Book Cheap Flights from London with Alaska Airlines
Find round-trip flight deals from London.*
London (LHR)to
Seattle (SEA)*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.
One-way flight deals from London.*
From | To | Fare Type | Dates | Price | |
|---|---|---|---|---|---|
| London (LHR) | Seattle (SEA) | One-way | Saver | Depart: Aug 24, 2026 | From $562 Seen: 1 hour ago | |
| London (LHR) | Seattle (SEA) | One-way | Saver | Depart: Nov 8, 2026 | From $562 Seen: 6 hours ago | |
| London (LHR) | Seattle (SEA) | One-way | Saver | Depart: Aug 21, 2026 | From $562 Seen: 48 minutes ago | |
| London (LHR) | Seattle (SEA) | One-way | Saver | Depart: Sep 24, 2026 | From $562 Seen: 2 hours ago | |
| London (LHR) | Seattle (SEA) | One-way | Saver | Depart: Oct 21, 2026 | From $562 Seen: 3 hours ago | |
| London (LHR) | Seattle (SEA) | One-way | Saver | Depart: Aug 8, 2026 | From $612 Seen: 16 hours ago | |
| London (LHR) | Los Angeles (LAX) | One-way | Saver | Depart: Apr 5, 2027 | From $1,101 Seen: 3 hours 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.