Route reliability record
SLC→BNA
Salt Lake City to Nashville
- Flights
- 1,205
- Period
- July 2025 to June 2026
- Distance
- 1,404 mi
- Carriers
- 2
This route earns an A+. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 8 points better than the national rate of 77.6%. When something does go wrong the average delay runs about 50 minutes. That rests on 1,205 SLC to BNA flights, with a median arrival 7 minutes early.
Best time to fly SLC to BNA: a 8am–11am departure, ideally on a Saturday. Flights in that window arrived on time 89.4% of the time and Saturday flights 88.3%, against 85.8% for the route overall.
Set against the rest of the country, this route's record is 8 points better than the US average of 77.6%. That gap is worth roughly 82 fewer late arrivals for every thousand flights.
Key figures
On time
85.8%
Arrivals under 15 minutes late, of 1,194 completed flights
Avg delay
51 min
Across delayed arrivals only, not all flights
Cancelled
0.58%
National rate is 1.81%
Best carrier
Delta
85.4% on time across 933 flights
These figures cover 1,205 flights between July 2025 and June 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.
Carrier by carrier
Which airline is most reliable on SLC 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 Airlinesthin sample | 272 | 87.4% | 47 min | 0.74% | A+ |
| Delta Air Lines | 933 | 85.4% | 52 min | 0.54% | A+ |
Flight by flight
Flights on SLC to BNA
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.
Departure window
The best time of day to leave
Departure time is the single lever a traveller controls, and it moves the odds more than most people expect. Each bar below is the on-time rate for flights scheduled to leave inside that window, across 1,205 flights.
- 5am–8am13 flights—
- 8am–11am431 flights89.4%
- 11am–2pm278 flights87.4%
- 2pm–5pm120 flights84.0%
- 5pm–8pm363 flights80.6%
- 8pm–5am—
Scale runs 70% to 95%. Rows with fewer than 30 flights show a dash.
Book the morning departure. Flights leaving between 8am–11am arrive on time 89.4% of the time, against 80.6% for the evening window. That is 9 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 8am–11am window is the busiest, with 431 flights scheduled in it.
Across the year
When delays peak on this route
This route's year swings by 18 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 74.3% on time, 18 points below November, the best at 92.0%. 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. July was the busiest month here, with 116 flights.
Across the week, Saturday is the strongest day at 88.3% on time and Sunday the weakest at 82.7%. 6 points is a smaller lever than departure hour, but it is free.
Delay causes
Why this route gets delayed
One category carries most of the weight here. Carrier accounts for 52% of the 8,611 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.
- 52%Carrier
- 23%Late-arriving aircraft
- 22%National Airspace System
- 2%Extreme weather
The largest share of delay minutes, 52%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 4,485 of the 8,611 delay minutes reported here. The split is drawn from 8,611 reported delay minutes.
Cancellations are rare at 0.58%, below the national 1.81% 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 3.4% land an hour or more behind schedule, against 8.1% 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.
The 1,404 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. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.
The return leg runs 84.4% on time across 1,205 flights, within about a point 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 1,205 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 BNA 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. November runs 92.0% on time and July 74.3%, a swing of 18 points. If the dates move at all, move them out of July before you think about anything else. 1,194 completed flights over 12 months sit behind that.
Common questions
SLC to BNA questions
How often is SLC to BNA delayed?
About one flight in seven arrives at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 14.2% of the 1,205 flights in this analysis, against 22.4% nationally. Delayed flights are late by about 50 minutes on average.
How reliable is SLC to BNA compared with the rest of the country?
85.8% of flights arrive on time here against a national 77.6%, a difference of 8 points in its favour. That is worth a A+ on this site's grading scale.
What time of day has the fewest delays on SLC to BNA?
The 8am–11am departure window is the strongest at 89.4% on time. The 5pm–8pm window is the weakest at 80.6%, 9 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 SLC to BNA?
July is the weakest month at 74.3% on time, compared with 92.0% in November. Across the year that is 18 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 SLC — the return legseparate record
- Salt Lake City International (SLC) delay statistics
- Nashville International (BNA) delay statistics
- Southwest Airlines on SLC to BNA87.4%
- Delta Air Lines on SLC to BNA85.4%
- SLC to DEN, a related route77.8%
- ORD to BNA, a related route68.6%
- SLC to PHX, a related route83.9%
- Southwest Airlines on-time record87.4%
- Delta Air Lines on-time record85.4%
- The best time of day to fly, according to 7.04 million flight records
- Worst months to fly in the US, ranked by the data
Direction matters. SLC to BNA and BNA to SLC 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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.