STL · St. Louis Lambert International Airport
St. Louis, MO. All airports.
Share of flights 15+ min late, by month
departures
arrivals
usual for the month (departures)
Jan 2015 → Jul 2026; gridlines 10/20/30/40%
Recent months — departures
| Month | Flights | Late 15+ | vs usual | Cancelled | Avg min | Main cause |
|---|---|---|---|---|---|---|
| Jul 2026 | 5,725 | 33.6% | +3.1 | 1.8% | 23 | Late aircraft |
| Jun 2026 | 5,463 | 33.3% | +4.8 | 1.2% | 23 | Late aircraft |
| May 2026 | 5,375 | 26.2% | +3.1 | 0.8% | 19 | Late aircraft |
| Apr 2026 | 5,156 | 20.9% | +0.9 | 0.8% | 14 | Late aircraft |
| Mar 2026 | 5,400 | 29.0% | +7.6 | 2.5% | 21 | Late aircraft |
| Feb 2026 | 4,484 | 18.7% | +1.8 | 1.3% | 13 | Airline |
| Jan 2026 | 4,683 | 19.2% | +0.3 | 3.5% | 14 | Airline |
| Dec 2025 | 5,359 | 30.0% | +7.5 | 0.9% | 21 | Late aircraft |
| Nov 2025 | 5,202 | 22.5% | +7.5 | 1.5% | 17 | Late aircraft |
| Oct 2025 | 5,611 | 23.5% | +5.4 | 0.3% | 15 | Late aircraft |
| Sep 2025 | 5,321 | 17.3% | +3.2 | 0.3% | 11 | Late aircraft |
| Aug 2025 | 5,539 | 22.4% | -1.7 | 1.0% | 16 | Late aircraft |
| Jul 2025 | 5,855 | 30.5% | +0.3 | 1.6% | 23 | Late aircraft |
| Jun 2025 | 5,733 | 27.7% | -0.9 | 1.0% | 21 | Late aircraft |
| May 2025 | 5,628 | 23.1% | -0.4 | 1.2% | 16 | Late aircraft |
| Apr 2025 | 5,439 | 19.5% | -3.1 | 0.8% | 14 | Late aircraft |
| Mar 2025 | 5,379 | 19.4% | -2.1 | 0.9% | 14 | Late aircraft |
| Feb 2025 | 4,419 | 16.8% | -0.2 | 1.0% | 12 | Late aircraft |
| Jan 2025 | 4,717 | 17.5% | -2.0 | 6.9% | 13 | Late aircraft |
| Dec 2024 | 5,384 | 22.4% | -0.6 | 0.4% | 15 | Late aircraft |
| Nov 2024 | 5,263 | 13.9% | -2.7 | 0.1% | 9 | Late aircraft |
| Oct 2024 | 5,762 | 13.2% | -4.9 | 0.8% | 8 | Late aircraft |
| Sep 2024 | 5,496 | 13.3% | -2.5 | 0.5% | 8 | Late aircraft |
| Aug 2024 | 5,749 | 20.2% | -4.3 | 1.4% | 14 | Late aircraft |
Airlines here, Dec 2025 (departures)
| Airline | Flights | Late | Canc. |
|---|---|---|---|
| PSA | 96 | 20.7% | 4.2% |
| Delta | 430 | 22.4% | 2.6% |
| American | 396 | 22.5% | 0.3% |
| Envoy | 126 | 26.0% | 2.4% |
| United | 180 | 26.7% | 0.0% |
| Republic | 341 | 27.4% | 2.6% |
| Alaska | 54 | 28.3% | 1.9% |
| Southwest | 3,453 | 31.8% | 0.3% |
| Frontier | 114 | 33.0% | 1.8% |
| SkyWest | 159 | 42.5% | 3.8% |
Airlines with 30+ departures that month.
Worst days on record
| Date | Flights | Late | Canc. |
|---|---|---|---|
| 2025-01-05 | 180 | 94% | 73% |
| 2025-01-06 | 162 | 92% | 62% |
| 2022-02-02 | 146 | 47% | 88% |
| 2022-12-23 | 162 | 86% | 40% |
| 2022-02-03 | 157 | 30% | 87% |
| 2022-12-24 | 128 | 84% | 41% |
| 2025-11-29 | 179 | 84% | 11% |
| 2016-12-18 | 152 | 82% | 10% |
| 2023-01-11 | 157 | 76% | 11% |
| 2024-01-22 | 168 | 58% | 46% |
| 2022-12-25 | 137 | 63% | 39% |
| 2022-12-26 | 159 | 53% | 52% |
Departures; ranked by share late or cancelled.
FAA programs, last 90 days
None recorded.