Route reliability record
MIA→LAX
Miami to Los Angeles
- Flights
- 3,251
- Period
- September 2025 to August 2026
- Distance
- 2,342 mi
- Carriers
- 2
This route sits in the middle of the pack with a B+. Close to three flights in four arrive on time by the DOT's definition, 2 points worse than the national rate of 77.3%. The late ones land a little over an hour behind schedule. That rests on 3,251 MIA to LAX flights, of which Delta Air Lines flew 494 at 77.7% on time.
Best time to fly MIA to LAX: a 5am–8am departure, ideally on a Wednesday. Flights in that window arrived on time 86.1% of the time and Wednesday flights 81.4%, against 75.2% 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
75.2%
Arrivals under 15 minutes late, of 3,219 completed flights
Avg delay
69 min
Across delayed arrivals only, not all flights
Cancelled
0.68%
National rate is 1.89%
Best carrier
Delta
77.7% on time across 494 flights
These figures cover 3,251 flights between September 2025 and August 2026. Beyond the headline rate, 8.1% 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 LAX
The two carriers here are closely matched: 3 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 |
|---|---|---|---|---|---|
| Delta Air Lines | 494 | 77.7% | 80 min | 1.62% | B |
| American Airlines | 2,757 | 74.8% | 68 min | 0.51% | C+ |
No carrier stands out. Delta tops the table at 77.7%, 3 points clear of the bottom, which is inside the range this kind of sample moves year to year.
Flight by flight
Flights on MIA to LAX
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 Miami to Los Angeles
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. 2 of the top 4 use a different airport at one end.
| Option | Airline | Success | On time | Cancelled | Best departure | Most punctual flight |
|---|---|---|---|---|---|---|
| 1. FLL → LAXFort Lauderdale to Los Angeles | Delta Air Lines | 81.9% | 83.2% | 1.59% | 8am–11am, Wed | DL 800 07:05 |
| 2. MIA → LAXMiami to Los Angeles | Delta Air Lines | 76.4% | 77.7% | 1.62% | 8am–11am, Wed | DL 450 07:50 |
| 3. FLL → LAXFort Lauderdale to Los Angeles | JetBlue Airways | 74.9% | 75.6% | 0.99% | 5am–8am, Thu | B6 2801 09:20 |
| 4. MIA → LAXMiami to Los Angeles | American Airlines | 74.4% | 74.8% | 0.51% | 5am–8am, Wed | — |
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 21 points, against 3 points between the best and worst carrier.
- 5am–8am712 flights86.1%
- 8am–11am624 flights86.0%
- 11am–2pm209 flights76.6%
- 2pm–5pm427 flights70.1%
- 5pm–8pm721 flights65.7%
- 8pm–5am558 flights64.9%
Scale runs 55% to 90%.
The 8pm–5am window is where this operation falls apart: 64.9% on time, against 86.1% 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 5pm–8pm window is the busiest, with 721 flights scheduled in it.
Explore
Filter MIA to LAX 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 LAX, the best departure window is 5am–8am at 86.1% on time and the worst is 8pm–5am at 64.9%, a wide gap of 21.2 points. All US flights leaving 5am–8am ran 89.3%.
- 5–8am86.1%
- 8–11am86.0%
- 11am–2pm76.6%
- 2–5pm70.1%
- 5–8pm65.7%
- 8pm–5am64.9%
best all US flightsScale 55% to 95%.
Across the year
When delays peak on this route
This route's year swings by 15 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 66.5% on time, 15 points below October, the best at 81.0%. 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 304 flights.
Across the week, Wednesday is the strongest day at 81.4% on time and Sunday the weakest at 64.9%, a spread of 17 points.
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 55,000 reported delay minutes.
- 39%Late-arriving aircraft
- 39%Carrier
- 14%National Airspace System
- 8%Extreme weather
- 0%Security
39% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 55,000 reported delay minutes here, that single category outweighs weather by 5 to one. The split is drawn from 55,229 reported delay minutes.
The largest share of delay minutes, 39%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 21,000 of the 55,000 delay minutes reported here.
Cancellations are rare at 0.68%, 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
8.1% 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 a little over an hour, which a normal layover absorbs.
At 2,342 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 78.4% on time across 3,256 flights, 3 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 3 points of difference.
The sample behind these figures is 3,251 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 LAX 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. October runs 81.0% on time and July 66.5%, a swing of 15 points. If the dates move at all, move them out of July before you think about anything else. 3,219 completed flights over 12 months sit behind that.
Common questions
MIA to LAX questions
How often is MIA to LAX 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 24.8% of the 3,251 flights in this analysis, against 22.7% nationally. Delayed flights are late by a little over an hour on average.
Which airline is most reliable on MIA to LAX?
Delta Air Lines leads at 77.7% on time across 494 flights. American Airlines is at the other end on 74.8%, a gap of 3 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 MIA to LAX?
The 5am–8am departure window is the strongest at 86.1% on time. The 8pm–5am window is the weakest at 64.9%, 21 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 LAX?
July is the weakest month at 66.5% on time, compared with 81.0% in October. Across the year that is 15 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
- LAX to MIA — the return legseparate record
- Miami International (MIA) delay statistics
- Los Angeles International (LAX) delay statistics
- Delta Air Lines on MIA to LAX77.7%
- American Airlines on MIA to LAX74.8%
- MIA to ATL, a related route74.2%
- SFO to LAX, a related route70.9%
- MIA to LGA, a related route67.4%
- Delta Air Lines on-time record77.7%
- American Airlines on-time record74.8%
- 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 LAX and LAX 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.