Historical on-time performance
Houston to Salt Lake City
1,195 miData through Dec 2025Source: US DOT · BTS
Flights on IAH–SLC arrive on time 81% of the time over the last 12 months.
On-time rate81%arrived within 15 min
p90 delay35 min1 in 10 flights is worse (tail risk)
Cancelled0.6%of scheduled flights
based on 1,912 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.
- Delta Air LinesOn-time81%Medianon timep9045 minCancel0.4%Flights999
- United AirlinesOn-time81%Medianon timep9030 minCancel0.8%Flights913
Why flights run late
Delay causes
- Airline47%
- Weather4%
- Air traffic (NAS)11%
- Late aircraft37%
- Security0%
Most delay minutes here are attributed to Airline.
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 (2023-01 .. 2025-12).
Best time of day
On-time rates are fairly even by time of day on this route — ranging from 67% to 85% on time.
- Mornings85% on time · p90 20 min · 2,009 flights
- Middays82% on time · p90 40 min · 1,561 flights
- Afternoons81% on time · p90 45 min · 324 flights
- Evenings77% on time · p90 50 min · 1,401 flights
- Overnights67% on time · p90 75 min · 686 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 77% to 81% on time.
- Thursdays81% on time · p90 40 min · 869 flights
- Saturdays81% on time · p90 35 min · 771 flights
- Tuesdays81% on time · p90 40 min · 868 flights
- Wednesdays80% on time · p90 45 min · 866 flights
- Fridays80% on time · p90 45 min · 871 flights
- Mondays79% on time · p90 40 min · 877 flights
- Sundays77% on time · p90 50 min · 859 flights
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