Airport · GSP · Greer, South Carolina

Greer, SC

Greer, SC posts above-median on-time performance among the 382 tracked U.S. airports, as a high-volume U.S. airport. According to the U.S. DOT Bureau of Transportation Statistics, drawn from 155,526 flights (2020–2025); its biggest delay driver is late aircraft.

Compiled by PlainFlights Editorial, Flight Performance Editorial Team

Data updated 2026-06-13

83.5%
On-time: Top 48%
on-time, US airports: 77 min
Delay when late: 1.12%
Cancelled

Key Performance Metrics

Total Flights

155,526

Best Month

Sep 94.8%

Worst Month

Jul 89.4%

Delayed

25,645

Cancelled

1,749

60-65%

1
65-70%

4
70-75%

9
75-80%

48
80-85%

192
85-90%

116
90-95%

12

What this shows GSP is marked in the 80-85% band.

Delay Cause Breakdown

Top delay cause: Late Aircraft. Total delay minutes: 885,123.

Late Aircraft 40.8% (361,376 min)

Carrier 34.1% (302,158 min)

NAS (National Aviation System) 19.6% (173,515 min)

Weather 5.3% (47,084 min)

Security 0.1% (990 min)

Seasonal Performance Patterns

Monthly averages across all years of data. Best month: September (94.8% on-time). Most delays: July (89.4% on-time).

Month	Avg Flights	Avg Delayed	Avg Cancelled	On-Time %
December	2,157	380	12	92.1%
November	2,168	279	10	94.3%
October	2,282	298	4	94.3%
September	2,097	258	11	94.8%
August	2,253	395	21	92.7%
July	2,240	553	30	89.4%
June	2,086	446	30	90.8%
May	2,163	396	16	92.1%
April	2,085	292	58	94.1%
March	2,273	327	41	94%
February	1,987	300	20	93.7%
January	2,132	352	38	93%

Year-Over-Year Performance

Annual flight volume and on-time trends at GSP.

Year	Flights	Delayed	Cancelled	On-Time %
2025	28,364	2,709	299	90.4%
2024	32,646	2,503	232	92.3%
2023	26,913	1,730	160	93.6%
2022	25,300	1,806	339	92.9%
2021	23,188	1,418	143	93.9%
2020	19,115	813	576	95.7%

Cancellation & Diversion Analysis

Flight disruption statistics for Greer, SC.

Cancellation Rate

1.12%

1,749 of 155,526 flights

Diversion Rate

0.11%

164 of 155,526 flights

Delay Rate

16.5%

25,645 of 155,526 flights

Monthly Performance

Recent 24 months of flight data.

Period	Flights	Dep Delayed	Arr Delayed	Cancelled	Diverted
Dec 2025	2,307	280	339	24	6
Nov 2025	2,289	189	223	45	2
Oct 2025	2,396	204	254	3	1
Sep 2025	2,296	120	151	6	2
Aug 2025	2,429	207	272	19	6
Jul 2025	2,632	360	442	44	5
Jun 2025	2,454	342	466	39	7
May 2025	2,533	276	340	19	2
Apr 2025	2,289	183	248	9	1
Mar 2025	2,427	208	284	21	5
Feb 2025	2,116	181	269	22	4
Jan 2025	2,196	159	222	48	0
Dec 2024	2,683	258	293	10	5
Nov 2024	2,689	128	169	3	3
Oct 2024	2,930	153	207	3	0
Sep 2024	2,717	187	224	23	1
Aug 2024	2,963	248	353	33	6
Jul 2024	3,003	362	487	58	5
Jun 2024	2,826	219	287	23	5
May 2024	2,898	323	413	20	3
Apr 2024	2,652	168	248	7	1
Mar 2024	2,540	145	220	4	2
Feb 2024	2,329	100	135	11	1
Jan 2024	2,416	212	269	37	3

Top Routes from GSP

Busiest routes to and from Greer, SC.

Route	Flights	On-Time	Distance
GSP (Greer) → ATL (Atlanta)	18,285	91.8%	153 mi
ATL (Atlanta) → GSP (Greer)	18,284	86.7%	153 mi
GSP (Greer) → CLT (Charlotte)	14,768	82.2%	75 mi
CLT (Charlotte) → GSP (Greer)	14,762	80.6%	75 mi
GSP (Greer) → ORD (Chicago)	6,603	81.7%	577 mi
ORD (Chicago) → GSP (Greer)	6,594	79.6%	577 mi
DFW (Dallas/Fort Worth) → GSP (Greer)	5,828	74.8%	862 mi
GSP (Greer) → DFW (Dallas/Fort Worth)	5,828	79.3%	862 mi
LGA (New York) → GSP (Greer)	5,399	82.3%	610 mi
GSP (Greer) → LGA (New York)	5,397	85.6%	610 mi
DCA (Washington) → GSP (Greer)	4,568	76%	396 mi
GSP (Greer) → DCA (Washington)	4,567	78.8%	396 mi
EWR (Newark) → GSP (Greer)	3,314	82.9%	594 mi
GSP (Greer) → EWR (Newark)	3,273	84.8%	594 mi
DTW (Detroit) → GSP (Greer)	2,873	84.3%	508 mi
GSP (Greer) → DTW (Detroit)	2,871	89.8%	508 mi
PHL (Philadelphia) → GSP (Greer)	2,337	77.7%	515 mi
BWI (Baltimore) → GSP (Greer)	2,270	78.4%	426 mi
GSP (Greer) → BWI (Baltimore)	2,270	85%	426 mi
GSP (Greer) → PHL (Philadelphia)	2,248	85.5%	515 mi

Airports With a Similar On-Time Rate

Other U.S. airports nationwide whose on-time rate is closest to Greer, SC's 83.5%.

