$399 Cheap Brussels Airlines flights Seattle (SEA) to London (LHR)

View $399 flight on Sun, Feb 15, 2026Opens in a new window

$399 Cheap Brussels Airlines flights Seattle (SEA) to London (LHR)

Prices were available within the past 7 days and start at $399 for one-way flights and $651 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Brussels Airlines
Tue, Apr 7 - Tue, Apr 21
SEA
Seattle
LHR
London
$651 Roundtrip, found 12 hours ago
$651
Roundtrip
found 12 hours ago
Select Brussels Airlines flight, departing Tue, Apr 7 from Seattle to London, returning Tue, Apr 21, priced at $651 found 12 hours ago
Brussels Airlines
Sun, Feb 15 - Tue, Mar 3
SEA
Seattle
LHR
London
$654 Roundtrip, found 6 days ago
$654
Roundtrip
found 6 days ago
Select Brussels Airlines flight, departing Sun, Feb 15 from Seattle to London, returning Tue, Mar 3, priced at $654 found 6 days ago
Flights from Seattle (SEA) to London (LHR)
Origin airport
Seattle - Tacoma Intl.
Destination airport
Heathrow
Airlines serving
Aer Lingus, Air Canada, Air France, American Airlines, Austrian Airlines, British Airways, Brussels Airlines, Delta, Finnair, Iberia, Icelandair, JetBlue Airways, KLM, Lufthansa, Turkish Airlines, United, Virgin Atlantic, WestJet
Popular airline
British Airways
Distance
7657 km
Average flight time
17 hours 34 mins