Cheapest one-way flights from Seattle to London in December from 351€

AirHint found the following cheapest one-way flights from Seattle (SEA) to London (LHR) in December 2026 (see full year).

One-Way flights

28 Dec Delta direct
23 Dec United
23 Dec Air France direct
20 Dec WestJet
20 Dec Air France direct

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

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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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