Route reliability record
GSP→ORD
Greer to Chicago
- Flights
- 1,870
- Period
- September 2025 to August 2026
- Distance
- 577 mi
- Carriers
- 6
This route carries a cancellation problem, not just a delay problem: 3.8% 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 B− overall. The punctuality figure counts only flights that actually departed, so it flatters an operation that cancels this often. That rests on 1,870 GSP to ORD flights, of which Envoy Air flew 862 at 75.4% on time.
Best time to fly GSP to ORD: a 5am–8am departure, ideally on a Wednesday. Flights in that window arrived on time 86.2% of the time and Wednesday flights 79.8%, against 75.9% 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
75.9%
Arrivals under 15 minutes late, of 1,786 completed flights
Avg delay
72 min
Across delayed arrivals only, not all flights
Cancelled
3.80%
National rate is 1.89%
Best carrier
Envoy
75.4% on time across 862 flights
These figures cover 1,870 flights between September 2025 and August 2026. Beyond the headline rate, 8.7% 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 GSP to ORD
The two carriers here are closely matched: 4 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.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| United Airlinesthin sample | 4 | 100.0% | — | 0.00% | A+ |
| PSA Airlinesthin sample | 65 | 88.9% | 69 min | 1.54% | A |
| Republic Airwaysthin sample | 255 | 84.4% | 70 min | 3.53% | B− |
| American Airlinesthin sample | 54 | 77.6% | 56 min | 9.26% | B− |
| Envoy Air | 862 | 75.4% | 68 min | 3.60% | B− |
| SkyWest Airlines | 630 | 71.4% | 79 min | 3.97% | C− |
SkyWest Airlines cancels 4.0% 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.
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Best ways to make this trip
The most reliable ways to fly Greer to Chicago
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. GSP → ORDGreer to Chicago | Envoy Air | 72.7% | 75.4% | 3.60% | 5am–8am, Wed | — |
| 2. AVL → ORDAsheville to Chicago | SkyWest Airlines | 71.7% | 73.7% | 2.66% | 5am–8am, Fri | — |
| 3. AVL → ORDAsheville to Chicago | Envoy Air | 70.7% | 72.9% | 3.06% | 5am–8am, Sat | — |
| 4. GSP → ORDGreer to Chicago | SkyWest Airlines | 68.6% | 71.4% | 3.97% | 5am–8am, Sat | — |
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 28 points, against 4 points between the best and worst carrier.
- 5am–8am521 flights86.2%
- 8am–11am333 flights80.1%
- 11am–2pm340 flights82.4%
- 2pm–5pm44 flights85.4%
- 5pm–8pm456 flights57.9%
- 8pm–5am176 flights66.7%
Scale runs 50% to 90%.
The 5pm–8pm window is where this operation falls apart: 57.9% on time, against 86.2% 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 5am–8am window is the busiest, with 521 flights scheduled in it.
Explore
Filter GSP to ORD 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 GSP to ORD, the best departure window is 5am–8am at 86.2% on time and the worst is 5pm–8pm at 57.9%, a wide gap of 28.3 points. All US flights leaving 5am–8am ran 89.3%.
- 5–8am86.2%
- 8–11am80.1%
- 11am–2pm82.4%
- 2–5pm85.4%
- 5–8pm57.9%
- 8pm–5am66.7%
best all US flightsScale 50% to 95%.
Across the year
When delays peak on this route
This route's year swings by 27 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.
December is the weak month at 61.4% on time, against 88.1% in September. 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, Wednesday is the strongest day at 79.8% on time and Friday the weakest at 72.1%, a spread of 8 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 31,000 reported delay minutes.
- 31%National Airspace System
- 29%Carrier
- 28%Late-arriving aircraft
- 11%Extreme weather
- 0%Security
The practical consequence: the 5am–8am departure is the one that starts clean. Its aircraft has no earlier leg to be late from, which is exactly why that window shows 86.2% on time here. The split is drawn from 31,102 reported delay minutes.
No single cause dominates. national airspace system at 31%, carrier at 29% and late-arriving aircraft at 28% split the 31,000 reported delay minutes between them. An even spread like this usually means the operation is running close to its designed capacity with no one obvious weak point, and it is the hardest pattern for a traveller to route around.
Cancellations run at 3.80%, against 1.89% nationally. That is about one flight in 25 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
8.7% of arrivals land an hour or more late, close to the national 8.3%, so 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.
The return leg runs 74.2% on time across 1,872 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 1,870 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 ORD after this flight
What to do with this
Booking this route
Put together: the delay figures matter less here than the 3.80% 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. 1,786 completed flights over 12 months sit behind that.
Common questions
GSP to ORD questions
How often is GSP to ORD 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 24.1% of the 1,870 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 GSP to ORD?
Envoy Air leads at 75.4% on time across 862 flights. SkyWest Airlines is at the other end on 71.4%, a gap of 4 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 GSP to ORD?
The 5am–8am departure window is the strongest at 86.2% on time. The 5pm–8pm window is the weakest at 57.9%, 28 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 December delays on GSP to ORD?
December is the weakest month at 61.4% on time, compared with 88.1% in September. Across the year that is 27 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
- ORD to GSP — the return legseparate record
- Chicago O'Hare International (ORD) delay statistics
- Republic Airways on GSP to ORD84.4%
- Envoy Air on GSP to ORD75.4%
- SkyWest Airlines on GSP to ORD71.4%
- GSP to ATL, a related route90.1%
- LGA to ORD, a related route66.7%
- GSP to CLT, a related route82.3%
- United Airlines on-time record100.0%
- PSA Airlines on-time record88.9%
- Republic Airways on-time record84.4%
- The US routes with the most cancellations
- The best time of day to fly, according to 7.05 million flight records
Direction matters. GSP to ORD and ORD to GSP are scored separately because they are separate operations, with different departure banks and different aircraft. Compare the return leg.
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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.