Carrier route record

YXGSP→ORD

Republic Airways · Greer to Chicago

Flights: 313
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 GSP to ORD earns a B. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 7 points better than the national rate of 77.6%. When something does go wrong the average delay runs a little over an hour. That rests on 313 flights. The strongest carrier on the route with a full sample, Envoy Air, flew 775 at 72.5% on time.

Set against the rest of the country, Republic's GSP to ORD record is 7 points better than the US average of 77.6%. That gap is worth roughly 69 fewer late arrivals for every thousand flights.

On time

84.5%

Arrivals under 15 minutes late, of 303 completed flights

Avg delay

79 min

Across delayed arrivals only, not all flights

Cancelled

2.88%

National rate is 1.81%

Whole route

74.9%

Every carrier on GSP to ORD, 1,797 flights

These figures cover 313 flights between July 2025 and June 2026. The median arrival is 15 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

Republic against every carrier on GSP to ORD

Republic flew 313 of the 1,797 flights on GSP to ORD, about 17% of it. Its 84.5% on time is 10 points better than the route as a whole, which runs 74.9%. 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 SkyWest at 70.4%. Three of those carriers flew fewer than 365 flights here, so treat their positions as rough.

The two carriers here are closely matched: 2 points separate the best from the worst. At that spread, schedule and price are better tie-breakers than reliability. Sample sizes are shown so you can see which rows are worth weighing.

On-time performance by carrier on GSP to ORD
Airline	Flights	On time	Avg delay	Cancelled	Grade
United Airlinesthin sample	1	100.0%	—	0.00%	A+
Republic Airways (this page)thin sample	313	84.5%	79 min	2.88%	B
PSA Airlinesthin sample	127	82.9%	64 min	2.36%	B
American Airlinesthin sample	54	77.6%	56 min	9.26%	B−
Envoy Air	775	72.5%	66 min	3.48%	C−
SkyWest Airlines	527	70.4%	83 min	4.74%	C−

SkyWest Airlines cancels 4.7% 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 44 points, against 2 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.

5am–8am43 flights90.7%
8am–11am189 flights89.8%
11am–2pm39 flights89.5%
2pm–5pm2 flights—
5pm–8pm37 flights47.1%
8pm–5am3 flights—

Scale runs 40% to 95%. Rows with fewer than 30 flights show a dash.

The 5pm–8pm window is where this operation falls apart: 47.1% on time, against 90.7% for the 5am–8am slot. By evening the aircraft flying these rotations have absorbed a full day of small delays and there is no slack left to recover in. The 8am–11am window is the busiest, with 189 flights scheduled in it.

Across the year

Republic on GSP to ORD through the year

Jul–Sep 2025133 flights89.4%
Oct–Dec 202597 flights85.7%
Jan–Mar 202639 flights58.3%
Apr–Jun 202644 flights88.6%

Scale runs 50% 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 84.5% on time across 313 flights.

Republic on GSP to ORD did not run the same all year. Its best quarter was Jul–Sep 2025 at 89.4% on time and its weakest Jan–Mar 2026 at 58.3%, a swing of 31 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, Thursday is the strongest day at 92.9% on time and Sunday the weakest at 75.0%. 18 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. National Airspace System accounts for 45% of the 3,699 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.

National Airspace System
45%
Late-arriving aircraft
35%
Carrier
16%
Extreme weather
4%

35% 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 3,699 reported delay minutes here, that single category outweighs weather by 9 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 3,699 reported delay minutes.

45% 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 1,656 minutes out of 3,699, against a national NAS share of 21%.

Cancellations run at 2.88%, against 1.81% nationally. That is roughly one flight in 30 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

5.6% 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 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 80.2% on time across 312 flights, 4 points below 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. 313 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 GSP to ORD

Put together: the delay figures matter less here than the 2.88% cancellation rate. A late arrival costs you a little over 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. 303 completed flights over 12 months sit behind that.

Where to go next

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.

Key figures