Carrier route record

DLMIA→LAX

Delta Air Lines · Miami to Los Angeles

Flights: 494
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 MIA to LAX lands a B, 2 points better than the national rate of 77.6%. About one flight in five 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 494 flights, with a median arrival 7 minutes early.

The US average over the same twelve months is 77.6%, so there is little to separate Delta on MIA to LAX from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.

On time

79.9%

Arrivals under 15 minutes late, of 487 completed flights

Avg delay

77 min

Across delayed arrivals only, not all flights

Cancelled

1.21%

National rate is 1.81%

Whole route

75.2%

Every carrier on MIA to LAX, 3,245 flights

These figures cover 494 flights between July 2025 and June 2026. The median arrival is 7 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

Delta against every carrier on MIA to LAX

Delta flew 494 of the 3,245 flights on MIA to LAX, about 15% of it. Its 79.9% on time is 5 points better than the route as a whole, which runs 75.2%. Ranked by on-time rate it is first of two carriers on the route, where the range runs from Delta at 79.9% to American at 74.3%.

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.

On-time performance by carrier on MIA to LAX
Airline	Flights	On time	Avg delay	Cancelled	Grade
Delta Air Lines (this page)	494	79.9%	77 min	1.21%	B
American Airlines	2,751	74.3%	68 min	0.47%	C+

Flight by flight

Delta flight numbers on MIA to LAX

DL 45007:5084.8% · 365 flights

Departure window

When Delta runs best on this route

Departure time matters more here than the choice of carrier. The gap between the best and worst window is 19 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–8am201 flights85.4%
8am–11am140 flights85.7%
11am–2pm—
2pm–5pm—
5pm–8pm145 flights66.7%
8pm–5am8 flights—

Scale runs 60% to 90%. Rows with fewer than 30 flights show a dash.

Book the morning departure. Flights leaving between 8am–11am arrive on time 85.7% of the time, against 66.7% for the evening window. That is 19 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 5am–8am window is the busiest, with 201 flights scheduled in it.

Across the year

Delta on MIA to LAX through the year

Darker means more delays. Figures are on-time percentages.August best, February worst

February is the weak month at 69.0% on time, against 93.5% in August. Winter delays cluster: a single storm system can account for most of a month's shortfall, so an average December hides both very good weeks and genuinely unflyable days. April was the busiest month here, with 58 flights.

Across the week, Wednesday is the strongest day at 88.9% on time and Sunday the weakest at 67.5%. 21 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. Late-arriving aircraft accounts for 49% of the 7,516 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.

Late-arriving aircraft
49%
Carrier
36%
National Airspace System
14%
Extreme weather
1%

49% 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 7,516 reported delay minutes here, that single category outweighs weather by 40 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 7,516 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 2,704 of the 7,516 delay minutes reported here.

Cancellations sit at 1.21% against a national 1.81%, which is ordinary. Diversions add another 0.20%.

Connections and stage length

What a delay here costs

6.2% 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 2,342 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 73.7% on time across 495 flights, 6 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 6 points of difference.

One caution: this is a thin sample. 494 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 MIA to LAX

Put together: treat all of this as provisional. 494 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 79.9% 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.

Where to go next

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.

Key figures