Historical on-time performance
Houston to Salt Lake City
Flights on IAH–SLC arrive on time 82% of the time over the last 12 months.
based on 1,897 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
Too close to call — no single carrier is clearly more on-time here.
- United AirlinesOn-time82%Medianon timep9030 minCancel0.9%Flights886
- Delta Air LinesOn-time82%Medianon timep9040 minCancel0.3%Flights1,011
Why flights run late
Delay causes
- Airline46%
- Weather5%
- Air traffic (NAS)12%
- Late aircraft37%
- Security0%
Most delay minutes here are attributed to Airline.
When flights don't go
Why flights were cancelled
- Airline36%
- Weather55%
- Air traffic (NAS)9%
- Security0%
Most cancellations here are attributed to Weather. Shares are among 11 cancellations with a reported cause (BTS reports causes from June 2003).
Over time
On-time trend
By season
On-time rate by month
When to fly
Best time to fly IAH → SLC
All airlines · rolling 36 months (2023-06 .. 2026-05).
Best time of day
On-time rates are fairly even by time of day on this route — ranging from 69% to 85% on time.
- Mornings85% on time · p90 20 min · 2,037 flights
- Middays83% on time · p90 40 min · 1,584 flights
- Afternoons83% on time · p90 40 min · 266 flights
- Evenings78% on time · p90 50 min · 1,286 flights
- Overnights69% on time · p90 75 min · 772 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 78% to 83% on time.
- Thursdays83% on time · p90 35 min · 873 flights
- Fridays82% on time · p90 45 min · 878 flights
- Saturdays82% on time · p90 35 min · 771 flights
- Tuesdays81% on time · p90 40 min · 851 flights
- Wednesdays81% on time · p90 40 min · 855 flights
- Mondays80% on time · p90 40 min · 864 flights
- Sundays78% on time · p90 45 min · 853 flights
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