Best Time to Fly SAN to IAH: On-Time Stats by Hour & Airline
San Diego International → George Bush Intercontinental/Houston
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 84.4% of San Diego (SAN) to Houston (IAH) flights arrived on time (1,696 scheduled flights). That is 6.8 points above the national average of 77.6%.
United Airlines was the only reporting airline with regular flights on this route.
Over 24 months, Tuesday was the most reliable day (88% on time) and July the worst month (76%).
The cancellation rate was 0.3% (US average 1.8%).
SAN to IAH 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 | 84.4% | 72 min | 0.3% | 1,696 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly SAN to IAH
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 | 91.2% | 1.1% | 359 |
| 7am–8am | 88.3% | 0.0% | 94 |
| 8am–9am | 88.1% | 0.8% | 375 |
| 10am–11am | 87.7% | 0.3% | 693 |
| 11am–12pm | 73.1% | 0.5% | 211 |
| 12pm–1pm | 82.8% | 0.8% | 520 |
| 1pm–2pm | 79.5% | 0.3% | 329 |
| 3pm–4pm | 77.8% | 1.3% | 467 |
| 4pm–5pm | 93.0% | 0.0% | 71 |
| 5pm–6pm | 83.5% | 0.8% | 250 |
| 6pm–7pm | 67.3% | 0.0% | 55 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on SAN to IAH
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) | 92.4% | +6.1 pts | 0.0% | 66 |
| Christmas & New Year (Dec 20 - Jan 3) | 66.2% | -20.2 pts | 1.4% | 139 |
| Summer peak (Jun 15 - Aug 15) | 75.6% | -10.7 pts | 1.2% | 594 |
| All other days | 86.4% | — | 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).