Airports › St. Louis (STL) › September 2023
Airport month · September 2023
St Louis Lambert International in September 2023
BTS: A flight is counted as on time if it arrived less than 15 minutes after its scheduled time. Only carriers with at least 0.5 percent of domestic scheduled passenger revenue report.
In September 2023, reporting carriers scheduled 5,346 domestic departures from St Louis Lambert International (STL). 80.4% left less than 15 minutes late and 80.2% reached their destination on time; 0.8% were cancelled.
Nationally that month, 80.5% of flights departed on time and 80.1% arrived on time, so STL departures were level with the national departure figure.
Flights arriving at STL that month were on time 82.0% of the time (5,348 scheduled arrivals).
Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 40%, air carrier 37% and national aviation system 19%.
- On time 80.2%
- Arrived 15+ minutes late 18.7%
- Cancelled 0.8%
- Diverted 0.3%
September 2023 against a year earlier, the airport's year and the nation
| Measure | Sep 2023 | Year earlier | STL, 12 months to Jul 2026 | All reported flights, Sep 2023 |
|---|---|---|---|---|
| Departed on time | 80.4% | — | 74.1% | 80.5% |
| Arrived on time | 80.2% | — | 76.8% | 80.1% |
| Cancelled | 0.8% | — | 1.3% | 1.2% |
| Average departure delay (late minutes only) | 13.0 min | — | 17.6 min | 14.1 min |
| Scheduled departures a day | 178 | — | 174 | 18,978 |
| Scheduled departures | 5,346 | — | 63,318 | 569,338 |
Airlines that month
| Reporting carrier | Flights | Share | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| WN Southwest Airlines | 3,363 | 63% | 79.3% | 6.1 min | 0.4% |
| AA American Airlines | 510 | 10% | 78.2% | 16.3 min | 0.8% |
| DL Delta Air Lines | 485 | 9% | 89.9% | 2.3 min | 0.2% |
| UA United Airlines | 245 | 5% | 81.6% | 5.3 min | 0.8% |
| YX Republic Airline | 183 | 3% | 80.9% | -3.2 min | 6.0% |
| MQ Envoy Air | 133 | 2% | 73.7% | 8.0 min | 0.8% |
| F9 Frontier Airlines | 120 | 2% | 81.7% | -3.2 min | 1.7% |
| AS Alaska Airlines | 85 | 2% | 88.2% | -6.7 min | 1.2% |
| 9E Endeavor Air | 84 | 2% | 77.4% | 2.5 min | 6.0% |
| OO SkyWest Airlines | 79 | 1% | 75.9% | 12.3 min | 1.3% |
| NK Spirit Airlines | 34 | 1% | 58.8% | 21.1 min | 2.9% |
| OH PSA Airlines | 25 | 0% | 88.0% | -7.1 min | 0.0% |
Busiest routes that month
| Route | Cities | Flights | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| STL–DEN | St. Louis to Denver | 360 | 85.0% | 0.4 min | 0.0% |
| STL–LGA | St. Louis to New York | 342 | 74.0% | 6.5 min | 5.8% |
| STL–ATL | St. Louis to Atlanta | 294 | 92.2% | -2.0 min | 0.0% |
| STL–ORD | St. Louis to Chicago | 199 | 74.4% | 7.5 min | 1.0% |
| STL–MCO | St. Louis to Orlando | 192 | 77.6% | 4.1 min | 0.5% |
| STL–DCA | St. Louis to Washington | 191 | 78.5% | 6.9 min | 1.0% |
| STL–DAL | St. Louis to Dallas | 190 | 83.2% | 4.0 min | 0.0% |
| STL–LAS | St. Louis to Las Vegas | 186 | 70.4% | 9.8 min | 1.6% |
| STL–MDW | St. Louis to Chicago | 185 | 83.8% | 2.8 min | 0.5% |
| STL–DTW | St. Louis to Detroit | 166 | 84.3% | 6.1 min | 0.0% |
| STL–DFW | St. Louis to Dallas/Fort Worth | 164 | 81.1% | 4.3 min | 0.0% |
| STL–MSP | St. Louis to Minneapolis | 162 | 88.3% | 0.2 min | 0.0% |
By scheduled departure hour
Delay causes
Questions and answers
How many flights left STL on time in September 2023?
80.4% of 5,346 scheduled domestic departures left less than 15 minutes late, and 80.2% reached their destination on time. The national figures that month were 80.5% and 80.1%.
How does that compare with a year earlier?
September 2022 is outside the 36 months on file, or the airport had too few reported flights that month.
Provenance
Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for September 2023; public domain. Domestic scheduled flights by reporting carriers, totals and averages only. The site's data runs through July 2026. Full record for STL · methodology · corrections.