Carrier route record
WNCLE→LAS
Southwest Airlines · Cleveland to Las Vegas
- Flights
- 364
- Period
- September 2025 to August 2026
- Share of route
- 36%
- Carriers
- 4
Historical statistics for September 2025 to August 2026, not live status. For today’s flights, check with Southwest Airlines.
Southwest on CLE to LAS lands a B+, 2 points better than the national rate of 77.3%. About one flight in five arrives 15 minutes late or worse, and those flights are late by roughly 50 minutes on average. That rests on 364 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 CLE 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
79.4%
Arrivals under 15 minutes late, of 360 completed flights
Avg delay
52 min
Across delayed arrivals only, not all flights
Cancelled
0.55%
National rate is 1.89%
Whole route
75.7%
Every carrier on CLE to LAS, 1,001 flights
These figures cover 364 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 CLE to LAS
Southwest flew 364 of the 1,001 flights on CLE to LAS, about 36% of it. Its 79.4% on time is 4 points better than the route as a whole, which runs 75.7%. Ranked by on-time rate it is number three of four carriers on the route, where the range runs from Delta at 100.0% to Frontier at 73.5%. Two 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 |
|---|---|---|---|---|---|
| Delta Air Linesthin sample | 1 | 100.0% | — | 0.00% | A+ |
| American Airlinesthin sample | 2 | 100.0% | — | 0.00% | A+ |
| Southwest Airlines (this page)thin sample | 364 | 79.4% | 52 min | 0.55% | B+ |
| Frontier Airlines | 634 | 73.5% | 89 min | 2.52% | C |
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 25 points, against half a point between the best and worst carrier.
- 5am–8am33 flights100.0%
- 8am–11am4 flights—
- 11am–2pm150 flights79.7%
- 2pm–5pm156 flights75.5%
- 5pm–8pm—
- 8pm–5am21 flights—
Scale runs 65% to 100%. Rows with fewer than 30 flights show a dash.
Book the early departure. Flights leaving between 5am–8am arrive on time 100.0% of the time, against 75.5% for the afternoon window. That is 25 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 156 flights scheduled in it.
Across the year
Southwest on CLE to LAS through the year
December is the weak month at 60.0% on time, against 90.0% in November. Winter delays cluster: a single storm system can account for most of a month's shortfall, so an average December hides both very good weeks and genuinely unflyable days. January was the busiest month here, with 31 flights.
Across the week, Wednesday is the strongest day at 90.4% on time and Monday the weakest at 69.8%, a spread of 21 points.
Arrival by arrival
How late Southwest on CLE to LAS runs when it is late
The 74 late arrivals split 33 under half an hour, 26 between 30 and 60 minutes, and 15 an hour or more.
- 15+ min early78 flights21.7%
- Within 15 min208 flights57.8%
- 15–29 min late33 flights9.2%
- 30–59 min late26 flights7.2%
- 1–2 hours late7 flights1.9%
- 2+ hours late8 flights2.2%
Scale runs 0% to 100%.
Share of 360 completed flights by arrival against schedule.
A late pushback is often recovered here: of 94 departures that left 15 minutes late or more, 38 still arrived on time. In the other direction, 18 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at LAS.
The worst days
Worst days for Southwest on CLE to LAS
The latest arrival of the period was on 18 May 2026, 8 hours 7 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The same cause led on five of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 18 May 2026 | 8 hours 7 minutes | Late-arriving aircraft |
| 14 December 2025 | 3 hours 28 minutes | Late-arriving aircraft |
| 26 November 2025 | 3 hours 11 minutes | Late-arriving aircraft |
| 2 December 2025 | 2 hours 15 minutes | Late-arriving aircraft |
| 26 April 2026 | 2 hours 9 minutes | Late-arriving aircraft |
Delay causes
Why Southwest runs late on this route
Late-arriving aircraft accounts for 66% of the 3,859 delay minutes carriers reported here, and the remaining four split what is left.
- 66%Late-arriving aircraft
- 20%National Airspace System
- 14%Carrier
- 0%Security
66% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 3,859 reported delay minutes here, that single category outweighs weather by 66 to one. The split is drawn from 3,859 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 100.0% on time here.
Cancellations are rare at 0.55%, 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 4.2% 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 1,824 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 73.1% on time across 364 flights, 6 points below 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 6 points of difference.
One caution: this is a thin sample. 364 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.
What to do with this
Booking Southwest on CLE to LAS
Put together: treat all of this as provisional. 364 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 79.4% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 360 completed flights over 12 months sit behind that.
Related
Where to go next
- CLE to LAS, every carrier
- Southwest on LAS to CLE, the return leg
- Frontier Airlines on CLE to LAS73.5%
- Southwest Airlines network-wide record
- Cleveland Hopkins International (CLE) 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.