Miami, FL

What the Data Says About MIA

Miami, FL in Miami, Florida handled 1,160,127 flights in the Bureau of Transportation Statistics dataset between 2020 and 2025, posting a 77.9% on-time departure rate. Of those flights, 256,336 experienced delays, 11,802 were cancelled, and 1,594 were diverted. The cancellation rate works out to 1.02%, the diversion rate to 0.14%, and the average delay when departures run late is 78.6 minutes. These figures are the baseline for comparing MIA against other airports in the same state and nationally.

Breaking down what drives delays at MIA, Late Aircraft leads the pack. Late Aircraft accounts for 37.5% of total delay minutes, followed by Carrier at 35.8% and NAS (National Aviation System) at 20.4%. Weather contributes 5.9% of delay minutes at this airport, while security holds the smallest share at 0.3%. Travelers often overestimate the weather share; the BTS categorization shows late-arriving aircraft and carrier operations as the larger contributors.

Seasonally, October runs the cleanest at MIA with a 91.4% on-time rate, while June is the roughest at 84.7% — a 7-point swing between best and worst month. Volume peaks in March, when average flights hit 18,588. The busiest route from MIA is to MIA (Miami), with 37,418 flights at a 76.7% on-time rate. Combine these numbers — 77.9% on-time, 78.6-minute average delay, 1.02% cancellation rate — and you have a concrete picture of departure reliability at Miami, FL.