London
1,572 km²
Seattle
369 km²
UK
United States
Area Comparison
London is 4.3x larger than Seattle
Population Comparison
London has 12.1x more people than Seattle
In terms of area, London is 4.3x the size of Seattle. London spans 1,572 km² (607 mi²) while Seattle covers 369 km² (142 mi²) — a difference of 1,203 km². You could fit Seattle inside London approximately 4 times.
To put London's size in perspective, its area of 1,572 km² is about 1.4x smaller than Tokyo (city proper). Meanwhile, Seattle at 369 km² is about 1.6x smaller than Seoul.
London's footprint is roughly about 220,000 American football fields, 27 times the area of Manhattan, or 15 times the area of Paris — pick whichever unit feels intuitive. Seattle, by comparison, equals about 52,000 American football fields, 180 times the area of Monaco, or 110 times the area of Central Park.
London is the capital and largest city of England and the United Kingdom, with a population of 9.1 million people in 2024. Its wider metropolitan area is the largest in Western Europe, with a population of 15.1 million. London stands on the River Thames in southeast England, at the head of a 50-mile (80 km) tidal estuary down to the North Sea, and has been a major settlement for nearly 2,000 years.
Known as "The Big Smoke", London covers 1,572 km² with a population of 9.0 million. The city was established in 43. London is known for Big Ben, Tower Bridge, Buckingham Palace, among other attractions. The city's main transit system is the London Underground.
London has been a major settlement for nearly 2,000 years, tracing its roots back to Roman times around 47 AD.
Seattle is the most populous city in the U.S. state of Washington and the Pacific Northwest region of North America. It is the 18th-most populous city in the United States with a population of 780,995 in 2024, while the Seattle metropolitan area at over 4.15 million residents is the 15th-most populous metropolitan area in the nation. The city is the county seat of King County, the most populous county in Washington.
Often called "The Emerald City", Seattle has an area of 369 km² and is home to 0.7 million people. The city dates back to 1851. Visitors come for Space Needle, Pike Place Market, Starbucks headquarters, and much more.
Seattle is Washington's most populous city with 780,995 residents in 2024, anchoring the Pacific Northwest.
London has a population density of 5,712 people per km² — a densely populated city. Seattle, with 2,005 people per km², is a moderately dense city. London is noticeably denser, packing 2.8 times more people per square kilometer.
Size Ratio
Seattle fits inside London ~4 times
Density Gap
London is 2.8x more densely populated
History
London is ~1,808 years older
London covers 1,572 km². Cities with a similar urban footprint include Bangkok (1,569 km²), Bogotá (1,578 km²), São Paulo (1,521 km²), Johannesburg (1,644 km²), or Mexico City (1,485 km²).
Seattle covers 369 km². Cities with a similar urban footprint include Philadelphia (370 km²), Dhaka (368 km²), Portland (376 km²), Atlanta (348 km²), or Denver (401 km²).
The straight-line distance from London to Seattle is 7,700 km (4,784 miles), with an estimated flight time of ~9h 34m.
Want to explore more? Compare city sizes for any two cities worldwide, or share your location live with friends.