AirHint found the following cheapest one-way flights from Washington (IAD) to London (LGW) in January 2026 (see full year).
One-Way flights
| 12 Jan | Frontier Airlines | ||
| 27 Jan | TAP | ||
| 15 Jan | Frontier Airlines | ||
| 08 Jan | TAP | ||
| 07 Jan | TAP | ||
| 16 Jan | Southern Airways Express | ||
| 05 Jan | Frontier Airlines | ||
| 14 Jan | TAP | ||
| 06 Jan | Icelandair | ||
| 01 Jan | SWISS |
Also check the deals for return flights from Washington to London in January.
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