Best Time to Fly HOU to SLC: On-Time Stats by Hour & Airline
William P Hobby → Salt Lake City International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 79.8% of Houston (HOU) to Salt Lake City (SLC) flights arrived on time (409 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.
September has been the best month (99% on time) and Monday the weakest day of the week (78%).
0.5% of flights were cancelled, versus 1.8% nationally.
HOU to SLC 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% | 41 min | 0.5% | 409 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly HOU to SLC
On-time arrival % by scheduled departure hour (local time), 817 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 7am–8am | Limited data | 29 | |
| 8am–9am | 87.6% | 1.0% | 195 |
| 9am–10am | 91.0% | 1.8% | 113 |
| 10am–11am | Limited data | 6 | |
| 11am–12pm | 82.4% | 0.0% | 125 |
| 12pm–1pm | 72.7% | 0.0% | 99 |
| 1pm–2pm | 77.8% | 0.0% | 45 |
| 2pm–3pm | 57.8% | 0.0% | 64 |
| 3pm–4pm | 93.0% | 0.0% | 43 |
| 4pm–5pm | Limited data | 16 | |
| 5pm–6pm | Limited data | 8 | |
| 6pm–7pm | Limited data | 29 | |
| 7pm–8pm | Limited data | 10 | |
| 8pm–9pm | Limited data | 14 | |
| 9pm–10pm | Limited data | 4 | |
| 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 SLC
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) | Limited data | 15 | ||
| Christmas & New Year (Dec 20 - Jan 3) | 80.0% | -2.1 pts | 0.0% | 30 |
| Summer peak (Jun 15 - Aug 15) | 72.4% | -9.7 pts | 0.7% | 154 |
| All other days | 82.1% | — | 0.5% | 618 |
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).