Historical on-time performance
Houston to Greenville
838 miData through May 2026Source: US DOT · BTS
No flights recorded for last 12 months on this route.
By airline
How each carrier compares
No airline figures for this window yet.
Why flights run late
Delay causes
Delay-cause data appears once delayed flights are recorded for this window.
When flights don't go
Why flights were cancelled
- Airline38%
- Weather43%
- Air traffic (NAS)19%
- Security0%
Most cancellations here are attributed to Weather. Shares are among 21 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 → GSP
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 68% to 74% on time.
- Overnights74% on time · p90 60 min · 127 flights · limited
- Evenings68% on time · p90 65 min · 586 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 65% to 73% on time.
- Wednesdays73% on time · p90 50 min · 105 flights · limited
- Tuesdays71% on time · p90 70 min · 109 flights · limited
- Sundays70% on time · p90 65 min · 110 flights · limited
- Thursdays69% on time · p90 60 min · 108 flights · limited
- Saturdays68% on time · p90 65 min · 101 flights · limited
- Mondays66% on time · p90 70 min · 109 flights · limited
- Fridays65% on time · p90 85 min · 107 flights · limited
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