Flight number record
DL 776
Delta Air Lines · Boston to Miami
- Route
- BOS → MIA
- Departs
- 15:20
- Flights
- 364
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 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 364 flights, with a median arrival 3 minutes late.
The national on-time rate over the same period is 77.3%, so DL 776 runs 14 points behind the country as a whole. Across a thousand flights that is about 142 extra late arrivals.
Key figures
On time
63.1%
Arrivals under 15 minutes late, of 358 completed flights
Avg delay
72 min
Across delayed arrivals only, not all flights
Cancelled
1.65%
National rate is 1.89%
1 hour+ late
13.4%
National rate is 8.3%
These figures cover 364 flights between September 2025 and August 2026. Beyond the headline rate, 13.4% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When DL 776 flies
DL 776 flies BOS to MIA without a single fixed slot. Its most common scheduled departure was 15:20, used on 77 of 364 flights, with 15:15 (58 flights) and 15:50 (51 flights) next.
- Departs 15:2077 flights21.2%
- Departs 15:1558 flights15.9%
- Departs 15:5051 flights14.0%
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 15:20 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 71.9%, and DL 776 runs 9 points worse at 63.1%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
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Against the route
DL 776 next to BOS to MIA
Every carrier on BOS to MIA combined arrived on time 78.0% of the time across 3,368 flights, so DL 776 is 15 points behind it. Delta flew 892 flights on the same city pair under all its flight numbers, including this one, and those ran 72.4% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight trails by 18 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 776thin sample | 364 | 63.1% | 72 min | 1.65% | D |
| All Delta Air Lines on BOS–MIA | 892 | 72.4% | 78 min | 2.58% | C |
| All carriers on BOS–MIA | 3,368 | 78.0% | 78 min | 2.17% | B |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | 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 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 flights53.3%
- Oct–Dec 202591 flights52.8%
- Jan–Mar 202690 flights63.2%
- Apr–Jun 202691 flights71.4%
- Jul–Sep 202662 flights70.5%
Scale runs 45% to 75%.
By weekday, DL 776 did best on Friday at 74.0% on time and worst on Sunday at 49.0%. Each day rests on about 52 flights, so a gap of 25 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 776 runs when it is late
The 132 late arrivals split 37 under half an hour, 47 between 30 and 60 minutes, and 48 an hour or more.
- 15+ min early84 flights23.5%
- Within 15 min142 flights39.7%
- 15–29 min late37 flights10.3%
- 30–59 min late47 flights13.1%
- 1–2 hours late25 flights7.0%
- 2+ hours late23 flights6.4%
Scale runs 0% to 100%.
Share of 358 completed flights by arrival against schedule.
18 of 110 late departures made up the time and arrived on time, 16% of them. In the other direction, 40 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 776
The latest arrival of the period was on 21 April 2026, 5 hours 28 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The five worst days are spread across April, July, September and October, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 21 April 2026 | 5 hours 28 minutes | Late-arriving aircraft |
| 6 July 2026 | 5 hours 28 minutes | Carrier |
| 6 September 2025 | 5 hours 19 minutes | National Airspace System |
| 14 October 2025 | 4 hours 49 minutes | Late-arriving aircraft |
| 11 April 2026 | 4 hours 49 minutes | Carrier |
Delay causes
Why DL 776 runs late
Late-arriving aircraft accounts for 43% of the 9,500 delay minutes carriers reported here, and the remaining four split what is left.
- 43%Late-arriving aircraft
- 29%National Airspace System
- 28%Carrier
- 1%Extreme weather
43% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 9,500 reported delay minutes here, that single category outweighs weather by 43 to one. The split is drawn from 9,500 delay minutes reported on DL 776.
Cancellations sit at 1.65% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and routes
What a delay on this flight costs
13.4% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection 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.
The same number turns up on one other city pair in the data, including MIA to BOS (184), 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. 364 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. 13.4% 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 route84.0%
- American Airlines 1259 on the same route88.6%
- American Airlines 2980 on the same route92.7%
- 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, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.