Cheapest one-way flights from Seattle to London in January from $258

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

One-Way flights

23 Jan Frontier Airlines
30 Jan Frontier Airlines
10 Jan Frontier Airlines
14 Jan Alaska Airlines
24 Jan Hawaiian Airlines
28 Jan Alaska Airlines
06 Jan Alaska Airlines
08 Jan Alaska Airlines
09 Jan Icelandair

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

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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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