Route reliability record
GSP→EWR
Greer to Newark
- Flights
- 784
- Period
- September 2025 to August 2026
- Distance
- 594 mi
- Carriers
- 1
This route carries a cancellation problem, not just a delay problem: 5.7% of scheduled flights never operate, against 1.9% nationally. Of the ones that do fly, more than four flights in five arrive on time, worth an A− overall. The punctuality figure counts only flights that actually departed, so it flatters an operation that cancels this often. That rests on 784 GSP to EWR flights, with a median arrival 15 minutes early.
Best time to fly GSP to EWR: a 5am–8am departure, ideally on a Friday. Flights in that window arrived on time 92.5% of the time and Friday flights 91.2%, against 86.9% for the route overall.
Set against the rest of the country, this route's record is 10 points better than the US average of 77.3%. That gap is worth roughly 96 fewer late arrivals for every thousand flights.
Key figures
On time
86.9%
Arrivals under 15 minutes late, of 739 completed flights
Avg delay
81 min
Across delayed arrivals only, not all flights
Cancelled
5.74%
National rate is 1.89%
Best carrier
Republic
86.9% on time across 784 flights
These figures cover 784 flights between September 2025 and August 2026. The median arrival is 15 minutes early, which is the part an average hides: most flights here are fine, and the on-time rate is decided by a tail of badly late ones. On-time means under 15 minutes late, the DOT's own threshold.
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Carrier by carrier
Which airline is most reliable on GSP to EWR
Only one carrier clears this site's 365-flight floor here, so there is no comparison to draw. The table below is the full picture.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Republic Airways | 784 | 86.9% | 81 min | 5.74% | A− |
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Best ways to make this trip
The most reliable ways to fly Greer to Newark
Every airline on this route and on the routes between nearby airports, ranked by how often a scheduled flight actually operated and arrived on time. 1 of the top 2 use a different airport at one end.
| Option | Airline | Success | On time | Cancelled | Best departure | Most punctual flight |
|---|---|---|---|---|---|---|
| 1. GSP → EWRGreer to Newark | Republic Airways | 81.9% | 86.9% | 5.74% | 5am–8am, Fri | — |
| 2. GSP → LGAGreer to New York | Republic Airways | 70.5% | 74.9% | 5.91% | 5am–8am, Sat | YX 4751 06:00 |
Success is the share of scheduled flights that operated and arrived less than 15 minutes late, so a cancelled flight counts against it. “(route)” means the best time comes from every carrier on the route rather than this airline alone.
Departure window
The best time of day to leave
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 21 points, against half a point between the best and worst carrier.
- 5am–8am294 flights92.5%
- 8am–11am47 flights87.2%
- 11am–2pm268 flights89.5%
- 2pm–5pm—
- 5pm–8pm157 flights71.4%
- 8pm–5am18 flights—
Scale runs 65% to 100%. Rows with fewer than 30 flights show a dash.
Book the early departure. Flights leaving between 5am–8am arrive on time 92.5% of the time, against 71.4% for the evening window. That is 21 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 5am–8am window is the busiest, with 294 flights scheduled in it.
Explore
Filter GSP to EWR by airline, time, month and day
Pick a breakdown and a carrier. The dashed mark on each row is the same slice for every US flight.
On GSP to EWR, the best departure window is 5am–8am at 92.5% on time and the worst is 5pm–8pm at 71.4%, a wide gap of 21.1 points. All US flights leaving 5am–8am ran 89.3%.
- 5–8am92.5%
- 8–11am87.2%
- 11am–2pm89.5%
- 2–5pm—
- 5–8pm71.4%
- 8pm–5am—
best all US flightsScale 60% to 95%. Cells under 30 flights show a dash.
Across the year
When delays peak on this route
This route's year swings by 16 points from best month to worst, which is wide. An annual average tells you very little about the week you are actually flying, so read the strip rather than the headline if your dates are fixed.
May is the best month on the calendar at 94.5% on time. Shoulder season thins the schedule and takes the summer weather with it, and the operation gets its margin back. July was the busiest month here, with 93 flights.
Across the week, Friday is the strongest day at 91.2% on time and Sunday the weakest at 81.2%, a spread of 10 points.
Delay causes
Why this route gets delayed
National Airspace System accounts for 44% of the 7,825 delay minutes carriers reported here, and the remaining four split what is left.
- 44%National Airspace System
- 28%Carrier
- 27%Late-arriving aircraft
- 0%Extreme weather
44% of delay minutes are charged to the National Airspace System: air traffic volume, runway configuration, ground stops. No carrier can price its way out of that, which is why airport choice moves the number here more than carrier choice does. That is 3,479 minutes out of 7,825, against a national NAS share of 21%. The split is drawn from 7,825 reported delay minutes.
Cancellations run at 5.74%, against 1.89% nationally. That is roughly one flight in fifteen cancelled outright. A cancelled flight is invisible in every on-time figure on this page, so the punctuality numbers above describe only the flights that actually operated.
Connections and stage length
What a delay here actually costs
5.5% of arrivals land an hour or more late, close to the national 8.3%, so a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last a little over an hour, which a normal layover absorbs.
The 594 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty.
The return leg runs 86.2% on time across 784 flights, within half a point of this direction. The two legs are scored separately because they usually differ; on this city pair they happen not to.
One caution: this is a thin sample. 784 flights over twelve months is enough to clear this site's floor but not enough to pin the rate down tightly, and a single bad week moves it by more than a point. Treat the grade as a rough reading.
Work out the risk of missing a connection in EWR after this flight
What to do with this
Booking this route
Put together: the delay figures matter less here than the 5.74% cancellation rate. A late arrival costs you a little over an hour; a cancelled flight costs you the day. Book the 5am–8am departure so there is still a schedule behind you if it goes wrong, and treat a same-day connection as optimistic. 739 completed flights over 12 months sit behind that.
Common questions
GSP to EWR questions
How often is GSP to EWR delayed?
About one flight in eight arrives at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 13.1% of the 784 flights in this analysis, against 22.7% nationally. Delayed flights are late by a little over an hour on average.
How reliable is GSP to EWR compared with the rest of the country?
86.9% of flights arrive on time here against a national 77.3%, a difference of 10 points in its favour. That is worth a A− on this site's grading scale.
What time of day has the fewest delays on GSP to EWR?
The 5am–8am departure window is the strongest at 92.5% on time. The 5pm–8pm window is the weakest at 71.4%, 21 points behind. Later departures inherit delays from earlier flights the same aircraft has already flown, which is why the curve slopes the way it does.
How bad are October delays on GSP to EWR?
October is the weakest month at 78.6% on time, compared with 94.5% in May. Across the year that is 16 points between the best and worst months. Moving flexible dates out of that month is one of the few things that reliably helps.
Related
Where to go next
- EWR to GSP — the return legseparate record
- Newark Liberty International (EWR) delay statistics
- GSP to ATL, a related route90.1%
- MCO to EWR, a related route75.0%
- GSP to ORD, a related route75.9%
- Republic Airways on-time record86.9%
- The US routes with the most cancellations
- What a cancellation rate actually tells you (and what it hides)
Direction matters. GSP to EWR and EWR to GSP are scored separately because they are separate operations, with different departure banks and different aircraft. Compare the return leg.
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Source: US DOT Bureau of Transportation Statistics, on-time performance data, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.