Which departure time was most reliable for STL to BOS?
Among qualifying STL-to-BOS departure window results, Early morning had the highest on-time rate: 90.0% of 201 flights. Afternoon was lowest at 59.4% across 404 flights.
| Departure window | Flights | On time | 30+ min | Cancelled |
|---|---|---|---|---|
| Early morning | 201 | 90.0% | 3.5% | 1.5% |
| Late morning | 422 | 80.3% | 11.6% | 0.9% |
| Afternoon | 404 | 59.4% | 28.7% | 2.0% |
| Evening | 578 | 60.9% | 26.0% | 1.4% |
Which weekday was most reliable for STL to BOS?
Among qualifying STL-to-BOS weekday results, Friday had the highest on-time rate: 75.8% of 240 flights. Sunday was lowest at 63.0% across 243 flights.
| Day | Flights | On time | 30+ min | Cancelled |
|---|---|---|---|---|
| Monday | 244 | 65.2% | 23.0% | 2.5% |
| Tuesday | 235 | 75.3% | 13.2% | 0.4% |
| Wednesday | 229 | 71.6% | 17.9% | 0.4% |
| Thursday | 239 | 64.9% | 24.7% | 0.8% |
| Friday | 240 | 75.8% | 17.5% | 0.0% |
| Saturday | 180 | 69.4% | 17.8% | 1.7% |
| Sunday | 243 | 63.0% | 25.5% | 4.5% |
Which airline was most reliable for STL to BOS?
Among qualifying STL-to-BOS airline results, Envoy Air had the highest on-time rate: 74.6% of 418 flights. Southwest Airlines was lowest at 65.6% across 934 flights.
| Airline | Flights | On time | 30+ min | Cancelled |
|---|---|---|---|---|
| Southwest Airlines | 934 | 65.6% | 22.1% | 1.0% |
| Envoy Air | 418 | 74.6% | 18.4% | 1.7% |
| Republic Airways | 258 | 73.6% | 15.5% | 3.1% |
Which month was most reliable for STL to BOS?
Among qualifying STL-to-BOS month results, August 2025 had the highest on-time rate: 84.1% of 145 flights. October 2025 was lowest at 53.3% across 150 flights.
| Month | Flights | On time | 30+ min | Cancelled |
|---|---|---|---|---|
| July 2025 | 149 | 63.8% | 22.8% | 2.0% |
| August 2025 | 145 | 84.1% | 12.4% | 0.0% |
| September 2025 | 142 | 69.7% | 20.4% | 0.7% |
| October 2025 | 150 | 53.3% | 30.7% | 0.7% |
| November 2025 | 140 | 75.0% | 18.6% | 1.4% |
| December 2025 | 146 | 79.5% | 13.7% | 0.7% |
| January 2026 | 102 | 76.5% | 10.8% | 5.9% |
| February 2026 | 98 | 77.6% | 10.2% | 7.1% |
| March 2026 | 118 | 61.0% | 24.6% | 1.7% |
| April 2026 | 134 | 67.9% | 20.1% | 0.0% |
| May 2026 | 142 | 64.1% | 25.4% | 0.0% |
| June 2026 | 144 | 62.5% | 25.7% | 0.7% |
What drove STL to BOS delay minutes?
Late aircraft was the largest recorded STL-to-BOS delay category, accounting for 46.9% of 31,322 BTS-attributed delay minutes during July 2025–June 2026.
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