Austin, Texas is 5.3 times larger than Irving, Texas.
Area: 175 km2 calculated
Irving is a city located in the U.S. state of Texas within Dallas County. According to a 2012 estimate from the U.S. Census Bureau, the city population was 225,427 making it the thirteenth most populous city in Texas. Wikipedia
Area: 933 km2 calculated
Austin is the capital of Texas and the seat of Travis County. Located in Central Texas and the American Southwest, it is the 11th-most populous city in the United States of America and the fourth-most populous city in the state of Texas. Wikipedia