Route reliability record
MIA→LAS
Miami to Las Vegas
- Flights
- 1,379
- Period
- September 2025 to August 2026
- Distance
- 2,174 mi
- Carriers
- 4
This route sits in the middle of the pack with a C+. About seven flights in ten arrive on time by the DOT's definition, 5 points worse than the national rate of 77.3%. The late ones land about an hour behind schedule. That rests on 1,379 MIA to LAS flights, with a median arrival 4 minutes early.
Best time to fly MIA to LAS: a 8am–11am departure, ideally on a Wednesday. Flights in that window arrived on time 88.8% of the time and Wednesday flights 79.5%, against 72.2% for the route overall.
The national on-time rate over the same period is 77.3%, so this route runs 5 points behind the country as a whole. Across a thousand flights that is about 51 extra late arrivals.
Key figures
On time
72.2%
Arrivals under 15 minutes late, of 1,361 completed flights
Avg delay
67 min
Across delayed arrivals only, not all flights
Cancelled
0.80%
National rate is 1.89%
Best carrier
American
73.6% on time across 1,248 flights
These figures cover 1,379 flights between September 2025 and August 2026. Beyond the headline rate, 10.1% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Carrier by carrier
Which airline is most reliable on MIA to LAS
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 |
|---|---|---|---|---|---|
| American Airlines | 1,248 | 73.6% | 62 min | 0.72% | C+ |
| Delta Air Linesthin sample | 3 | 66.7% | 44 min | 0.00% | C+ |
| Frontier Airlinesthin sample | 95 | 59.6% | 104 min | 1.05% | D |
| Spirit Airlinesthin sample | 33 | 53.1% | 63 min | 3.03% | F− |
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Best ways to make this trip
The most reliable ways to fly Miami to Las Vegas
Every airline on this route and on the routes between nearby airports, ranked by how often a scheduled flight actually operated and arrived on time. 1 of the top 2 use a different airport at one end.
| Option | Airline | Success | On time | Cancelled | Best departure | Most punctual flight |
|---|---|---|---|---|---|---|
| 1. FLL → LASFort Lauderdale to Las Vegas | JetBlue Airways | 76.8% | 77.9% | 1.44% | 5am–8am, Wed | B6 1707 07:00 |
| 2. MIA → LASMiami to Las Vegas | American Airlines | 73.1% | 73.6% | 0.72% | 8am–11am, Wed (route) | — |
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 27 points, against half a point between the best and worst carrier.
- 5am–8am21 flights—
- 8am–11am404 flights88.8%
- 11am–2pm8 flights—
- 2pm–5pm181 flights69.3%
- 5pm–8pm361 flights65.5%
- 8pm–5am404 flights62.3%
Scale runs 55% to 95%. Rows with fewer than 30 flights show a dash.
The 8pm–5am window is where this operation falls apart: 62.3% on time, against 88.8% for the 8am–11am 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 404 flights scheduled in it.
Explore
Filter MIA 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 MIA to LAS, the best departure window is 8am–11am at 88.8% on time and the worst is 8pm–5am at 62.3%, a wide gap of 26.5 points. All US flights leaving 8am–11am ran 83.9%.
- 5–8am—
- 8–11am88.8%
- 11am–2pm—
- 2–5pm69.3%
- 5–8pm65.5%
- 8pm–5am62.3%
best all US flightsScale 55% to 95%. Cells under 30 flights show a dash.
Across the year
When delays peak on this route
This route's year swings by 26 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.
July is the worst month at 56.0% on time, 26 points below March, the best at 82.4%. 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. July was the busiest month here, with 151 flights.
Across the week, Wednesday is the strongest day at 79.5% on time and Sunday the weakest at 64.6%, a spread of 15 points.
Delay causes
Why this route gets delayed
Late-arriving aircraft accounts for 43% of the 25,000 delay minutes carriers reported here, and the remaining four split what is left.
- 43%Late-arriving aircraft
- 34%Carrier
- 17%National Airspace System
- 6%Extreme weather
- 0%Security
43% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 25,000 reported delay minutes here, that single category outweighs weather by 7 to one. The split is drawn from 25,196 reported delay minutes.
The practical consequence: the 8am–11am departure is the one that starts clean. Its aircraft has no earlier leg to be late from, which is exactly why that window shows 88.8% on time here.
Cancellations are rare at 0.80%, 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
10.1% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection here, and two hours if the onward flight is on a separate ticket.
At 2,174 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 82.6% on time across 1,376 flights, 10 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 10 points of difference.
The sample behind these figures is 1,379 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. March runs 82.4% on time and July 56.0%, a swing of 26 points. If the dates move at all, move them out of July before you think about anything else. 1,361 completed flights over 12 months sit behind that.
Common questions
MIA to LAS questions
How often is MIA to LAS delayed?
Roughly 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 27.8% of the 1,379 flights in this analysis, against 22.7% nationally. Delayed flights are late by about an hour on average.
How reliable is MIA to LAS compared with the rest of the country?
72.2% of flights arrive on time here against a national 77.3%, a difference of 5 points against it. That is worth a C+ on this site's grading scale.
What time of day has the fewest delays on MIA to LAS?
The 8am–11am departure window is the strongest at 88.8% on time. The 8pm–5am window is the weakest at 62.3%, 27 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 July delays on MIA to LAS?
July is the weakest month at 56.0% on time, compared with 82.4% in March. Across the year that is 26 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 MIA — the return legseparate record
- Miami International (MIA) delay statistics
- Harry Reid International (LAS) delay statistics
- MIA to ATL, a related route74.2%
- LAX to LAS, a related route75.8%
- MIA to LGA, a related route67.4%
- American Airlines on-time record73.6%
- Delta Air Lines on-time record66.7%
- Frontier Airlines on-time record59.6%
- 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. MIA to LAS and LAS to MIA 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.