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Route · PHL → GSP · 2020–2025 BTS data

Philadelphia to Greer

According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), PHL to GSP (Philadelphia to Greer) ranks #3611 of 4927 tracked domestic routes by total flights (most flights = #1).

Data updated 2026-06-13

77.7%
On-time
-1.3 pts
vs US avg
88 min
Delay when late
2,337
Flights
#3611 of 4927
Corpus placement

Cancelled

1.9%

Best Month

Sep 2025 89%

Worst Month

Aug 2024 57%

Distance

515 mi

Carriers

3

Monthly Performance

Recent 24 months of route data.

Period Flights Delayed Cancelled Diverted Carriers
Dec 2025 31 9 2 0 OH
Nov 2025 30 9 1 0 OH
Oct 2025 36 6 0 0 OH
Sep 2025 76 8 0 0 OH
Aug 2025 31 8 0 0 OH
Jul 2025 31 16 2 0 OH
Jun 2025 34 19 3 0 OH
May 2025 57 24 2 0 OH
Apr 2025 30 11 0 0 OH
Mar 2025 45 13 0 0 OH
Feb 2025 44 15 1 0 OH
Jan 2025 31 6 2 0 OH
Dec 2024 30 9 1 0 OH
Nov 2024 32 4 0 0 OH
Oct 2024 41 11 0 0 OH
Sep 2024 33 14 0 0 YX,OH
Aug 2024 61 26 4 1 YX,OH
Jul 2024 61 18 1 0 OH,YX
Jun 2024 60 7 1 0 OH,YX
May 2024 81 13 0 0 OH
Apr 2024 33 9 0 0 OH,YX
Mar 2024 62 7 0 0 OH,YX
Feb 2024 44 6 0 0 OH,YX
Jan 2024 37 8 0 0 YX,OH

PHL–GSP seasonal on-time pattern

Best: March (85.5%) · weakest: July (64.2%)

60%65%70%75%80%85%90% JanFebMarAprMayJunJulAugSepOctNovDec 82.8%

Strongest calendar month

March

85.5% on-time · ~47 flights/mo

Busiest calendar month

May

~57 flights/mo avg

Weakest calendar month

July

64.2% on-time · ~40 flights/mo

Cancellation Rate

1.9%

20 of 1,051 flights

Diversion Rate

0.1%

1 of 1,051 flights

Explore origin & destination

On-time and delay data for the airports this route connects.

PHL - Philadelphia

Full on-time, delay-cause, and seasonal performance for Philadelphia, PA.

PHL on-time profile

GSP - Greer

Full on-time, delay-cause, and seasonal performance for Greer, SC.

GSP on-time profile

Compare the two airports

See PHL and GSP side by side on delays, cancellations, and reliability.

Compare PHL vs GSP

Origin-hub reliability standing

Mid-pack among PHL departures

From PHL, this corridor sits with 60 other 75–85% on-time routes out of 65 tracked departures, not the hub's reliability leaders (4 at ≥85%) and not the softest ( 1 below 75%). Destination: Greer · fleet on-time rank #3929 of 4927.

What the Data Says About PHL to GSP

The Philadelphia to Greer corridor (PHL to GSP) posts a 77.7% on-time rate on the lower edge of the average band, based on 2,337 tracked flights. Late flights run 88.4 minutes behind on average. 3 carriers cover the 515-mile route; over the last 24 months, 20 of 1,051 flights were cancelled (1.9%) and 0.1% diverted.

The monthly split is wide on this route: Sep 2025 posted the strongest performance at 89% on-time, while Aug 2024 came in at just 57% - a 32-point swing worth factoring into travel timing.

On the multi-year calendar, PHL–GSP peaks in March at 85.5% on-time while May carries the heaviest traffic (~57 flights per month) ; the softest month is July at 64.2%, a 21.3-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.

Frequently Asked Questions

Where does PHL to GSP rank among US routes by traffic? ▼
According to PlainFlights' route traffic ranking, PHL to GSP ranks #3611 of 4927 tracked domestic routes by total flights (most flights = #1). That ordinal matches our busiest-routes listing (total_flights DESC). See /methodology#corpus-placement for the exact sort basis.
How often are flights delayed from PHL to GSP? ▼
Flights from Philadelphia to Greer have a 77.7% on-time rate based on 2,337 flights. The average delay is 88.4 minutes. The best recent month was Sep 2025 with 89% on-time.
What is the cancellation rate for PHL to GSP? ▼
Over the last 24 months, 1.9% of flights on this route were cancelled (20 of 1,051 flights) and 0.1% were diverted.
How far is the flight from PHL to GSP? ▼
The flight distance from Philadelphia (PHL) to Greer (GSP) is approximately 515 miles. This route is served by 3 carriers.
When is the best time to fly from PHL to GSP? ▼
The best recent month for on-time performance was Sep 2025 (89% on-time). The worst was Aug 2024 (57% on-time). Consider booking during months with historically better performance.

Airports on this route

PHL Airport

Philadelphia
GSP Airport

Greer
Data source

Data Source: Bureau of Transportation Statistics (BTS), On-Time Performance Data. Statistics reflect cumulative performance across all available reporting periods.

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

Using PHL–GSP data

PHL–GSP is mid-pack at 77.7% on-time; month and carrier mix move more than the corridor headline.

  • Compare PHL and GSP airport profiles: delay causes and top routes differ even on the same corridor. PHL airport
  • If your dates flex, March (85.5% on-time) beats July (64.2%) on this corridor. Seasonal chart
  • 4 other routes post a similar 77.7% on-time rate; compare before you commit to this pairing. Similar routes

On-time rate reflects the BTS historical average across all reporting carriers on this origin–destination pair, not any single flight or booking recommendation.

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

Every figure on PlainFlights is rendered directly from BTS On-Time Performance data, no number is typed in by an editor. This page aggregates this specific route's on-time performance and monthly trend, live from the dataset. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.