Cheapest one-way flights from Seattle to London in December from 252€

AirHint found the following cheapest one-way flights from Seattle (SEA) to London (LHR) in December 2025 (see full year).

One-Way flights

01 Dec WestJet
14 Dec Air Canada
13 Dec WestJet
29 Dec Air Canada
16 Dec WestJet
29 Dec American Airlines direct
01 Dec Air France direct
16 Dec British Airways direct
14 Dec Virgin Atlantic direct
17 Dec Hawaiian Airlines

Also check the deals for return flights from Seattle to London in December.

Skyscanner

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

Book a cheap hotel in London

Cheap car rent in London

Feel free to contact us with any feedback or request another flight research.