Which departure time was most reliable for BOS to STL?
Among qualifying BOS-to-STL departure window results, Early morning had the highest on-time rate: 91.7% of 651 flights. Evening was lowest at 47.3% across 334 flights.
| Departure window | Flights | On time | 30+ min | Cancelled |
|---|---|---|---|---|
| Early morning | 651 | 91.7% | 4.6% | 1.1% |
| Late morning | 185 | 84.3% | 9.2% | 2.7% |
| Afternoon | 441 | 67.8% | 19.3% | 0.9% |
| Evening | 334 | 47.3% | 35.3% | 1.8% |
Which weekday was most reliable for BOS to STL?
Among qualifying BOS-to-STL weekday results, Saturday had the highest on-time rate: 82.9% of 181 flights. Sunday was lowest at 65.8% across 243 flights.
| Day | Flights | On time | 30+ min | Cancelled |
|---|---|---|---|---|
| Monday | 244 | 72.5% | 16.4% | 2.9% |
| Tuesday | 234 | 79.1% | 10.7% | 0.9% |
| Wednesday | 230 | 80.0% | 13.9% | 0.9% |
| Thursday | 239 | 69.5% | 20.5% | 1.7% |
| Friday | 240 | 78.3% | 15.0% | 0.0% |
| Saturday | 181 | 82.9% | 11.0% | 0.6% |
| Sunday | 243 | 65.8% | 19.8% | 2.5% |
Which airline was most reliable for BOS to STL?
Among qualifying BOS-to-STL airline results, Envoy Air had the highest on-time rate: 80.9% of 418 flights. Southwest Airlines was lowest at 71.4% across 935 flights.
| Airline | Flights | On time | 30+ min | Cancelled |
|---|---|---|---|---|
| Southwest Airlines | 935 | 71.4% | 17.3% | 1.0% |
| Envoy Air | 418 | 80.9% | 14.4% | 1.2% |
| Republic Airways | 258 | 79.1% | 10.9% | 3.1% |
Which month was most reliable for BOS to STL?
Among qualifying BOS-to-STL month results, November 2025 had the highest on-time rate: 84.5% of 142 flights. October 2025 was lowest at 64.0% across 150 flights.
| Month | Flights | On time | 30+ min | Cancelled |
|---|---|---|---|---|
| July 2025 | 149 | 71.1% | 18.8% | 1.3% |
| August 2025 | 145 | 81.4% | 13.8% | 0.0% |
| September 2025 | 142 | 70.4% | 18.3% | 1.4% |
| October 2025 | 150 | 64.0% | 26.0% | 0.7% |
| November 2025 | 142 | 84.5% | 9.2% | 0.7% |
| December 2025 | 146 | 71.2% | 16.4% | 0.7% |
| January 2026 | 102 | 82.4% | 6.9% | 5.9% |
| February 2026 | 98 | 80.6% | 11.2% | 7.1% |
| March 2026 | 118 | 68.6% | 16.1% | 0.8% |
| April 2026 | 133 | 84.2% | 10.5% | 0.0% |
| May 2026 | 142 | 76.8% | 16.9% | 0.0% |
| June 2026 | 144 | 70.1% | 17.4% | 0.7% |
What drove BOS to STL delay minutes?
Late aircraft was the largest recorded BOS-to-STL delay category, accounting for 62.4% of 23,331 BTS-attributed delay minutes during July 2025–June 2026.
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