Cheapest return flights from Seattle to London in January from $477

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

Return flights

28 Jan - 11 Feb Icelandair
23 Jan - 30 Jan Icelandair
10 Jan - 31 Jan Icelandair
07 Jan - 31 Jan Icelandair
16 Jan - 23 Jan Icelandair
20 Jan - 27 Jan Icelandair
12 Jan - 25 Jan Icelandair
09 Jan - 16 Jan Icelandair
12 Jan - 19 Jan Icelandair
18 Jan - 25 Jan Icelandair
22 Jan - 07 Feb Icelandair
27 Jan - 03 Feb Icelandair
30 Jan - 06 Feb Icelandair
27 Jan - 21 Feb British Airways direct
15 Jan - 30 Jan British Airways direct
26 Jan - 09 Feb Delta
28 Jan - 11 Feb British Airways direct
27 Jan - 03 Feb British Airways direct
31 Jan - 08 Feb Delta
30 Jan - 21 Feb British Airways direct

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

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