Carrier route record
WNBNA→LAS
Southwest Airlines · Nashville to Las Vegas
- Flights
- 1,783
- 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 BNA to LAS sits in the middle of the pack with a B+. Close to three flights in four arrive on time by the DOT's definition, 2 points worse than the national rate of 77.3%. The late ones land about 50 minutes behind schedule. That rests on 1,783 flights, with a median arrival 3 minutes early.
The US average over the same twelve months is 77.3%, so there is little to separate Southwest on BNA to LAS from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.
Key figures
On time
75.6%
Arrivals under 15 minutes late, of 1,770 completed flights
Avg delay
49 min
Across delayed arrivals only, not all flights
Cancelled
0.62%
National rate is 1.89%
Whole route
75.9%
Every carrier on BNA to LAS, 2,035 flights
These figures cover 1,783 flights between September 2025 and August 2026. The median arrival is 3 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.
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Carrier by carrier
Southwest against every carrier on BNA to LAS
Southwest flew 1,783 of the 2,035 flights on BNA to LAS, most of the route. Its 75.6% on time is about level with the route as a whole at 75.9%. 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+ |
| Allegiant Airthin sample | 2 | 100.0% | — | 0.00% | A+ |
| Spirit Airlinesthin sample | 198 | 79.8% | 94 min | 2.53% | B |
| Southwest Airlines (this page) | 1,783 | 75.6% | 49 min | 0.62% | B+ |
| Frontier Airlinesthin sample | 48 | 66.7% | 160 min | 0.00% | C+ |
| Delta Air Linesthin sample | 2 | 50.0% | 121 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 41 points, against half a point between the best and worst carrier.
- 5am–8am512 flights93.3%
- 8am–11am169 flights87.4%
- 11am–2pm265 flights73.0%
- 2pm–5pm275 flights67.9%
- 5pm–8pm254 flights52.6%
- 8pm–5am308 flights68.1%
Scale runs 45% to 100%.
The 5pm–8pm window is where this operation falls apart: 52.6% on time, against 93.3% 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 5am–8am window is the busiest, with 512 flights scheduled in it.
Across the year
Southwest on BNA to LAS through the year
June is the worst month at 58.4% on time, 28 points below September, the best at 86.0%. 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. October was the busiest month here, with 169 flights.
Across the week, Monday is the strongest day at 79.4% on time and Friday the weakest at 71.3%, a spread of 8 points.
Arrival by arrival
How late Southwest on BNA to LAS runs when it is late
Southwest on BNA to LAS often beats the schedule: 443 of 1,770 completed flights, 25%, arrived 15 minutes or more early. The 431 late arrivals split 176 under half an hour, 140 between 30 and 60 minutes, and 115 an hour or more.
- 15+ min early443 flights25.0%
- Within 15 min896 flights50.6%
- 15–29 min late176 flights9.9%
- 30–59 min late140 flights7.9%
- 1–2 hours late85 flights4.8%
- 2+ hours late30 flights1.7%
Scale runs 0% to 100%.
Share of 1,770 completed flights by arrival against schedule.
A late pushback is often recovered here: of 631 departures that left 15 minutes late or more, 247 still arrived on time. 47 flights left on time and still arrived late.
The worst days
Worst days for Southwest on BNA to LAS
The latest arrival of the period was on 7 June 2026, 4 hours 24 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The same cause led on four of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 7 June 2026 | 4 hours 24 minutes | Late-arriving aircraft |
| 18 June 2026 | 3 hours 35 minutes | Carrier |
| 10 February 2026 | 3 hours 30 minutes | Late-arriving aircraft |
| 17 March 2026 | 3 hours 21 minutes | Late-arriving aircraft |
| 18 May 2026 | 3 hours 19 minutes | Late-arriving aircraft |
Delay causes
Why Southwest runs late on this route
Late-arriving aircraft accounts for 55% of the 21,000 delay minutes carriers reported here, and the remaining four split what is left.
- 55%Late-arriving aircraft
- 29%Carrier
- 14%National Airspace System
- 1%Extreme weather
- 0%Security
55% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 21,000 reported delay minutes here, that single category outweighs weather by 40 to one. The split is drawn from 21,277 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 93.3% on time here.
Cancellations are rare at 0.62%, 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
6.5% of arrivals land an hour or more late, close to the national 8.3%, so a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last about 50 minutes, which a normal layover absorbs.
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 76.6% on time across 1,811 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 1,783 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 BNA to LAS
Put together: the calendar is the biggest lever here, not the carrier or the hour. September runs 86.0% on time and June 58.4%, a swing of 28 points. If the dates move at all, move them out of June before you think about anything else. 1,770 completed flights over 12 months sit behind that.
Related
Where to go next
- BNA to LAS, every carrier
- Southwest on LAS to BNA, the return leg
- Spirit Airlines on BNA to LAS79.8%
- Southwest Airlines network-wide record
- Nashville International (BNA) delay statistics
- Harry Reid International (LAS) 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.