Best Time to Fly STL to RDU: On-Time Stats by Hour & Airline
St Louis Lambert International → Raleigh-Durham International
Data through July 2026 · Last updated October 18, 2026
655 flights were scheduled from St. Louis (STL) to Raleigh/Durham (RDU) in the last 12 months, and 80.9% of those that flew arrived on time, 3.3 points above the US average of 77.6%.
Southwest Airlines was the only reporting airline with regular flights on this route.
February has been the best month (93% on time) and Sunday the weakest day of the week (74%).
0.1% of flights were cancelled, versus 1.8% nationally.
STL to RDU 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 | 80.9% | 56 min | 0.1% | 655 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly STL to RDU
On-time arrival % by scheduled departure hour (local time), 1,301 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 7am–8am | 95.0% | 0.0% | 161 |
| 8am–9am | 91.2% | 0.8% | 241 |
| 9am–10am | 92.6% | 1.0% | 96 |
| 10am–11am | 90.5% | 0.0% | 126 |
| 11am–12pm | Limited data | 1 | |
| 12pm–1pm | Limited data | 18 | |
| 1pm–2pm | Limited data | 7 | |
| 2pm–3pm | Limited data | 1 | |
| 3pm–4pm | Limited data | 26 | |
| 4pm–5pm | Limited data | 18 | |
| 5pm–6pm | Limited data | 21 | |
| 6pm–7pm | 87.3% | 0.0% | 165 |
| 7pm–8pm | 70.0% | 0.0% | 203 |
| 8pm–9pm | 66.8% | 0.5% | 194 |
| 9pm–10pm | Limited data | 23 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on STL to RDU
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) | 78.3% | -7.9 pts | 0.0% | 60 |
| Summer peak (Jun 15 - Aug 15) | 75.1% | -11.1 pts | 0.0% | 237 |
| All other days | 86.2% | — | 0.4% | 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).