Flight number record
DL 712
Delta Air Lines · Atlanta to San Diego
- Route
- ATL → SAN
- Departs
- 16:59
- Flights
- 320
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 712, check with Delta Air Lines.
DL 712 lands a B+, 3 points better than the national rate of 77.3%. About one flight in five arrives 15 minutes late or worse, and those flights are late by about 50 minutes on average. That rests on 320 flights, with a median arrival 5 minutes early.
Key figures
On time
80.1%
Arrivals under 15 minutes late, of 317 completed flights
Avg delay
50 min
Across delayed arrivals only, not all flights
Cancelled
0.31%
National rate is 1.89%
1 hour+ late
6.0%
National rate is 8.3%
These figures cover 320 flights between September 2025 and August 2026. The median arrival is 5 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 712 flies
DL 712 flies ATL to SAN without a single fixed slot. Its most common scheduled departure was 16:59, used on 75 of 320 flights.
- Departs 16:5975 flights23.4%
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 16:59 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 71.9%, and DL 712 runs 8 points better at 80.1%. 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 712 next to ATL to SAN
Every carrier on ATL to SAN combined arrived on time 78.2% of the time across 2,353 flights, so DL 712 is 2 points ahead of it. Delta flew 2,173 flights on the same city pair under all its flight numbers, including this one, and those ran 77.8% on time. Across its whole network Delta Air Lines managed 81.1%, close to this flight's figure.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 712thin sample | 320 | 80.1% | 50 min | 0.31% | B+ |
| All Delta Air Lines on ATL–SAN | 2,173 | 77.8% | 47 min | 0.69% | B+ |
| All carriers on ATL–SAN | 2,353 | 78.2% | 46 min | 0.64% | B+ |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 712 quarter by quarter
DL 712 did not run the same all year. Its best quarter was Jul–Sep 2026 at 90.2% on time and its weakest Apr–Jun 2026 at 74.7%, a swing of 16 points on roughly 80 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 202525 flights—
- Oct–Dec 202552 flights76.9%
- Jan–Mar 202690 flights82.0%
- Apr–Jun 202691 flights74.7%
- Jul–Sep 202662 flights90.2%
Scale runs 65% to 95%. Rows with fewer than 30 flights show a dash.
By weekday, DL 712 did best on Wednesday at 90.5% on time and worst on Friday at 71.1%. Each day rests on about 46 flights, so a gap of 19 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 712 runs when it is late
The 63 late arrivals split 26 under half an hour, 18 between 30 and 60 minutes, and 19 an hour or more.
- 15+ min early79 flights24.9%
- Within 15 min175 flights55.2%
- 15–29 min late26 flights8.2%
- 30–59 min late18 flights5.7%
- 1–2 hours late16 flights5.0%
- 2+ hours late3 flights0.9%
Scale runs 0% to 100%.
Share of 317 completed flights by arrival against schedule.
16 of 66 late departures made up the time and arrived on time, 24% of them. 13 flights left on time and still arrived late.
The worst days
Worst days for DL 712
The latest arrival of the period was on 9 November 2025, 4 hours 5 minutes behind schedule; most of its delay minutes were filed as national airspace system delay. 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 |
|---|---|---|
| 9 November 2025 | 4 hours 5 minutes | National Airspace System |
| 17 July 2026 | 2 hours 50 minutes | Carrier |
| 1 January 2026 | 2 hours 46 minutes | Late-arriving aircraft |
| 1 August 2026 | 1 hour 57 minutes | Carrier |
| 7 March 2026 | 1 hour 53 minutes | Carrier |
Delay causes
Why DL 712 runs late
Carrier accounts for 44% of the 3,169 delay minutes carriers reported here, and the remaining four split what is left.
- 44%Carrier
- 30%National Airspace System
- 24%Late-arriving aircraft
- 2%Extreme weather
The largest share of delay minutes, 44%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 1,392 of the 3,169 delay minutes reported here. The split is drawn from 3,169 delay minutes reported on DL 712.
Cancellations are rare at 0.31%, below the national 1.89% and low enough to earn the plus on the grade. Roughly one flight in 100 is called off; the risk here is arriving late, not not arriving.
Connections and routes
What a delay on this flight costs
6.0% 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 about 50 minutes, which a normal layover absorbs.
At 1,892 miles this is transcontinental flying, and long routes get a quiet structural advantage. Scheduled block time on a flight this length carries more padding in absolute minutes, so a twenty-minute late departure often still becomes an on-time arrival. Read the on-time rate here as slightly flattering next to a short-haul route with the same operational quality.
The same number turns up on one other city pair in the data, including SAN to ATL (86), but none flew often enough under DL 712 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to ATL to SAN only.
One caution: this is a thin sample. 320 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 712
For a booking, read DL 712 as 80.1% on time with 0.31% cancelled over 320 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- ATL to SAN, every carrier and departure
- SAN to ATL, the return direction
- Delta Air Lines 725 on the same route87.5%
- Delta Air Lines 896 on the same route76.6%
- Delta Air Lines 843 on the same route77.2%
- Delta Air Lines 894 on the same route78.0%
- Hartsfield-Jackson Atlanta International (ATL) delay statistics
- San Diego International (SAN) 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
- The best time of day to fly, according to 7.05 million flight records
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.