30 major US airports with the most departure delays, ranked

Salt Lake City International topped the list — about 83.7% of departures were on time (Jan–Jun 2026).
Fort Lauderdale–Hollywood was the worst — roughly 66.4% on-time departures in the same period.
Bottom line for travelers: the airport you fly from (and factors like weather and the dominant carriers) really affects your odds — major hubs mostly fell in the high‑60s to mid‑70s on-time range.