Carrier route record
DLLAX→MIA
Delta Air Lines · Los Angeles to Miami
- Flights
- 495
- Period
- July 2025 to June 2026
- Share of route
- 15%
- Carriers
- 2
Historical statistics for July 2025 to June 2026, not live status. For today’s flights, check with Delta Air Lines.
Delta on LAX to MIA 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 55 minutes behind schedule. That rests on 495 flights, with a median arrival 1 minute early.
The US average over the same twelve months is 77.6%, so there is little to separate Delta on LAX to MIA from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.
Key figures
On time
73.7%
Arrivals under 15 minutes late, of 487 completed flights
Avg delay
54 min
Across delayed arrivals only, not all flights
Cancelled
1.21%
National rate is 1.81%
Whole route
78.4%
Every carrier on LAX to MIA, 3,248 flights
These figures cover 495 flights between July 2025 and June 2026. On-time means an arrival less than 15 minutes after the scheduled gate time, the same threshold the Department of Transportation uses in its own reports. Cancelled and diverted flights are excluded from the on-time rate and counted separately, which is why the cancellation column matters on its own.
Carrier by carrier
Delta against every carrier on LAX to MIA
Delta flew 495 of the 3,248 flights on LAX to MIA, about 15% of it. Its 73.7% on time is 5 points worse than the route as a whole, which runs 78.4%. Ranked by on-time rate it is last of two carriers on the route, where the range runs from American at 79.2% to Delta at 73.7%.
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 | 2,753 | 79.2% | 73 min | 0.58% | B+ |
| Delta Air Lines (this page) | 495 | 73.7% | 54 min | 1.21% | C |
Flight by flight
Delta flight numbers on LAX to MIA
Departure window
When Delta runs best on this route
Departure time is the single lever a traveller controls, and it moves the odds more than most people expect. Each bar below is the on-time rate for flights scheduled to leave inside that window, across 495 flights.
- 5am–8am4 flights—
- 8am–11am361 flights76.0%
- 11am–2pm—
- 2pm–5pm—
- 5pm–8pm—
- 8pm–5am130 flights67.4%
Scale runs 60% to 80%. Rows with fewer than 30 flights show a dash.
Book the morning departure. Flights leaving between 8am–11am arrive on time 76.0% of the time, against 67.4% for the overnight window. That is 9 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 8am–11am window is the busiest, with 361 flights scheduled in it.
Across the year
Delta on LAX to MIA through the year
September is the best month on the calendar at 93.3% on time. Shoulder season thins the schedule and takes the summer weather with it, and the operation gets its margin back. April was the busiest month here, with 58 flights.
Across the week, Wednesday is the strongest day at 84.4% on time and Saturday the weakest at 66.1%. 18 points is a smaller lever than departure hour, but it is free.
Delay causes
Why Delta runs late on this route
One category carries most of the weight here. Carrier accounts for 53% of the 6,914 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.
- 53%Carrier
- 30%National Airspace System
- 17%Late-arriving aircraft
- 1%Security
The largest share of delay minutes, 53%, 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 3,643 of the 6,914 delay minutes reported here. The split is drawn from 6,914 reported delay minutes.
Cancellations sit at 1.21% against a national 1.81%, which is ordinary. Diversions add another 0.40%.
Connections and stage length
What a delay here costs
5.1% 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 about 55 minutes, 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 79.9% on time across 494 flights, 6 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 6 points of difference.
One caution: this is a thin sample. 495 flights over twelve months is enough to clear this site's floor but not enough to pin the rate down tightly, and a single bad week moves it by more than a point. Treat the grade as a rough reading.
What to do with this
Booking Delta on LAX to MIA
Put together: treat all of this as provisional. 495 flights over twelve months is enough to clear this site's floor and not enough to be confident to better than a couple of points. The 73.7% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 487 completed flights over 12 months sit behind that.
Related
Where to go next
- LAX to MIA, every carrier
- Delta on MIA to LAX, the return leg
- American Airlines on LAX to MIA79.2%
- Delta Air Lines network-wide record
- Los Angeles International (LAX) delay statistics
- Miami International (MIA) delay statistics
- 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
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.