Route
STL → MSY
St. Louis Lambert International Airport Louis Armstrong New Orleans International Airport
How punctual is this route?
- On-time arrivals
- 82.8%
- Less than 15 minutes late
- Cancelled
- 0.1%
- Of scheduled flights
- Average delay when late
- 63 min
- Flights arriving 15+ minutes late
- Flights tracked
- 734
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 70%
- Airline (crew, maintenance, cleaning) 16%
- Air traffic control & airport 11%
- Extreme weather 2%
- Security 2%
Share of delay minutes airlines attributed to each cause (BTS).
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 93.6% | 47 |
| October 2025 | 79.3% | 82 |
| November 2025 | 82.5% | 57 |
| December 2025 | 85.2% | 61 |
| January 2026 | 88.9% | 63 |
| February 2026 | 91.5% | 71 |
| March 2026 | 79.1% | 68 |
| April 2026 | 88.5% | 61 |
| May 2026 | 82.0% | 61 |
| June 2026 | 69.1% | 56 |
| July 2026 | 74.1% | 58 |
| August 2026 | 79.6% | 49 |
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 | 734 | 82.8% | 0.1% | 63 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
-
WN4500
9% late · 57 flights
-
WN3964
50% late · 52 flights
-
WN4780
8% late · 52 flights
-
WN3809
10% late · 50 flights
-
WN4501
22% late · 50 flights
-
WN1145
6% late · 47 flights
-
WN1137
13% late · 46 flights
-
WN623
15% late · 33 flights
-
WN725
31% late · 33 flights
-
WN2501
6% late · 31 flights
-
WN2557
4% late · 26 flights
-
WN2151
4% late · 24 flights
-
WN3870
12% late · 24 flights
-
WN3036
24% late · 21 flights
-
WN4005
25% late · 20 flights
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