Flight number record
DL 450
Delta Air Lines · Miami to Los Angeles
- Route
- MIA → LAX
- Departs
- 07:50
- Flights
- 365
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 450, check with Delta Air Lines.
DL 450 lands a B, 5 points better than the national rate of 77.3%. About one flight in six arrives 15 minutes late or worse, and those flights are late by an hour and a half on average. That rests on 365 flights, with a median arrival 9 minutes early.
Set against the rest of the country, DL 450's record is 5 points better than the US average of 77.3%. That gap is worth roughly 46 fewer late arrivals for every thousand flights.
Key figures
On time
81.9%
Arrivals under 15 minutes late, of 360 completed flights
Avg delay
98 min
Across delayed arrivals only, not all flights
Cancelled
1.10%
National rate is 1.89%
1 hour+ late
6.1%
National rate is 8.3%
These figures cover 365 flights between September 2025 and August 2026. The median arrival is 9 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 450 flies
DL 450 flies MIA to LAX without a single fixed slot. Its most common scheduled departure was 07:50, used on 73 of 365 flights.
- Departs 07:5073 flights20.0%
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 07:50 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and DL 450 runs 7 points worse at 81.9%. 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 450 next to MIA to LAX
Every carrier on MIA to LAX combined arrived on time 75.2% of the time across 3,251 flights, so DL 450 is 7 points ahead of it. Across its whole network Delta Air Lines managed 81.1%, close to this flight's figure.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 450 | 365 | 81.9% | 98 min | 1.10% | B |
| All Delta Air Lines on MIA–LAX | 494 | 77.7% | 80 min | 1.62% | B |
| All carriers on MIA–LAX | 3,251 | 75.2% | 69 min | 0.68% | B+ |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 450 quarter by quarter
DL 450 did not run the same all year. Its best quarter was Jul–Sep 2025 at 86.7% on time and its weakest Jul–Sep 2026 at 68.3%, a swing of 18 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 flights86.7%
- Oct–Dec 202592 flights85.6%
- Jan–Mar 202690 flights82.2%
- Apr–Jun 202691 flights85.6%
- Jul–Sep 202662 flights68.3%
Scale runs 60% to 90%.
By weekday, DL 450 ranged from 78.8% on Sunday to 85.7% on Saturday. With about 52 flights behind each day, a spread of 7 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late DL 450 runs when it is late
DL 450 often beats the schedule: 119 of 360 completed flights, 33%, arrived 15 minutes or more early. The 65 late arrivals split 24 under half an hour, 19 between 30 and 60 minutes, and 22 an hour or more.
- 15+ min early119 flights33.1%
- Within 15 min176 flights48.9%
- 15–29 min late24 flights6.7%
- 30–59 min late19 flights5.3%
- 1–2 hours late11 flights3.1%
- 2+ hours late11 flights3.1%
Scale runs 0% to 100%.
Share of 360 completed flights by arrival against schedule.
17 of 61 late departures made up the time and arrived on time, 28% of them. In the other direction, 21 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 LAX.
The worst days
Worst days for DL 450
The latest arrival of the period was on 27 April 2026, 12 hours 4 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. On three of the five worst days the largest share was filed as carrier-caused (crew, maintenance, fuelling, baggage).
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 27 April 2026 | 12 hours 4 minutes | Late-arriving aircraft |
| 14 February 2026 | 11 hours 41 minutes | Late-arriving aircraft |
| 20 January 2026 | 10 hours 59 minutes | Carrier |
| 29 January 2026 | 10 hours 5 minutes | Carrier |
| 16 July 2026 | 7 hours 8 minutes | Carrier |
Delay causes
Why DL 450 runs late
Late-arriving aircraft accounts for 44% of the 6,354 delay minutes carriers reported here, and the remaining four split what is left.
- 44%Late-arriving aircraft
- 41%Carrier
- 12%National Airspace System
- 3%Extreme weather
44% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 6,354 reported delay minutes here, that single category outweighs weather by 16 to one. The split is drawn from 6,354 delay minutes reported on DL 450.
Cancellations sit at 1.10% against a national 1.89%, which is ordinary. Diversions add another 0.27%.
Connections and routes
What a delay on this flight costs
6.1% 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 an hour and a half, 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.
Every one of the 365 flights under DL 450 in the data flew MIA to LAX. The number was not reused on any other city pair, which makes this a clean record of one route.
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 450
For a booking, read DL 450 as 81.9% on time with 1.10% cancelled over 365 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- MIA to LAX, every carrier and departure
- LAX to MIA, the return direction
- Miami International (MIA) delay statistics
- Los Angeles International (LAX) 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
- Why the first flight of the morning is statistically safest
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.