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USA
South Korea
Area Comparison
Boston is 2.6x smaller than Seoul
Population Comparison
Boston has 14.4x fewer people than Seoul
In terms of area, Seoul is 2.6x the size of Boston. Seoul spans 605 km² (234 mi²) while Boston covers 232 km² (90 mi²) — a difference of 373 km². You could fit Boston inside Seoul approximately 2 times.
To put Boston's size in perspective, its area of 232 km² is roughly the same size as Amsterdam. Meanwhile, Seoul at 605 km² is about 1.3x smaller than New York City.
A historic city and academic center in the northeastern US. Known as "Beantown", Boston covers 232 km² with a population of 0.7 million. The city was established in 1630. Boston is known for Harvard & MIT, Freedom Trail, Fenway Park, among other attractions. The city's main transit system is the MBTA (The T).
Boston's subway system (the T) opened in 1897, making it the oldest subway in North America
Capital of South Korea and a major tech hub. Often called "The Soul of Asia", Seoul has an area of 605 km² and is home to 9.8 million people. The city dates back to 18 BC. Visitors come for Gyeongbokgung Palace, Gangnam district, K-pop culture, and much more. Getting around is easy with the Seoul Metro.
Seoul's metro area contains nearly half of South Korea's entire population
Looking beyond city limits, the Seoul metropolitan area covers 11,704 km², which is 1.0x larger than greater Boston at 11,700 km². The Seoul metro area is also more populous, with 25.5 million people compared to 4.9 million.
Boston has a population density of 2,931 people per km² — a moderately dense city. Seoul, with 16,149 people per km², is an extremely dense urban environment. Seoul is dramatically more crowded, with 5.5x the population density.
This comparison spans continents — Boston in North America versus Seoul in Asia. Despite the geographic distance, comparing their sizes reveals surprising insights about how cities grow worldwide.
Both cities share a humid continental climate, though local geography creates distinct microclimates in each. When it's noon in Seoul, it's midnight in Boston — a 14-hour time difference.
Size Ratio
Boston fits inside Seoul ~2 times
Density Gap
Seoul is 5.5x more densely populated
Time Difference
14 hours apart
History
Seoul is ~1,648 years older
The straight-line distance from Boston to Seoul is 10,942 km (6,799 miles), with an estimated flight time of ~13h 22m. See full distance details, including timezone difference and city facts.
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