Historical on-time performance
Houston to Greenville
838 miData through Dec 2025Source: US DOT · BTS
Flights on IAH–GSP arrive on time 72% of the time over the last 12 months.
On-time rate72%arrived within 15 min
p90 delay35 min1 in 10 flights is worse (tail risk)
Cancelled1.1%of scheduled flights
based on 92 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- United AirlinesOn-time72%Medianon timep9035 minCancel1.1%Flights92
Why flights run late
Delay causes
- Airline81%
- Weather3%
- Air traffic (NAS)2%
- Late aircraft14%
- 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 → GSP
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 73% on time.
- Overnights73% on time · p90 70 min · 139 flights · limited
- Evenings67% on time · p90 70 min · 660 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 66% to 73% on time.
- Wednesdays73% on time · p90 60 min · 118 flights · limited
- Thursdays69% on time · p90 65 min · 120 flights · limited
- Saturdays69% on time · p90 60 min · 113 flights · limited
- Sundays68% on time · p90 65 min · 123 flights · limited
- Tuesdays68% on time · p90 70 min · 123 flights · limited
- Mondays66% on time · p90 75 min · 122 flights · limited
- Fridays66% on time · p90 85 min · 119 flights · limited
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