Buenos Aires
203 km²
Oslo
454 km²
Argentina
Norway
Area Comparison
Buenos Aires is 2.2x smaller than Oslo
Population Comparison
Buenos Aires has 4.3x more people than Oslo
In terms of area, Oslo is 2.2x the size of Buenos Aires. Oslo spans 454 km² (175 mi²) while Buenos Aires covers 203 km² (78 mi²) — a difference of 251 km². You could fit Buenos Aires inside Oslo approximately 2 times.
To put Buenos Aires's size in perspective, its area of 203 km² is roughly the same size as Amsterdam. Meanwhile, Oslo at 454 km² is about 1.3x smaller than Seoul.
Picture Buenos Aires another way: its area is large enough to fit about 28,000 American football fields, 100 times the area of Monaco, or 60 times the area of Central Park. Oslo, by comparison, equals about 64,000 American football fields, 130 times the area of Central Park, or 8 times the area of Manhattan.
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.
Oslo is the capital and most populous city of Norway. It constitutes both a county and a municipality. The municipality of Oslo had a population of 724,290 in 2025, while the city's greater urban area had a population of 1,110,887 in 2025, and the metropolitan area had an estimated population of 1,546,706 in 2021.
Nicknamed "Tigerstaden", Oslo has an area of 454 km² and is home to 0.7 million people. It was established in 1048. Visitors come for Vigeland Park, Oslo Opera House, Akershus Fortress, and much more.
Oslo is both a county and a municipality, with the city itself home to about 724,000 residents in 2025.
Buenos Aires has a population density of 15,074 people per km² — an extremely dense urban environment. Oslo, with 1,586 people per km², is a relatively spread-out city. Buenos Aires is dramatically more crowded, with 9.5x the population density.
Size Ratio
Buenos Aires fits inside Oslo ~2 times
Density Gap
Buenos Aires is 9.5x more densely populated
History
Oslo is ~488 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).
Oslo covers 454 km². Cities with a similar urban footprint include Prague (496 km²), Vienna (415 km²), Montreal (498 km²), Denver (401 km²), or Warsaw (517 km²).
The straight-line distance from Buenos Aires to Oslo is 12,247 km (7,610 miles), with an estimated flight time of ~14h 54m.
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