Flight number record
YX 4787
Republic Airways · New York to Greer
- Route
- LGA → GSP
- Departs
- 19:55
- Flights
- 311
- Period
- July 2025 to June 2026
Historical statistics for July 2025 to June 2026, not live status. For today’s YX 4787, check with Republic Airways. Republic Airways flies under contract for larger airlines, so a ticket for this flight may show a different airline code and number.
YX 4787 sits in the middle of the pack with a C−. About seven flights in ten arrive on time by the DOT's definition, 6 points worse than the national rate of 77.6%. The late ones land a little over an hour behind schedule. That rests on 311 flights, with a median arrival 11 minutes early.
The national on-time rate over the same period is 77.6%, so YX 4787 runs 6 points behind the country as a whole. Across a thousand flights that is about 59 extra late arrivals.
Key figures
On time
71.7%
Arrivals under 15 minutes late, of 276 completed flights
Avg delay
79 min
Across delayed arrivals only, not all flights
Cancelled
11.25%
National rate is 1.81%
1 hour+ late
12.0%
National rate is 8.1%
These figures cover 311 flights between July 2025 and June 2026. Beyond the headline rate, 12.0% 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.
Schedule
When YX 4787 flies
YX 4787 flies LGA to GSP without a single fixed slot. Its most common scheduled departure was 19:55, used on 69 of 311 flights, with 19:59 (57 flights) and 20:27 (50 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.
- Departs 19:5569 flights22.2%
- Departs 19:5957 flights18.3%
- Departs 20:2750 flights16.1%
Scale runs 0% to 100%. Rows with fewer than 30 flights show a dash.
Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.
A 19:55 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.2%, and YX 4787 runs 4 points better at 71.7%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
Against the route
YX 4787 next to LGA to GSP
Every carrier on LGA to GSP combined arrived on time 76.8% of the time across 934 flights, so YX 4787 is 5 points behind it. Across its whole network Republic Airways managed 78.5%, which this flight trails by 7 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| YX 4787thin sample | 311 | 71.7% | 79 min | 11.25% | C− |
| All Republic Airways on LGA–GSP | 934 | 76.8% | 68 min | 7.39% | B− |
| All carriers on LGA–GSP | 934 | 76.8% | 68 min | 7.39% | B− |
| Republic Airways, whole network | 361,482 | 78.5% | 72 min | 4.08% | B− |
Across the year
YX 4787 quarter by quarter
YX 4787 did not run the same all year. Its best quarter was Jul–Sep 2025 at 81.5% on time and its weakest Oct–Dec 2025 at 63.5%, a swing of 18 points on roughly 78 flights a quarter. The twelve-month rate averages over that, so if you are flying in a weak quarter the quarter's own figure is the better guide.
- Jul–Sep 202578 flights81.5%
- Oct–Dec 202579 flights63.5%
- Jan–Mar 202682 flights73.5%
- Apr–Jun 202672 flights69.6%
Scale runs 55% to 85%. Rows with fewer than 30 flights show a dash.
By weekday, YX 4787 did best on Monday at 82.2% on time and worst on Sunday at 58.7%. Each day rests on about 44 flights, so a gap of 24 points is worth noticing but could still narrow in another year.
Delay causes
Why YX 4787 runs late
One category carries most of the weight here. Late-arriving aircraft accounts for 60% of the 6,149 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.
- 60%Late-arriving aircraft
- 24%Carrier
- 16%National Airspace System
- 0%Extreme weather
60% 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 6,149 reported delay minutes here, that single category outweighs weather by 60 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 6,149 delay minutes reported on YX 4787.
Cancellations run at 11.25%, against 1.81% nationally. That is about one flight in nine 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 routes
What a delay on this flight costs
For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 12.0% of arrivals land a full hour or more behind schedule, against 8.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum here, and two hours if the onward flight is on a separate ticket.
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.
Every one of the 311 flights under YX 4787 in the data flew LGA to GSP. The number was not reused on any other city pair, which makes this a clean record of one route.
One caution: this is a thin sample. 311 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.
What to do with this
Booking YX 4787
For a booking, the cancellation rate is the figure to plan around on YX 4787: 11.25% of its 311 scheduled flights did not operate. A late arrival costs a little over an hour, but a cancellation costs the day, so leave a later option open.
Related
Where to go next
- LGA to GSP, every carrier and departure
- GSP to LGA, the return direction
- LaGuardia (LGA) delay statistics
- Republic Airways on-time record
- Every Republic Airways flight number with a record
- The most and least reliable flight numbers in the US
- Why the first flight of the morning is statistically safest
A flight number here means Republic Airways’s own number as it reports to the DOT. How the figures are computed is on the methodology page.
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.