According to PlainFlights' airport traffic ranking (BTS On-Time Performance total flights), Greer, SC (GSP) ranks #86 of 382 tracked US airports by total flights (most flights = #1). Greer, SC posts above-median on-time performance among the 382 tracked U.S. airports, as a high-volume U.S. airport.
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GSP on-time rate vs. the national average
Ahead of the U.S. average across all 382 tracked airports.
Delay Cause Breakdown
Top delay cause: Late Aircraft.
Total delay minutes: 885,123.
Late Aircraft40.8% (361,376 min)
Carrier34.1% (302,158 min)
NAS (National Aviation System)19.6% (173,515 min)
Weather5.3% (47,084 min)
Security0.1% (990 min)
GSP - seasonal on-time pattern
Best: September (94.8%) · worst: July (89.4%)
GSP - on-time rate by year
2020–2025, year-over-year trend.
GSP - taxi-out and taxi-in (monthly)
Average taxi-out 16.3 min · taxi-in 5.2 min over the last 24 reported months (U.S. airport mean taxi-out ≈ 16.4 min).
GSP's average taxi-out (16.3 min) sits near the recent U.S. airport mean (~16.4 min). Month-to-month, it swings from 15.0 min (June 2024) to 17.8 min (November 2024).
Two PlainFlights-derived comparison paths for Greer, SC, both outside South Carolina so the neighborhoods are not same-state geography. Axes stay disjoint: volume peers exclude the on-time peer set. Same-state compare stays below.
The standout signal at Greer, SC is the delay mix: Late Aircraft owns 40.8% of 885,123 delay minutes across 155,526 BTS flights. The on-time headline is 83.5% (4.5 pts above the 79% national average), with 25,645 delayed and 1,749 cancelled (1.12%).
Delay minutes concentrate in Late Aircraft (40.8% late-aircraft, 34.1% carrier, 19.6% NAS, 5.3% weather, 0.1% security). As a busy airport, that mix matters more for connection planning than for a thin schedule.
On the multi-year calendar, GSP is strongest in September (94.8% on-time) and weakest in July (89.4%), a 5.4-point swing. Volume peaks in October (~2,282 flights/month). The busiest connecting route is to ATL (Atlanta) at 91.8% on-time. Field definitions: on-time performance explained.
Greer, SC vs. the national on-time distribution
On-time rate among all 382 tracked U.S. airports
83.5%Top 48%higher than 52% of 382 airports
Greer, SC
60%95%
U.S. airports by on-time rate, bucketed by value
Each bar is a band; taller bars hold more airports. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.
Data Source: Bureau of Transportation Statistics (BTS), On-Time Performance Data (2020–2025).
Statistics reflect cumulative performance across all available reporting periods. On-time rates exclude cancelled and diverted flights.
GSP's on-time book is mid-pack; month and delay-cause mix move more than the headline rate.
Check the busiest route from GSP before you book a connection. See top routes →
Travel in September rather than July if your dates are flexible. Seasonal patterns →
Gate-to-wheels taxi-out averages 16.3 min here; check the monthly series before a tight connection. Taxi times →
On-time rate reflects the BTS historical average across all reporting carriers at this airport, not any single flight or airline.
Frequently Asked Questions
What is Greer, SC's on-time rate?
Greer, SC (GSP) has a 83.5% on-time rate across 155,526 BTS-tracked flights (2020-2025), 4.5 pts above the 79% national flight-weighted average; that places it in roughly the above-median on-time performance.
How does GSP rank among U.S. airports by traffic volume?
Greer, SC ranks #86 of 382 tracked US airports by total BTS flights (most flights = #1), making it a high-volume U.S. airport.
What's the most common cause of delays at Greer, SC?
Late Aircraft is the leading delay cause at GSP, accounting for 40.8% of delay minutes. The full breakdown: 40.8% late-aircraft, 34.1% carrier, 19.6% NAS/air-traffic-control, 5.3% weather, and 0.1% security.
When is the best time to fly through Greer, SC?
September is historically GSP's strongest month at 94.8% on-time, while July is the weakest at 89.4%, a 5.4-point swing across the BTS historical record.
Data sourced from U.S. Department of Transportation Bureau of Transportation Statistics (BTS) On-Time Performance data. See our methodology for details. Retrieved and formatted by PlainFlights