Route
STL → SAT
St. Louis Lambert International Airport San Antonio International Airport
How punctual is this route?
- On-time arrivals
- 81.3%
- Less than 15 minutes late
- Cancelled
- 0.0%
- Of scheduled flights
- Average delay when late
- 54 min
- Flights arriving 15+ minutes late
- Flights tracked
- 557
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 59%
- Airline (crew, maintenance, cleaning) 30%
- Air traffic control & airport 8%
- Extreme weather 2%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 87.2% | 47 |
| October 2025 | 86.5% | 53 |
| November 2025 | 90.9% | 33 |
| December 2025 | 72.5% | 40 |
| January 2026 | 92.9% | 29 |
| February 2026 | 92.3% | 27 |
| March 2026 | 81.5% | 54 |
| April 2026 | 85.7% | 56 |
| May 2026 | 81.8% | 56 |
| June 2026 | 56.9% | 52 |
| July 2026 | 79.6% | 54 |
| August 2026 | 80.4% | 56 |
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 | 557 | 81.3% | 0.0% | 54 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
-
WN2599
7% late · 57 flights
-
WN3979
38% late · 51 flights
-
WN4517
29% late · 49 flights
-
WN2802
11% late · 46 flights
-
WN2163
13% late · 31 flights
-
WN2136
4% late · 28 flights
-
WN3978
26% late · 27 flights
-
WN4410
11% late · 27 flights
-
WN1972
22% late · 23 flights
-
WN4166
18% late · 22 flights
-
WN1902
10% late · 21 flights
-
WN442
20% late · 20 flights
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