The USA’s Busiest Routes In 2025: Number 3 Will Surprise You

This article considers the busiest domestic routes by seat capacity in the United States. Unsurprisingly, the airports that dominate the list are also some of the busiest airports in the country, serving some of the busiest cities as well as routes serving Alaska and Hawaii. Here is what to know about the busiest domestic air routes in the US for July 2025.