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South Korea
Australia
Area Comparison
Seoul is 20.4x smaller than Sydney
Population Comparison
Seoul has 1.8x more people than Sydney
In terms of area, Sydney is 20.4x the size of Seoul. Sydney spans 12,368 km² (4,775 mi²) while Seoul covers 605 km² (234 mi²) — a difference of 11,763 km². You could fit Seoul inside Sydney approximately 20 times.
To put Seoul's size in perspective, its area of 605 km² is about 1.3x smaller than New York City. Meanwhile, Sydney at 12,368 km² is about 2.0x the size of Shanghai.
Capital of South Korea and a major tech hub. Known as "The Soul of Asia", Seoul covers 605 km² with a population of 9.8 million. The city was founded around 18 BC. Seoul is known for Gyeongbokgung Palace, Gangnam district, K-pop culture, among other attractions. The city's main transit system is the Seoul Metro.
Seoul's metro area contains nearly half of South Korea's entire population
Australia's largest city, known for the Opera House. Nicknamed "The Harbour City", Sydney has an area of 12,368 km² and is home to 5.3 million people. It was established in 1788. Visitors come for Sydney Opera House, Harbour Bridge, Bondi Beach, and much more. Getting around is easy with the Sydney Trains.
Sydney's administrative area is so large it stretches from the coast to the Blue Mountains foothills
Looking beyond city limits, the Sydney metropolitan area covers 12,368 km², which is 1.1x larger than greater Seoul at 11,704 km². The Seoul metro area is also more populous, with 25.5 million people compared to 5.3 million.
Seoul has a population density of 16,149 people per km² — an extremely dense urban environment. Sydney, with 429 people per km², is a low-density, sprawling urban area. Seoul is dramatically more crowded, with 37.6x the population density.
This comparison spans continents — Seoul in Asia versus Sydney in Oceania. Despite the geographic distance, comparing their sizes reveals surprising insights about how cities grow worldwide.
Seoul has a humid continental climate while Sydney experiences humid subtropical conditions. Winters differ dramatically: Sydney stays around 13°C while Seoul drops to -3°C.
Size Ratio
Seoul fits inside Sydney ~20 times
Density Gap
Seoul is 37.6x more densely populated
History
Seoul is ~1,806 years older
The straight-line distance from Seoul to Sydney is 8,329 km (5,176 miles), with an estimated flight time of ~10h 18m. See full distance details, including timezone difference and city facts.
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