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Route Reliability

Greenville → Houston

GSP–IAH · 837 miles · Greenville–Spartanburg International Airport to George Bush Intercontinental Airport

87
Pretty Reliable
WanderNerd Reliability Score
85%
Arrive within 15 minutes
1 min early
Average arrival delay
1.5%
Cancelled
666
Flights in the data

Data through May 2026.

United Airlines is the only airline in this data on this route, arriving on time 85% of the time across 666 flights. No comparison to make.

What the data says

Morning-you made the right choice.

GSP–IAH flights departing between 6–9 AM arrived on time 91% of the time, versus 77% between 3–6 PM.

Skip Saturday if you can.

GSP–IAH flights arrived on time 89% of the time on Wednesdays. On Saturdays: 77%.

Slipping a little lately.

GSP–IAH flights arrived on time 86% of the time over the last three months in the data, compared with 93% in the three months before that.

Best historical flights

Ranked by on-time arrivals, minimum 100 flights. Past performance, not a promise.

Top flights by on-time rate

More flights on this route

The breakdown

On-time by weekday
  • Mon85%(102 flights)
  • Tue86%(86 flights)
  • Wed89%(100 flights)
  • Thu85%(103 flights)
  • Fri80%(102 flights)
  • Sat77%(64 flights)
  • Sun88%(99 flights)
On-time by departure window
  • 6–9 AM91%(357 flights)
  • 3–6 PM77%(299 flights)
On-time trend by month
78%
May

Jun 68% → May 78% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202568%57
July 202574%57
August 202578%54
September 202590%52
October 202590%58
November 202582%56
December 202591%55
January 202692%48
February 202696%44
March 202689%55
April 202692%60
May 202678%60

Same trip, other airports

Keep nerding

Based on 666 historical flights, because apparently we checked. Historical flight data: U.S. Bureau of Transportation Statistics, June 2025 – May 2026. Data through May 2026. How we calculate this.