AirHint found the following cheapest one-way flights from Seattle (SEA) to London (LHR) in July 2026 (see full year).
One-Way flights
| 29 Jul | United | ||
| 14 Jul | Lufthansa | ||
| 06 Jul | SWISS | ||
| 08 Jul | Lufthansa | ||
| 07 Jul | Finnair | ||
| 15 Jul | Icelandair | ||
| 11 Jul | Lufthansa | ||
| 10 Jul | Alaska Airlines | ||
| 09 Jul | Lufthansa | ||
| 06 Jul | KLM | direct |
Also check the deals for return flights from Seattle to London in July.
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