Best Time to Fly STL to HOU: On-Time Stats by Hour & Airline
St Louis Lambert International → William P Hobby
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 78.5% of St. Louis (STL) to Houston (HOU) flights arrived on time (1,539 scheduled flights). That is 0.9 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 (92% on time) and Monday the weakest day of the week (75%).
0.3% of flights were cancelled, versus 1.8% nationally.
STL to HOU 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 | 78.5% | 54 min | 0.3% | 1,539 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly STL to HOU
On-time arrival % by scheduled departure hour (local time), 3,075 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | 94.9% | 1.0% | 395 |
| 6am–7am | 91.6% | 1.2% | 169 |
| 7am–8am | 91.2% | 0.4% | 253 |
| 8am–9am | 90.2% | 0.0% | 207 |
| 9am–10am | 87.6% | 0.7% | 146 |
| 10am–11am | 88.2% | 1.4% | 69 |
| 11am–12pm | 92.5% | 0.9% | 107 |
| 12pm–1pm | 79.4% | 0.5% | 200 |
| 1pm–2pm | 76.4% | 0.0% | 141 |
| 2pm–3pm | 61.8% | 0.0% | 68 |
| 3pm–4pm | 78.8% | 0.0% | 33 |
| 4pm–5pm | 73.2% | 0.0% | 57 |
| 5pm–6pm | 76.5% | 0.5% | 215 |
| 6pm–7pm | 63.2% | 0.8% | 243 |
| 7pm–8pm | 61.6% | 0.0% | 146 |
| 8pm–9pm | 79.0% | 0.9% | 230 |
| 9pm–10pm | 68.8% | 1.3% | 227 |
| 10pm–11pm | 68.9% | 1.2% | 169 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on STL to HOU
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) | 72.3% | -9.9 pts | 0.0% | 65 |
| Christmas & New Year (Dec 20 - Jan 3) | 79.7% | -2.5 pts | 0.0% | 140 |
| Summer peak (Jun 15 - Aug 15) | 74.3% | -7.9 pts | 0.7% | 567 |
| All other days | 82.2% | — | 0.7% | 2,303 |
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).