Route · STL → ORD · 2020–2025 BTS data
St. Louis to Chicago
The STL–ORD corridor (St. Louis, MO → Chicago, IL) runs ahead of the national average, served by 37 carriers across roughly 258 miles.
Data updated 2026-06-13
- 80.8%
- On-time
- +1.8 pts
- vs US avg
- 99 min
- Delay when late
- 13,549
- Flights
Cancelled
1.6%
Best Month
Mar 2024 85%
Worst Month
Jul 2025 62%
Distance
258 mi
Carriers
37
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Dec 2025 | 240 | 87 | 7 | 0 | YX,AA,MQ,UA,OO |
| Nov 2025 | 241 | 73 | 11 | 1 | OO,UA,MQ,AA,YX |
| Oct 2025 | 274 | 81 | 0 | 0 | AA,OO,UA,YX,MQ |
| Sep 2025 | 239 | 45 | 2 | 0 | MQ,UA,OO,YX,AA |
| Aug 2025 | 255 | 76 | 10 | 0 | AA,OO,YX,MQ,UA |
| Jul 2025 | 289 | 110 | 5 | 0 | AA,OO,UA,YX,MQ |
| Jun 2025 | 294 | 85 | 3 | 0 | AA,OO,UA,YX,MQ |
| May 2025 | 284 | 59 | 3 | 0 | AA,OO,UA,YX,MQ |
| Apr 2025 | 264 | 56 | 4 | 0 | MQ,OO,UA,YX,AA |
| Mar 2025 | 228 | 50 | 5 | 1 | AA,YX,OO,UA,MQ |
| Feb 2025 | 164 | 29 | 3 | 0 | AA,OO,UA,YX,MQ |
| Jan 2025 | 150 | 31 | 8 | 0 | AA,OO,UA,YX,MQ |
| Dec 2024 | 175 | 34 | 1 | 0 | AA,MQ,OO,UA,YX |
| Nov 2024 | 209 | 50 | 0 | 0 | OO,YX,UA,MQ,AA |
| Oct 2024 | 247 | 37 | 0 | 0 | UA,MQ,OO,YX,AA |
| Sep 2024 | 221 | 44 | 1 | 0 | YX,OO,UA,AA,MQ |
| Aug 2024 | 251 | 74 | 1 | 0 | AA,MQ,OO,UA |
| Jul 2024 | 238 | 80 | 1 | 0 | AA,MQ,OO,UA,YX |
| Jun 2024 | 235 | 64 | 2 | 0 | AA,MQ,OO,UA,YX |
| May 2024 | 245 | 64 | 4 | 1 | AA,MQ,YX,OO,UA |
| Apr 2024 | 259 | 49 | 0 | 0 | AA,MQ,UA,YX |
| Mar 2024 | 204 | 30 | 0 | 0 | AA,MQ,YX,OO,UA |
| Feb 2024 | 166 | 26 | 1 | 0 | AA,MQ,OO,UA,YX |
| Jan 2024 | 172 | 53 | 16 | 0 | AA,MQ,YX,OO,UA |
Cancellation Rate
1.6%
88 of 5,544 flights
Diversion Rate
0.1%
3 of 5,544 flights
Explore origin & destination
On-time and delay data for the airports this route connects.
STL - St. Louis
Full on-time, delay-cause, and seasonal performance for St. Louis, MO.
Origin airport →ORD - Chicago
Full on-time, delay-cause, and seasonal performance for Chicago, IL.
Destination airport →Compare the two airports
See STL and ORD side by side on delays, cancellations, and reliability.
Open comparison tool →Similar routes
Other BTS-tracked routes with comparable performance or trip length to STL–ORD.
Routes with a similar on-time rate
What the Data Says About STL to ORD
13,549 tracked flights put the STL to ORD pairing (St. Louis to Chicago) at a 80.8% on-time rate, squarely in line with the wider network. Delays that do occur run 99.1 minutes on average. Across the 258-mile route and its 37 carriers, the trailing 24 months show 1.6% cancelled and 0.1% diverted (5,544 flights sampled).
The monthly split is wide on this route: Mar 2024 posted the strongest performance at 85% on-time, while Jul 2025 came in at just 62% - a 23-point swing worth factoring into travel timing.
Frequently Asked Questions
How often are flights delayed from STL to ORD? ▼
What is the cancellation rate for STL to ORD? ▼
How far is the flight from STL to ORD? ▼
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Flight Guides
Tips and data-driven advice for choosing reliable routes.
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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.