Route reliability record
GSP→EWR
Greer to Newark
- Flights
- 769
- Period
- July 2025 to June 2026
- Distance
- 594 mi
- Carriers
- 1
This route carries a cancellation problem, not just a delay problem: 4.3% of scheduled flights never operate, against 1.8% 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 769 GSP to EWR flights, with a median arrival 14 minutes early.
Best time to fly GSP to EWR: a 5am–8am departure, ideally on a Wednesday. Flights in that window arrived on time 92.4% of the time and Wednesday flights 89.0%, against 85.2% for the route overall.
Set against the rest of the country, this route's record is 8 points better than the US average of 77.6%. That gap is worth roughly 76 fewer late arrivals for every thousand flights.
Key figures
On time
85.2%
Arrivals under 15 minutes late, of 736 completed flights
Avg delay
96 min
Across delayed arrivals only, not all flights
Cancelled
4.29%
National rate is 1.81%
Best carrier
Republic
85.2% on time across 769 flights
These figures cover 769 flights between July 2025 and June 2026. The median arrival is 14 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.
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 | 769 | 85.2% | 96 min | 4.29% | A− |
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 | 81.5% | 85.2% | 4.29% | 5am–8am, Wed | — |
| 2. GSP → LGAGreer to New York | Republic Airways | 71.4% | 76.3% | 6.42% | 8am–11am, Sat | YX 4751 06:05 |
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 27 points, against half a point between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am301 flights92.4%
- 8am–11am90 flights86.5%
- 11am–2pm206 flights90.4%
- 2pm–5pm—
- 5pm–8pm172 flights65.0%
- 8pm–5am—
Scale runs 55% to 100%. Rows with fewer than 30 flights show a dash.
Book the early departure. Flights leaving between 5am–8am arrive on time 92.4% of the time, against 65.0% for the evening window. That is 27 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 301 flights scheduled in it.
Across the year
When delays peak on this route
This route's year swings by 23 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.
July is the worst month at 72.0% on time, 23 points below May, the best at 94.5%. Summer afternoon convection and peak-season schedules land on the same weeks every year, so this is a pattern you can book around rather than a run of bad luck. May was the busiest month here, with 92 flights.
Across the week, Wednesday is the strongest day at 89.0% on time and Sunday the weakest at 79.8%. 9 points is a smaller lever than departure hour, but it is free.
Delay causes
Why this route gets delayed
One category carries most of the weight here. National Airspace System accounts for 48% of the 10,000 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.
- 48%National Airspace System
- 27%Carrier
- 23%Late-arriving aircraft
- 2%Extreme weather
48% 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 5,064 minutes out of 10,000, against a national NAS share of 21%. The split is drawn from 10,495 reported delay minutes.
Cancellations run at 4.29%, against 1.81% nationally. That is about one flight in 25 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
6.9% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last an hour and a half, 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. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.
The return leg runs 84.3% on time across 769 flights, within about 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. 769 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 4.29% cancellation rate. A late arrival costs you an hour and a half; 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. 736 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 seven arrives at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 14.8% of the 769 flights in this analysis, against 22.4% nationally. Delayed flights are late by an hour and a half on average.
How reliable is GSP to EWR compared with the rest of the country?
85.2% of flights arrive on time here against a national 77.6%, a difference of 8 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 92.4% on time. The 5pm–8pm window is the weakest at 65.0%, 27 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 July delays on GSP to EWR?
July is the weakest month at 72.0% on time, compared with 94.5% in May. Across the year that is 23 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 route90.4%
- MCO to EWR, a related route73.8%
- GSP to ORD, a related route74.9%
- Republic Airways on-time record85.2%
- 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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.