How often are STL to ORD flights on time?

Flights from St. Louis (STL) to Chicago (ORD) arrive on time 86% of the time across 25,052 flights of official data.

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

United Airlines has the best on-time record on this route at 87% across 14,745 flights.

Route reliability

Flights from St. Louis to Chicago arrive on time 86% of the time across 25,052 flights. Here’s how each airline really performs.

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On-time rate

25,052 flights

Airline	On-time	Flights
United Airlines	87%	14,745
American Airlines	85%	10,307

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

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

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