Route reliability record
EWR→GSP
Newark to Greer
- Flights
- 784
- Period
- September 2025 to August 2026
- Distance
- 594 mi
- Carriers
- 1
This route carries a cancellation problem, not just a delay problem: 6.6% 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 EWR to GSP flights, with a median arrival 14 minutes early.
Best time to fly EWR to GSP: a 5am–8am departure, ideally on a Friday. Flights in that window arrived on time 100.0% of the time and Friday flights 89.9%, against 86.2% for the route overall.
Set against the rest of the country, this route's record is 9 points better than the US average of 77.3%. That gap is worth roughly 89 fewer late arrivals for every thousand flights.
Key figures
On time
86.2%
Arrivals under 15 minutes late, of 732 completed flights
Avg delay
67 min
Across delayed arrivals only, not all flights
Cancelled
6.63%
National rate is 1.89%
Best carrier
Republic
86.2% on time across 784 flights
These figures cover 784 flights between September 2025 and August 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.
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Carrier by carrier
Which airline is most reliable on EWR to GSP
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 | 86.2% | 67 min | 6.63% | A− |
Timetable by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Best ways to make this trip
The most reliable ways to fly Newark to Greer
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. EWR → GSPNewark to Greer | Republic Airways | 80.5% | 86.2% | 6.63% | 5am–8am, Fri | — |
| 2. LGA → GSPNew York to Greer | Republic Airways | 69.7% | 74.7% | 6.67% | 8am–11am, Sat | YX 4787 20:27 |
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–8am46 flights100.0%
- 8am–11am267 flights90.6%
- 11am–2pm—
- 2pm–5pm88 flights90.8%
- 5pm–8pm91 flights81.2%
- 8pm–5am292 flights79.5%
Scale runs 70% to 100%. Rows with fewer than 30 flights show a dash.
Book the early departure. Flights leaving between 5am–8am arrive on time 100.0% of the time, against 79.5% for the overnight 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 8pm–5am window is the busiest, with 292 flights scheduled in it.
Explore
Filter EWR to GSP 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 EWR to GSP, the best departure window is 5am–8am at 100.0% on time and the worst is 8pm–5am at 79.5%, a wide gap of 20.5 points. All US flights leaving 5am–8am ran 89.3%.
- 5–8am100.0%
- 8–11am90.6%
- 11am–2pm—
- 2–5pm90.8%
- 5–8pm81.2%
- 8pm–5am79.5%
best all US flightsScale 60% to 100%. 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.
July is the worst month at 77.9% on time, 16 points below May, the best at 93.4%. 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. July was the busiest month here, with 93 flights.
Across the week, Friday is the strongest day at 89.9% on time and Sunday the weakest at 81.6%, a spread of 8 points.
Delay causes
Why this route gets delayed
Late-arriving aircraft accounts for 50% of the 6,747 delay minutes carriers reported here, and the remaining four split what is left.
- 50%Late-arriving aircraft
- 24%National Airspace System
- 16%Carrier
- 9%Extreme weather
50% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 6,747 reported delay minutes here, that single category outweighs weather by 6 to one. The split is drawn from 6,747 reported delay minutes.
The practical consequence: the 5am–8am departure is the one that starts clean. Its aircraft has no earlier leg to be late from, which is exactly why that window shows 100.0% on time here.
Cancellations run at 6.63%, against 1.89% nationally. That is about 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 about 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 86.9% 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 GSP after this flight
What to do with this
Booking this route
Put together: the delay figures matter less here than the 6.63% cancellation rate. A late arrival costs you about 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. 732 completed flights over 12 months sit behind that.
Common questions
EWR to GSP questions
How often is EWR to GSP 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 13.8% of the 784 flights in this analysis, against 22.7% nationally. Delayed flights are late by about an hour on average.
How reliable is EWR to GSP compared with the rest of the country?
86.2% of flights arrive on time here against a national 77.3%, a difference of 9 points in its favour. That is worth a A− on this site's grading scale.
What time of day has the fewest delays on EWR to GSP?
The 5am–8am departure window is the strongest at 100.0% on time. The 8pm–5am window is the weakest at 79.5%, 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 July delays on EWR to GSP?
July is the weakest month at 77.9% on time, compared with 93.4% 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
- GSP to EWR — the return legseparate record
- Newark Liberty International (EWR) delay statistics
- EWR to MCO, a related route77.9%
- ATL to GSP, a related route83.7%
- EWR to ATL, a related route76.9%
- Republic Airways on-time record86.2%
- The US routes with the most cancellations
- Why the first flight of the morning is statistically safest
Direction matters. EWR to GSP and GSP to EWR 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.