Flight number record
DL 515
Delta Air Lines · Los Angeles to Atlanta
- Route
- LAX → ATL
- Departs
- 07:00
- Flights
- 365
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 515, check with Delta Air Lines.
DL 515 lands a B, 6 points better than the national rate of 77.3%. About one flight in six arrives 15 minutes late or worse, and those flights are late by about an hour on average. That rests on 365 flights, with a median arrival 5 minutes early.
Set against the rest of the country, DL 515's record is 6 points better than the US average of 77.3%. That gap is worth roughly 56 fewer late arrivals for every thousand flights.
Key figures
On time
82.9%
Arrivals under 15 minutes late, of 356 completed flights
Avg delay
65 min
Across delayed arrivals only, not all flights
Cancelled
1.64%
National rate is 1.89%
1 hour+ late
2.5%
National rate is 8.3%
These figures cover 365 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 515 flies
DL 515 flies LAX to ATL without a single fixed slot. Its most common scheduled departure was 07:00, used on 129 of 365 flights, with 07:15 (128 flights) and 08:25 (52 flights) next.
- Departs 07:00129 flights35.3%
- Departs 07:15128 flights35.1%
- Departs 08:2552 flights14.2%
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 07:00 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and DL 515 runs 6 points worse at 82.9%. 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 515 next to LAX to ATL
Every carrier on LAX to ATL combined arrived on time 78.6% of the time across 4,843 flights, so DL 515 is 4 points ahead of it. Delta flew 3,811 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 2 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 515 | 365 | 82.9% | 65 min | 1.64% | B |
| All Delta Air Lines on LAX–ATL | 3,811 | 80.8% | 66 min | 0.84% | B+ |
| All carriers on LAX–ATL | 4,843 | 78.6% | 68 min | 0.89% | B+ |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 515 quarter by quarter
DL 515 did not run the same all year. Its best quarter was Jul–Sep 2025 at 93.3% on time and its weakest Jan–Mar 2026 at 65.9%, a swing of 27 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 flights87.6%
- Jan–Mar 202690 flights65.9%
- Apr–Jun 202691 flights85.7%
- Jul–Sep 202662 flights91.4%
Scale runs 55% to 100%.
By weekday, DL 515 did best on Monday at 88.2% on time and worst on Saturday at 72.0%. 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 515 runs when it is late
Most of the lateness is short. 34 of the 61 late arrivals were under half an hour behind, and 9 reached an hour or more.
- 15+ min early70 flights19.7%
- Within 15 min225 flights63.2%
- 15–29 min late34 flights9.6%
- 30–59 min late18 flights5.1%
- 1–2 hours late2 flights0.6%
- 2+ hours late7 flights2.0%
Scale runs 0% to 100%.
Share of 356 completed flights by arrival against schedule.
12 of 48 late departures made up the time and arrived on time, 25% of them. In the other direction, 25 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 515
The latest arrival of the period was on 11 October 2025, 11 hours 27 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on four of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 11 October 2025 | 11 hours 27 minutes | Carrier |
| 14 October 2025 | 8 hours 14 minutes | Carrier |
| 10 September 2025 | 7 hours 39 minutes | Carrier |
| 24 January 2026 | 4 hours 10 minutes | Carrier |
| 7 September 2025 | 3 hours 19 minutes | Late-arriving aircraft |
Delay causes
Why DL 515 runs late
Carrier accounts for 72% of the 3,965 delay minutes carriers reported here, and the remaining four split what is left.
- 72%Carrier
- 21%National Airspace System
- 7%Late-arriving aircraft
- 1%Extreme weather
The largest share of delay minutes, 72%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 2,865 of the 3,965 delay minutes reported here. The split is drawn from 3,965 delay minutes reported on DL 515.
Cancellations sit at 1.64% against a national 1.89%, which is ordinary. Diversions add another 0.82%.
Connections and routes
What a delay on this flight costs
Badly late arrivals are rare here: only 2.5% 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.
At 1,947 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.
Every one of the 365 flights under DL 515 in the data flew LAX 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 515
For a booking, read DL 515 as 82.9% on time with 1.64% cancelled over 365 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- LAX to ATL, every carrier and departure
- ATL to LAX, the return direction
- Delta Air Lines 390 on the same route88.5%
- Delta Air Lines 782 on the same route79.8%
- Delta Air Lines 783 on the same route80.2%
- Delta Air Lines 899 on the same route79.5%
- Delta Air Lines 446 on the same route84.7%
- Delta Air Lines 528 on the same route84.7%
- Los Angeles International (LAX) 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
- 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.