How often are ORD to STL flights on time?

Flights from Chicago (ORD) to St. Louis (STL) arrive on time 82% of the time across 24,607 flights of official data.

Which airline is most reliable on the ORD to STL route?

United Airlines has the best on-time record on this route at 82% across 14,474 flights.

Route reliability

Flights from Chicago to St. Louis arrive on time 82% of the time across 24,607 flights. Here’s how each airline really performs.

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On-time rate

24,607 flights

Airline	On-time	Flights
United Airlines	82%	14,474
American Airlines	81%	10,133

On-time = arrived within 15 minutes of schedule, per BTS TranStats. Compare the reverse leg STL → ORD.

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Score real ORD–STL flights on reliability, weather, and connection safety — not just price.