St. Louis (STL) to Raleigh/Durham (RDU): On-Time Performance
Data through July 2026
When you fly STL to RDU matters as much as anything else about the booking: the route swung from 97% on-time in February 2026 to just 62% in July 2026. Across the full period the route averages 83% on-time against a national 78%. Morning departures also hold up better than evening ones (92% vs 74%), which matters most in the rough months.
- On-time
- 83%
- arrived <15 min late
- Avg delay
- 11 min
- completed flights
- Cancelled
- 0.3%
- Flights/day
- 1.8
- last 12 months
- Duration
- 1h 50m
- scheduled
- Distance
- 668 mi
Monthly on-time trend
Best time to fly from STL to RDU
Aim for departures around 7 a.m. (95% on-time); avoid 8 p.m. departures (66%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 81% | 14 min |
| Tuesday | 90% | 8 min |
| Wednesdaybest | 91% | 7 min |
| Thursday | 82% | 9 min |
| Friday | 82% | 11 min |
| Saturday | 80% | 12 min |
| Sunday | 74% | 15 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft60%
- Airline operations31%
- National airspace system7%
- Weather2%
Frequently asked questions
- How often are flights from STL to RDU delayed?
- 17% of STL–RDU flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-07 and 2026-07. The average arrival delay across completed flights was 11 minutes.
- What is the best time of day to fly from STL to RDU?
- Departures around 7 a.m. have the best record (95% on-time), while departures around 8 p.m. have the worst (66%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from STL to RDU?
- The scheduled STL–RDU flight time averages 1h 50m over 668 miles. Actual arrival times vary — flights on this route land 15+ minutes late 17% of the time.
- How often are STL to RDU flights cancelled?
- 0.3% of scheduled flights on this route were cancelled between 2024-07 and 2026-07, at or below the national rate of 1.6%.
- What is the worst month to fly from STL to RDU?
- July 2026 was the roughest month in this dataset, with only 62% of arrivals on time. The best was February 2026 at 97%. If your dates are flexible, that 35-point gap is worth planning around.
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Based on 1,363 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.