Carrier route record
OOORD→GSP
SkyWest Airlines · Chicago to Greer
- Flights
- 630
- Period
- September 2025 to August 2026
- Share of route
- 34%
- Carriers
- 6
Historical statistics for September 2025 to August 2026, not live status. For today’s flights, check with SkyWest Airlines.
SkyWest on ORD to GSP sits in the middle of the pack with a C−. About seven flights in ten arrive on time by the DOT's definition, 8 points worse than the national rate of 77.3%. The late ones land about an hour behind schedule. That rests on 630 flights, with a median arrival 2 minutes late.
The national on-time rate over the same period is 77.3%, so SkyWest on ORD to GSP runs 8 points behind the country as a whole. Across a thousand flights that is about 83 extra late arrivals.
Key figures
On time
69.0%
Arrivals under 15 minutes late, of 607 completed flights
Avg delay
66 min
Across delayed arrivals only, not all flights
Cancelled
3.33%
National rate is 1.89%
Whole route
74.2%
Every carrier on ORD to GSP, 1,872 flights
These figures cover 630 flights between September 2025 and August 2026. Beyond the headline rate, 9.9% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Carrier by carrier
SkyWest against every carrier on ORD to GSP
SkyWest flew 630 of the 1,872 flights on ORD to GSP, about 34% of it. Its 69.0% on time is 5 points worse than the route as a whole, which runs 74.2%. Ranked by on-time rate it is number four of six carriers on the route, where the range runs from United at 100.0% to PSA at 54.0%. Four of those carriers flew fewer than 365 flights here, so treat their positions as rough.
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 |
|---|---|---|---|---|---|
| United Airlinesthin sample | 4 | 100.0% | — | 0.00% | A+ |
| Republic Airwaysthin sample | 255 | 81.1% | 75 min | 4.31% | B− |
| Envoy Air | 865 | 78.3% | 72 min | 3.58% | B− |
| SkyWest Airlines (this page) | 630 | 69.0% | 66 min | 3.33% | C− |
| American Airlinesthin sample | 54 | 59.2% | 53 min | 9.26% | D− |
| PSA Airlinesthin sample | 64 | 54.0% | 123 min | 0.00% | F+ |
Timetable by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Departure window
When SkyWest runs best on this route
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 21 points, against half a point between the best and worst carrier.
- 5am–8am115 flights75.4%
- 8am–11am50 flights60.0%
- 11am–2pm3 flights—
- 2pm–5pm288 flights74.8%
- 5pm–8pm153 flights54.4%
- 8pm–5am21 flights—
Scale runs 45% to 80%. Rows with fewer than 30 flights show a dash.
The 5pm–8pm window is where this operation falls apart: 54.4% on time, against 75.4% 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 2pm–5pm window is the busiest, with 288 flights scheduled in it.
Across the year
SkyWest on ORD to GSP through the year
January is the weak month at 54.8% on time, against 75.8% in June. 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. July was the busiest month here, with 93 flights.
Across the week, Thursday is the strongest day at 74.2% on time and Sunday the weakest at 61.6%, a spread of 13 points.
Arrival by arrival
How late SkyWest on ORD to GSP runs when it is late
The 188 late arrivals split 69 under half an hour, 59 between 30 and 60 minutes, and 60 an hour or more.
- 15+ min early115 flights18.9%
- Within 15 min304 flights50.1%
- 15–29 min late69 flights11.4%
- 30–59 min late59 flights9.7%
- 1–2 hours late40 flights6.6%
- 2+ hours late20 flights3.3%
Scale runs 0% to 100%.
Share of 607 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 117 departures that left 15 minutes late or more, only 11 made it up before arrival. In the other direction, 82 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at GSP.
The worst days
Worst days for SkyWest on ORD to GSP
The latest arrival of the period was on 17 June 2026, 15 hours 40 minutes behind schedule; most of its delay minutes were filed as extreme weather. Three of the five worst days fell in June 2026.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 17 June 2026 | 15 hours 40 minutes | Extreme weather |
| 24 June 2026 | 13 hours 22 minutes | Carrier |
| 18 May 2026 | 4 hours 47 minutes | Carrier |
| 11 June 2026 | 4 hours 41 minutes | Late-arriving aircraft |
| 4 July 2026 | 4 hours 35 minutes | Late-arriving aircraft |
Delay causes
Why SkyWest runs late on this route
Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 12,000 reported delay minutes.
- 42%Carrier
- 25%National Airspace System
- 22%Late-arriving aircraft
- 12%Extreme weather
Extreme weather accounts for 12% of delay minutes, well above the single-digit share typical across the system. Weather delays are lumpy: they arrive as whole bad days rather than as a steady drag, so the monthly strip above is the more useful view of the risk. The national share is 6%, so this operation carries roughly 2.0 times the usual weather exposure. The split is drawn from 12,370 reported delay minutes.
The largest share of delay minutes, 42%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 5,169 of the 12,000 delay minutes reported here.
Cancellations run at 3.33%, against 1.89% nationally. That is about 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
9.9% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection 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.
The return leg runs 71.4% on time across 630 flights, within 2 points 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. 630 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 SkyWest on ORD to GSP
Put together: the delay figures matter less here than the 3.33% cancellation rate. A late arrival costs you about 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. 607 completed flights over 12 months sit behind that.
Related
Where to go next
- ORD to GSP, every carrier
- SkyWest on GSP to ORD, the return leg
- Republic Airways on ORD to GSP81.1%
- Envoy Air on ORD to GSP78.3%
- SkyWest Airlines network-wide record
- Chicago O'Hare International (ORD) delay statistics
- The US routes with the most cancellations
- What a cancellation rate actually tells you (and what it hides)
Source: US DOT Bureau of Transportation Statistics, on-time performance data, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.