Which departure time was most reliable for STL to DCA?
Among qualifying STL-to-DCA departure window results, Early morning had the highest on-time rate: 83.8% of 718 flights. Evening was lowest at 57.0% across 551 flights.
| Departure window | Flights | On time | 30+ min | Cancelled |
|---|---|---|---|---|
| Early morning | 718 | 83.8% | 7.0% | 2.8% |
| Late morning | 270 | 75.2% | 15.6% | 2.2% |
| Afternoon | 875 | 66.4% | 20.1% | 2.6% |
| Evening | 551 | 57.0% | 27.2% | 2.7% |
Which weekday was most reliable for STL to DCA?
Among qualifying STL-to-DCA weekday results, Saturday had the highest on-time rate: 80.2% of 217 flights. Sunday was lowest at 62.6% across 321 flights.
| Day | Flights | On time | 30+ min | Cancelled |
|---|---|---|---|---|
| Monday | 375 | 64.5% | 20.5% | 4.3% |
| Tuesday | 384 | 76.8% | 13.5% | 1.6% |
| Wednesday | 376 | 75.5% | 15.7% | 1.6% |
| Thursday | 370 | 67.8% | 20.3% | 1.6% |
| Friday | 371 | 68.2% | 18.1% | 3.2% |
| Saturday | 217 | 80.2% | 10.1% | 2.3% |
| Sunday | 321 | 62.6% | 20.6% | 4.0% |
Which airline was most reliable for STL to DCA?
Among qualifying STL-to-DCA airline results, Republic Airways had the highest on-time rate: 74.4% of 199 flights. American Airlines was lowest at 65.1% across 175 flights.
| Airline | Flights | On time | 30+ min | Cancelled |
|---|---|---|---|---|
| Southwest Airlines | 1,403 | 71.0% | 17.5% | 1.4% |
| PSA Airlines | 615 | 69.3% | 17.1% | 5.2% |
| Republic Airways | 199 | 74.4% | 14.1% | 3.5% |
| American Airlines | 175 | 65.1% | 21.7% | 2.9% |
| Envoy Air | 22 | 72.7% | 9.1% | 0.0% |
Which month was most reliable for STL to DCA?
Among qualifying STL-to-DCA month results, April 2026 had the highest on-time rate: 81.3% of 193 flights. July 2025 was lowest at 53.5% across 200 flights.
| Month | Flights | On time | 30+ min | Cancelled |
|---|---|---|---|---|
| July 2025 | 200 | 53.5% | 25.5% | 7.0% |
| August 2025 | 197 | 71.6% | 20.3% | 1.0% |
| September 2025 | 217 | 76.0% | 13.4% | 0.5% |
| October 2025 | 223 | 78.9% | 13.9% | 0.0% |
| November 2025 | 208 | 71.2% | 18.3% | 2.9% |
| December 2025 | 203 | 73.4% | 16.3% | 2.0% |
| January 2026 | 199 | 69.3% | 14.6% | 8.5% |
| February 2026 | 179 | 70.4% | 18.4% | 2.8% |
| March 2026 | 200 | 64.5% | 22.0% | 3.0% |
| April 2026 | 193 | 81.3% | 10.4% | 0.0% |
| May 2026 | 197 | 72.1% | 13.7% | 1.5% |
| June 2026 | 198 | 61.6% | 21.7% | 3.0% |
What drove STL to DCA delay minutes?
Late aircraft was the largest recorded STL-to-DCA delay category, accounting for 39.3% of 47,775 BTS-attributed delay minutes during July 2025–June 2026.
Weather, schedules and operations change. For a trip you have already booked, use the airline or airport for live status.