AirHint found the following cheapest one-way flights from Seattle (SEA) to London (LHR) in April 2026 (see full year).
One-Way flights
| 17 Apr | WestJet | ||
| 14 Apr | Air Canada | ||
| 01 Apr | Air Canada | ||
| 14 Apr | Virgin Atlantic | direct | |
| 01 Apr | Air France | direct | |
| 17 Apr | Air France | direct |
Also check the deals for return flights from Seattle to London in April.
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