Route · GSP → PHL · 2020–2025 BTS data
Greer to Philadelphia
According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), GSP to PHL (Greer to Philadelphia) ranks #3667 of 4927 tracked domestic routes by total flights (most flights = #1).
Data updated 2026-06-13
- 85.5%
- On-time
- +6.5 pts
- vs US avg
- 97 min
- Delay when late
- 2,248
- Flights
- #3667 of 4927
- Corpus placement
Cancelled
2.2%
Best Month
Sep 2025 97%
Worst Month
Jul 2024 69%
Distance
515 mi
Carriers
4
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Dec 2025 | 31 | 6 | 1 | 0 | OH |
| Nov 2025 | 30 | 3 | 1 | 0 | OH |
| Oct 2025 | 36 | 2 | 0 | 0 | OH |
| Sep 2025 | 76 | 2 | 0 | 0 | OH |
| Aug 2025 | 31 | 5 | 0 | 0 | AA,OH |
| Jul 2025 | 31 | 7 | 0 | 0 | OH |
| Jun 2025 | 34 | 6 | 0 | 0 | OH |
| May 2025 | 57 | 14 | 3 | 0 | OH |
| Apr 2025 | 31 | 2 | 0 | 0 | OH |
| Mar 2025 | 45 | 8 | 1 | 0 | OH |
| Feb 2025 | 44 | 10 | 3 | 0 | OH |
| Jan 2025 | 31 | 3 | 2 | 0 | OH |
| Nov 2024 | 33 | 3 | 0 | 0 | YX,OH |
| Oct 2024 | 41 | 0 | 0 | 0 | OH |
| Sep 2024 | 33 | 3 | 0 | 0 | YX,OH |
| Aug 2024 | 61 | 9 | 7 | 0 | YX,OH |
| Jul 2024 | 61 | 19 | 2 | 0 | OH,YX |
| Jun 2024 | 60 | 8 | 1 | 0 | OH,YX |
| May 2024 | 81 | 15 | 0 | 0 | OH |
| Apr 2024 | 33 | 3 | 0 | 0 | OH,YX |
| Mar 2024 | 62 | 6 | 0 | 0 | OH,YX |
| Feb 2024 | 44 | 4 | 1 | 0 | OH,YX |
| Jan 2024 | 37 | 7 | 1 | 0 | YX,OH |
| Dec 2023 | 38 | 4 | 0 | 0 | OH,YX |
GSP–PHL seasonal on-time pattern
Best: October (95.8%) · weakest: July (74.6%)
Strongest calendar month
October
95.8% on-time · ~43 flights/mo
Busiest calendar month
May
~57 flights/mo avg
Weakest calendar month
July
74.6% on-time · ~42 flights/mo
Cancellation Rate
2.2%
23 of 1,061 flights
Diversion Rate
0.0%
0 of 1,061 flights
Explore origin & destination
On-time and delay data for the airports this route connects.
GSP - Greer
Full on-time, delay-cause, and seasonal performance for Greer, SC.
GSP on-time profilePHL - Philadelphia
Full on-time, delay-cause, and seasonal performance for Philadelphia, PA.
PHL on-time profileCompare the two airports
See GSP and PHL side by side on delays, cancellations, and reliability.
Compare GSP vs PHLOrigin-hub reliability standing
Among GSP's stronger departures
GSP → PHL posts a 85.5% on-time rate, landing in the ≥85% band with 9 of 14 BTS-tracked routes leaving Greer. The same hub also shows 5 mid-band and 0 challenged departures · fleet-wide on-time rank #1056 of 4927 (highest on-time = #1).
Similar routes
Other BTS-tracked routes with comparable performance or trip length to GSP–PHL.
Routes with a similar on-time rate
What the Data Says About GSP to PHL
Greer to Philadelphia (GSP to PHL) is one of the more dependable pairings in the BTS On-Time Performance dataset: a 85.5% on-time rate across 2,248 flights, with delays that do happen averaging 96.6 minutes. The corridor runs roughly 515 miles and is served by 4 carriers. Over the most recent 24 months, 23 of 1,061 flights were cancelled (2.2%) and 0 diverted (0.0%).
The monthly split is wide on this route: Sep 2025 posted the strongest performance at 97% on-time, while Jul 2024 came in at just 69% - a 29-point swing worth factoring into travel timing.
On the multi-year calendar, GSP–PHL peaks in October at 95.8% on-time while May carries the heaviest traffic (~57 flights per month) ; the softest month is July at 74.6%, a 21.2-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.
Frequently Asked Questions
Where does GSP to PHL rank among US routes by traffic? ▼
How often are flights delayed from GSP to PHL? ▼
What is the cancellation rate for GSP to PHL? ▼
How far is the flight from GSP to PHL? ▼
When is the best time to fly from GSP to PHL? ▼
Airports on this route
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 GSP–PHL data
GSP–PHL runs 6.5 pts above the national 79% average; the remaining risk is month-to-month swing and carrier mix, not a weak headline rate.
- Compare GSP and PHL airport profiles: delay causes and top routes differ even on the same corridor. GSP airport
- If your dates flex, October (95.8% on-time) beats July (74.6%) on this corridor. Seasonal chart
- 4 other routes post a similar 85.5% 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.
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.