Route · MDW → STL · 2020–2025 BTS data
Chicago to St. Louis
The MDW–STL corridor (Chicago, IL → St. Louis, MO) runs ahead of the national average, served by 1 carrier across roughly 251 miles.
Data updated 2026-06-13
- 82.5%
- On-time
- +3.5 pts
- vs US avg
- 59 min
- Delay when late
- 10,760
- Flights
Cancelled
1.2%
Best Month
Oct 2024 94%
Worst Month
May 2024 71%
Distance
251 mi
Carriers
1
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Dec 2025 | 139 | 30 | 1 | 0 | WN |
| Nov 2025 | 127 | 18 | 4 | 0 | WN |
| Oct 2025 | 130 | 17 | 0 | 0 | WN |
| Sep 2025 | 151 | 11 | 0 | 0 | WN |
| Aug 2025 | 154 | 24 | 1 | 0 | WN |
| Jul 2025 | 169 | 48 | 2 | 0 | WN |
| Jun 2025 | 162 | 33 | 1 | 0 | WN |
| May 2025 | 169 | 26 | 2 | 0 | WN |
| Apr 2025 | 160 | 19 | 1 | 1 | WN |
| Mar 2025 | 131 | 17 | 0 | 0 | WN |
| Feb 2025 | 111 | 11 | 2 | 0 | WN |
| Jan 2025 | 127 | 19 | 6 | 0 | WN |
| Dec 2024 | 151 | 25 | 1 | 0 | WN |
| Nov 2024 | 142 | 9 | 0 | 0 | WN |
| Oct 2024 | 157 | 9 | 1 | 0 | WN |
| Sep 2024 | 162 | 18 | 0 | 0 | WN |
| Aug 2024 | 170 | 23 | 1 | 0 | WN |
| Jul 2024 | 183 | 47 | 3 | 1 | WN |
| Jun 2024 | 174 | 37 | 0 | 0 | WN |
| May 2024 | 155 | 45 | 0 | 0 | WN |
| Apr 2024 | 158 | 28 | 1 | 0 | WN |
| Mar 2024 | 163 | 20 | 0 | 0 | WN |
| Feb 2024 | 129 | 12 | 0 | 0 | WN |
| Jan 2024 | 146 | 27 | 15 | 0 | WN |
Cancellation Rate
1.2%
42 of 3,620 flights
Diversion Rate
0.1%
2 of 3,620 flights
Explore origin & destination
On-time and delay data for the airports this route connects.
MDW - Chicago
Full on-time, delay-cause, and seasonal performance for Chicago, IL.
Origin airport →STL - St. Louis
Full on-time, delay-cause, and seasonal performance for St. Louis, MO.
Destination airport →Compare the two airports
See MDW and STL side by side on delays, cancellations, and reliability.
Open comparison tool →Similar routes
Other BTS-tracked routes with comparable performance or trip length to MDW–STL.
Routes with a similar on-time rate
What the Data Says About MDW to STL
Bureau of Transportation Statistics records show Chicago to St. Louis (MDW to STL) running a 82.5% on-time rate over 10,760 tracked flights, on the stronger end of a typical domestic pairing. When flights do run late, the average delay is 58.7 minutes. The 251-mile corridor is served by 1 carrier, and over the last 24 months 1.2% of 3,620 flights were cancelled, 0.1% diverted.
The monthly split is wide on this route: Oct 2024 posted the strongest performance at 94% on-time, while May 2024 came in at just 71% - a 23-point swing worth factoring into travel timing.
Frequently Asked Questions
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Data source
Data Source: Bureau of Transportation Statistics (BTS), On-Time Performance Data. Statistics reflect cumulative performance across all available reporting periods.
Read our methodology - how this data is sourced, computed, and verified.
Every figure on PlainFlights is rendered directly from BTS On-Time Performance data, no number is typed in by an editor. This page aggregates this specific route's on-time performance and monthly trend, live from the dataset. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.