STL → ORD: cancellations & delays
Over Jan 2023 - Apr 2026, 1.8% of St. Louis Lambert International Airport (STL) to Chicago O'Hare International Airport (ORD) flights were cancelled and 24.4% arrived at least 15 minutes late, across 8,603 flights, flown by MQ, AA, UA, OO, YX. Cancellations peak in January.
Check today's live STL departures →Airport pages: St. Louis Lambert International Airport (STL) · Chicago O'Hare International Airport (ORD)
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.