Route
SAT → STL
San Antonio International Airport St. Louis Lambert International Airport
How punctual is this route?
- On-time arrivals
- 84.5%
- Less than 15 minutes late
- Cancelled
- 0.0%
- Of scheduled flights
- Average delay when late
- 59 min
- Flights arriving 15+ minutes late
- Flights tracked
- 557
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 55%
- Airline (crew, maintenance, cleaning) 35%
- 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 | 93.6% | 47 |
| October 2025 | 90.6% | 53 |
| November 2025 | 78.8% | 33 |
| December 2025 | 85.0% | 40 |
| January 2026 | 89.7% | 29 |
| February 2026 | 88.9% | 27 |
| March 2026 | 77.8% | 54 |
| April 2026 | 89.3% | 56 |
| May 2026 | 89.1% | 56 |
| June 2026 | 67.3% | 52 |
| July 2026 | 88.9% | 54 |
| August 2026 | 78.6% | 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 | 84.5% | 0.0% | 59 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
-
WN4809
10% late · 51 flights
-
WN4175
17% late · 42 flights
-
WN1436
12% late · 34 flights
-
WN4404
9% late · 33 flights
-
WN849
0% late · 31 flights
-
WN2513
4% late · 28 flights
-
WN4406
36% late · 28 flights
-
WN1168
7% late · 27 flights
-
WN3015
4% late · 27 flights
-
WN3590
48% late · 27 flights
-
WN4421
12% late · 26 flights
-
WN2300
8% late · 24 flights
-
WN4836
18% late · 22 flights
-
WN644
23% late · 22 flights
-
WN4240
10% late · 21 flights
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