Best Time to Fly SAT to STL: On-Time Stats by Hour & Airline
San Antonio International → St Louis Lambert International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 85.7% of San Antonio (SAT) to St. Louis (STL) flights arrived on time (548 scheduled flights). That is 8.1 points above the national average of 77.6%.
Southwest Airlines was the only reporting airline with regular flights on this route.
February has been the best month (94% on time) and Sunday the weakest day of the week (80%).
0.0% of flights were cancelled, versus 1.8% nationally.
SAT to STL on-time performance by airline
Last 12 months. Airlines with fewer than 30 completed flights are marked “limited data”.
| Airline | On time | Avg delay when late | Cancelled | Flights |
|---|---|---|---|---|
| Southwest Airlines | 85.7% | 51 min | 0.0% | 548 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly SAT to STL
On-time arrival % by scheduled departure hour (local time), 1,108 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | 97.6% | 1.2% | 169 |
| 6am–7am | 98.0% | 0.0% | 49 |
| 7am–8am | 93.8% | 0.0% | 179 |
| 8am–9am | 93.8% | 0.0% | 32 |
| 9am–10am | Limited data | 24 | |
| 10am–11am | 97.2% | 0.0% | 36 |
| 11am–12pm | Limited data | 29 | |
| 12pm–1pm | 93.8% | 0.9% | 114 |
| 1pm–2pm | Limited data | 24 | |
| 2pm–3pm | 81.8% | 0.0% | 44 |
| 3pm–4pm | 88.3% | 0.0% | 120 |
| 4pm–5pm | 72.3% | 0.0% | 188 |
| 5pm–6pm | 70.4% | 1.0% | 99 |
| 6pm–7pm | Limited data | 1 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on SAT to STL
On-time arrivals during holiday periods compared with all other days, last 24 months.
| Period | On time | vs other days | Cancelled | Flights |
|---|---|---|---|---|
| Thanksgiving week (Tue before to Mon after) | Limited data | 22 | ||
| Christmas & New Year (Dec 20 - Jan 3) | 78.3% | -10.1 pts | 0.0% | 46 |
| Summer peak (Jun 15 - Aug 15) | 86.1% | -2.3 pts | 0.0% | 208 |
| All other days | 88.4% | — | 0.5% | 832 |
Monthly on-time trend
On-time arrival % each month, with the 12-month US average for reference.
What causes delays on this route
Share of reported delay minutes, last 12 months (BTS cause categories).