Only 38% Full: Southwest Airlines’ 10 Emptiest Routes Revealed [Full List]

Southwest Airlines plays a critical role in US aviation. Between March 2025 and February 2026, the country’s Department of Transportation (DOT) shows that it transported 170 million passengers. However, compared to the prior 12 months, traffic fell by nearly 4.7 million passengers. Its overall load factor (which is technically the seat factor) was 77.4%.