Cheapest one-way flights from Seattle to London in December from 294€

AirHint found the following cheapest one-way flights from Seattle (SEA) to London (LHR) in December 2025 (see full year).

One-Way flights

08 Dec WestJet
12 Dec Alaska Airlines
08 Dec Air France direct
12 Dec Air France direct
27 Dec Alaska Airlines
27 Dec Air France direct

Also check the deals for return flights from Seattle to London in December.

Skyscanner

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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