Best Time to Fly IAH to SLC: On-Time Stats by Hour & Airline
George Bush Intercontinental/Houston → Salt Lake City International
Data through July 2026 · Last updated October 18, 2026
1,949 flights were scheduled from Houston (IAH) to Salt Lake City (SLC) in the last 12 months, and 83.0% of those that flew arrived on time, 5.4 points above the US average of 77.6%.
United Airlines was the most punctual of the 3 airlines on the route at 83.5%, while SkyWest Airlines trailed at 77.4%.
September has been the best month (88% on time) and Sunday the weakest day of the week (80%).
0.5% of flights were cancelled, versus 1.8% nationally.
IAH 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 |
|---|---|---|---|---|
| United Airlines | 83.5% | 57 min | 0.6% | 874 |
| Delta Air Lines | 83.0% | 90 min | 0.3% | 1,012 |
| SkyWest Airlines | 77.4% | 63 min | 1.6% | 63 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly IAH to SLC
On-time arrival % by scheduled departure hour (local time), 3,947 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 7am–8am | 86.2% | 0.4% | 730 |
| 8am–9am | Limited data | 24 | |
| 9am–10am | 86.0% | 0.9% | 683 |
| 11am–12pm | 86.2% | 0.4% | 473 |
| 12pm–1pm | 85.4% | 0.2% | 413 |
| 1pm–2pm | Limited data | 24 | |
| 2pm–3pm | 87.1% | 0.0% | 85 |
| 3pm–4pm | Limited data | 6 | |
| 4pm–5pm | 75.7% | 0.7% | 137 |
| 5pm–6pm | 85.1% | 0.0% | 74 |
| 6pm–7pm | 85.9% | 0.0% | 171 |
| 7pm–8pm | 76.2% | 0.3% | 575 |
| 8pm–9pm | 75.1% | 0.9% | 552 |
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 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) | 75.0% | -8.9 pts | 0.0% | 64 |
| Christmas & New Year (Dec 20 - Jan 3) | 81.4% | -2.5 pts | 0.5% | 211 |
| Summer peak (Jun 15 - Aug 15) | 78.5% | -5.5 pts | 0.5% | 599 |
| All other days | 83.9% | — | 0.5% | 3,073 |
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).