Route reliability record
AUS→LAS
Austin to Las Vegas
- Flights
- 2,882
- Period
- September 2025 to August 2026
- Distance
- 1,090 mi
- Carriers
- 4
This route 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 an hour behind schedule. That rests on 2,882 AUS to LAS flights, of which Southwest Airlines flew 2,204 at 74.2% on time.
Best time to fly AUS to LAS: a 5am–8am departure, ideally on a Wednesday. Flights in that window arrived on time 97.6% of the time and Wednesday flights 83.3%, against 73.6% for the route overall.
The US average over the same twelve months is 77.3%, so there is little to separate this route from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.
Key figures
On time
73.6%
Arrivals under 15 minutes late, of 2,864 completed flights
Avg delay
55 min
Across delayed arrivals only, not all flights
Cancelled
0.45%
National rate is 1.89%
Best carrier
Southwest
74.2% on time across 2,204 flights
These figures cover 2,882 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.
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Carrier by carrier
Which airline is most reliable on AUS to LAS
The two carriers here are closely matched: 2 points separate the best from the worst. At that spread, schedule and price are better tie-breakers than reliability. Sample sizes are shown so you can see which rows are worth weighing.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Allegiant Airthin sample | 16 | 81.2% | 95 min | 0.00% | B+ |
| Southwest Airlines | 2,204 | 74.2% | 49 min | 0.36% | C+ |
| Delta Air Lines | 365 | 72.7% | 70 min | 0.55% | C+ |
| Frontier Airlinesthin sample | 297 | 69.7% | 82 min | 1.01% | C |
No carrier stands out. Southwest tops the table at 74.2%, 2 points clear of the bottom, which is inside the range this kind of sample moves year to year.
Flight by flight
Flights on AUS to LAS
The flight numbers below flew this route at least 250 times in the period, busiest first. Each has its own record, with its schedule and delay causes.
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Best ways to make this trip
The most reliable ways to fly Austin to Las Vegas
Every airline on this route, ranked by how often a scheduled flight actually operated and arrived on time, with its best departure time and most punctual flight number. No nearby airport pair beat these.
| Option | Airline | Success | On time | Cancelled | Best departure | Most punctual flight |
|---|---|---|---|---|---|---|
| 1. AUS → LASAustin to Las Vegas | Southwest Airlines | 73.9% | 74.2% | 0.36% | 5am–8am, Wed | — |
| 2. AUS → LASAustin to Las Vegas | Delta Air Lines | 72.3% | 72.7% | 0.55% | 2pm–5pm, Wed | DL 2260 15:25 |
Success is the share of scheduled flights that operated and arrived less than 15 minutes late, so a cancelled flight counts against it. “(route)” means the best time comes from every carrier on the route rather than this airline alone.
Departure window
The best time of day to leave
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 41 points, against 2 points between the best and worst carrier.
- 5am–8am382 flights97.6%
- 8am–11am358 flights93.6%
- 11am–2pm436 flights76.9%
- 2pm–5pm861 flights69.3%
- 5pm–8pm407 flights57.6%
- 8pm–5am438 flights56.1%
Scale runs 50% to 100%.
The 8pm–5am window is where this operation falls apart: 56.1% on time, against 97.6% 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 2pm–5pm window is the busiest, with 861 flights scheduled in it.
Explore
Filter AUS to LAS by airline, time, month and day
Pick a breakdown and a carrier. The dashed mark on each row is the same slice for every US flight.
On AUS to LAS, the best departure window is 5am–8am at 97.6% on time and the worst is 8pm–5am at 56.1%, a wide gap of 41.5 points. All US flights leaving 5am–8am ran 89.3%.
- 5–8am97.6%
- 8–11am93.6%
- 11am–2pm76.9%
- 2–5pm69.3%
- 5–8pm57.6%
- 8pm–5am56.1%
best all US flightsScale 50% to 100%.
Across the year
When delays peak on this route
This route's year swings by 25 points from best month to worst, which is wide. An annual average tells you very little about the week you are actually flying, so read the strip rather than the headline if your dates are fixed.
June is the worst month at 56.2% on time, 25 points below February, the best at 81.4%. 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. March was the busiest month here, with 259 flights.
Across the week, Wednesday is the strongest day at 83.3% on time and Monday the weakest at 67.0%, a spread of 16 points.
Delay causes
Why this route gets delayed
Late-arriving aircraft accounts for 55% of the 42,000 delay minutes carriers reported here, and the remaining four split what is left.
- 55%Late-arriving aircraft
- 27%Carrier
- 17%National Airspace System
- 2%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 42,000 reported delay minutes here, that single category outweighs weather by 34 to one. The split is drawn from 41,906 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 97.6% on time here.
Cancellations are rare at 0.45%, 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 actually costs
7.5% 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 an hour, which a normal layover absorbs.
The 1,090 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty.
The return leg runs 72.8% on time across 2,865 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 2,882 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.
Work out the risk of missing a connection in LAS after this flight
What to do with this
Booking this route
Put together: the calendar is the biggest lever here, not the carrier or the hour. February runs 81.4% on time and June 56.2%, a swing of 25 points. If the dates move at all, move them out of June before you think about anything else. 2,864 completed flights over 12 months sit behind that.
Common questions
AUS to LAS questions
How often is AUS to 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 26.4% of the 2,882 flights in this analysis, against 22.7% nationally. Delayed flights are late by about an hour on average.
Which airline is most reliable on AUS to LAS?
Southwest Airlines leads at 74.2% on time across 2,204 flights. Delta Air Lines is at the other end on 72.7%, a gap of 2 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 AUS to LAS?
The 5am–8am departure window is the strongest at 97.6% on time. The 8pm–5am window is the weakest at 56.1%, 41 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 AUS to LAS?
June is the weakest month at 56.2% on time, compared with 81.4% in February. Across the year that is 25 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
- LAS to AUS — the return legseparate record
- Austin-Bergstrom International (AUS) delay statistics
- Harry Reid International (LAS) delay statistics
- Southwest Airlines on AUS to LAS74.2%
- Delta Air Lines on AUS to LAS72.7%
- Frontier Airlines on AUS to LAS69.7%
- AUS to DEN, a related route78.9%
- LAX to LAS, a related route75.8%
- AUS to DFW, a related route74.9%
- Allegiant Air on-time record81.2%
- Southwest Airlines on-time record74.2%
- Delta Air Lines on-time record72.7%
- Why the first flight of the morning is statistically safest
- The best time of day to fly, according to 7.05 million flight records
Direction matters. AUS to LAS and LAS to AUS are scored separately because they are separate operations, with different departure banks and different aircraft. Compare the return leg.
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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.