Flight number record
DL 385
Delta Air Lines · Boston to Atlanta
- Route
- BOS → ATL
- Departs
- 09:05
- Flights
- 347
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 385, check with Delta Air Lines.
DL 385 earns an A. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 9 points better than the national rate of 77.3%. When something does go wrong the average delay runs a little over an hour. That rests on 347 flights, with a median arrival 11 minutes early.
Set against the rest of the country, DL 385's record is 9 points better than the US average of 77.3%. That gap is worth roughly 91 fewer late arrivals for every thousand flights.
Key figures
On time
86.4%
Arrivals under 15 minutes late, of 338 completed flights
Avg delay
79 min
Across delayed arrivals only, not all flights
Cancelled
2.59%
National rate is 1.89%
1 hour+ late
5.9%
National rate is 8.3%
These figures cover 347 flights between September 2025 and August 2026. The median arrival is 11 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.
Fare search by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Schedule
When DL 385 flies
DL 385 flies BOS to ATL without a single fixed slot. Its most common scheduled departure was 09:05, used on 55 of 347 flights, with 10:15 (52 flights) and 17:25 (39 flights) next.
- Departs 09:0555 flights15.9%
- Departs 10:1552 flights15.0%
- Departs 17:2539 flights11.2%
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 385 runs 3 points better at 86.4%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
Timetable by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Against the route
DL 385 next to BOS to ATL
Every carrier on BOS to ATL combined arrived on time 76.8% of the time across 5,050 flights, so DL 385 is 10 points ahead of it. Delta flew 3,726 flights on the same city pair under all its flight numbers, including this one, and those ran 80.8% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight beats by 5 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 385thin sample | 347 | 86.4% | 79 min | 2.59% | A |
| All Delta Air Lines on BOS–ATL | 3,726 | 80.8% | 75 min | 1.85% | B |
| All carriers on BOS–ATL | 5,050 | 76.8% | 72 min | 2.24% | B |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 385 quarter by quarter
Quarter by quarter DL 385 held fairly steady: 90.0% in Jul–Sep 2025, 84.5% in Oct–Dec 2025, 84.9% in Jan–Mar 2026, 91.0% in Apr–Jun 2026 and 82.3% in Jul–Sep 2026. A spread of 9 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Jul–Sep 202530 flights90.0%
- Oct–Dec 202587 flights84.5%
- Jan–Mar 202678 flights84.9%
- Apr–Jun 202690 flights91.0%
- Jul–Sep 202662 flights82.3%
Scale runs 75% to 95%.
By weekday, DL 385 did best on Wednesday at 96.2% on time and worst on Tuesday at 80.4%. Each day rests on about 50 flights, so a gap of 16 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 385 runs when it is late
DL 385 often beats the schedule: 132 of 338 completed flights, 39%, arrived 15 minutes or more early. The 46 late arrivals split 14 under half an hour, 12 between 30 and 60 minutes, and 20 an hour or more.
- 15+ min early132 flights39.1%
- Within 15 min160 flights47.3%
- 15–29 min late14 flights4.1%
- 30–59 min late12 flights3.6%
- 1–2 hours late12 flights3.6%
- 2+ hours late8 flights2.4%
Scale runs 0% to 100%.
Share of 338 completed flights by arrival against schedule.
13 of 50 late departures made up the time and arrived on time, 26% of them. 9 flights left on time and still arrived late.
The worst days
Worst days for DL 385
The latest arrival of the period was on 8 December 2025, 7 hours 20 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 |
|---|---|---|
| 8 December 2025 | 7 hours 20 minutes | Late-arriving aircraft |
| 9 July 2026 | 5 hours 27 minutes | Carrier |
| 26 January 2026 | 4 hours 58 minutes | Late-arriving aircraft |
| 28 October 2025 | 2 hours 52 minutes | Carrier |
| 4 September 2025 | 2 hours 38 minutes | Carrier |
Delay causes
Why DL 385 runs late
Carrier accounts for 45% of the 3,654 delay minutes carriers reported here, and the remaining four split what is left.
- 45%Carrier
- 41%Late-arriving aircraft
- 14%National Airspace System
41% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 3,654 reported delay minutes here, that single category outweighs weather by 41 to one. The split is drawn from 3,654 delay minutes reported on DL 385.
Cancellations run at 2.59%, against 1.89% nationally. That is about one flight in 40 cancelled outright. A cancelled flight is invisible in every on-time figure on this page, so the punctuality numbers above describe only the flights that actually operated.
Connections and routes
What a delay on this flight costs
5.9% 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 a little over an hour, which a normal layover absorbs.
The 946 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.
Every one of the 347 flights under DL 385 in the data flew BOS to ATL. 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. 347 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 385
For a booking, the cancellation rate is the figure to plan around on DL 385: 2.59% of its 347 scheduled flights did not operate. A late arrival costs a little over an hour, but a cancellation costs the day, so leave a later option open.
Related
Where to go next
- BOS to ATL, every carrier and departure
- ATL to BOS, the return direction
- Delta Air Lines 695 on the same route86.0%
- Delta Air Lines 322 on the same route78.0%
- Delta Air Lines 973 on the same route79.1%
- Delta Air Lines 456 on the same route89.4%
- Delta Air Lines 923 on the same route87.2%
- Delta Air Lines 2464 on the same route74.9%
- Boston Logan International (BOS) 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, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.