Carrier route record
YXORD→GSP
Republic Airways · Chicago to Greer
- Flights
- 312
- Period
- July 2025 to June 2026
- Share of route
- 17%
- Carriers
- 6
Historical statistics for July 2025 to June 2026, not live status. For today’s flights, check with Republic Airways.
Republic on ORD to GSP lands a B−, 3 points better than the national rate of 77.6%. About one flight in five arrives 15 minutes late or worse, and those flights are late by an hour and a half on average. That is a workable record, not a spotless one. That rests on 312 flights. The strongest carrier on the route with a full sample, Envoy Air, flew 778 at 76.7% on time.
The US average over the same twelve months is 77.6%, so there is little to separate Republic on ORD to GSP from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.
Key figures
On time
80.2%
Arrivals under 15 minutes late, of 298 completed flights
Avg delay
86 min
Across delayed arrivals only, not all flights
Cancelled
4.49%
National rate is 1.81%
Whole route
72.9%
Every carrier on ORD to GSP, 1,799 flights
These figures cover 312 flights between July 2025 and June 2026. Beyond the headline rate, 8.7% 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
Republic against every carrier on ORD to GSP
Republic flew 312 of the 1,799 flights on ORD to GSP, about 17% of it. Its 80.2% on time is 7 points better than the route as a whole, which runs 72.9%. Ranked by on-time rate it is number two of six carriers on the route, where the range runs from United at 100.0% to PSA at 48.7%. Three of those carriers flew fewer than 365 flights here, so treat their positions as rough.
The choice of carrier is not cosmetic here. Envoy Air arrives on time 76.7% of the time; SkyWest Airlines manages 69.7%. Sample sizes sit next to every figure, because a two-point gap across 528 flights means less than a ten-point one.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| United Airlinesthin sample | 1 | 100.0% | — | 0.00% | A+ |
| Republic Airways (this page)thin sample | 312 | 80.2% | 86 min | 4.49% | B− |
| Envoy Air | 778 | 76.7% | 61 min | 3.34% | B− |
| SkyWest Airlines | 528 | 69.7% | 69 min | 3.60% | C− |
| American Airlinesthin sample | 54 | 59.2% | 53 min | 9.26% | D− |
| PSA Airlinesthin sample | 126 | 48.7% | 122 min | 6.35% | F− |
SkyWest Airlines cancels 3.6% of what it schedules here, the highest in the table. A cancelled flight never appears in an on-time rate, so read that column alongside the punctuality one rather than after it.
Departure window
When Republic runs best on this route
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 11 points, against 7 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am4 flights—
- 8am–11am40 flights89.7%
- 11am–2pm—
- 2pm–5pm38 flights78.4%
- 5pm–8pm224 flights79.1%
- 8pm–5am6 flights—
Scale runs 70% to 95%. Rows with fewer than 30 flights show a dash.
Book the morning departure. Flights leaving between 8am–11am arrive on time 89.7% of the time, against 78.4% for the afternoon window. That is 11 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 5pm–8pm window is the busiest, with 224 flights scheduled in it.
Across the year
Republic on ORD to GSP through the year
- Jul–Sep 2025133 flights78.5%
- Oct–Dec 202596 flights77.5%
- Jan–Mar 202639 flights80.0%
- Apr–Jun 202644 flights90.9%
Scale runs 70% to 95%. Rows with fewer than 30 flights show a dash.
Monthly volumes are too low here to break the year into twelve reliable readings. What the twelve-month total says is 80.2% on time across 312 flights.
Republic on ORD to GSP did not run the same all year. Its best quarter was Apr–Jun 2026 at 90.9% on time and its weakest Oct–Dec 2025 at 77.5%, a swing of 13 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.
Across the week, Tuesday is the strongest day at 88.6% on time and Sunday the weakest at 64.7%. 24 points is a smaller lever than departure hour, but it is free.
Delay causes
Why Republic runs late on this route
One category carries most of the weight here. Late-arriving aircraft accounts for 56% of the 5,043 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.
- 56%Late-arriving aircraft
- 26%Carrier
- 11%National Airspace System
- 7%Extreme weather
56% 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 5,043 reported delay minutes here, that single category outweighs weather by 8 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 5,043 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 89.7% on time here.
Cancellations run at 4.49%, against 1.81% nationally. That is roughly one flight in twenty 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 costs
8.7% 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 577 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 is a different operation and performs like one: it runs 84.5% on time across 313 flights, 4 points above this direction. Departure banks, aircraft rotations and the congestion at each end all differ, so scoring the two directions together would average away a real 4 points of difference.
One caution: this is a thin sample. 312 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 Republic on ORD to GSP
Put together: the delay figures matter less here than the 4.49% cancellation rate. A late arrival costs you an hour and a half; 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. 298 completed flights over 12 months sit behind that.
Related
Where to go next
- ORD to GSP, every carrier
- Republic on GSP to ORD, the return leg
- Envoy Air on ORD to GSP76.7%
- SkyWest Airlines on ORD to GSP69.7%
- PSA Airlines on ORD to GSP48.7%
- Republic Airways network-wide record
- Chicago O'Hare International (ORD) delay statistics
- The US routes with the most cancellations
- Why the first flight of the morning is statistically safest
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.