Best Time to Fly HOU to STL: On-Time Stats by Hour & Airline
William P Hobby → St Louis Lambert International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 79.8% of Houston (HOU) to St. Louis (STL) flights arrived on time (1,559 scheduled flights). That is 2.2 points above the national average of 77.6%.
Southwest Airlines was the only reporting airline with regular flights on this route.
Over 24 months, Tuesday was the most reliable day (87% on time) and June the worst month (73%).
The cancellation rate was 0.5% (US average 1.8%).
HOU 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 | 79.8% | 50 min | 0.5% | 1,559 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly HOU to STL
On-time arrival % by scheduled departure hour (local time), 3,095 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | 95.8% | 0.9% | 431 |
| 6am–7am | 97.0% | 4.7% | 106 |
| 7am–8am | 92.0% | 0.3% | 328 |
| 8am–9am | 93.7% | 1.1% | 191 |
| 9am–10am | 91.4% | 0.0% | 58 |
| 10am–11am | 87.2% | 0.6% | 166 |
| 11am–12pm | 80.4% | 2.1% | 47 |
| 12pm–1pm | 74.8% | 0.0% | 107 |
| 1pm–2pm | 79.5% | 0.6% | 173 |
| 2pm–3pm | 79.5% | 1.4% | 148 |
| 3pm–4pm | 94.1% | 1.9% | 103 |
| 4pm–5pm | 72.0% | 0.5% | 184 |
| 5pm–6pm | 69.0% | 0.0% | 191 |
| 6pm–7pm | 80.4% | 0.0% | 199 |
| 7pm–8pm | 69.0% | 0.9% | 215 |
| 8pm–9pm | 76.2% | 1.7% | 235 |
| 9pm–10pm | 70.7% | 0.0% | 116 |
| 10pm–11pm | 71.1% | 0.0% | 97 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on HOU 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) | 89.2% | +5.2 pts | 0.0% | 65 |
| Christmas & New Year (Dec 20 - Jan 3) | 81.8% | -2.3 pts | 0.7% | 138 |
| Summer peak (Jun 15 - Aug 15) | 77.7% | -6.3 pts | 0.7% | 581 |
| All other days | 84.1% | — | 0.9% | 2,311 |
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).