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Vietnam
South Korea
Area Comparison
Hanoi is 5.6x larger than Seoul
Population Comparison
Hanoi has 1.2x fewer people than Seoul
Hanoi is significantly larger, covering 5.6 times the area of Seoul. Hanoi spans 3,359 km² (1,297 mi²) while Seoul covers 605 km² (234 mi²) — a difference of 2,754 km². You could fit Seoul inside Hanoi approximately 5 times.
To put Hanoi's size in perspective, its area of 3,359 km² is about 1.2x smaller than Rhode Island. Meanwhile, Seoul at 605 km² is about 1.3x smaller than New York City.
Vietnam's capital with over a thousand years of history. Known as "The City of the Ascending Dragon", Hanoi covers 3,359 km² with a population of 8.1 million. The city was established in 1010. Hanoi is known for Hoàn Kiếm Lake, Old Quarter (36 Streets), Ho Chi Minh Mausoleum, among other attractions. The city's main transit system is the Hanoi Metro.
Hanoi's Old Quarter has been a trading hub for nearly 1,000 years, with each street historically dedicated to a specific trade
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 3.5x larger than greater Hanoi at 3,359 km². The Seoul metro area is also more populous, with 25.5 million people compared to 8.1 million.
Hanoi has a population density of 2,397 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 6.7x the population density.
Both cities are in Asia, but they represent different national approaches to urban development. Hanoi (Vietnam) and Seoul (South Korea) offer a fascinating regional contrast.
Hanoi has a humid subtropical climate while Seoul experiences humid continental conditions. Winters differ dramatically: Hanoi stays around 17°C while Seoul drops to -3°C. When it's noon in Seoul, it's 10:00 AM in Hanoi — a 2-hour time difference.
Size Ratio
Seoul fits inside Hanoi ~5 times
Density Gap
Seoul is 6.7x more densely populated
History
Seoul is ~1,028 years older
The straight-line distance from Hanoi to Seoul is 2,742 km (1,704 miles), with an estimated flight time of ~3h 44m. See full distance details, including timezone difference and city facts.
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