ORD → STL: cancellations & delays
Over Jan 2023 - Apr 2026, 1.6% of Chicago O'Hare International Airport (ORD) to St. Louis Lambert International Airport (STL) flights were cancelled and 23.9% arrived at least 15 minutes late, across 8,403 flights, flown by MQ, AA, UA, OO, YX. Cancellations peak in January.
Check today's live ORD departures →Airport pages: Chicago O'Hare International Airport (ORD) · St. Louis Lambert International Airport (STL)
Rates are historical averages from U.S. DOT (BTS) on-time records; a specific flight's live estimate can differ with weather and the day's disruptions.