Route
RDU → STL
Raleigh-Durham International Airport St. Louis Lambert International Airport
How punctual is this route?
- On-time arrivals
- 80.4%
- Less than 15 minutes late
- Cancelled
- 0.3%
- Of scheduled flights
- Average delay when late
- 59 min
- Flights arriving 15+ minutes late
- Flights tracked
- 664
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 63%
- Airline (crew, maintenance, cleaning) 22%
- Air traffic control & airport 10%
- Extreme weather 4%
- Security 2%
Share of delay minutes airlines attributed to each cause (BTS).
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 94.2% | 52 |
| October 2025 | 91.4% | 58 |
| November 2025 | 86.2% | 58 |
| December 2025 | 86.7% | 60 |
| January 2026 | 90.3% | 32 |
| February 2026 | 82.4% | 34 |
| March 2026 | 84.5% | 59 |
| April 2026 | 76.2% | 63 |
| May 2026 | 80.0% | 65 |
| June 2026 | 65.0% | 60 |
| July 2026 | 62.3% | 61 |
| August 2026 | 74.2% | 62 |
Source: U.S. DOT Bureau of Transportation Statistics on-time data, September 2025 – August 2026. Covers flights operated by reporting U.S. carriers. About our data
Airlines on this route
| Airline | Flights | On time | Cancelled | Avg. delay when late |
|---|---|---|---|---|
| Southwest Airlines | 664 | 80.4% | 0.3% | 59 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
-
WN4544
11% late · 64 flights
-
WN3435
7% late · 60 flights
-
WN3457
67% late · 60 flights
-
WN3046
3% late · 58 flights
-
WN4002
42% late · 57 flights
-
WN4312
6% late · 33 flights
-
WN452
31% late · 33 flights
-
WN4154
3% late · 31 flights
-
WN4314
3% late · 31 flights
-
WN1295
10% late · 29 flights
-
WN3357
4% late · 28 flights
-
WN623
4% late · 28 flights
-
WN523
24% late · 22 flights
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