Seattle (SEA) to London (LHR) flights
British Airways, Delta Air Lines, Alaska Airlines, Virgin Atlantic fly nonstop from Seattle-Tacoma International Airport to London Heathrow Airport, with about 34 flights a week in July 2026. The 4,800-mile flight takes about 3h 4m gate to gate.
From
SEA
Seattle
Seattle-Tacoma International Airport
To
LHR
London
London Heathrow Airport
- Distance
- 4,800 mi · 7,725 km
- Flight time
- 3h 4m
- Airlines
- 4
- Seats filled
- 82%
Flights a week, July 2026
1,351 flights and 284,793 passengers in 12 months
Airlines flying SEA to LHR
| Airline | Flights a week | Aircraft | Passengers (12 months) | Flight time |
|---|---|---|---|---|
| British Airways | 14 | Boeing 787-10 Dreamliner, Boeing 777-300/300ER/333ER, Boeing 777-200ER/200LR/233LR | 136,565 | 0m |
| Delta Air Lines | 7 | Airbus A330-900, Airbus A330-200, Airbus A330-300/333 | 74,152 | 9h 36m |
| Alaska Airlines | 7 | Boeing 787-9 Dreamliner | 15,869 | 9h 24m |
| Virgin Atlantic | 7 | Airbus A330-900neo, Boeing 787-9 Dreamliner, Airbus A330-300/333 | 58,207 | 0m |
Airlines are the operating carrier: regional airlines such as SkyWest or Horizon often fly under a larger airline's brand.
Flights by month
| Month | Flights | Flights, relative | Passengers |
|---|---|---|---|
| August 2025 | 123 | 29,896 | |
| September 2025 | 120 | 29,670 | |
| October 2025 | 117 | 21,996 | |
| November 2025 | 88 | 17,369 | |
| December 2025 | 92 | 18,883 | |
| January 2026 | 92 | 16,942 | |
| February 2026 | 81 | 14,705 | |
| March 2026 | 93 | 18,671 | |
| April 2026 | 111 | 22,120 | |
| May 2026 | 135 | 28,744 | |
| June 2026 | 147 | 34,573 | |
| July 2026 | 152 | 31,224 |
Related
Source: US Department of Transportation, T-100 Segment data, August 2025 to July 2026.