Houston (IAH) to Salt Lake City (SLC): On-Time Performance
Data through July 2026
Houston (IAH) to Salt Lake City (SLC) effectively runs on two schedules. In September 2025, 91% of arrivals were on time; in July 2024 that fell to 60% — a 30-point seasonal swing. Across the full period the route averages 82% on-time against a national 78%. Morning departures also hold up better than evening ones (85% vs 77%), which matters most in the rough months.
- On-time
- 82%
- arrived <15 min late
- Avg delay
- 15 min
- completed flights
- Cancelled
- 0.8%
- Flights/day
- 5.3
- last 12 months
- Duration
- 3h 20m
- scheduled
- Distance
- 1,195 mi
Best airline from IAH to SLC
3 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| Delta Air Linesmost reliable | 82% | 17 min | 0.6% | 2,130 |
| United Airlines | 82% | 12 min | 1.0% | 1,789 |
| SkyWest Airlines | 78% | 22 min | 0.6% | 180 |
Monthly on-time trend
Best time to fly from IAH to SLC
Aim for departures around 2 p.m. (87% on-time); avoid 8 p.m. departures (74%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 82% | 14 min |
| Tuesday | 83% | 15 min |
| Wednesday | 81% | 14 min |
| Thursdaybest | 84% | 11 min |
| Friday | 82% | 16 min |
| Saturday | 83% | 16 min |
| Sunday | 78% | 19 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft38%
- Airline operations46%
- National airspace system12%
- Weather5%
Frequently asked questions
- How often are flights from IAH to SLC delayed?
- 18% of IAH–SLC flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-07 and 2026-07. The average arrival delay across completed flights was 15 minutes.
- Which airline is most reliable from IAH to SLC?
- Delta Air Lines has the best on-time record on this route at 82%, based on 2,130 flights. 3 airlines flew IAH–SLC frequently enough to compare in this period.
- What is the best time of day to fly from IAH to SLC?
- Departures around 2 p.m. have the best record (87% on-time), while departures around 8 p.m. have the worst (74%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from IAH to SLC?
- The scheduled IAH–SLC flight time averages 3h 20m over 1,195 miles. Actual arrival times vary — flights on this route land 15+ minutes late 18% of the time.
- How often are IAH to SLC flights cancelled?
- 0.8% of scheduled flights on this route were cancelled between 2024-07 and 2026-07, at or below the national rate of 1.6%.
- What is the worst month to fly from IAH to SLC?
- July 2024 was the roughest month in this dataset, with only 60% of arrivals on time. The best was September 2025 at 91%. If your dates are flexible, that 30-point gap is worth planning around.
Explore related pages
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Related guides
Based on 4,099 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.