Philadelphia
370 km²
San Antonio
1,209 km²
United States
United States
Area Comparison
Philadelphia is 3.3x smaller than San Antonio
Population Comparison
Philadelphia has 1.1x more people than San Antonio
In terms of area, San Antonio is 3.3x the size of Philadelphia. San Antonio spans 1,209 km² (467 mi²) while Philadelphia covers 370 km² (143 mi²) — a difference of 839 km². You could fit Philadelphia inside San Antonio approximately 3 times.
To put Philadelphia's size in perspective, its area of 370 km² is about 1.6x smaller than Seoul. Meanwhile, San Antonio at 1,209 km² is about 1.3x smaller than London.
Picture Philadelphia another way: its area is large enough to fit about 52,000 American football fields, 180 times the area of Monaco, or 110 times the area of Central Park. San Antonio, by comparison, equals about 169,000 American football fields, 20 times the area of Manhattan, or 11 times the area of Paris.
Philadelphia, colloquially referred to as Philly, is the most populous city in the U.S. state of Pennsylvania, and the sixth-most populous city in the United States, with a Census-estimated population of 1,574,281 in July 2025. The Philadelphia metropolitan area has 6.33 million residents and is the nation's ninth-largest metropolitan area. Philadelphia is known for its culture, cuisine, and history, maintaining contemporary influence in business and technology, sports, and music.
Known as "Philly", Philadelphia covers 370 km² with a population of 1.6 million. The city was established in 1682. Philadelphia is known for Liberty Bell, Independence Hall, Philly Cheesesteak, among other attractions.
Philadelphia is the sixth-most populous US city, with an estimated 1,574,281 residents as of July 2025.
San Antonio is a city in the U.S. state of Texas. It is the seventh-most populous city in the United States, the second-most populous city in Texas, and the second-most populous city in the Southern U.S., with a population of 1.43 million at the 2020 census. The Greater San Antonio metropolitan area, with an estimated 2.76 million residents, ranks as the third-largest metropolitan area in Texas and the 24th-largest in the nation. It is the county seat of Bexar County.
Nicknamed "Alamo City", San Antonio has an area of 1,209 km² and is home to 1.4 million people. The city dates back to 1718. Visitors come for The Alamo, San Antonio River Walk, Tower of the Americas, and much more.
San Antonio is the seventh-most populous city in the United States and second-most populous in Texas, with 1.43 million residents.
Philadelphia has a population density of 4,324 people per km² — a moderately dense city. San Antonio, with 1,183 people per km², is a relatively spread-out city. Philadelphia is dramatically more crowded, with 3.7x the population density.
Size Ratio
Philadelphia fits inside San Antonio ~3 times
Density Gap
Philadelphia is 3.7x more densely populated
Philadelphia covers 370 km². Cities with a similar urban footprint include Seattle (369 km²), Dhaka (368 km²), Portland (376 km²), Atlanta (348 km²), or Denver (401 km²).
San Antonio covers 1,209 km². Cities with a similar urban footprint include Rio de Janeiro (1,221 km²), Lagos (1,172 km²), Rome (1,285 km²), Los Angeles (1,302 km²), or Hong Kong (1,114 km²).
The straight-line distance from Philadelphia to San Antonio is 2,423 km (1,505 miles), with an estimated flight time of ~3h 21m.
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