Cheapest return flights from Seattle to London in December from $485

AirHint found the following cheapest return flights from Seattle (SEA) to London (LGW) in December 2025 (see full year).

Return flights

02 Dec - 09 Dec Icelandair
06 Dec - 10 Dec Icelandair
05 Dec - 08 Dec Icelandair
29 Dec - 24 Jan Icelandair
30 Dec - 19 Jan Icelandair
28 Dec - 17 Jan Icelandair
10 Dec - 10 Jan Hawaiian Airlines
09 Dec - 10 Jan Hawaiian Airlines
11 Dec - 10 Jan Hawaiian Airlines
03 Dec - 16 Dec Icelandair
09 Dec - 09 Jan Hawaiian Airlines
04 Dec - 07 Dec Icelandair
15 Dec - 10 Jan Hawaiian Airlines
15 Dec - 09 Jan Hawaiian Airlines
26 Dec - 10 Jan Air Canada
06 Dec - 18 Dec Air Canada
08 Dec - 18 Dec Frontier Airlines
11 Dec - 14 Dec Hawaiian Airlines
07 Dec - 27 Dec Turkish Airlines
13 Dec - 24 Dec Hawaiian Airlines

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

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