Direct (nonstop) flights from London to Seattle
4 airlines fly nonstop from Heathrow (LHR) to Seattle Tacoma International (SEA). It's 4,800 miles (7,725 km), about 10h in the air. Operated by Alaska Airlines, British Airways, Delta Air Lines and others.
Alaska Airlines
British Airways
Delta Air Lines
Virgin Atlantic
Route data last updated: May 29, 2026
Airlines with non-stop flights
Alternative Routes
Other ways to fly from London to Seattle with one stop · direct emits 734 kg CO₂ per passenger
Looking for the return flight?
SEA → LHR: Flights from Seattle to LondonOther direct flights from London
Direct flights from Seattle (SEA)
Frequently Asked Questions
How long is the direct flight from London to Seattle?
A nonstop flight from London (LHR) to Seattle (SEA) takes approximately 10 hours. The distance is 4,800 miles (7,725 km).
Which airlines fly nonstop from London to Seattle?
4 airlines: Alaska Airlines, British Airways, Delta Air Lines, Virgin Atlantic.
Is there a nonstop flight from London to Seattle?
Yes. 4 airlines: Alaska Airlines, British Airways, Delta Air Lines, Virgin Atlantic.
How far is London from Seattle?
The flight distance from London to Seattle is 4,800 miles (7,725 km), measured as the great-circle (shortest air) distance. That's roughly the same distance as New York to Rome.
What is the time difference between London and Seattle?
Seattle is 8 hours behind London. (Europe/London vs America/Los_Angeles.)
Will I experience jet lag flying from London to Seattle?
Probably — 8-hour time difference means significant jet lag. Expect about 1 day of adjustment per hour of shift. Flying westward is generally easier to adjust to.
What type of aircraft flies from London to Seattle?
At 10h, this route typically uses wide-body aircraft — Boeing 777, 787, or Airbus A330/A350. Varies by airline.
Do I need a visa to travel from United Kingdom to USA?
Depends on your passport. Check with the USA embassy or an official visa portal before booking — requirements change.
What is the carbon footprint of a flight from London to Seattle?
Roughly 734 kg CO2 per passenger one-way. That's about the same as driving 3,670 km.
Is the return flight from Seattle to London also nonstop?
Yes — nonstop flights run both ways. Flight time may differ slightly due to wind patterns.
When is the cheapest time to fly from London to Seattle?
Midweek flights (Tue/Wed) outside holiday peaks are usually cheapest. For long-haul, booking 2-3 months out tends to help. Use "Check Prices" above to compare.
How early should I arrive at Heathrow for this flight?
3 hours before departure for international flights. You need time for check-in, security, and immigration.