Route · ORD → STL · 2020–2025 BTS data
Chicago to St. Louis
The ORD–STL corridor (Chicago, IL → St. Louis, MO) runs ahead of the national average, served by 40 carriers across roughly 258 miles.
Data updated 2026-06-13
- 79.7%
- On-time
- +0.7 pts
- vs US avg
- 73 min
- Delay when late
- 13,359
- Flights
Cancelled
1.5%
Best Month
Oct 2024 90%
Worst Month
Dec 2025 61%
Distance
258 mi
Carriers
40
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Dec 2025 | 241 | 95 | 8 | 1 | YX,AA,MQ,UA,OO |
| Nov 2025 | 240 | 53 | 11 | 0 | OO,UA,MQ,AA,YX |
| Oct 2025 | 273 | 74 | 0 | 0 | AA,OO,UA,YX,MQ |
| Sep 2025 | 240 | 39 | 2 | 0 | MQ,UA,OO,YX,AA |
| Aug 2025 | 256 | 69 | 8 | 0 | AA,OO,YX,MQ,UA |
| Jul 2025 | 288 | 108 | 3 | 1 | AA,OO,UA,YX,MQ |
| Jun 2025 | 293 | 92 | 2 | 0 | AA,OO,UA,YX,MQ |
| May 2025 | 284 | 53 | 2 | 0 | AA,OO,UA,YX,MQ |
| Apr 2025 | 265 | 49 | 3 | 1 | MQ,OO,UA,YX,AA |
| Mar 2025 | 228 | 45 | 4 | 0 | AA,YX,OO,UA,MQ |
| Feb 2025 | 163 | 34 | 1 | 0 | AA,OO,UA,YX,MQ |
| Jan 2025 | 150 | 25 | 9 | 0 | AA,OO,UA,YX,MQ |
| Dec 2024 | 174 | 23 | 1 | 0 | AA,MQ,OO,UA,YX |
| Nov 2024 | 211 | 37 | 0 | 0 | OO,YX,UA,MQ,AA |
| Oct 2024 | 248 | 25 | 0 | 0 | UA,MQ,OO,YX,AA |
| Sep 2024 | 220 | 36 | 1 | 0 | YX,OO,UA,AA,MQ |
| Aug 2024 | 251 | 69 | 0 | 0 | AA,MQ,OO,UA |
| Jul 2024 | 238 | 77 | 3 | 0 | AA,MQ,OO,UA,YX |
| Jun 2024 | 235 | 62 | 3 | 0 | AA,MQ,OO,UA,YX |
| May 2024 | 246 | 70 | 3 | 1 | AA,MQ,YX,OO,UA |
| Apr 2024 | 260 | 42 | 0 | 2 | AA,MQ,UA,YX |
| Mar 2024 | 204 | 40 | 0 | 0 | AA,MQ,YX,OO,UA |
| Feb 2024 | 166 | 17 | 1 | 1 | AA,MQ,OO,UA,YX |
| Jan 2024 | 172 | 45 | 19 | 1 | AA,MQ,YX,OO,UA |
Cancellation Rate
1.5%
84 of 5,546 flights
Diversion Rate
0.1%
8 of 5,546 flights
Explore origin & destination
On-time and delay data for the airports this route connects.
ORD - 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 ORD 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 ORD–STL.
Routes with a similar on-time rate
What the Data Says About ORD to STL
13,359 tracked flights put the ORD to STL pairing (Chicago to St. Louis) at a 79.7% on-time rate, squarely in line with the wider network. Delays that do occur run 73.2 minutes on average. Across the 258-mile route and its 40 carriers, the trailing 24 months show 1.5% cancelled and 0.1% diverted (5,546 flights sampled).
The monthly split is wide on this route: Oct 2024 posted the strongest performance at 90% on-time, while Dec 2025 came in at just 61% - a 29-point swing worth factoring into travel timing.
Frequently Asked Questions
How often are flights delayed from ORD to STL? ▼
What is the cancellation rate for ORD to STL? ▼
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Flight Guides
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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.