Best Time to Fly RDU to STL: On-Time Stats by Hour & Airline
Raleigh-Durham International → St Louis Lambert International
Data through July 2026 · Last updated October 18, 2026
655 flights were scheduled from Raleigh/Durham (RDU) to St. Louis (STL) in the last 12 months, and 81.3% of those that flew arrived on time, 3.7 points above the US average of 77.6%.
Southwest Airlines was the only reporting airline with regular flights on this route.
September has been the best month (93% on time) and Thursday the weakest day of the week (76%).
0.3% of flights were cancelled, versus 1.8% nationally.
RDU to STL on-time performance by airline
Last 12 months. Airlines with fewer than 30 completed flights are marked “limited data”.
| Airline | On time | Avg delay when late | Cancelled | Flights |
|---|---|---|---|---|
| Southwest Airlines | 81.3% | 51 min | 0.3% | 655 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly RDU to STL
On-time arrival % by scheduled departure hour (local time), 1,301 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | Limited data | 1 | |
| 6am–7am | 94.7% | 0.0% | 150 |
| 7am–8am | 93.8% | 1.0% | 195 |
| 8am–9am | 97.0% | 0.5% | 199 |
| 9am–10am | 91.5% | 0.0% | 48 |
| 10am–11am | Limited data | 11 | |
| 11am–12pm | 90.9% | 0.0% | 33 |
| 12pm–1pm | 84.4% | 0.0% | 32 |
| 1pm–2pm | 84.8% | 0.0% | 33 |
| 2pm–3pm | Limited data | 18 | |
| 4pm–5pm | Limited data | 1 | |
| 5pm–6pm | 78.2% | 0.0% | 78 |
| 6pm–7pm | 85.2% | 0.8% | 123 |
| 7pm–8pm | 56.4% | 0.5% | 204 |
| 8pm–9pm | 72.2% | 1.1% | 175 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on RDU to STL
On-time arrivals during holiday periods compared with all other days, last 24 months.
| Period | On time | vs other days | Cancelled | Flights |
|---|---|---|---|---|
| Thanksgiving week (Tue before to Mon after) | Limited data | 27 | ||
| Christmas & New Year (Dec 20 - Jan 3) | 86.7% | +0.7 pts | 0.0% | 60 |
| Summer peak (Jun 15 - Aug 15) | 72.5% | -13.5 pts | 0.4% | 237 |
| All other days | 86.0% | — | 0.6% | 977 |
Monthly on-time trend
On-time arrival % each month, with the 12-month US average for reference.
What causes delays on this route
Share of reported delay minutes, last 12 months (BTS cause categories).