Cheapest one-way flights from Washington to London in October from $350

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

One-Way flights

20 Oct Aer Lingus
12 Oct Porter Airlines (Canada) Ltd
14 Oct Icelandair
27 Oct Icelandair
06 Oct Porter Airlines (Canada) Ltd
19 Oct Porter Airlines (Canada) Ltd
05 Oct Porter Airlines (Canada) Ltd
22 Oct Aer Lingus
21 Oct Aer Lingus
26 Oct SWISS

Also check the deals for return flights from Washington to London in October.

Skyscanner

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

Feel free to contact us with any feedback or request another flight research.