Route reliability record
ORD→GSP
Chicago to Greer
- Flights
- 1,872
- Period
- September 2025 to August 2026
- Distance
- 577 mi
- Carriers
- 6
This route carries a cancellation problem, not just a delay problem: 3.6% of scheduled flights never operate, against 1.9% nationally. Of the ones that do fly, close to three flights in four arrive on time, worth a C− overall. The punctuality figure counts only flights that actually departed, so it flatters an operation that cancels this often. That rests on 1,872 ORD to GSP flights, of which Envoy Air flew 865 at 78.3% on time.
Best time to fly ORD to GSP: a 8am–11am departure, ideally on a Tuesday. Flights in that window arrived on time 85.6% of the time and Tuesday flights 77.5%, against 74.2% for the route overall.
The US average over the same twelve months is 77.3%, so there is little to separate this route from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.
Key figures
On time
74.2%
Arrivals under 15 minutes late, of 1,799 completed flights
Avg delay
72 min
Across delayed arrivals only, not all flights
Cancelled
3.63%
National rate is 1.89%
Best carrier
Envoy
78.3% on time across 865 flights
These figures cover 1,872 flights between September 2025 and August 2026. Beyond the headline rate, 9.8% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Carrier by carrier
Which airline is most reliable on ORD to GSP
The choice of carrier is not cosmetic here. Envoy Air arrives on time 78.3% of the time; SkyWest Airlines manages 69.0%. Sample sizes sit next to every figure, because a two-point gap across 630 flights means less than a ten-point one.
| 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 | 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+ |
Envoy Air 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.
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.
Best ways to make this trip
The most reliable ways to fly Chicago to Greer
Every airline on this route and on the routes between nearby airports, ranked by how often a scheduled flight actually operated and arrived on time. 2 of the top 4 use a different airport at one end.
| Option | Airline | Success | On time | Cancelled | Best departure | Most punctual flight |
|---|---|---|---|---|---|---|
| 1. ORD → AVLChicago to Asheville | Envoy Air | 78.5% | 80.7% | 2.74% | 8am–11am, Wed | — |
| 2. ORD → GSPChicago to Greer | Envoy Air | 75.5% | 78.3% | 3.58% | 8am–11am, Sat | — |
| 3. ORD → AVLChicago to Asheville | SkyWest Airlines | 68.4% | 70.0% | 2.28% | 5am–8am, Tue | — |
| 4. ORD → GSPChicago to Greer | SkyWest Airlines | 66.7% | 69.0% | 3.33% | 5am–8am, Thu | — |
Success is the share of scheduled flights that operated and arrived less than 15 minutes late, so a cancelled flight counts against it. “(route)” means the best time comes from every carrier on the route rather than this airline alone.
Departure window
The best time of day to leave
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 19 points, against 9 points between the best and worst carrier.
- 5am–8am135 flights79.1%
- 8am–11am379 flights85.6%
- 11am–2pm38 flights70.3%
- 2pm–5pm514 flights74.9%
- 5pm–8pm570 flights67.8%
- 8pm–5am236 flights66.8%
Scale runs 60% to 90%.
Book the morning departure. Flights leaving between 8am–11am arrive on time 85.6% of the time, against 66.8% for the overnight window. That is 19 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 570 flights scheduled in it.
Explore
Filter ORD to GSP by airline, time, month and day
Pick a breakdown and a carrier. The dashed mark on each row is the same slice for every US flight.
On ORD to GSP, the best departure window is 8am–11am at 85.6% on time and the worst is 8pm–5am at 66.8%, a wide gap of 18.8 points. All US flights leaving 8am–11am ran 83.9%.
- 5–8am79.1%
- 8–11am85.6%
- 11am–2pm70.3%
- 2–5pm74.9%
- 5–8pm67.8%
- 8pm–5am66.8%
best all US flightsScale 60% to 95%.
Across the year
When delays peak on this route
This route's year swings by 20 points from best month to worst, which is wide. An annual average tells you very little about the week you are actually flying, so read the strip rather than the headline if your dates are fixed.
January is the weak month at 64.2% on time, against 84.3% in April. 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. August was the busiest month here, with 204 flights.
Across the week, Tuesday is the strongest day at 77.5% on time and Wednesday the weakest at 70.4%, a spread of 7 points.
Delay causes
Why this route gets delayed
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 33,000 reported delay minutes.
- 40%Late-arriving aircraft
- 27%Carrier
- 24%National Airspace System
- 9%Extreme weather
40% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 33,000 reported delay minutes here, that single category outweighs weather by 4 to one. The split is drawn from 33,450 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 85.6% on time here.
Cancellations run at 3.63%, against 1.89% 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 actually costs
9.8% 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 75.9% on time across 1,870 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.
The sample behind these figures is 1,872 flights, enough that the headline rate is stable to within roughly a point. The hour-block and month splits divide that further, so read the thinner bars with more caution than the headline.
Work out the risk of missing a connection in GSP after this flight
What to do with this
Booking this route
Put together: the delay figures matter less here than the 3.63% cancellation rate. A late arrival costs you a little over an hour; 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. 1,799 completed flights over 12 months sit behind that.
Common questions
ORD to GSP questions
How often is ORD to GSP delayed?
About one flight in four arrives at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 25.8% of the 1,872 flights in this analysis, against 22.7% nationally. Delayed flights are late by a little over an hour on average.
Which airline is most reliable on ORD to GSP?
Envoy Air leads at 78.3% on time across 865 flights. SkyWest Airlines is at the other end on 69.0%, a gap of 9 points. Sample size matters as much as the percentage: a rate built from a few hundred flights moves around far more than one built from ten thousand.
What time of day has the fewest delays on ORD to GSP?
The 8am–11am departure window is the strongest at 85.6% on time. The 8pm–5am window is the weakest at 66.8%, 19 points behind. Later departures inherit delays from earlier flights the same aircraft has already flown, which is why the curve slopes the way it does.
How bad are January delays on ORD to GSP?
January is the weakest month at 64.2% on time, compared with 84.3% in April. Across the year that is 20 points between the best and worst months. Moving flexible dates out of that month is one of the few things that reliably helps.
Related
Where to go next
- GSP to ORD — the return legseparate record
- Chicago O'Hare International (ORD) delay statistics
- Republic Airways on ORD to GSP81.1%
- Envoy Air on ORD to GSP78.3%
- SkyWest Airlines on ORD to GSP69.0%
- ORD to LGA, a related route66.6%
- ATL to GSP, a related route83.7%
- ORD to BOS, a related route66.6%
- United Airlines on-time record100.0%
- Republic Airways on-time record81.1%
- Envoy Air on-time record78.3%
- The US routes with the most cancellations
- Why the first flight of the morning is statistically safest
Direction matters. ORD to GSP and GSP to ORD are scored separately because they are separate operations, with different departure banks and different aircraft. Compare the return leg.
Embed ORD to GSP’s on-time badge on your site
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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.