Route reliability record
MIA→LAS
Miami to Las Vegas
- Flights
- 1,429
- Period
- July 2025 to June 2026
- Distance
- 2,174 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 77.6%. The late ones land about an hour behind schedule. That rests on 1,429 MIA to LAS flights, with a median arrival 4 minutes early.
Best time to fly MIA to LAS: a 5am–8am departure, ideally on a Wednesday. Flights in that window arrived on time 89.7% of the time and Wednesday flights 77.5%, against 73.5% for the route overall.
The national on-time rate over the same period is 77.6%, so this route runs 4 points behind the country as a whole. Across a thousand flights that is about 41 extra late arrivals.
Key figures
On time
73.5%
Arrivals under 15 minutes late, of 1,410 completed flights
Avg delay
66 min
Across delayed arrivals only, not all flights
Cancelled
0.98%
National rate is 1.81%
Best carrier
American
73.2% on time across 1,277 flights
These figures cover 1,429 flights between July 2025 and June 2026. Beyond the headline rate, 9.1% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.
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 |
|---|---|---|---|---|---|
| Frontier Airlinesthin sample | 77 | 82.9% | 72 min | 1.30% | B |
| American Airlines | 1,277 | 73.2% | 66 min | 0.86% | C+ |
| Spirit Airlinesthin sample | 72 | 68.6% | 69 min | 2.78% | C |
| Delta Air Linesthin sample | 3 | 66.7% | 44 min | 0.00% | C+ |
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 | 78.4% | 79.5% | 1.41% | 5am–8am, Wed | B6 1707 07:00 |
| 2. MIA → LASMiami to Las Vegas | American Airlines | 72.6% | 73.2% | 0.86% | 5am–8am, 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. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am69 flights89.7%
- 8am–11am384 flights89.0%
- 11am–2pm1 flights—
- 2pm–5pm207 flights62.9%
- 5pm–8pm366 flights66.3%
- 8pm–5am402 flights67.7%
Scale runs 55% to 95%. Rows with fewer than 30 flights show a dash.
Book the early departure. Flights leaving between 5am–8am arrive on time 89.7% of the time, against 62.9% for the afternoon window. That is 27 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 8pm–5am window is the busiest, with 402 flights scheduled in it.
Across the year
When delays peak on this route
This route's year swings by 18 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 64.0% on time, 18 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 161 flights.
Across the week, Wednesday is the strongest day at 77.5% on time and Sunday the weakest at 61.9%. 16 points is a smaller lever than departure hour, but it is free.
Delay causes
Why this route gets delayed
Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 25,000 reported delay minutes.
- 41%Late-arriving aircraft
- 36%Carrier
- 18%National Airspace System
- 5%Extreme weather
- 0%Security
41% 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 25,000 reported delay minutes here, that single category outweighs weather by 8 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 24,816 reported delay minutes.
The largest share of delay minutes, 36%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 8,894 of the 25,000 delay minutes reported here.
Cancellations sit at 0.98% against a national 1.81%, which is ordinary. Diversions add another 0.35%.
Connections and stage length
What a delay here actually costs
For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 9.1% of arrivals land a full hour or more behind schedule, against 8.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum 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 82.0% on time across 1,424 flights, 9 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 9 points of difference.
The sample behind these figures is 1,429 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 June 64.0%, a swing of 18 points. If the dates move at all, move them out of June before you think about anything else. 1,410 completed flights over 12 months sit behind that.
Common questions
MIA to LAS questions
How often is MIA 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 26.5% of the 1,429 flights in this analysis, against 22.4% nationally. Delayed flights are late by about an hour on average.
How reliable is MIA to LAS compared with the rest of the country?
73.5% of flights arrive on time here against a national 77.6%, a difference of 4 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 5am–8am departure window is the strongest at 89.7% on time. The 2pm–5pm window is the weakest at 62.9%, 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 June delays on MIA to LAS?
June is the weakest month at 64.0% on time, compared with 82.4% in March. 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
- LAS to MIA — the return legseparate record
- Miami International (MIA) delay statistics
- Harry Reid International (LAS) delay statistics
- MIA to ATL, a related route73.7%
- LAX to LAS, a related route76.5%
- MIA to LGA, a related route68.0%
- Frontier Airlines on-time record82.9%
- American Airlines on-time record73.2%
- Spirit Airlines on-time record68.6%
- Why the first flight of the morning is statistically safest
- The best time of day to fly, according to 7.04 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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.