Route reliability record

BNA→LAX

Nashville to Los Angeles

Flights: 2,317
Period: July 2025 to June 2026
Distance: 1,798 mi
Carriers: 4

This route lands a B+, level with the national rate of 77.6%. Roughly one flight in four arrive 15 minutes late or worse, and those flights are late by about an hour on average. That is a workable record, not a spotless one. That rests on 2,317 flights, of which Delta Air Lines flew 909 at 85.5% on time.

Delta Air Lines is the most reliable of the three carriers covered here at 85.5% on time across 909 flights.

On time

77.0%

Arrivals under 15 minutes late, of 2,293 completed flights

Avg delay

61 min

Across delayed arrivals only, not all flights

Cancelled

0.95%

National rate is 1.81%

Best carrier

Delta

85.5% on time across 909 flights

These figures cover 2,317 flights between July 2025 and June 2026. The median arrival is 4 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 BNA to LAX

The choice of carrier is not cosmetic here. Delta Air Lines arrives on time 85.5% of the time; Southwest Airlines manages 70.7%. Sample sizes sit next to every figure, because a two-point gap across 927 flights means less than a ten-point one.

On-time performance by carrier on BNA to LAX
Airline	Flights	On time	Avg delay	Cancelled	Grade
Delta Air Lines	909	85.5%	61 min	1.32%	A
Spirit Airlinesthin sample	68	80.6%	124 min	1.47%	B
American Airlines	413	72.0%	95 min	0.73%	C+
Southwest Airlines	927	70.7%	43 min	0.65%	C+

The spread between Delta and Southwest is 15 points, wide enough that it should decide the booking. On a hundred trips that is 15 more arrivals inside the on-time window.

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 24 points, against 15 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.

5am–8am574 flights91.2%
8am–11am172 flights87.6%
11am–2pm31 flights74.2%
2pm–5pm591 flights74.5%
5pm–8pm506 flights67.5%
8pm–5am443 flights68.9%

Scale runs 60% to 95%. Rows with fewer than 30 flights show a dash.

Book the early departure. Flights leaving between 5am–8am arrive on time 91.2% of the time, against 67.5% for the evening window. That is 24 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 2pm–5pm window is the busiest, with 591 flights scheduled in it.

Across the year

When delays peak on this route

This route's year swings by 28 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.

Darker means more delays. Figures are on-time percentages.March best, April worst

Delays peak in April, when the on-time rate falls to 62.8%. March is the strongest month at 90.8%. Moving a flexible trip across that boundary buys 28 points. June was the busiest month here, with 232 flights.

Across the week, Friday is the strongest day at 80.4% on time and Sunday the weakest at 68.5%. 12 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. Late-arriving aircraft accounts for 48% of the 32,000 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.

Late-arriving aircraft
48%
Carrier
35%
National Airspace System
15%
Extreme weather
1%
Security
0%

48% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 32,000 reported delay minutes here, that single category outweighs weather by 34 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 32,099 reported delay minutes.

The largest share of delay minutes, 35%, 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 11,000 of the 32,000 delay minutes reported here.

Cancellations sit at 0.95% against a national 1.81%, which is ordinary. Diversions add another 0.09%.

Connections and stage length

What a delay here actually costs

6.1% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route are the about an hour kind, which a normal layover absorbs.

At 1,798 miles this is transcontinental flying, and long routes get a quiet structural advantage. Scheduled block time on a flight this length carries more padding in absolute minutes, so a twenty-minute late departure often still becomes an on-time arrival. Read the on-time rate here as slightly flattering next to a short-haul route with the same operational quality.

The return leg is a different operation and performs like one: it runs 81.6% on time across 2,320 flights, 5 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 5 points of difference.

The sample behind these figures is 2,317 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.

What to do with this

Booking this route

Put together: the calendar is the biggest lever here, not the carrier or the hour. March runs 90.8% on time and April 62.8%, a swing of 28 points. If the dates move at all, move them out of April before you think about anything else. 2,293 completed flights over 12 months sit behind that.

Common questions

BNA to LAX questions

How often is BNA to LAX delayed?

Roughly one flight in four arrive at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 23.0% of the 2,317 flights in this analysis, against 22.4% nationally. Delayed flights are late by about an hour on average.

Which airline is most reliable on BNA to LAX?

Delta Air Lines leads at 85.5% on time across 909 flights. Southwest Airlines is at the other end on 70.7%, a gap of 15 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 BNA to LAX?

The 5am–8am departure window is the strongest at 91.2% on time. The 5pm–8pm window is the weakest at 67.5%, 24 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 April delays on BNA to LAX?

April is the weakest month at 62.8% on time, compared with 90.8% in March. Across the year that is 28 points between the best and worst months. Moving flexible dates out of that month is one of the few things that reliably helps.

Where to go next

Direction matters. BNA to LAX and LAX to BNA are scored separately because they are separate operations, with different departure banks and different aircraft. Compare the return leg.

Source: US DOT Bureau of Transportation Statistics, on-time performance data, July 2025 to June 2026. Updated monthly. How this data is collected.

Key figures