Flight number record
DL 510
Delta Air Lines · Las Vegas to New York
- Route
- LAS → JFK
- Departs
- 07:00
- Flights
- 349
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 510, check with Delta Air Lines.
DL 510 earns an A. Nearly every flight arrives inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 17 points better than the national rate of 77.3%. When something does go wrong the average delay runs about an hour. That rests on 349 flights, with a median arrival 16 minutes early.
Set against the rest of the country, DL 510's record is 17 points better than the US average of 77.3%. That gap is worth roughly 165 fewer late arrivals for every thousand flights.
Key figures
On time
93.8%
Arrivals under 15 minutes late, of 337 completed flights
Avg delay
67 min
Across delayed arrivals only, not all flights
Cancelled
2.29%
National rate is 1.89%
1 hour+ late
2.7%
National rate is 8.3%
These figures cover 349 flights between September 2025 and August 2026. The median arrival is 16 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 510 flies
DL 510 flies LAS to JFK without a single fixed slot. Its most common scheduled departure was 07:00, used on 153 of 349 flights, with 07:10 (64 flights) and 07:05 (57 flights) next.
- Departs 07:00153 flights43.8%
- Departs 07:1064 flights18.3%
- Departs 07:0557 flights16.3%
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 510 runs 5 points better at 93.8%. 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 510 next to LAS to JFK
Every carrier on LAS to JFK combined arrived on time 80.0% of the time across 3,717 flights, so DL 510 is 14 points ahead of it. Delta flew 1,676 flights on the same city pair under all its flight numbers, including this one, and those ran 82.9% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight beats by 13 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 510thin sample | 349 | 93.8% | 67 min | 2.29% | A |
| All Delta Air Lines on LAS–JFK | 1,676 | 82.9% | 73 min | 2.80% | B |
| All carriers on LAS–JFK | 3,717 | 80.0% | 85 min | 2.96% | B |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 510 quarter by quarter
DL 510 did not run the same all year. Its best quarter was Apr–Jun 2026 at 96.7% on time and its weakest Jul–Sep 2026 at 82.5%, a swing of 14 points on roughly 70 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 202580 flights96.2%
- Jan–Mar 202686 flights96.3%
- Apr–Jun 202691 flights96.7%
- Jul–Sep 202662 flights82.5%
Scale runs 75% to 100%.
By weekday, DL 510 ranged from 89.6% on Monday to 98.0% on Saturday. With about 50 flights behind each day, a spread of 8 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late DL 510 runs when it is late
DL 510 often beats the schedule: 187 of 337 completed flights, 55%, arrived 15 minutes or more early. The 21 late arrivals split 7 under half an hour, 5 between 30 and 60 minutes, and 9 an hour or more.
- 15+ min early187 flights55.5%
- Within 15 min129 flights38.3%
- 15–29 min late7 flights2.1%
- 30–59 min late5 flights1.5%
- 1–2 hours late5 flights1.5%
- 2+ hours late4 flights1.2%
Scale runs 0% to 100%.
Share of 337 completed flights by arrival against schedule.
Only 17 of 337 completed flights left 15 minutes late or more, too few to say how often the time is made up.
The worst days
Worst days for DL 510
The latest arrival of the period was on 14 December 2025, 3 hours 12 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 |
|---|---|---|
| 14 December 2025 | 3 hours 12 minutes | National Airspace System |
| 8 February 2026 | 2 hours 31 minutes | Carrier |
| 2 August 2026 | 2 hours 6 minutes | Carrier |
| 22 June 2026 | 2 hours 3 minutes | Carrier |
| 26 January 2026 | 1 hour 50 minutes | National Airspace System |
Delay causes
Why DL 510 runs late
National Airspace System accounts for 54% of the 1,399 delay minutes carriers reported here, and the remaining four split what is left.
- 54%National Airspace System
- 46%Carrier
The largest share of delay minutes, 46%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 650 of the 1,399 delay minutes reported here. The split is drawn from 1,399 delay minutes reported on DL 510.
Cancellations sit at 2.29% against a national 1.89%, which is ordinary. Diversions add another 1.15%.
Connections and routes
What a delay on this flight costs
Badly late arrivals are rare here: only 2.7% 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 2,248 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 DTW to MEM (16), but none flew often enough under DL 510 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to LAS to JFK only.
One caution: this is a thin sample. 349 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 510
For a booking, read DL 510 as 93.8% on time with 2.29% cancelled over 349 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- LAS to JFK, every carrier and departure
- JFK to LAS, the return direction
- Delta Air Lines 333 on the same route84.4%
- JetBlue Airways 948 on the same route70.1%
- JetBlue Airways 348 on the same route70.0%
- Delta Air Lines 795 on the same route75.5%
- Harry Reid International (LAS) delay statistics
- John F. Kennedy International (JFK) 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
- Late aircraft, weather, or the airline: what actually causes US flight delays
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.