Flight number record
DL 1386
Delta Air Lines · Miami to Atlanta
- Route
- MIA → ATL
- Departs
- 18:15
- Flights
- 339
- Period
- July 2025 to June 2026
Historical statistics for July 2025 to June 2026, not live status. For today’s DL 1386, check with Delta Air Lines.
DL 1386 draws a D. Roughly one flight in two arrives at least 15 minutes late, and the typical late arrival is a little over an hour behind schedule. Build slack into anything you connect to. That rests on 339 flights, with a median arrival 4 minutes late.
The national on-time rate over the same period is 77.6%, so DL 1386 runs 19 points behind the country as a whole. Across a thousand flights that is about 192 extra late arrivals.
Key figures
On time
58.4%
Arrivals under 15 minutes late, of 334 completed flights
Avg delay
76 min
Across delayed arrivals only, not all flights
Cancelled
1.47%
National rate is 1.81%
1 hour+ late
16.8%
National rate is 8.1%
These figures cover 339 flights between July 2025 and June 2026. Beyond the headline rate, 16.8% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.
Schedule
When DL 1386 flies
DL 1386 flies MIA to ATL without a single fixed slot. Its most common scheduled departure was 18:15, used on 60 of 339 flights, with 18:23 (36 flights) and 17:58 (36 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.
- Departs 18:1560 flights17.7%
- Departs 18:2336 flights10.6%
- Departs 17:5836 flights10.6%
Scale runs 0% to 100%. Rows with fewer than 30 flights show a dash.
Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.
A 18:15 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.2%, and DL 1386 runs 10 points worse at 58.4%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
Against the route
DL 1386 next to MIA to ATL
Every carrier on MIA to ATL combined arrived on time 73.7% of the time across 6,223 flights, so DL 1386 is 15 points behind it. Delta flew 3,300 flights on the same city pair under all its flight numbers, including this one, and those ran 76.7% on time. Across its whole network Delta Air Lines managed 81.6%, which this flight trails by 23 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 1386thin sample | 339 | 58.4% | 76 min | 1.47% | D |
| All Delta Air Lines on MIA–ATL | 3,300 | 76.7% | 83 min | 1.39% | B |
| All carriers on MIA–ATL | 6,223 | 73.7% | 80 min | 1.41% | C |
| Delta Air Lines, whole network | 1,038,570 | 81.6% | 71 min | 1.62% | B |
Across the year
DL 1386 quarter by quarter
DL 1386 did not run the same all year. Its best quarter was Apr–Jun 2026 at 63.7% on time and its weakest Jul–Sep 2025 at 52.4%, a swing of 11 points on roughly 85 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 202582 flights52.4%
- Oct–Dec 202587 flights58.1%
- Jan–Mar 202679 flights58.7%
- Apr–Jun 202691 flights63.7%
Scale runs 45% to 70%. Rows with fewer than 30 flights show a dash.
By weekday, DL 1386 did best on Wednesday at 79.2% on time and worst on Sunday at 36.2%. Each day rests on about 48 flights, so a gap of 43 points is worth noticing but could still narrow in another year.
Delay causes
Why DL 1386 runs late
One category carries most of the weight here. Late-arriving aircraft accounts for 56% of the 11,000 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.
- 56%Late-arriving aircraft
- 27%Carrier
- 16%National Airspace System
- 1%Extreme weather
- 0%Security
56% 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 11,000 reported delay minutes here, that single category outweighs weather by 55 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 10,517 delay minutes reported on DL 1386.
Cancellations sit at 1.47% against a national 1.81%, which is ordinary. Diversions add another 0.00%.
Connections and routes
What a delay on this flight costs
For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 16.8% of arrivals land a full hour or more behind schedule, against 8.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum here, and two hours if the onward flight is on a separate ticket.
The 594 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.
DL 1386 is not only a MIA to ATL flight. It also flew ATL to MIA (327 flights, 60.1% on time) often enough to be scored on its own. Airlines attach one number to several legs of an aircraft's day, and each leg keeps its own record here, so check which city pair is on your booking before reading a rate.
One caution: this is a thin sample. 339 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.
| Also flown as | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| ATL to MIAthin sample | 327 | 60.1% | 55 min | 1.22% | D |
What to do with this
Booking DL 1386
For a booking, DL 1386 is a flight to put a long connection behind. 16.8% of its completed flights arrived an hour or more late, which a short layover will not absorb. If the onward flight is on a separate ticket, the risk sits with you.
Related
Where to go next
- MIA to ATL, every carrier and departure
- ATL to MIA, the return direction
- Delta Air Lines 1261 on the same route92.0%
- Delta Air Lines 1510 on the same route78.9%
- Delta Air Lines 1332 on the same route73.9%
- Delta Air Lines 2836 on the same route84.6%
- Delta Air Lines 1211 on the same route92.2%
- Frontier Airlines 4405 on the same route60.5%
- Miami International (MIA) delay statistics
- Hartsfield-Jackson Atlanta International (ATL) 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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.