Flight number record
DL 1200
Delta Air Lines · Rochester to Atlanta
- Route
- ROC → ATL
- Departs
- 06:00
- Flights
- 365
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 1200, check with Delta Air Lines.
DL 1200 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 8 points better than the national rate of 77.3%. When something does go wrong the average delay runs an hour and a half. That rests on 365 flights, with a median arrival 8 minutes early.
Set against the rest of the country, DL 1200's record is 8 points better than the US average of 77.3%. That gap is worth roughly 83 fewer late arrivals for every thousand flights.
Key figures
On time
85.6%
Arrivals under 15 minutes late, of 353 completed flights
Avg delay
90 min
Across delayed arrivals only, not all flights
Cancelled
3.01%
National rate is 1.89%
1 hour+ late
3.4%
National rate is 8.3%
These figures cover 365 flights between September 2025 and August 2026. The median arrival is 8 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 1200 flies
DL 1200 flies ROC to ATL without a single fixed slot. Its most common scheduled departure was 06:00, used on 288 of 365 flights.
- Departs 06:00288 flights78.9%
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 06:00 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and DL 1200 runs 4 points worse at 85.6%. 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 1200 next to ROC to ATL
Every carrier on ROC to ATL combined arrived on time 79.6% of the time across 1,043 flights, so DL 1200 is 6 points ahead of it. 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 1200 | 365 | 85.6% | 90 min | 3.01% | A− |
| All Delta Air Lines on ROC–ATL | 1,043 | 79.6% | 76 min | 2.30% | B |
| All carriers on ROC–ATL | 1,043 | 79.6% | 76 min | 2.30% | B |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 1200 quarter by quarter
DL 1200 did not run the same all year. Its best quarter was Jul–Sep 2025 at 93.3% on time and its weakest Oct–Dec 2025 at 76.4%, a swing of 17 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 flights93.3%
- Oct–Dec 202592 flights76.4%
- Jan–Mar 202690 flights82.4%
- Apr–Jun 202691 flights92.1%
- Jul–Sep 202662 flights90.0%
Scale runs 70% to 100%.
By weekday, DL 1200 did best on Friday at 92.2% on time and worst on Wednesday at 76.5%. Each day rests on about 52 flights, so a gap of 16 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 1200 runs when it is late
DL 1200 often beats the schedule: 126 of 353 completed flights, 36%, arrived 15 minutes or more early. The 51 late arrivals split 24 under half an hour, 15 between 30 and 60 minutes, and 12 an hour or more.
- 15+ min early126 flights35.7%
- Within 15 min176 flights49.9%
- 15–29 min late24 flights6.8%
- 30–59 min late15 flights4.2%
- 1–2 hours late4 flights1.1%
- 2+ hours late8 flights2.3%
Scale runs 0% to 100%.
Share of 353 completed flights by arrival against schedule.
10 of 41 late departures made up the time and arrived on time, 24% of them. In the other direction, 20 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 ATL.
The worst days
Worst days for DL 1200
The latest arrival of the period was on 14 May 2026, 14 hours 32 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). Three of the five worst days fell in February 2026.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 14 May 2026 | 14 hours 32 minutes | Carrier |
| 6 July 2026 | 10 hours 7 minutes | National Airspace System |
| 18 February 2026 | 9 hours 56 minutes | Extreme weather |
| 7 February 2026 | 7 hours 11 minutes | Carrier |
| 1 February 2026 | 3 hours 30 minutes | Carrier |
Delay causes
Why DL 1200 runs late
Carrier accounts for 55% of the 4,599 delay minutes carriers reported here, and the remaining four split what is left.
- 55%Carrier
- 32%National Airspace System
- 14%Extreme weather
Extreme weather accounts for 14% of delay minutes, well above the single-digit share typical across the system. Weather delays are lumpy: they arrive as whole bad days rather than as a steady drag, so the quarterly figures above are the more useful view of the risk. The national share is 6%, so this operation carries roughly 2.3 times the usual weather exposure. The split is drawn from 4,599 delay minutes reported on DL 1200.
Cancellations run at 3.01%, against 1.89% nationally. That is roughly one flight in 30 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
Badly late arrivals are rare here: only 3.4% land an hour or more behind schedule, against 8.3% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.
The 749 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 365 flights under DL 1200 in the data flew ROC 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. 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 1200
For a booking, the cancellation rate is the figure to plan around on DL 1200: 3.01% of its 365 scheduled flights did not operate. A late arrival costs an hour and a half, but a cancellation costs the day, so leave a later option open.
Related
Where to go next
- ROC to ATL, every carrier and departure
- ATL to ROC, the return direction
- Delta Air Lines 2511 on the same route76.7%
- Delta Air Lines 2047 on the same route76.2%
- 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
- What a cancellation rate actually tells you (and what it hides)
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.