London (LHR) to Seattle (SEA)
Flight time
≈ 10h 22m
Bearing
322° NW
London (LHR) to Seattle (SEA) is 4,786 miles (7,702 km) as the crow flies — the great-circle baseline most distance-based mileage programs credit.
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What actually flies LHR–SEA
Filed traffic dataIn July 2026, British Airways operated the most departures, one of 4 carriers flying nonstop LHR–SEA; the Boeing 777-300ER was the most common aircraft at 20% of departures; flights ran 84% full.
Departures
304
July 2026
Seats
82,564
both directions
Passengers
69,759
both directions
Load factor
84.5%
RPM ÷ ASM
Who flies LHR–SEA?
British Airways operated the most nonstop LHR–SEA departures in July 2026 (120), one of 4 carriers on the route.
- BA
British Airways
120 departures · 30,596 seats
Share of departures39.5%88.0%
Load
- AS
62 departures · 18,600 seats
Share of departures20.4%83.5%
Load
- DL
62 departures · 17,418 seats
Share of departures20.4%81.2%
Load
- VS
Virgin Atlantic
60 departures · 15,950 seats
Share of departures19.7%82.5%
Load
What plane flies LHR–SEA?
In July 2026, the Boeing 777-300ER flew 20% of LHR–SEA departures — more than any other aircraft type.
- Boeing 777-300ER
62 departures · 86.7% load
20.4% - Boeing 787-9
62 departures · 83.5% load
20.4% - Airbus A330-900
61 departures · 81.1% load
20.1% - Boeing 787-10
58 departures · 89.5% load
19.1% - Airbus A330-900
55 departures · 82.8% load
18.1% - Airbus A330-300
6 departures · 80.7% load
2.0%
How has LHR–SEA traffic changed?
Nonstop LHR–SEA departures rose from 247 in August 2025 to 304 in July 2026.
Monthly nonstop LHR–SEA traffic, trailing 12 months through July 2026. Bars scale to the busiest month; months with no filed service show as zero.
August 2025
247 departures · 59,499 passengers
92.3%
Load
September 2025
239 departures · 56,028 passengers
88.7%
Load
October 2025
233 departures · 46,103 passengers
76.4%
Load
November 2025
177 departures · 32,836 passengers
77.6%
Load
December 2025
184 departures · 37,134 passengers
83.8%
Load
January 2026
185 departures · 33,458 passengers
75.0%
Load
February 2026
162 departures · 28,686 passengers
73.6%
Load
March 2026
187 departures · 37,597 passengers
83.1%
Load
April 2026
223 departures · 43,579 passengers
73.9%
Load
May 2026
269 departures · 55,164 passengers
77.5%
Load
June 2026
293 departures · 64,021 passengers
80.8%
Load
July 2026
304 departures · 69,759 passengers
84.5%
Load
By direction
Each direction is filed separately — they rarely match.
LHR → SEA
93.3% full
152 departures · 38,535 passengers
SEA → LHR
75.6% full
152 departures · 31,224 passengers
Nonstop LHR–SEA traffic has been filed since 2025.
Source: US DOT BTS Form 41 T-100 Segment (All Carriers). Data through July 2026; filings from 2025. Public domain (US Government work).
The airports
London
GB
London Heathrow Airport
Coordinates
51.47°N, 0.46°W
Hemisphere
N · W
Frequently asked
How far is London (LHR) from Seattle (SEA)?
LHR to SEA is 4,786 miles (7,702 km / 4,159 nautical miles) measured great-circle — the shortest path over the surface of the Earth.
How long is the flight from LHR to SEA?
A nonstop covers the 4,786-mile great-circle distance in roughly 10h 22m of block time, before winds. Actual schedules vary a few percent by direction and aircraft.
What plane flies LHR–SEA?
In July 2026, the Boeing 777-300ER flew the largest share of departures (20.4%), followed by the Boeing 787-9 (20.4%).
What mileage do I earn flying LHR–SEA?
Distance-based programs credit off the 4,786-mile great-circle figure, then apply your fare-class earning rate. Revenue-based programs credit off the fare instead.
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