Chicago to San Diego

What the Data Says About ORD to SAN

The Chicago to San Diego corridor (ORD → SAN) covers roughly 1,723 miles and is served by 14 carriers, based on Bureau of Transportation Statistics reporting. Across 15,737 flights in the dataset, this route posts a 79.7% on-time rate with an average delay of 76.5 minutes when flights run late. Over the most recent 24 months of BTS data, 6,242 flights were recorded on this pairing — 73 cancelled (1.2%) and 24 diverted (0.4%). Those baseline metrics tell you what to expect before you book.

Having 14 carriers on the route matters: more carriers generally means more daily schedule options, competitive pricing, and redundancy when flights are cancelled. With 15,737 total flights analyzed, the 79.7% 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, Feb 2024 posted the best performance on this corridor at 85% on-time, while Dec 2025 came in at 64% on-time — a 21-point gap between best and worst recent month. For travelers evaluating the ORD to SAN route, the combination of a 79.7% on-time rate, 76.5-minute average delay, 1.2% recent cancellation rate, and 14 available carriers is the concrete summary of what BTS data shows about reliability on this pairing.