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Airport Reliability

GSP · Greenville

Greenville–Spartanburg International Airport

82%
Departures within 15 minutes
12 min
Average departure delay
77%
Arrivals within 15 minutes
2.8%
Departures cancelled

Based on 19,735 departures and 19,736 arrivals. Data through May 2026.

What the data says

Morning flights do better here.

Departures from GSP departing between 3–6 AM arrived on time 94% of the time, versus 52% between 9 PM–12 AM.

Wednesday comes out ahead.

A small edge: 85% on time on Wednesdays against 79% on Sundays.

When GSP gets messy

On-time by departure window
  • 3–6 AM94%(694 flights)
  • 6–9 AM89%(5548 flights)
  • 9 AM–12 PM86%(3879 flights)
  • 12–3 PM84%(2763 flights)
  • 3–6 PM73%(3212 flights)
  • 6–9 PM68%(2949 flights)
  • 9 PM–12 AM52%(77 flights)
On-time by weekday
  • Mon80%(2833 flights)
  • Tue83%(2657 flights)
  • Wed85%(2698 flights)
  • Thu81%(2921 flights)
  • Fri81%(2863 flights)
  • Sat84%(2301 flights)
  • Sun79%(2849 flights)
On-time trend by month
84%
May

Jun 73% → May 84% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202573%1660
July 202574%1700
August 202583%1695
September 202589%1596
October 202585%1736
November 202583%1521
December 202578%1538
January 202682%1315
February 202684%1300
March 202679%1570
April 202687%1685
May 202684%1806

Airlines departing GSP

Busiest routes from GSP

Based on 19,735 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.