How often are MDW to STL flights on time?

Flights from Chicago (MDW) to St. Louis (STL) arrive on time 84% of the time across 11,595 flights of official data.

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

Southwest Airlines has the best on-time record on this route at 84% across 11,595 flights.

Route reliability

Flights from Chicago to St. Louis arrive on time 84% of the time across 11,595 flights. Here’s how each airline really performs.

0.0

On-time rate

11,595 flights

Airline	On-time	Flights
Southwest Airlines	84%	11,595

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

How to Pick a Reliable Flight (Not Just the Cheapest)

A practical checklist for booking the flight that gets you there — not just the cheap one.

Nonstop vs. Connecting Flights: The Reliability Trade-off

A stop multiplies the ways a trip can break. When it's worth it — and how to de-risk it.

Do Morning Flights Really Have Fewer Delays?

Yes — and there's a clear reason. How delays snowball through the day.

Are Some Airlines Really More Reliable Than Others?

The reliability gap between airlines is real — here's what actually drives it.

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

Opens a partner site; we may earn a commission if you book there. It's a general fare search — nothing on it is scored.