Cheapest one-way flights from Seattle to London in December from 262€

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

One-Way flights

06 Dec Alaska Airlines
03 Dec WestJet
11 Dec Air Canada
14 Dec Hawaiian Airlines
12 Dec Frontier Airlines
16 Dec Hawaiian Airlines
15 Dec Icelandair
19 Dec Icelandair
26 Dec Lufthansa
20 Dec Sun Country Airlines

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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