Cheapest return flights from Seattle to London in December from 510€

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

Return flights

01 Dec - 08 Dec Icelandair
01 Dec - 08 Dec KLM direct
29 Dec - 12 Jan Lufthansa
07 Dec - 21 Dec Icelandair
10 Dec - 24 Dec Icelandair
07 Dec - 21 Dec Air France direct
23 Dec - 30 Dec Air France direct
29 Dec - 12 Jan British Airways direct
10 Dec - 24 Dec Finnair direct
24 Dec - 30 Dec Air France direct

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

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