Route
STL → AUS
St. Louis Lambert International Airport Austin Bergstrom International Airport
How punctual is this route?
- On-time arrivals
- 75.2%
- Less than 15 minutes late
- Cancelled
- 0.3%
- Of scheduled flights
- Average delay when late
- 59 min
- Flights arriving 15+ minutes late
- Flights tracked
- 972
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 64%
- Airline (crew, maintenance, cleaning) 22%
- Air traffic control & airport 13%
- Extreme weather 2%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 89.0% | 73 |
| October 2025 | 73.5% | 83 |
| November 2025 | 77.6% | 85 |
| December 2025 | 70.3% | 91 |
| January 2026 | 90.2% | 63 |
| February 2026 | 81.4% | 59 |
| March 2026 | 82.4% | 86 |
| April 2026 | 79.8% | 89 |
| May 2026 | 67.0% | 92 |
| June 2026 | 62.8% | 86 |
| July 2026 | 64.0% | 89 |
| August 2026 | 73.7% | 76 |
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 | 972 | 75.2% | 0.3% | 59 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
-
WN3884
12% late · 60 flights
-
WN4515
48% late · 60 flights
-
WN4420
31% late · 59 flights
-
WN1262
12% late · 58 flights
-
WN1774
44% late · 58 flights
-
WN3743
16% late · 50 flights
-
WN4432
31% late · 49 flights
-
WN1316
11% late · 47 flights
-
WN4545
20% late · 46 flights
-
WN1353
25% late · 40 flights
-
WN562
16% late · 33 flights
-
WN463
6% late · 31 flights
-
WN329
48% late · 27 flights
-
WN4157
19% late · 27 flights
-
WN2019
24% late · 25 flights
-
WN4589
12% late · 25 flights
-
WN2158
12% late · 24 flights
-
WN3569
21% late · 24 flights
-
WN2850
43% late · 23 flights
-
WN494
23% late · 22 flights
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