Book Cheap Flights from United Kingdom with Alaska Airlines
Find round-trip flight deals from United Kingdom.*
London (LHR)to
Seattle (SEA)
London (LHR)to
Los Angeles (LAX)*Displayed prices have been available within the past 24 hours and may not be available at the time of booking. Fares listed may be Saver fares, which is our most restrictive fare option and subject to additional restrictions. For roundtrip journeys, the price displayed—available within the past 24 hours—is the aggregate of the lowest available fare each way. Additional baggage charges and fees for optional products and services may apply. Other terms and conditions may apply.
Lowest one-way fares from United Kingdom.*
From | To | Fare Type | Dates | Price | |
|---|---|---|---|---|---|
| London (LHR) | Seattle (SEA) | One-way | Saver | Depart: Sep 13, 2026 | From $1,055 Seen: 10 hours ago | |
| London (LHR) | Seattle (SEA) | One-way | Saver | Depart: Jul 1, 2026 | From $1,072 Seen: 16 hours ago | |
| London (LHR) | Seattle (SEA) | One-way | Saver | Depart: Oct 9, 2026 | From $1,090 Seen: 7 hours ago | |
| London (LHR) | Seattle (SEA) | One-way | Saver | Depart: Jun 26, 2026 | From $1,110 Seen: 34 minutes ago | |
| London (LHR) | Seattle (SEA) | One-way | Saver | Depart: Jun 20, 2026 | From $1,110 Seen: 14 minutes ago |
*Displayed prices have been available within the past 24 hours and may not be available at the time of booking. Fares listed may be Saver fares, which is our most restrictive fare option and subject to additional restrictions. For roundtrip journeys, the price displayed—available within the past 24 hours—is the aggregate of the lowest available fare each way. Additional baggage charges and fees for optional products and services may apply. Other terms and conditions may apply.