Flight number record
DL 1200
Delta Air Lines · Rochester to Atlanta
- Route
- ROC → ATL
- Departs
- 06:00
- Flights
- 365
- Period
- July 2025 to June 2026
Historical statistics for July 2025 to June 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 77.6%. When something does go wrong the average delay runs an hour and a half. That rests on 365 flights, with a median arrival 10 minutes early.
Set against the rest of the country, DL 1200's record is 8 points better than the US average of 77.6%. That gap is worth roughly 84 fewer late arrivals for every thousand flights.
Key figures
On time
86.0%
Arrivals under 15 minutes late, of 350 completed flights
Avg delay
83 min
Across delayed arrivals only, not all flights
Cancelled
3.84%
National rate is 1.81%
1 hour+ late
3.4%
National rate is 8.1%
These figures cover 365 flights between July 2025 and June 2026. The median arrival is 10 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.
Schedule
When DL 1200 flies
DL 1200 is scheduled to leave Rochester (ROC) at 06:00 local time and reach Atlanta (ATL) at 08:10. That slot held for 317 of the 365 scheduled departures in the data, so the figures below describe one steady operation rather than a number that moved around the clock.
- Departs 06:00317 flights86.8%
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 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 3 points worse at 86.0%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
Against the route
DL 1200 next to ROC to ATL
Every carrier on ROC to ATL combined arrived on time 81.1% of the time across 1,040 flights, so DL 1200 is 5 points ahead of it. Across its whole network Delta Air Lines managed 81.6%, which this flight beats by 4 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 1200 | 365 | 86.0% | 83 min | 3.84% | A− |
| All Delta Air Lines on ROC–ATL | 1,040 | 81.1% | 72 min | 2.60% | B |
| All carriers on ROC–ATL | 1,040 | 81.1% | 72 min | 2.60% | B |
| Delta Air Lines, whole network | 1,038,570 | 81.6% | 71 min | 1.62% | 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 93.1% on time and its weakest Oct–Dec 2025 at 76.4%, a swing of 17 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 202592 flights93.1%
- Oct–Dec 202592 flights76.4%
- Jan–Mar 202690 flights82.4%
- Apr–Jun 202691 flights92.1%
Scale runs 70% to 100%. Rows with fewer than 30 flights show a dash.
By weekday, DL 1200 did best on Friday at 94.1% on time and worst on Wednesday at 80.4%. Each day rests on about 52 flights, so a gap of 14 points is worth noticing but could still narrow in another year.
Delay causes
Why DL 1200 runs late
One category carries most of the weight here. Carrier accounts for 65% of the 4,068 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.
- 65%Carrier
- 20%National Airspace System
- 15%Extreme weather
Extreme weather accounts for 15% 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 2.5 times the usual weather exposure. The split is drawn from 4,068 delay minutes reported on DL 1200.
Cancellations run at 3.84%, against 1.81% nationally. That is about one flight in 25 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 8.1% 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. 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.
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: 3.84% 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 route80.1%
- Delta Air Lines 2047 on the same route76.5%
- 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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.