Route reliability record
GSP→BNA
Greer to Nashville
- Flights
- 730
- Period
- September 2025 to August 2026
- Distance
- 265 mi
- Carriers
- 1
This route lands a B+, 6 points better than the national rate of 77.3%. About one flight in six arrives 15 minutes late or worse, and those flights are late by about 45 minutes on average. That rests on 730 GSP to BNA flights, with a median arrival 7 minutes early.
Best time to fly GSP to BNA: a 5am–8am departure, ideally on a Saturday. Flights in that window arrived on time 96.7% of the time and Saturday flights 92.5%, against 83.7% for the route overall.
Set against the rest of the country, this route's record is 6 points better than the US average of 77.3%. That gap is worth roughly 64 fewer late arrivals for every thousand flights.
Key figures
On time
83.7%
Arrivals under 15 minutes late, of 725 completed flights
Avg delay
45 min
Across delayed arrivals only, not all flights
Cancelled
0.41%
National rate is 1.89%
Best carrier
Southwest
83.7% on time across 730 flights
These figures cover 730 flights between September 2025 and August 2026. The median arrival is 7 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.
Fare search by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Carrier by carrier
Which airline is most reliable on GSP to BNA
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 |
|---|---|---|---|---|---|
| Southwest Airlines | 730 | 83.7% | 45 min | 0.41% | B+ |
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
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 37 points, against half a point between the best and worst carrier.
- 5am–8am180 flights96.7%
- 8am–11am161 flights89.9%
- 11am–2pm207 flights86.0%
- 2pm–5pm5 flights—
- 5pm–8pm161 flights59.7%
- 8pm–5am16 flights—
Scale runs 50% to 100%. Rows with fewer than 30 flights show a dash.
The 5pm–8pm window is where this operation falls apart: 59.7% on time, against 96.7% 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 11am–2pm window is the busiest, with 207 flights scheduled in it.
Explore
Filter GSP to BNA 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 BNA, the best departure window is 5am–8am at 96.7% on time and the worst is 5pm–8pm at 59.7%, a wide gap of 37.0 points. All US flights leaving 5am–8am ran 89.3%.
- 5–8am96.7%
- 8–11am89.9%
- 11am–2pm86.0%
- 2–5pm—
- 5–8pm59.7%
- 8pm–5am—
best all US flightsScale 50% to 100%. Cells under 30 flights show a dash.
Across the year
When delays peak on this route
This route's year swings by 30 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.
June is the worst month at 66.7% on time, 30 points below November, the best at 97.0%. 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 93 flights.
Across the week, Saturday is the strongest day at 92.5% on time and Monday the weakest at 76.0%, a spread of 17 points.
Delay causes
Why this route gets delayed
Late-arriving aircraft accounts for 64% of the 5,331 delay minutes carriers reported here, and the remaining four split what is left.
- 64%Late-arriving aircraft
- 18%Carrier
- 13%National Airspace System
- 4%Extreme weather
- 1%Security
64% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 5,331 reported delay minutes here, that single category outweighs weather by 18 to one. The split is drawn from 5,331 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 96.7% on time here.
Cancellations are rare at 0.41%, below the national 1.89% and low enough to earn the plus on the grade. Roughly one flight in 100 is called off; the risk here is arriving late, not not arriving.
Connections and stage length
What a delay here actually costs
Badly late arrivals are rare here: only 3.3% 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 265 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 70.9% on time across 730 flights, 13 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 13 points of difference.
One caution: this is a thin sample. 730 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.
Work out the risk of missing a connection in BNA after this flight
What to do with this
Booking this route
Put together: treat all of this as provisional. 730 flights over twelve months is enough to clear this site's floor and not enough to be confident to better than a couple of points. The 83.7% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 725 completed flights over 12 months sit behind that.
Common questions
GSP to BNA questions
How often is GSP to BNA delayed?
About one flight in six arrives at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 16.3% of the 730 flights in this analysis, against 22.7% nationally. Delayed flights are late by about 45 minutes on average.
How reliable is GSP to BNA compared with the rest of the country?
83.7% of flights arrive on time here against a national 77.3%, a difference of 6 points in its favour. That is worth a B+ on this site's grading scale.
What time of day has the fewest delays on GSP to BNA?
The 5am–8am departure window is the strongest at 96.7% on time. The 5pm–8pm window is the weakest at 59.7%, 37 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 June delays on GSP to BNA?
June is the weakest month at 66.7% on time, compared with 97.0% in November. Across the year that is 30 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
- BNA to GSP — the return legseparate record
- Nashville International (BNA) delay statistics
- GSP to ATL, a related route90.1%
- ORD to BNA, a related route69.2%
- GSP to ORD, a related route75.9%
- Southwest Airlines on-time record83.7%
- Why the first flight of the morning is statistically safest
- The best time of day to fly, according to 7.05 million flight records
Direction matters. GSP to BNA and BNA to GSP are scored separately because they are separate operations, with different departure banks and different aircraft. Compare the return leg.
Embed GSP to BNA’s on-time badge on your site
Paste this into a web page. The badge shows the current on-time rate, cancellation rate and grade, and updates every month. Preview it, or build a badge for another route or airport.
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.