Cheapest return flights from Seattle to London in January from $471

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

Return flights

14 Jan - 22 Jan Icelandair
23 Jan - 26 Jan Icelandair
21 Jan - 23 Feb Icelandair
14 Jan - 20 Jan Icelandair
17 Jan - 23 Jan Icelandair
22 Jan - 29 Jan Icelandair
11 Jan - 15 Jan Icelandair
29 Jan - 02 Feb Icelandair
21 Jan - 26 Jan Icelandair
11 Jan - 27 Jan Icelandair
28 Jan - 05 Feb Icelandair
24 Jan - 06 Feb Icelandair
25 Jan - 07 Feb Icelandair
16 Jan - 20 Jan Icelandair
12 Jan - 15 Jan Icelandair
28 Jan - 01 Feb Icelandair
31 Jan - 13 Feb Icelandair

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

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