Jam-Packed: The US’s Top 10 Routes With Loads Of Up To 97%

In the 12 months to April 2025, the average seat load factor (SLF) of all US routes was 83.1%. This finding is from examining over 9,000 markets using US Department of Transportation data. As always, SLF is just one performance element and should not be considered in isolation. It is always about how it was achieved.