AirHint found the following cheapest one-way flights from Seattle (SEA) to London (LHR) in January 2026 (see full year).
One-Way flights
| 26 Jan | WestJet | ||
| 19 Jan | WestJet | ||
| 29 Jan | Air Canada | ||
| 31 Jan | WestJet | ||
| 20 Jan | Alaska Airlines | ||
| 30 Jan | Alaska Airlines | ||
| 13 Jan | Alaska Airlines | ||
| 22 Jan | WestJet | ||
| 10 Jan | Frontier Airlines | ||
| 07 Jan | Hawaiian Airlines |
Also check the deals for return flights from Seattle to London in January.
Powered by
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.
Find us on social media