AirHint found the following cheapest one-way flights from Seattle (SEA) to London (LGW) in April 2026 (see full year).
One-Way flights
| 15 Apr | Icelandair | ||
| 01 Apr | Frontier Airlines | ||
| 21 Apr | Hawaiian Airlines | ||
| 06 Apr | Icelandair | ||
| 07 Apr | Icelandair | ||
| 04 Apr | Icelandair | ||
| 12 Apr | Air France | ||
| 16 Apr | Air France |
Also check the deals for return flights from Seattle to London in April.
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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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