Best Time to Fly HOU to SAN: On-Time Stats by Hour & Airline
William P Hobby → San Diego International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 76.3% of Houston (HOU) to San Diego (SAN) flights arrived on time (962 scheduled flights). That is 1.4 points below the national average of 77.6%.
Southwest Airlines was the only reporting airline with regular flights on this route.
August has been the best month (91% on time) and Thursday the weakest day of the week (72%).
0.7% of flights were cancelled, versus 1.8% nationally.
HOU to SAN 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 | 76.3% | 44 min | 0.7% | 962 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly HOU to SAN
On-time arrival % by scheduled departure hour (local time), 1,806 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | Limited data | 30 | |
| 6am–7am | 96.8% | 0.0% | 32 |
| 7am–8am | 81.8% | 0.0% | 88 |
| 8am–9am | 87.9% | 0.7% | 427 |
| 9am–10am | 93.1% | 0.0% | 145 |
| 11am–12pm | Limited data | 30 | |
| 12pm–1pm | 77.1% | 0.0% | 70 |
| 1pm–2pm | 68.9% | 0.0% | 74 |
| 2pm–3pm | 63.2% | 0.0% | 114 |
| 3pm–4pm | 58.1% | 0.0% | 74 |
| 4pm–5pm | 77.2% | 0.0% | 79 |
| 5pm–6pm | 77.5% | 2.9% | 105 |
| 6pm–7pm | 76.5% | 1.0% | 103 |
| 7pm–8pm | 64.0% | 0.7% | 150 |
| 8pm–9pm | 66.9% | 0.6% | 158 |
| 9pm–10pm | 63.0% | 0.0% | 110 |
| 10pm–11pm | Limited data | 17 | |
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 SAN
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) | 75.7% | -4.3 pts | 0.0% | 37 |
| Christmas & New Year (Dec 20 - Jan 3) | 62.5% | -17.5 pts | 1.2% | 85 |
| Summer peak (Jun 15 - Aug 15) | 68.5% | -11.5 pts | 0.0% | 336 |
| All other days | 80.0% | — | 0.7% | 1,348 |
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).