Carrier route record
WNLAS→BNA
Southwest Airlines · Las Vegas to Nashville
- Flights
- 1,811
- Period
- September 2025 to August 2026
- Share of route
- 88%
- Carriers
- 6
Historical statistics for September 2025 to August 2026, not live status. For today’s flights, check with Southwest Airlines.
Southwest on LAS to BNA lands a B+, level with the national rate of 77.3%. About one flight in four arrives 15 minutes late or worse, and those flights are late by roughly 45 minutes on average. That rests on 1,811 flights, with a median arrival 2 minutes early.
The US average over the same twelve months is 77.3%, so there is little to separate Southwest on LAS to BNA from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.
Key figures
On time
76.6%
Arrivals under 15 minutes late, of 1,796 completed flights
Avg delay
44 min
Across delayed arrivals only, not all flights
Cancelled
0.61%
National rate is 1.89%
Whole route
77.3%
Every carrier on LAS to BNA, 2,060 flights
These figures cover 1,811 flights between September 2025 and August 2026. The median arrival is 2 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
Southwest against every carrier on LAS to BNA
Southwest flew 1,811 of the 2,060 flights on LAS to BNA, most of the route. Its 76.6% on time is about level with the route as a whole at 77.3%. Ranked by on-time rate it is number four of six carriers on the route, where the range runs from American at 100.0% to Delta at 50.0%. Five of those carriers flew fewer than 365 flights here, so treat their positions as rough.
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 |
|---|---|---|---|---|---|
| American Airlinesthin sample | 2 | 100.0% | — | 0.00% | A+ |
| Spirit Airlinesthin sample | 195 | 84.1% | 86 min | 3.08% | B− |
| Frontier Airlinesthin sample | 48 | 78.7% | 76 min | 0.00% | B+ |
| Southwest Airlines (this page) | 1,811 | 76.6% | 44 min | 0.61% | B+ |
| Allegiant Airthin sample | 2 | 50.0% | 60 min | 0.00% | F+ |
| Delta Air Linesthin sample | 2 | 50.0% | 95 min | 0.00% | F+ |
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
When Southwest runs best on this route
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 47 points, against half a point between the best and worst carrier.
- 5am–8am404 flights95.0%
- 8am–11am297 flights82.0%
- 11am–2pm296 flights63.1%
- 2pm–5pm190 flights48.4%
- 5pm–8pm241 flights65.3%
- 8pm–5am383 flights84.4%
Scale runs 40% to 100%.
Book the early departure. Flights leaving between 5am–8am arrive on time 95.0% of the time, against 48.4% for the afternoon window. That is 47 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 404 flights scheduled in it.
Across the year
Southwest on LAS to BNA through the year
June is the worst month at 65.9% on time, 22 points below December, the best at 87.8%. 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. June was the busiest month here, with 173 flights.
Across the week, Saturday is the strongest day at 83.4% on time and Friday the weakest at 67.6%, a spread of 16 points.
Arrival by arrival
How late Southwest on LAS to BNA runs when it is late
The 421 late arrivals split 196 under half an hour, 142 between 30 and 60 minutes, and 83 an hour or more.
- 15+ min early310 flights17.3%
- Within 15 min1,065 flights59.3%
- 15–29 min late196 flights10.9%
- 30–59 min late142 flights7.9%
- 1–2 hours late65 flights3.6%
- 2+ hours late18 flights1.0%
Scale runs 0% to 100%.
Share of 1,796 completed flights by arrival against schedule.
A late pushback is often recovered here: of 504 departures that left 15 minutes late or more, 158 still arrived on time. 75 flights left on time and still arrived late.
The worst days
Worst days for Southwest on LAS to BNA
The latest arrival of the period was on 26 September 2025, 4 hours 27 minutes behind schedule; most of its delay minutes were filed as extreme weather. On three of the five worst days the largest share was filed as carrier-caused (crew, maintenance, fuelling, baggage).
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 26 September 2025 | 4 hours 27 minutes | Extreme weather |
| 14 August 2026 | 3 hours 55 minutes | Carrier |
| 14 December 2025 | 3 hours 23 minutes | Carrier |
| 28 July 2026 | 3 hours 19 minutes | None reported |
| 9 April 2026 | 3 hours 14 minutes | Carrier |
Delay causes
Why Southwest runs late on this route
Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 18,000 reported delay minutes.
- 40%Late-arriving aircraft
- 39%Carrier
- 19%National Airspace System
- 3%Extreme weather
- 0%Security
40% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 18,000 reported delay minutes here, that single category outweighs weather by 14 to one. The split is drawn from 18,288 reported delay minutes.
The largest share of delay minutes, 39%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 7,107 of the 18,000 delay minutes reported here.
Cancellations are rare at 0.61%, 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 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 1,587 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 runs 75.6% on time across 1,783 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 1,811 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 Southwest on LAS to BNA
Put together: the calendar is the biggest lever here, not the carrier or the hour. December runs 87.8% on time and June 65.9%, a swing of 22 points. If the dates move at all, move them out of June before you think about anything else. 1,796 completed flights over 12 months sit behind that.
Related
Where to go next
- LAS to BNA, every carrier
- Southwest on BNA to LAS, the return leg
- Spirit Airlines on LAS to BNA84.1%
- Southwest Airlines network-wide record
- Harry Reid International (LAS) delay statistics
- Nashville International (BNA) delay statistics
- Why the first flight of the morning is statistically safest
- The best time of day to fly, according to 7.05 million flight records
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.