Carrier performance at one airport
WN→LAS
Southwest Airlines at Harry Reid International
- Departures
- 86,407
- Period
- September 2025 to August 2026
- Routes
- 25
- Rank here
- #10 of 11
Southwest Airlines at Las Vegas 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 50 minutes behind schedule. That rests on 86,407 flights, of which Spirit Airlines flew 5,509 at 85.0% on time.
Measured against the airport rather than the country, Southwest Airlines runs 3 points behind the 76.9% weighted average across all carriers at LAS. That is the comparison worth making: every operator here works the same runways, the same airspace and the same weather.
Key figures
On time
73.4%
85,710 completed departures
Avg delay
50 min
Across delayed flights only
Cancelled
0.60%
At LAS, this carrier only
Rank here
#10
Of 11 carriers clearing the floor at LAS
These figures cover 86,000 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.
Against the competition
Every carrier at LAS, ranked
The choice of carrier is not cosmetic here. Spirit Airlines arrives on time 85.0% of the time; Hawaiian Airlines manages 70.6%. Sample sizes sit next to every figure, because a two-point gap across 594 flights means less than a ten-point one.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Spirit Airlines | 5,509 | 85.0% | 87 min | 1.89% | A |
| Delta Air Lines | 15,583 | 84.4% | 79 min | 1.08% | B |
| Allegiant Air | 7,022 | 83.1% | 75 min | 0.43% | B+ |
| American Airlines | 14,079 | 80.5% | 98 min | 1.68% | B |
| SkyWest Airlines | 3,247 | 79.5% | 66 min | 0.95% | B+ |
| United Airlines | 15,169 | 79.5% | 71 min | 0.63% | B+ |
| Alaska Airlines | 7,098 | 78.7% | 60 min | 1.01% | B |
| JetBlue Airways | 4,040 | 77.5% | 83 min | 2.40% | B |
| Frontier Airlines | 13,095 | 75.4% | 79 min | 1.46% | B |
| Southwest Airlines (this page) | 86,407 | 73.4% | 50 min | 0.60% | C+ |
| Hawaiian Airlines | 594 | 70.6% | 101 min | 0.34% | C+ |
The spread between Spirit and Hawaiian is 14 points, wide enough that it should decide the booking. On a hundred trips that is 14 more arrivals inside the on-time window.
Route by route
Where Southwest Airlines flies from LAS
Southwest Airlines operates 25 routes out of LAS with enough volume to report. Route records inside one carrier at one airport still spread widely, because a short shuttle and a transcontinental have very different exposure to a late inbound.
| Route | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| LAS to SAN · San Diego | 3,757 | 58.7% | 50 min | 0.93% | D+ |
| LAS to SMF · Sacramento | 3,460 | 76.8% | 52 min | 0.38% | B+ |
| LAS to PHX · Phoenix | 3,457 | 76.0% | 53 min | 1.10% | B |
| LAS to RNO · Reno | 3,376 | 78.3% | 52 min | 0.68% | B+ |
| LAS to SJC · San Jose | 3,275 | 77.8% | 49 min | 0.34% | B+ |
| LAS to BUR · Burbank | 3,201 | 76.9% | 53 min | 1.09% | B |
| LAS to OAK · Oakland | 3,168 | 71.6% | 51 min | 0.38% | C+ |
| LAS to DEN · Denver | 3,122 | 70.9% | 55 min | 0.93% | C+ |
| LAS to DAL · Dallas | 2,857 | 71.0% | 50 min | 1.51% | C |
| LAS to SNA · Santa Ana | 2,518 | 77.7% | 48 min | 0.56% | B+ |
| LAS to LAX · Los Angeles | 2,355 | 67.6% | 48 min | 0.51% | C+ |
| LAS to MDW · Chicago | 2,272 | 74.7% | 46 min | 0.62% | C+ |
| LAS to AUS · Austin | 2,187 | 72.3% | 49 min | 0.37% | C+ |
| LAS to LGB · Long Beach | 2,087 | 76.2% | 45 min | 0.38% | B+ |
| LAS to HOU · Houston | 2,020 | 72.7% | 48 min | 0.40% | C+ |
| LAS to BNA · Nashville | 1,811 | 76.6% | 44 min | 0.61% | B+ |
| LAS to STL · St. Louis | 1,784 | 77.3% | 55 min | 0.17% | B+ |
| LAS to MCI · Kansas City | 1,760 | 73.5% | 49 min | 0.28% | C+ |
| LAS to ONT · Ontario | 1,749 | 73.1% | 50 min | 0.63% | C+ |
| LAS to ABQ · Albuquerque | 1,703 | 75.5% | 52 min | 0.53% | B+ |
| LAS to BWI · Baltimore | 1,630 | 78.6% | 45 min | 1.10% | B |
| LAS to SAT · San Antonio | 1,569 | 72.1% | 49 min | 0.25% | C+ |
| LAS to SLC · Salt Lake City | 1,446 | 75.2% | 48 min | 0.55% | B+ |
| LAS to SFO · San Francisco | 1,312 | 42.4% | 55 min | 0.76% | F+ |
| LAS to TUS · Tucson | 1,241 | 75.1% | 50 min | 0.48% | B+ |
Departure window
Best time of day for this operation
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 29 points, against 14 points between the best and worst carrier.
- 5am–8am11,720 flights91.7%
- 8am–11am19,557 flights84.0%
- 11am–2pm13,934 flights72.4%
- 2pm–5pm14,563 flights63.3%
- 5pm–8pm14,494 flights62.6%
- 8pm–5am12,139 flights64.7%
Scale runs 55% to 95%.
The 5pm–8pm window is where this operation falls apart: 62.6% on time, against 91.7% 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 8am–11am window is the busiest, with 19,557 flights scheduled in it.
Across the year
Seasonal pattern
June is the worst month at 64.4% on time, 18 points below January, the best at 82.5%. 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. May was the busiest month here, with 7,611 flights.
Delay causes
What holds this operation up
- 50%Late-arriving aircraft
- 34%Carrier
- 15%National Airspace System
- 1%Extreme weather
- 0%Security
50% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 1.13 million reported delay minutes here, that single category outweighs weather by 44 to one. The split is drawn from 1,125,248 reported delay minutes.
Cancellations are rare at 0.60%, 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.
6.8% 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.
86,407 flights sit behind these numbers, which is a large enough sample that the headline rate is not moving on noise. Where a sub-group falls below 30 flights the site shows a dash instead of a percentage.
Put together: the calendar is the biggest lever here, not the carrier or the hour. January runs 82.5% on time and June 64.4%, a swing of 18 points. If the dates move at all, move them out of June before you think about anything else. 85,710 completed flights over 12 months sit behind that.
Common questions
Southwest Airlines at LAS
How often is Southwest Airlines at LAS delayed?
About one flight in four arrives at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 26.6% of the 86,407 flights in this analysis, against 22.7% nationally. Delayed flights are late by about 50 minutes on average.
Which airline is most reliable on Southwest Airlines at LAS?
Spirit Airlines leads at 85.0% on time across 5,509 flights. Hawaiian Airlines is at the other end on 70.6%, a gap of 14 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 Southwest Airlines at LAS?
The 5am–8am departure window is the strongest at 91.7% on time. The 5pm–8pm window is the weakest at 62.6%, 29 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 June delays on Southwest Airlines at LAS?
June is the weakest month at 64.4% on time, compared with 82.5% in January. Across the year that is 18 points between the best and worst months. Moving flexible dates out of that month is one of the few things that reliably helps.
Related
Where to go next
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.