Cheapest return flights from Seattle to London in January from $578

AirHint found the following cheapest return flights from Seattle (SEA) to London (LTN) in January 2026 (see full year).

Return flights

19 Jan - 26 Jan Lufthansa
21 Jan - 28 Jan Icelandair
18 Jan - 25 Jan Lufthansa
27 Jan - 30 Jan Icelandair
30 Jan - 08 Feb Icelandair
26 Jan - 29 Jan Icelandair
22 Jan - 25 Jan Lufthansa
17 Jan - 24 Jan Lufthansa
19 Jan - 28 Jan Turkish Airlines
23 Jan - 25 Feb Lufthansa
17 Jan - 27 Jan Lufthansa
18 Jan - 22 Jan Icelandair
26 Jan - 01 Feb Alaska Airlines
25 Jan - 23 Feb Alaska Airlines
25 Jan - 21 Feb Hawaiian Airlines

Also check the deals for one-way flights from Seattle to London in January.

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