Cheapest one-way flights from Seattle (SEA) to London (LHR), December

Select a price to book. see full year.

Dates, airline, and price
Dates Airline Price
06 Dec Alaska Airlines
05 Dec Alaska Airlines
31 Dec Icelandair
07 Dec Icelandair
12 Dec Icelandair
08 Dec Icelandair
02 Dec Icelandair
04 Dec Icelandair
03 Dec Icelandair
08 Dec American Airlines
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deals for return flights from Seattle to London in December.

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Updated Jul 18, 2026.

About these fares

These results come from our latest search across airlines for your currency. Prices change quickly and are not locked until you complete booking—always confirm the total and fare rules on the partner site.

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