Flight number record
DL 776
Delta Air Lines · Boston to Miami
- Route
- BOS → MIA
- Departs
- 15:50
- Flights
- 362
- Period
- July 2025 to June 2026
Historical statistics for July 2025 to June 2026, not live status. For today’s DL 776, check with Delta Air Lines.
DL 776 draws a D. Roughly one flight in three 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 362 flights, with a median arrival 4 minutes late.
The national on-time rate over the same period is 77.6%, so DL 776 runs 16 points behind the country as a whole. Across a thousand flights that is about 160 extra late arrivals.
Key figures
On time
61.6%
Arrivals under 15 minutes late, of 354 completed flights
Avg delay
72 min
Across delayed arrivals only, not all flights
Cancelled
1.93%
National rate is 1.81%
1 hour+ late
15.5%
National rate is 8.1%
These figures cover 362 flights between July 2025 and June 2026. Beyond the headline rate, 15.5% 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 776 flies
DL 776 flies BOS to MIA without a single fixed slot. Its most common scheduled departure was 15:50, used on 71 of 362 flights, with 15:20 (48 flights) and 15:24 (46 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.
- Departs 15:5071 flights19.6%
- Departs 15:2048 flights13.3%
- Departs 15:2446 flights12.7%
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 15:50 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 72.4%, and DL 776 runs 11 points worse at 61.6%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
Against the route
DL 776 next to BOS to MIA
Every carrier on BOS to MIA combined arrived on time 77.7% of the time across 3,417 flights, so DL 776 is 16 points behind it. Delta flew 890 flights on the same city pair under all its flight numbers, including this one, and those ran 72.1% on time. Across its whole network Delta Air Lines managed 81.6%, which this flight trails by 20 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 776thin sample | 362 | 61.6% | 72 min | 1.93% | D |
| All Delta Air Lines on BOS–MIA | 890 | 72.1% | 76 min | 2.70% | C |
| All carriers on BOS–MIA | 3,417 | 77.7% | 75 min | 2.25% | B |
| Delta Air Lines, whole network | 1,038,570 | 81.6% | 71 min | 1.62% | B |
Across the year
DL 776 quarter by quarter
DL 776 did not run the same all year. Its best quarter was Apr–Jun 2026 at 71.4% on time and its weakest Oct–Dec 2025 at 52.8%, a swing of 19 points on roughly 91 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 202590 flights58.6%
- Oct–Dec 202591 flights52.8%
- Jan–Mar 202690 flights63.2%
- Apr–Jun 202691 flights71.4%
Scale runs 45% to 75%. Rows with fewer than 30 flights show a dash.
By weekday, DL 776 did best on Friday at 71.4% on time and worst on Sunday at 42.0%. Each day rests on about 52 flights, so a gap of 29 points is worth noticing but could still narrow in another year.
Delay causes
Why DL 776 runs late
One category carries most of the weight here. Late-arriving aircraft accounts for 42% of the 9,790 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.
- 42%Late-arriving aircraft
- 30%National Airspace System
- 27%Carrier
- 1%Extreme weather
42% 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 9,790 reported delay minutes here, that single category outweighs weather by 42 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 9,790 delay minutes reported on DL 776.
Cancellations sit at 1.93% against a national 1.81%, which is ordinary. Diversions add another 0.28%.
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. 15.5% 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 1,258 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.
The same number turns up on one other city pair in the data, including MIA to BOS (179), but none flew often enough under DL 776 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to BOS to MIA only.
One caution: this is a thin sample. 362 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 776
For a booking, DL 776 is a flight to put a long connection behind. 15.5% 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
- BOS to MIA, every carrier and departure
- MIA to BOS, the return direction
- Delta Air Lines 1399 on the same route84.9%
- American Airlines 1259 on the same route87.9%
- American Airlines 2980 on the same route93.9%
- Boston Logan International (BOS) 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
- 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.