Route reliability record
BNA→GSP
Nashville to Greer
- Flights
- 730
- Period
- September 2025 to August 2026
- Distance
- 265 mi
- Carriers
- 1
This route sits in the middle of the pack with a C+. About seven flights in ten arrive on time by the DOT's definition, 6 points worse than the national rate of 77.3%. The late ones land about an hour behind schedule. That rests on 730 BNA to GSP flights, with a median arrival 1 minute early.
Best time to fly BNA to GSP: a 8am–11am departure, ideally on a Saturday. Flights in that window arrived on time 91.0% of the time and Saturday flights 82.9%, against 70.9% for the route overall.
The national on-time rate over the same period is 77.3%, so this route runs 6 points behind the country as a whole. Across a thousand flights that is about 64 extra late arrivals.
Key figures
On time
70.9%
Arrivals under 15 minutes late, of 724 completed flights
Avg delay
58 min
Across delayed arrivals only, not all flights
Cancelled
0.68%
National rate is 1.89%
Best carrier
Southwest
70.9% on time across 730 flights
These figures cover 730 flights between September 2025 and August 2026. Beyond the headline rate, 9.0% 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 BNA to GSP
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 | 70.9% | 58 min | 0.68% | C+ |
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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 46 points, against half a point between the best and worst carrier.
- 5am–8am—
- 8am–11am201 flights91.0%
- 11am–2pm16 flights—
- 2pm–5pm264 flights71.2%
- 5pm–8pm121 flights63.3%
- 8pm–5am128 flights45.2%
Scale runs 35% to 95%. Rows with fewer than 30 flights show a dash.
The 8pm–5am window is where this operation falls apart: 45.2% on time, against 91.0% for the 8am–11am 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 264 flights scheduled in it.
Explore
Filter BNA 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 BNA to GSP, the best departure window is 8am–11am at 91.0% on time and the worst is 8pm–5am at 45.2%, a wide gap of 45.8 points. All US flights leaving 8am–11am ran 83.9%.
- 5–8am—
- 8–11am91.0%
- 11am–2pm—
- 2–5pm71.2%
- 5–8pm63.3%
- 8pm–5am45.2%
best all US flightsScale 35% to 95%. Cells under 30 flights show a dash.
Across the year
When delays peak on this route
This route's year swings by 38 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 55.4% on time, 38 points below September, the best at 93.3%. 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 82.9% on time and Friday the weakest at 62.1%, a spread of 21 points.
Delay causes
Why this route gets delayed
Late-arriving aircraft accounts for 73% of the 12,000 delay minutes carriers reported here, and the remaining four split what is left.
- 73%Late-arriving aircraft
- 22%Carrier
- 3%National Airspace System
- 3%Extreme weather
73% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 12,000 reported delay minutes here, that single category outweighs weather by 29 to one. The split is drawn from 12,086 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 91.0% on time here.
Cancellations are rare at 0.68%, 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
9.0% 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.
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 8am–11am 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 730 flights, 13 points above 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 GSP 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 70.9% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 724 completed flights over 12 months sit behind that.
Common questions
BNA to GSP questions
How often is BNA to GSP delayed?
Roughly one flight in three arrives at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 29.1% of the 730 flights in this analysis, against 22.7% nationally. Delayed flights are late by about an hour on average.
How reliable is BNA to GSP compared with the rest of the country?
70.9% of flights arrive on time here against a national 77.3%, a difference of 6 points against it. That is worth a C+ on this site's grading scale.
What time of day has the fewest delays on BNA to GSP?
The 8am–11am departure window is the strongest at 91.0% on time. The 8pm–5am window is the weakest at 45.2%, 46 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 BNA to GSP?
July is the weakest month at 55.4% on time, compared with 93.3% in September. Across the year that is 38 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 BNA — the return legseparate record
- Nashville International (BNA) delay statistics
- BNA to ORD, a related route70.9%
- ATL to GSP, a related route83.7%
- BNA to DCA, a related route71.3%
- Southwest Airlines on-time record70.9%
- 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. BNA to GSP and GSP to BNA 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.