Which departure time was most reliable for STL to SFO?
Among qualifying STL-to-SFO departure window results, Late morning had the highest on-time rate: 76.0% of 183 flights. Early morning was lowest at 53.5% across 228 flights.
| Departure window | Flights | On time | 30+ min | Cancelled |
|---|---|---|---|---|
| Early morning | 228 | 53.5% | 32.9% | 1.3% |
| Late morning | 183 | 76.0% | 13.1% | 0.0% |
| Afternoon | 46 | 65.2% | 23.9% | 0.0% |
| Evening | 325 | 60.6% | 28.9% | 1.2% |
Which weekday was most reliable for STL to SFO?
Among qualifying STL-to-SFO weekday results, Tuesday had the highest on-time rate: 72.9% of 107 flights. Sunday was lowest at 56.2% across 121 flights.
| Day | Flights | On time | 30+ min | Cancelled |
|---|---|---|---|---|
| Monday | 121 | 57.0% | 36.4% | 0.8% |
| Tuesday | 107 | 72.9% | 14.0% | 0.0% |
| Wednesday | 112 | 60.7% | 25.9% | 0.0% |
| Thursday | 115 | 59.1% | 31.3% | 0.0% |
| Friday | 120 | 65.0% | 26.7% | 0.8% |
| Saturday | 86 | 68.6% | 18.6% | 2.3% |
| Sunday | 121 | 56.2% | 26.4% | 2.5% |
Which airline was most reliable for STL to SFO?
Among qualifying STL-to-SFO airline results, United Airlines had the highest on-time rate: 63.3% of 207 flights. SkyWest Airlines was lowest at 61.8% across 233 flights.
| Airline | Flights | On time | 30+ min | Cancelled |
|---|---|---|---|---|
| Southwest Airlines | 342 | 62.3% | 25.4% | 0.3% |
| SkyWest Airlines | 233 | 61.8% | 26.2% | 2.1% |
| United Airlines | 207 | 63.3% | 27.1% | 0.5% |
Which month was most reliable for STL to SFO?
Among qualifying STL-to-SFO month results, January 2026 had the highest on-time rate: 85.5% of 69 flights. June 2026 was lowest at 18.3% across 60 flights.
| Month | Flights | On time | 30+ min | Cancelled |
|---|---|---|---|---|
| July 2025 | 83 | 59.0% | 25.3% | 1.2% |
| August 2025 | 63 | 76.2% | 12.7% | 1.6% |
| September 2025 | 60 | 80.0% | 10.0% | 0.0% |
| October 2025 | 62 | 58.1% | 27.4% | 0.0% |
| November 2025 | 57 | 78.9% | 17.5% | 0.0% |
| December 2025 | 60 | 71.7% | 21.7% | 0.0% |
| January 2026 | 69 | 85.5% | 7.2% | 2.9% |
| February 2026 | 60 | 68.3% | 20.0% | 0.0% |
| March 2026 | 60 | 85.0% | 8.3% | 1.7% |
| April 2026 | 77 | 44.2% | 33.8% | 2.6% |
| May 2026 | 71 | 32.4% | 59.2% | 0.0% |
| June 2026 | 60 | 18.3% | 65.0% | 0.0% |
What drove STL to SFO delay minutes?
National airspace was the largest recorded STL-to-SFO delay category, accounting for 49.8% of 20,534 BTS-attributed delay minutes during July 2025–June 2026.
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