Best Time to Fly IAH to SAN: On-Time Stats by Hour & Airline
George Bush Intercontinental/Houston → San Diego International
Data through July 2026 · Last updated October 18, 2026
1,696 flights were scheduled from Houston (IAH) to San Diego (SAN) in the last 12 months, and 81.5% of those that flew arrived on time, 3.8 points above the US average of 77.6%.
United Airlines was the only reporting airline with regular flights on this route.
February has been the best month (87% on time) and Thursday the weakest day of the week (75%).
0.2% of flights were cancelled, versus 1.8% nationally.
IAH 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 |
|---|---|---|---|---|
| United Airlines | 81.5% | 56 min | 0.2% | 1,696 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly IAH to SAN
On-time arrival % by scheduled departure hour (local time), 3,424 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 6am–7am | 80.0% | 0.0% | 30 |
| 7am–8am | 87.0% | 0.0% | 46 |
| 8am–9am | Limited data | 5 | |
| 9am–10am | 86.6% | 0.7% | 697 |
| 12pm–1pm | 82.7% | 0.6% | 540 |
| 2pm–3pm | 83.8% | 0.3% | 285 |
| 4pm–5pm | 83.8% | 0.2% | 514 |
| 5pm–6pm | 78.6% | 0.0% | 42 |
| 6pm–7pm | 75.4% | 0.2% | 536 |
| 7pm–8pm | 64.3% | 1.9% | 322 |
| 8pm–9pm | 79.3% | 1.0% | 407 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on IAH 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) | 84.8% | +1.7 pts | 0.0% | 66 |
| Christmas & New Year (Dec 20 - Jan 3) | 73.1% | -10.0 pts | 1.4% | 139 |
| Summer peak (Jun 15 - Aug 15) | 69.8% | -13.3 pts | 0.8% | 594 |
| All other days | 83.2% | — | 0.5% | 2,625 |
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).