Carrier route record

WNLAS→CLE

Southwest Airlines · Las Vegas to Cleveland

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 LAS to CLE sits in the middle of the pack with a C+. Close to three flights in four arrive on time by the DOT's definition, 4 points worse than the national rate of 77.3%. The late ones land about 35 minutes behind schedule. That rests on 364 flights, with a median arrival 2 minutes late.

The national on-time rate over the same period is 77.3%, so Southwest on LAS to CLE runs 4 points behind the country as a whole. Across a thousand flights that is about 42 extra late arrivals.

On time

73.1%

Arrivals under 15 minutes late, of 364 completed flights

Avg delay

35 min

Across delayed arrivals only, not all flights

Cancelled

0.00%

National rate is 1.89%

Whole route

73.1%

Every carrier on LAS to CLE, 1,003 flights

These figures cover 364 flights between September 2025 and August 2026. On-time means an arrival less than 15 minutes after the scheduled gate time, the same threshold the Department of Transportation uses in its own reports. Cancelled and diverted flights are excluded from the on-time rate and counted separately, which is why the cancellation column matters on its own.

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Carrier by carrier

Southwest against every carrier on LAS to CLE

Southwest flew 364 of the 1,003 flights on LAS to CLE, about 36% of it. Its 73.1% on time is about level with the route as a whole at 73.1%. 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 72.9%. 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.

On-time performance by carrier on LAS to CLE
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	73.1%	35 min	0.00%	C+
Frontier Airlines	636	72.9%	80 min	2.83%	C

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Departure window

When Southwest runs best on this route

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 364 flights.

5am–8am26 flights—
8am–11am87 flights75.9%
11am–2pm238 flights70.2%
2pm–5pm13 flights—
5pm–8pm—
8pm–5am—

Scale runs 60% to 80%. Rows with fewer than 30 flights show a dash.

The weak window here is the middle of the day, not the evening: 11am–2pm runs 70.2% on time against 75.9% for 8am–11am. That shape usually means a departure bank rather than an accumulating delay, so the recovery later in the afternoon is real rather than noise. The 11am–2pm window is the busiest, with 238 flights scheduled in it.

Across the year

Southwest on LAS to CLE through the year

Darker means more delays. Figures are on-time percentages.August best, July worst

July is the worst month at 43.3% on time, 47 points below August, the best at 90.3%. 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. January was the busiest month here, with 31 flights.

Across the week, Tuesday is the strongest day at 84.6% on time and Friday the weakest at 53.8%, a spread of 31 points.

Arrival by arrival

How late Southwest on LAS to CLE runs when it is late

Most of the lateness is short. 56 of the 98 late arrivals were under half an hour behind, and 12 reached an hour or more.

15+ min early53 flights14.6%
Within 15 min213 flights58.5%
15–29 min late56 flights15.4%
30–59 min late30 flights8.2%
1–2 hours late10 flights2.7%
2+ hours late2 flights0.5%

Scale runs 0% to 100%.

Share of 364 completed flights by arrival against schedule.

A late pushback is often recovered here: of 110 departures that left 15 minutes late or more, 35 still arrived on time. In the other direction, 23 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 CLE.

The worst days

Worst days for Southwest on LAS to CLE

The latest arrival of the period was on 19 December 2025, 3 hours 24 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. On three of the five worst days the largest share was filed as carrier-caused (crew, maintenance, fuelling, baggage).

The latest arrivals of Southwest on LAS to CLE in the period
Date	Arrived late by	Largest filed cause
19 December 2025	3 hours 24 minutes	Late-arriving aircraft
5 January 2026	2 hours 29 minutes	Carrier
8 July 2026	1 hour 59 minutes	Carrier
18 May 2026	1 hour 45 minutes	Late-arriving aircraft
29 May 2026	1 hour 23 minutes	Carrier

Delay causes

Why Southwest runs late on this route

Carrier accounts for 45% of the 3,466 delay minutes carriers reported here, and the remaining four split what is left.

Carrier
45%
Late-arriving aircraft
36%
National Airspace System
19%
Extreme weather
1%

36% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 3,466 reported delay minutes here, that single category outweighs weather by 34 to one. The split is drawn from 3,466 reported delay minutes.

The largest share of delay minutes, 45%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 1,544 of the 3,466 delay minutes reported here.

Cancellations are rare at 0.00%, below the national 1.89% and low enough to earn the plus on the grade. Almost no flights are 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 3.3% 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 79.4% on time across 364 flights, 6 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 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 LAS to CLE

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 73.1% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 364 completed flights over 12 months sit behind that.

Where to go next

Source: US DOT Bureau of Transportation Statistics, on-time performance data, September 2025 to August 2026. Last updated 22 October 2026; recomputed monthly. How this data is collected.

Key figures