Route reliability record
LAS→MIA
Las Vegas to Miami
- Flights
- 1,424
- Period
- July 2025 to June 2026
- Distance
- 2,174 mi
- Carriers
- 4
This route lands a B+, 4 points better than the national rate of 77.6%. About one flight in six arrives 15 minutes late or worse, and those flights are late by a little over an hour on average. That is a workable record, not a spotless one. That rests on 1,424 LAS to MIA flights, with a median arrival 10 minutes early.
Best time to fly LAS to MIA: a 5am–8am departure, ideally on a Tuesday. Flights in that window arrived on time 90.2% of the time and Tuesday flights 86.8%, against 82.0% for the route overall.
Set against the rest of the country, this route's record is 4 points better than the US average of 77.6%. That gap is worth roughly 44 fewer late arrivals for every thousand flights.
Key figures
On time
82.0%
Arrivals under 15 minutes late, of 1,401 completed flights
Avg delay
76 min
Across delayed arrivals only, not all flights
Cancelled
0.84%
National rate is 1.81%
Best carrier
American
84.1% on time across 1,277 flights
These figures cover 1,424 flights between July 2025 and June 2026. The median arrival is 10 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.
Carrier by carrier
Which airline is most reliable on LAS to MIA
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 |
|---|---|---|---|---|---|
| Delta Air Linesthin sample | 3 | 100.0% | — | 0.00% | A+ |
| American Airlines | 1,277 | 84.1% | 85 min | 0.86% | B+ |
| Frontier Airlinesthin sample | 75 | 65.3% | 46 min | 0.00% | C+ |
| Spirit Airlinesthin sample | 69 | 60.3% | 41 min | 1.45% | D |
Best ways to make this trip
The most reliable ways to fly Las Vegas to Miami
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. LAS → MIALas Vegas to Miami | American Airlines | 83.4% | 84.1% | 0.86% | 5am–8am, Tue (route) | — |
| 2. LAS → FLLLas Vegas to Fort Lauderdale | JetBlue Airways | 75.1% | 76.7% | 2.05% | 5am–8am, Tue | B6 1708 12:10 |
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 14 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–8am279 flights90.2%
- 8am–11am170 flights83.0%
- 11am–2pm396 flights76.1%
- 2pm–5pm17 flights—
- 5pm–8pm—
- 8pm–5am562 flights81.6%
Scale runs 70% to 95%. Rows with fewer than 30 flights show a dash.
The weak window here is the middle of the day, not the evening: 11am–2pm runs 76.1% on time against 90.2% for 5am–8am. That shape usually means a departure bank rather than an accumulating delay, so the recovery later in the afternoon is real rather than noise. The 8pm–5am window is the busiest, with 562 flights scheduled in it.
Across the year
When delays peak on this route
This route's year swings by 19 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 71.2% on time, 19 points below April, the best at 89.7%. 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 162 flights.
Across the week, Tuesday is the strongest day at 86.8% on time and Sunday the weakest at 75.5%. 11 points is a smaller lever than departure hour, but it is free.
Delay causes
Why this route gets delayed
One category carries most of the weight here. Carrier accounts for 52% of the 19,000 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.
- 52%Carrier
- 32%Late-arriving aircraft
- 14%National Airspace System
- 2%Extreme weather
- 0%Security
The largest share of delay minutes, 52%, 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 9,940 of the 19,000 delay minutes reported here. The split is drawn from 19,170 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 90.2% on time here.
Cancellations are rare at 0.84%, 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.
Connections and stage length
What a delay here actually costs
6.1% 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 last a little over an hour, which a normal layover absorbs.
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 73.5% on time across 1,429 flights, 9 points below 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 1,424 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 MIA 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. April runs 89.7% on time and July 71.2%, a swing of 19 points. If the dates move at all, move them out of July before you think about anything else. 1,401 completed flights over 12 months sit behind that.
Common questions
LAS to MIA questions
How often is LAS to MIA delayed?
About one flight in six arrives at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 18.0% of the 1,424 flights in this analysis, against 22.4% nationally. Delayed flights are late by a little over an hour on average.
How reliable is LAS to MIA compared with the rest of the country?
82.0% of flights arrive on time here against a national 77.6%, a difference of 4 points in its favour. That is worth a B+ on this site's grading scale.
What time of day has the fewest delays on LAS to MIA?
The 5am–8am departure window is the strongest at 90.2% on time. The 11am–2pm window is the weakest at 76.1%, 14 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 LAS to MIA?
July is the weakest month at 71.2% on time, compared with 89.7% in April. Across the year that is 19 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
- MIA to LAS — the return legseparate record
- Harry Reid International (LAS) delay statistics
- Miami International (MIA) delay statistics
- LAS to LAX, a related route78.8%
- ATL to MIA, a related route71.0%
- LAS to DEN, a related route77.0%
- Delta Air Lines on-time record100.0%
- American Airlines on-time record84.1%
- Frontier Airlines on-time record65.3%
- The best time of day to fly, according to 7.04 million flight records
- Worst months to fly in the US, ranked by the data
Direction matters. LAS to MIA and MIA to LAS 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.