AirHint found the following cheapest one-way flights from Seattle (SEA) to London (LHR) in May 2026 (see full year).
One-Way flights
| 03 May | Icelandair | ||
| 04 May | Icelandair | ||
| 19 May | Icelandair | ||
| 18 May | Icelandair | ||
| 06 May | Icelandair | ||
| 20 May | Lufthansa | ||
| 08 May | Icelandair | ||
| 24 May | Icelandair | ||
| 22 May | Scandinavian Airlines | ||
| 03 May | KLM | direct |
Also check the deals for return flights from Seattle 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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