP
07 Oct - 21 Oct	Icelandair
07 Oct - 01 Nov	Icelandair
08 Oct - 15 Oct	Icelandair
21 Oct - 04 Nov	Icelandair
03 Oct - 11 Oct	Icelandair
13 Oct - 08 Nov	Icelandair
19 Oct - 08 Nov	Icelandair
14 Oct - 04 Nov	Icelandair
03 Oct - 08 Oct	Icelandair
04 Oct - 11 Oct	Icelandair
28 Oct - 03 Nov	Icelandair
12 Oct - 01 Nov	Icelandair
18 Oct - 08 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.

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Cheapest return flights from Washington to London in October from $423

Return flights