Carrier performance at one airport
WN→LAS
Southwest Airlines at Harry Reid International
- Departures
- 86,261
- Period
- July 2025 to June 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, 3 points worse than the national rate of 77.6%. The late ones land about 50 minutes behind schedule. That rests on 86,261 flights, of which Delta Air Lines flew 15,755 at 85.6% on time.
Measured against the airport rather than the country, Southwest Airlines runs 4 points behind the 77.9% 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
74.3%
85,551 completed departures
Avg delay
50 min
Across delayed flights only
Cancelled
0.58%
At LAS, this carrier only
Rank here
#10
Of 11 carriers clearing the floor at LAS
These figures cover 86,000 flights between July 2025 and June 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. Delta Air Lines arrives on time 85.6% of the time; Hawaiian Airlines manages 69.4%. Sample sizes sit next to every figure, because a two-point gap across 855 flights means less than a ten-point one.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Delta Air Lines | 15,755 | 85.6% | 77 min | 1.00% | A |
| Allegiant Air | 7,115 | 83.8% | 74 min | 0.45% | B+ |
| Spirit Airlines | 8,396 | 82.8% | 77 min | 1.49% | B |
| American Airlines | 14,073 | 81.5% | 95 min | 1.86% | B |
| United Airlines | 15,170 | 80.7% | 67 min | 0.66% | B+ |
| SkyWest Airlines | 3,769 | 80.6% | 71 min | 1.01% | B |
| Alaska Airlines | 6,759 | 79.4% | 60 min | 1.02% | B |
| JetBlue Airways | 3,919 | 78.6% | 78 min | 1.91% | B |
| Frontier Airlines | 12,272 | 77.7% | 76 min | 1.25% | B |
| Southwest Airlines (this page) | 86,261 | 74.3% | 50 min | 0.58% | C+ |
| Hawaiian Airlines | 855 | 69.4% | 86 min | 0.47% | C+ |
The spread between Delta and Hawaiian is 16 points, wide enough that it should decide the booking. On a hundred trips that is 16 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 | 3,738 | 62.5% | 50 min | 0.99% | D+ |
| LAS to PHX · Phoenix | 3,446 | 76.4% | 53 min | 1.04% | B |
| LAS to SMF · Sacramento | 3,432 | 77.0% | 53 min | 0.32% | B+ |
| LAS to SJC · San Jose | 3,255 | 77.9% | 52 min | 0.34% | B+ |
| LAS to RNO · Reno | 3,215 | 78.5% | 52 min | 0.56% | B+ |
| LAS to BUR · Burbank | 3,163 | 77.6% | 54 min | 1.07% | B |
| LAS to OAK · Oakland | 3,161 | 71.4% | 52 min | 0.38% | C+ |
| LAS to DEN · Denver | 3,118 | 70.7% | 57 min | 1.12% | C |
| LAS to DAL · Dallas | 2,860 | 71.5% | 50 min | 1.71% | C |
| LAS to SNA · Santa Ana | 2,498 | 78.8% | 48 min | 0.52% | B+ |
| LAS to LAX · Los Angeles | 2,386 | 68.2% | 47 min | 0.38% | C+ |
| LAS to MDW · Chicago | 2,343 | 76.3% | 49 min | 0.85% | B+ |
| LAS to AUS · Austin | 2,176 | 73.3% | 50 min | 0.23% | C+ |
| LAS to LGB · Long Beach | 2,150 | 77.7% | 46 min | 0.37% | B+ |
| LAS to HOU · Houston | 2,047 | 73.7% | 47 min | 0.39% | C+ |
| LAS to BNA · Nashville | 1,781 | 78.7% | 44 min | 0.62% | B+ |
| LAS to STL · St. Louis | 1,778 | 78.2% | 54 min | 0.17% | B+ |
| LAS to ONT · Ontario | 1,755 | 73.2% | 49 min | 0.74% | C+ |
| LAS to MCI · Kansas City | 1,705 | 75.1% | 47 min | 0.23% | B+ |
| LAS to ABQ · Albuquerque | 1,696 | 75.8% | 52 min | 0.35% | B+ |
| LAS to BWI · Baltimore | 1,625 | 78.5% | 46 min | 0.92% | B+ |
| LAS to SAT · San Antonio | 1,564 | 73.3% | 50 min | 0.19% | C+ |
| LAS to SLC · Salt Lake City | 1,443 | 76.5% | 51 min | 0.49% | B+ |
| LAS to SFO · San Francisco | 1,310 | 48.8% | 54 min | 0.38% | F+ |
| LAS to TUS · Tucson | 1,248 | 76.0% | 51 min | 0.32% | 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 28 points, against 16 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am11,987 flights92.1%
- 8am–11am19,618 flights84.0%
- 11am–2pm13,846 flights73.6%
- 2pm–5pm14,449 flights64.8%
- 5pm–8pm14,517 flights64.4%
- 8pm–5am11,844 flights65.1%
Scale runs 55% to 100%. Rows with fewer than 30 flights show a dash.
The 5pm–8pm window is where this operation falls apart: 64.4% on time, against 92.1% 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 19,618 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
- 35%Carrier
- 14%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. That is a cascade, and cascades start small and grow through the day. Across 1.09 million reported delay minutes here, that single category outweighs weather by 37 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 1,091,908 reported delay minutes.
Cancellations are rare at 0.58%, below the national 1.81% 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.
6.5% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route are the about 50 minutes kind, which a normal layover absorbs.
86,261 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. 85,551 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 arrive at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 25.7% of the 86,261 flights in this analysis, against 22.4% nationally. Delayed flights are late by about 50 minutes on average.
Which airline is most reliable on Southwest Airlines at LAS?
Delta Air Lines leads at 85.6% on time across 15,755 flights. Hawaiian Airlines is at the other end on 69.4%, a gap of 16 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 92.1% on time. The 5pm–8pm window is the weakest at 64.4%, 28 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
- Southwest Airlines network-wide record
- Harry Reid International (LAS) all carriers
- LAS to SAN route record62.5%
- LAS to PHX route record76.4%
- LAS to SMF route record77.0%
- LAS to SJC route record77.9%
- Why the first flight of the morning is statistically safest
- The best time of day to fly, according to 7.04 million flight records
Source: US DOT Bureau of Transportation Statistics, on-time performance data, July 2025 to June 2026. Updated monthly. How this data is collected.