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

One-Way flights

11 Oct	Frontier Airlines
04 Oct	Frontier Airlines
05 Oct	Frontier Airlines
03 Oct	Frontier Airlines
18 Oct	Frontier Airlines
19 Oct	Frontier Airlines
02 Oct	Frontier Airlines
14 Oct	Frontier Airlines
16 Oct	Frontier Airlines
23 Oct	Frontier Airlines

Also check the deals for return 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 one-way flights from Washington to London in October from 152€

One-Way flights