Route reliability record
LGA→GSP
New York to Greer
- Flights
- 934
- Period
- July 2025 to June 2026
- Distance
- 610 mi
- Carriers
- 1
This route carries a cancellation problem, not just a delay problem: 7.4% of scheduled flights never operate, against 1.8% nationally. Of the ones that do fly, close to three flights in four arrive on time, worth a B− overall. The punctuality figure counts only flights that actually departed, so it flatters an operation that cancels this often. That rests on 934 LGA to GSP flights, with a median arrival 9 minutes early.
Best time to fly LGA to GSP: a 8am–11am departure, ideally on a Saturday. Flights in that window arrived on time 83.5% of the time and Saturday flights 85.0%, against 76.8% for the route overall.
The US average over the same twelve months is 77.6%, so there is little to separate this route from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.
Key figures
On time
76.8%
Arrivals under 15 minutes late, of 865 completed flights
Avg delay
68 min
Across delayed arrivals only, not all flights
Cancelled
7.39%
National rate is 1.81%
Best carrier
Republic
76.8% on time across 934 flights
These figures cover 934 flights between July 2025 and June 2026. Beyond the headline rate, 8.9% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.
Carrier by carrier
Which airline is most reliable on LGA 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 | 934 | 76.8% | 68 min | 7.39% | B− |
Flight by flight
Flights on LGA to GSP
The flight numbers below flew this route at least 250 times in the period, busiest first. Each has its own record, with its schedule and delay causes.
Best ways to make this trip
The most reliable ways to fly New York 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 | 80.4% | 84.3% | 4.68% | 5am–8am, Mon | — |
| 2. LGA → GSPNew York to Greer | Republic Airways | 71.1% | 76.8% | 7.39% | 8am–11am, Sat | YX 4787 19:55 |
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 12 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–8am1 flights—
- 8am–11am280 flights83.5%
- 11am–2pm21 flights—
- 2pm–5pm333 flights74.9%
- 5pm–8pm11 flights—
- 8pm–5am288 flights71.5%
Scale runs 65% to 90%. Rows with fewer than 30 flights show a dash.
Book the morning departure. Flights leaving between 8am–11am arrive on time 83.5% of the time, against 71.5% for the overnight window. That is 12 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 2pm–5pm window is the busiest, with 333 flights scheduled in it.
Across the year
When delays peak on this route
This route's year swings by 34 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.
December is the weak month at 56.7% on time, against 90.6% in January. Winter delays cluster: a single storm system can account for most of a month's shortfall, so an average December hides both very good weeks and genuinely unflyable days. October was the busiest month here, with 84 flights.
Across the week, Saturday is the strongest day at 85.0% on time and Sunday the weakest at 69.6%. 15 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. Late-arriving aircraft accounts for 58% of the 14,000 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.
- 58%Late-arriving aircraft
- 25%National Airspace System
- 17%Carrier
- 0%Extreme weather
58% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 14,000 reported delay minutes here, that single category outweighs weather by 58 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 13,697 reported delay minutes.
The practical consequence: the 8am–11am departure is the one that starts clean. Its aircraft has no earlier leg to be late from, which is exactly why that window shows 83.5% on time here.
Cancellations run at 7.39%, against 1.81% 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
8.9% 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 a little over an hour, which a normal layover absorbs.
The 610 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 76.3% on time across 934 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. 934 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 7.39% cancellation rate. A late arrival costs you a little over an hour; a cancelled flight costs you the day. Book the 8am–11am departure so there is still a schedule behind you if it goes wrong, and treat a same-day connection as optimistic. 865 completed flights over 12 months sit behind that.
Common questions
LGA to GSP questions
How often is LGA to GSP delayed?
About one flight in four arrives at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 23.2% of the 934 flights in this analysis, against 22.4% nationally. Delayed flights are late by a little over an hour on average.
How reliable is LGA to GSP compared with the rest of the country?
76.8% of flights arrive on time here against a national 77.6%, a difference of about a point against it. That is worth a B− on this site's grading scale.
What time of day has the fewest delays on LGA to GSP?
The 8am–11am departure window is the strongest at 83.5% on time. The 8pm–5am window is the weakest at 71.5%, 12 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 December delays on LGA to GSP?
December is the weakest month at 56.7% on time, compared with 90.6% in January. Across the year that is 34 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 LGA — the return legseparate record
- LaGuardia (LGA) delay statistics
- LGA to ORD, a related route67.3%
- ATL to GSP, a related route83.9%
- LGA to ATL, a related route76.6%
- Republic Airways on-time record76.8%
- The US routes with the most cancellations
- Why the first flight of the morning is statistically safest
Direction matters. LGA to GSP and GSP to LGA are scored separately because they are separate operations, with different departure banks and different aircraft. Compare the return leg.
Embed LGA to GSP’s on-time badge on your site
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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.