Hilton Head, SC

83.5% on-time 27,234 flights

Casper, WY

83.5% on-time 20,592 flights

Latrobe, PA

83.5% on-time 8,539 flights

Lexington, KY

83.6% on-time 91,507 flights

Burlington, VT

83.4% on-time 79,685 flights

Chattanooga, TN

83.6% on-time 66,136 flights

Other Airports in South Carolina

Compare performance with other South Carolina airports.

CHS 81.4%

Charleston, SC

Charleston · 276,798 flights

MYR 82.1%

Myrtle Beach, SC

Myrtle Beach · 171,781 flights

CAE 84.3%

Columbia, SC

Columbia · 67,973 flights

HHH 83.5%

Hilton Head, SC

Hilton Head · 27,234 flights

FLO 92.5%

Florence, SC

Florence · 226 flights

Keep exploring

More flight data around Greer, SC.

South Carolina flight data

Statewide on-time and delay aggregates, plus every reporting airport in South Carolina.

View SC data →

Airport rankings

See where GSP sits among U.S. airports on on-time rate and average delay.

Best on-time airports →

Compare airports

Put GSP head-to-head with another airport on delays and reliability.

Open comparison tool →

What the Data Says About GSP

Greer, SC in Greer, South Carolina handled 155,526 flights in the Bureau of Transportation Statistics dataset between 2020 and 2025, posting a 83.5% on-time departure rate. Of those flights, 25,645 experienced delays, 1,749 were cancelled, and 164 were diverted. The cancellation rate works out to 1.12%, the diversion rate to 0.11%, and the average delay when departures run late is 77.4 minutes. These figures are the baseline for comparing GSP against other airports in the same state and nationally.

Breaking down what drives delays at GSP, Late Aircraft leads the pack. Late Aircraft accounts for 40.8% of total delay minutes, followed by Carrier at 34.1% and NAS (National Aviation System) at 19.6%. Weather contributes 5.3% of delay minutes at this airport, while security holds the smallest share at 0.1%. Travelers often overestimate the weather share; the BTS categorization shows late-arriving aircraft and carrier operations as the larger contributors.

Seasonally, September runs the cleanest at GSP with a 94.8% on-time rate, while July is the roughest at 89.4% - a 5-point swing between best and worst month. Volume peaks in October, when average flights hit 2,282. The busiest route connecting GSP is to ATL (Atlanta), with 18,285 flights at a 91.8% on-time rate. Combine these numbers - 83.5% on-time, 77.4-minute average delay, 1.12% cancellation rate, and you have a concrete picture of departure reliability at Greer, SC.

Frequently Asked Questions

What is the on-time performance rate at Greer, SC (GSP)? ▼

Greer, SC has an overall on-time departure rate of 83.5%. Out of 155,526 total flights tracked, 25,645 experienced delays and 1,749 were cancelled.

What is the most common cause of delays at GSP? ▼

The top delay cause at Greer, SC is Late Aircraft. Late Aircraft accounts for 40.8% of all delay minutes.

What is the average delay time at GSP? ▼

The average delay at Greer, SC is 77.4 minutes. This includes delays from carrier issues, weather, National Aviation System constraints, security, and late-arriving aircraft.

What is the best month to fly from GSP? ▼

Based on historical data, September has the best on-time performance at GSP with 94.8% of flights departing on time.

What is the worst month for delays at GSP? ▼

July tends to have the most delays at GSP, with an on-time rate of only 89.4%.

How many routes operate from GSP? ▼

Greer, SC serves at least 20 routes. The busiest route is GSP to ATL (Greer - Atlanta) with 18,285 flights.

What is the cancellation rate at GSP? ▼

Greer, SC has a cancellation rate of 1.12%, based on 1,749 cancelled flights out of 155,526 total flights tracked.

Flight Guides

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Why Flights Get Cancelled

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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.

Read our methodology - how this data is sourced, computed, and verified.

Using GSP's data

An airport-level on-time rate is a starting point, not a guarantee for your specific flight.

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
Scores vary by airline and route within the same airport; check the specific carrier you're flying. Browse airlines

On-time rate reflects the BTS historical average across all reporting carriers at this airport, not any single flight or airline.

All airports → | Rankings →

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 Editorial

Source: U.S. Bureau of Transportation Statistics (BTS) Airline on-time performance and operational reliability · 2025 Accessed 2026-07-23

Every figure on PlainFlights is rendered directly from BTS On-Time Performance data, no number is typed in by an editor. Airport figures are computed directly from BTS On-Time Performance data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.