Flight number record
DL 811
Delta Air Lines · Los Angeles to Miami
- Route
- LAX → MIA
- Departs
- 09:05
- Flights
- 365
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 811, check with Delta Air Lines.
DL 811 lands a B, about a point worse than the national rate of 77.3%. About one flight in four arrives 15 minutes late or worse, and those flights are late by about 45 minutes on average. That rests on 365 flights, with a median arrival 3 minutes early.
Key figures
On time
76.1%
Arrivals under 15 minutes late, of 355 completed flights
Avg delay
44 min
Across delayed arrivals only, not all flights
Cancelled
1.92%
National rate is 1.89%
1 hour+ late
5.1%
National rate is 8.3%
These figures cover 365 flights between September 2025 and August 2026. The median arrival is 3 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.
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Schedule
When DL 811 flies
DL 811 flies LAX to MIA without a single fixed slot. Its most common scheduled departure was 09:05, used on 52 of 365 flights.
- Departs 09:0552 flights14.2%
Scale runs 0% to 100%.
Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.
A 09:05 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and DL 811 runs 8 points worse at 76.1%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
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Against the route
DL 811 next to LAX to MIA
Every carrier on LAX to MIA combined arrived on time 78.4% of the time across 3,256 flights, so DL 811 is 2 points behind it. Across its whole network Delta Air Lines managed 81.1%, which this flight trails by 5 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 811 | 365 | 76.1% | 44 min | 1.92% | B |
| All Delta Air Lines on LAX–MIA | 495 | 73.8% | 52 min | 1.62% | C |
| All carriers on LAX–MIA | 3,256 | 78.4% | 65 min | 0.77% | B+ |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 811 quarter by quarter
DL 811 did not run the same all year. Its best quarter was Jul–Sep 2025 at 93.3% on time and its weakest Jan–Mar 2026 at 63.2%, a swing of 30 points on roughly 73 flights a quarter. The twelve-month rate averages over that, so if you are flying in a weak quarter the quarter's own figure is the better guide.
- Jul–Sep 202530 flights93.3%
- Oct–Dec 202592 flights74.7%
- Jan–Mar 202690 flights63.2%
- Apr–Jun 202691 flights84.1%
- Jul–Sep 202662 flights76.3%
Scale runs 55% to 100%.
By weekday, DL 811 did best on Wednesday at 90.2% on time and worst on Sunday at 70.6%. Each day rests on about 52 flights, so a gap of 20 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 811 runs when it is late
DL 811 often beats the schedule: 92 of 355 completed flights, 26%, arrived 15 minutes or more early. The 85 late arrivals split 39 under half an hour, 28 between 30 and 60 minutes, and 18 an hour or more.
- 15+ min early92 flights25.9%
- Within 15 min178 flights50.1%
- 15–29 min late39 flights11.0%
- 30–59 min late28 flights7.9%
- 1–2 hours late15 flights4.2%
- 2+ hours late3 flights0.8%
Scale runs 0% to 100%.
Share of 355 completed flights by arrival against schedule.
15 of 52 late departures made up the time and arrived on time, 29% of them. In the other direction, 48 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at MIA.
The worst days
Worst days for DL 811
The latest arrival of the period was on 21 December 2025, 3 hours 17 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The five worst days are spread across December, June, January, September and February, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 21 December 2025 | 3 hours 17 minutes | Carrier |
| 6 June 2026 | 2 hours 52 minutes | Late-arriving aircraft |
| 5 January 2026 | 2 hours 10 minutes | Carrier |
| 8 September 2025 | 1 hour 47 minutes | National Airspace System |
| 3 February 2026 | 1 hour 43 minutes | Late-arriving aircraft |
Delay causes
Why DL 811 runs late
National Airspace System accounts for 50% of the 3,759 delay minutes carriers reported here, and the remaining four split what is left.
- 50%National Airspace System
- 31%Carrier
- 19%Late-arriving aircraft
50% of delay minutes are charged to the National Airspace System: air traffic volume, runway configuration, ground stops. No carrier can price its way out of that, which is why airport choice moves the number here more than carrier choice does. That is 1,880 minutes out of 3,759, against a national NAS share of 21%. The split is drawn from 3,759 delay minutes reported on DL 811.
Cancellations sit at 1.92% against a national 1.89%, which is ordinary. Diversions add another 0.82%.
Connections and routes
What a delay on this flight costs
5.1% 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 about 45 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 same number turns up on one other city pair in the data, including MIA to LAX (60), but none flew often enough under DL 811 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to LAX to MIA only.
One caution: this is a thin sample. 365 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 DL 811
For a booking, read DL 811 as 76.1% on time with 1.92% cancelled over 365 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- LAX to MIA, every carrier and departure
- MIA to LAX, the return direction
- Los Angeles International (LAX) delay statistics
- Miami International (MIA) delay statistics
- Delta Air Lines on-time record
- Every Delta Air Lines flight number with a record
- The most and least reliable flight numbers in the US
- Worst months to fly in the US, ranked by the data
A flight number here means Delta Air Lines’s own number as it reports to the DOT. How the figures are computed is on the methodology page.
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.