Buenos Aires
203 km²
Hong Kong
1,114 km²
Argentina
China
Area Comparison
Buenos Aires is 5.5x smaller than Hong Kong
Population Comparison
Buenos Aires has 2.4x fewer people than Hong Kong
In terms of area, Hong Kong is 5.5x the size of Buenos Aires. Hong Kong spans 1,114 km² (430 mi²) while Buenos Aires covers 203 km² (78 mi²) — a difference of 911 km². You could fit Buenos Aires inside Hong Kong approximately 5 times.
To put Buenos Aires's size in perspective, its area of 203 km² is roughly the same size as Amsterdam. Meanwhile, Hong Kong at 1,114 km² is about 1.2x the size of Berlin.
Buenos Aires's footprint is roughly about 28,000 American football fields, 100 times the area of Monaco, or 60 times the area of Central Park — pick whichever unit feels intuitive. Hong Kong works out to about 156,000 American football fields, 19 times the area of Manhattan, or 11 times the area of Paris.
Buenos Aires, officially the Autonomous City of Buenos Aires, is the capital and largest city of Argentina. It is located on the southwest of the Río de la Plata. Buenos Aires is classified as an Alpha− global city, according to the GaWC 2024 ranking. The city proper has a population of 3.1 million and its urban area has a population of 16.7 million, making it the 21st most populous metropolitan area in the world.
Known as "Paris of South America", Buenos Aires covers 203 km² with a population of 3.1 million. The city was established in 1536. Buenos Aires is known for La Boca's Caminito, Recoleta Cemetery, Teatro Colón, among other attractions. The city's main transit system is the Buenos Aires Subte.
Buenos Aires is classified as an Alpha− global city according to the GaWC 2024 ranking.
Hong Kong is a special administrative region of China. Situated on China's southern coast just south of Shenzhen, it consists of Hong Kong Island, Kowloon, and the New Territories. With 7.5 million residents in a 1,114-square-kilometre (430 sq mi) territory, Hong Kong is the fourth-most densely populated region in the world.
Often called "Pearl of the Orient", Hong Kong has an area of 1,114 km² and is home to 7.4 million people. The city dates back to 1841. Visitors come for Victoria Harbour, Victoria Peak, Star Ferry, and much more. Getting around is easy with the MTR Hong Kong.
Hong Kong squeezes 7.5 million residents into 1,114 km2, making it the world's fourth-most densely populated region.
Buenos Aires has a population density of 15,074 people per km² — an extremely dense urban environment. Hong Kong, with 6,652 people per km², is a densely populated city. Buenos Aires is noticeably denser, packing 2.3 times more people per square kilometer.
This comparison spans continents — Buenos Aires in South America versus Hong Kong in Asia. Despite the geographic distance, comparing their sizes reveals surprising insights about how cities grow worldwide.
Both cities share a humid subtropical climate, though local geography creates distinct microclimates in each. When it's noon in Hong Kong, it's 1:00 AM in Buenos Aires — a 11-hour time difference.
Size Ratio
Buenos Aires fits inside Hong Kong ~5 times
Density Gap
Buenos Aires is 2.3x more densely populated
Time Difference
11 hours apart
History
Buenos Aires is ~305 years older
Buenos Aires covers 203 km². Cities with a similar urban footprint include Helsinki (214 km²), Amsterdam (219 km²), Stockholm (188 km²), Osaka (225 km²), or Boston (232 km²).
Hong Kong covers 1,114 km². Cities with a similar urban footprint include Lagos (1,172 km²), San Antonio (1,209 km²), Rio de Janeiro (1,221 km²), Dallas (997 km²), or Abu Dhabi (972 km²).
The straight-line distance from Buenos Aires to Hong Kong is 18,468 km (11,476 miles), with an estimated flight time of ~22h 14m.
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