Cheapest one-way flights from Washington to London in May from $347

AirHint found the following cheapest one-way flights from Washington (IAD) to London (LHR) in May 2026 (see full year).

One-Way flights

12 May Icelandair
05 May Icelandair
03 May Icelandair
06 May Aer Lingus
02 May Scandinavian Airlines
16 May Scandinavian Airlines
08 May Scandinavian Airlines
01 May Scandinavian Airlines
20 May Scandinavian Airlines
22 May Scandinavian Airlines

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

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.

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