Carrier route record
OHORD→GSP
PSA Airlines · Chicago to Greer
- Flights
- 126
- Period
- July 2025 to June 2026
- Share of route
- 7%
- Carriers
- 6
Historical statistics for July 2025 to June 2026, not live status. For today’s flights, check with PSA Airlines.
PSA on ORD to GSP earns an F−, which is as low as this site's scale goes for a reason. Only 48.7% of flights arrive inside the 15-minute window, 29 points worse than the national rate of 77.6%. Late arrivals average close to two hours. Treat any tight connection here as a coin flip. That rests on 126 flights. The strongest carrier on the route with a full sample, Envoy Air, flew 778 at 76.7% on time.
The national on-time rate over the same period is 77.6%, so PSA on ORD to GSP runs 29 points behind the country as a whole. Across a thousand flights that is about 289 extra late arrivals.
Key figures
On time
48.7%
Arrivals under 15 minutes late, of 117 completed flights
Avg delay
122 min
Across delayed arrivals only, not all flights
Cancelled
6.35%
National rate is 1.81%
Whole route
72.9%
Every carrier on ORD to GSP, 1,799 flights
These figures cover 126 flights between July 2025 and June 2026. Beyond the headline rate, 29.1% 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
PSA against every carrier on ORD to GSP
PSA flew 126 of the 1,799 flights on ORD to GSP, about 7% of it. Its 48.7% on time is 24 points worse than the route as a whole, which runs 72.9%. Ranked by on-time rate it is last 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 Airwaysthin 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 Airlines (this page)thin 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 PSA runs best on this route
Departure time is the single lever a traveller controls, and it moves the odds more than most people expect. Each bar below is the on-time rate for flights scheduled to leave inside that window, across 126 flights.
There are not enough flights in each departure window to split PSA's ORD to GSP record by time of day without the percentages moving on noise. The headline rate of 48.7% is the reliable figure here.
Across the year
PSA on ORD to GSP through the year
- Jul–Sep 202592 flights51.2%
- Oct–Dec 202533 flights42.4%
- Jan–Mar 20261 flights—
Scale runs 35% to 55%. 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 48.7% on time across 126 flights.
Split by quarter, PSA on ORD to GSP logged 92 flights in Jul–Sep 2025, 33 flights in Oct–Dec 2025 and 1 flights in Jan–Mar 2026. Fewer than three of those quarters carried the 30 completed flights this site needs before printing a rate, so the 48.7% annual figure is the one to use.
Delay causes
Why PSA runs late on this route
One category carries most of the weight here. Late-arriving aircraft accounts for 58% of the 7,308 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
- 32%Carrier
- 6%National Airspace System
- 5%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 7,308 reported delay minutes here, that single category outweighs weather by 12 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 7,308 reported delay minutes.
Cancellations run at 6.35%, against 1.81% 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 costs
For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 29.1% 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 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 82.9% on time across 127 flights, 34 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 34 points of difference.
One caution: this is a thin sample. 126 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 PSA on ORD to GSP
Put together: the delay figures matter less here than the 6.35% cancellation rate. A late arrival costs you close to two hours; a cancelled flight costs you the day. Book the 5pm–8pm departure so there is still a schedule behind you if it goes wrong, and treat a same-day connection as optimistic. 117 completed flights over 12 months sit behind that.
Related
Where to go next
- ORD to GSP, every carrier
- PSA on GSP to ORD, the return leg
- Republic Airways on ORD to GSP80.2%
- Envoy Air on ORD to GSP76.7%
- SkyWest Airlines on ORD to GSP69.7%
- PSA Airlines 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.