AirHint found the following cheapest one-way flights from Washington (IAD) to London (LHR) in May 2026 (see full year).
One-Way flights
| 11 May | Icelandair | ||
| 18 May | Icelandair | ||
| 01 May | Frontier Airlines | ||
| 15 May | Icelandair | ||
| 10 May | SWISS | ||
| 17 May | Icelandair | ||
| 07 May | Icelandair | ||
| 08 May | Icelandair | ||
| 16 May | Icelandair | ||
| 19 May | Aer Lingus |
Also check the deals for return flights from Washington to London in May.
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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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