AirHint found the following cheapest one-way flights from Washington (IAD) to London (LHR) in April 2026 (see full year).
One-Way flights
| 20 Apr | Frontier Airlines | ||
| 26 Apr | Icelandair | ||
| 18 Apr | Icelandair | ||
| 19 Apr | Icelandair | ||
| 29 Apr | Icelandair | ||
| 28 Apr | Icelandair | ||
| 21 Apr | Icelandair | ||
| 24 Apr | Icelandair | ||
| 26 Apr | Lufthansa | direct | |
| 28 Apr | Lufthansa | direct |
Also check the deals for return flights from Washington to London in April.
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