Which departure time was most reliable for STL to SLC?
Among qualifying STL-to-SLC departure window results, Early morning had the highest on-time rate: 90.4% of 365 flights. Evening was lowest at 82.7% across 313 flights.
| Departure window | Flights | On time | 30+ min | Cancelled |
|---|---|---|---|---|
| Early morning | 365 | 90.4% | 5.2% | 0.5% |
| Afternoon | 311 | 85.9% | 10.0% | 0.6% |
| Evening | 313 | 82.7% | 10.2% | 1.3% |
Which weekday was most reliable for STL to SLC?
Among qualifying STL-to-SLC weekday results, Tuesday had the highest on-time rate: 89.8% of 147 flights. Sunday was lowest at 80.7% across 145 flights.
| Day | Flights | On time | 30+ min | Cancelled |
|---|---|---|---|---|
| Monday | 148 | 84.5% | 10.1% | 0.7% |
| Tuesday | 147 | 89.8% | 6.1% | 0.0% |
| Wednesday | 144 | 89.6% | 5.6% | 0.0% |
| Thursday | 146 | 89.7% | 8.9% | 1.4% |
| Friday | 145 | 89.7% | 4.1% | 0.7% |
| Saturday | 114 | 80.7% | 13.2% | 0.0% |
| Sunday | 145 | 80.7% | 11.0% | 2.8% |
Which airline was most reliable for STL to SLC?
Only Delta Air Lines met the STL-to-SLC airline threshold: 86.6% of 978 scheduled flights arrived on time during July 2025–June 2026.
| Airline | Flights | On time | 30+ min | Cancelled |
|---|---|---|---|---|
| Delta Air Lines | 978 | 86.6% | 8.2% | 0.8% |
| Southwest Airlines | 9 | 77.8% | 22.2% | 0.0% |
| SkyWest Airlines | 2 | 100.0% | 0.0% | 0.0% |
Which month was most reliable for STL to SLC?
Among qualifying STL-to-SLC month results, May 2026 had the highest on-time rate: 93.1% of 87 flights. February 2026 was lowest at 76.9% across 65 flights.
| Month | Flights | On time | 30+ min | Cancelled |
|---|---|---|---|---|
| July 2025 | 92 | 90.2% | 4.3% | 0.0% |
| August 2025 | 88 | 87.5% | 5.7% | 1.1% |
| September 2025 | 82 | 90.2% | 4.9% | 1.2% |
| October 2025 | 88 | 88.6% | 4.5% | 0.0% |
| November 2025 | 83 | 88.0% | 8.4% | 0.0% |
| December 2025 | 79 | 77.2% | 16.5% | 1.3% |
| January 2026 | 62 | 88.7% | 3.2% | 3.2% |
| February 2026 | 65 | 76.9% | 20.0% | 0.0% |
| March 2026 | 87 | 86.2% | 9.2% | 2.3% |
| April 2026 | 86 | 86.0% | 11.6% | 0.0% |
| May 2026 | 87 | 93.1% | 3.4% | 1.1% |
| June 2026 | 90 | 83.3% | 10.0% | 0.0% |
What drove STL to SLC delay minutes?
Airline was the largest recorded STL-to-SLC delay category, accounting for 57.2% of 12,526 BTS-attributed delay minutes during July 2025–June 2026.
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