Route reliability record
GSP→ATL
Greer to Atlanta
- Flights
- 2,798
- Period
- September 2025 to August 2026
- Distance
- 153 mi
- Carriers
- 1
This route earns an A. Close to nine flights in ten arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 13 points better than the national rate of 77.3%. When something does go wrong the average delay runs an hour and a half. That rests on 2,798 GSP to ATL flights, with a median arrival 15 minutes early.
Best time to fly GSP to ATL: a 5am–8am departure, ideally on a Thursday. Flights in that window arrived on time 95.5% of the time and Thursday flights 93.8%, against 90.1% for the route overall.
Set against the rest of the country, this route's record is 13 points better than the US average of 77.3%. That gap is worth roughly 128 fewer late arrivals for every thousand flights.
Key figures
On time
90.1%
Arrivals under 15 minutes late, of 2,751 completed flights
Avg delay
86 min
Across delayed arrivals only, not all flights
Cancelled
1.61%
National rate is 1.89%
Best carrier
Delta
90.1% on time across 2,798 flights
These figures cover 2,798 flights between September 2025 and August 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.
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Carrier by carrier
Which airline is most reliable on GSP to ATL
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 |
|---|---|---|---|---|---|
| Delta Air Lines | 2,798 | 90.1% | 86 min | 1.61% | A |
Flight by flight
Flights on GSP to ATL
The flight numbers below flew this route at least 250 times in the period, busiest first. Each has its own record, with its schedule and delay causes.
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Best ways to make this trip
The most reliable ways to fly Greer to Atlanta
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. 1 of the top 2 use a different airport at one end.
| Option | Airline | Success | On time | Cancelled | Best departure | Most punctual flight |
|---|---|---|---|---|---|---|
| 1. GSP → ATLGreer to Atlanta | Delta Air Lines | 88.6% | 90.1% | 1.61% | 5am–8am, Thu | DL 3028 05:40 |
| 2. AVL → ATLAsheville to Atlanta | Delta Air Lines | 85.1% | 86.3% | 1.35% | 11am–2pm, Wed | — |
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 13 points, against half a point between the best and worst carrier.
- 5am–8am773 flights95.5%
- 8am–11am650 flights92.8%
- 11am–2pm487 flights89.6%
- 2pm–5pm378 flights85.4%
- 5pm–8pm438 flights82.3%
- 8pm–5am72 flights84.5%
Scale runs 75% to 100%.
Book the early departure. Flights leaving between 5am–8am arrive on time 95.5% of the time, against 82.3% for the evening window. That is 13 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 5am–8am window is the busiest, with 773 flights scheduled in it.
Explore
Filter GSP to ATL 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 ATL, the best departure window is 5am–8am at 95.5% on time and the worst is 5pm–8pm at 82.3%, a wide gap of 13.2 points. All US flights leaving 5am–8am ran 89.3%.
- 5–8am95.5%
- 8–11am92.8%
- 11am–2pm89.6%
- 2–5pm85.4%
- 5–8pm82.3%
- 8pm–5am84.5%
best all US flightsScale 60% to 100%.
Across the year
When delays peak on this route
This route's year swings by 13 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.
July is the worst month at 82.7% on time, 13 points below April, the best at 95.4%. Summer afternoon convection and peak-season schedules land on the same weeks every year, so this is a pattern you can book around rather than a run of bad luck. May was the busiest month here, with 254 flights.
Across the week, Thursday is the strongest day at 93.8% on time and Sunday the weakest at 85.6%, a spread of 8 points.
Delay causes
Why this route gets delayed
Late-arriving aircraft accounts for 43% of the 23,000 delay minutes carriers reported here, and the remaining four split what is left.
- 43%Late-arriving aircraft
- 31%Carrier
- 21%National Airspace System
- 5%Extreme weather
43% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 23,000 reported delay minutes here, that single category outweighs weather by 10 to one. The split is drawn from 23,324 reported delay minutes.
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 95.5% on time here.
Cancellations sit at 1.61% against a national 1.89%, which is ordinary. Diversions add another 0.07%.
Connections and stage length
What a delay here actually costs
Badly late arrivals are rare here: only 4.6% land an hour or more behind schedule, against 8.3% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.
At 153 miles this is a short hop, and stage length matters more than it looks. A flight this short spends under two hours in the air, which leaves almost nothing to claw back a late pushback with. Delay here is decided on the ground, in the turn, which is why the 5am–8am window matters as much as it does.
The return leg is a different operation and performs like one: it runs 83.7% on time across 2,797 flights, 6 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 6 points of difference.
The sample behind these figures is 2,798 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 ATL after this flight
What to do with this
Booking this route
Put together: the calendar is the biggest lever here, not the carrier or the hour. April runs 95.4% on time and July 82.7%, a swing of 13 points. If the dates move at all, move them out of July before you think about anything else. 2,751 completed flights over 12 months sit behind that.
Common questions
GSP to ATL questions
How often is GSP to ATL delayed?
About one flight in ten arrives at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 9.9% of the 2,798 flights in this analysis, against 22.7% nationally. Delayed flights are late by an hour and a half on average.
How reliable is GSP to ATL compared with the rest of the country?
90.1% of flights arrive on time here against a national 77.3%, a difference of 13 points in its favour. That is worth a A on this site's grading scale.
What time of day has the fewest delays on GSP to ATL?
The 5am–8am departure window is the strongest at 95.5% on time. The 5pm–8pm window is the weakest at 82.3%, 13 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 July delays on GSP to ATL?
July is the weakest month at 82.7% on time, compared with 95.4% in April. Across the year that is 13 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
- ATL to GSP — the return legseparate record
- Hartsfield-Jackson Atlanta International (ATL) delay statistics
- GSP to ORD, a related route75.9%
- LGA to ATL, a related route75.5%
- GSP to CLT, a related route82.3%
- Delta Air Lines on-time record90.1%
- Why the first flight of the morning is statistically safest
- The most punctual routes in the US, and the least
Direction matters. GSP to ATL and ATL 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.