Miami to Chicago

What the Data Says About MIA to ORD

The Miami to Chicago corridor (MIA → ORD) covers roughly 1,197 miles and is served by 21 carriers, based on Bureau of Transportation Statistics reporting. Across 23,556 flights in the dataset, this route posts a 78.9% on-time rate with an average delay of 76.5 minutes when flights run late. Over the most recent 24 months of BTS data, 8,672 flights were recorded on this pairing — 97 cancelled (1.1%) and 40 diverted (0.5%). Those baseline metrics tell you what to expect before you book.

Having 21 carriers on the route matters: more carriers generally means more daily schedule options, competitive pricing, and redundancy when flights are cancelled. With 23,556 total flights analyzed, the 78.9% on-time figure is statistically meaningful rather than a small-sample fluke. The 76.5-minute average delay applies only to flights that actually ran late, so it is not the average wait across all departures — the majority of flights on this route depart on time under the BTS definition of a delay (15+ minutes past schedule).

Looking at recent months, Oct 2024 posted the best performance on this corridor at 91% on-time, while Jul 2025 came in at 58% on-time — a 33-point gap between best and worst recent month. For travelers evaluating the MIA to ORD route, the combination of a 78.9% on-time rate, 76.5-minute average delay, 1.1% recent cancellation rate, and 21 available carriers is the concrete summary of what BTS data shows about reliability on this pairing.