Flight number record
DL 3015
Delta Air Lines · Knoxville to Atlanta
- Route
- TYS → ATL
- Departs
- 05:40
- Flights
- 343
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 3015, check with Delta Air Lines.
DL 3015 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 2.6 hours. That rests on 343 flights, with a median arrival 17 minutes early.
Set against the rest of the country, DL 3015's record is 17 points better than the US average of 77.3%. That gap is worth roughly 174 fewer late arrivals for every thousand flights.
Key figures
On time
94.7%
Arrivals under 15 minutes late, of 338 completed flights
Avg delay
154 min
Across delayed arrivals only, not all flights
Cancelled
1.46%
National rate is 1.89%
1 hour+ late
2.4%
National rate is 8.3%
These figures cover 343 flights between September 2025 and August 2026. The median arrival is 17 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 3015 flies
DL 3015 flies TYS to ATL without a single fixed slot. Its most common scheduled departure was 05:40, used on 217 of 343 flights, with 05:35 (42 flights) and 05:45 (35 flights) next.
- Departs 05:40217 flights63.3%
- Departs 05:3542 flights12.2%
- Departs 05:4535 flights10.2%
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 05:40 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and DL 3015 runs 5 points better at 94.7%. 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 3015 next to TYS to ATL
Every carrier on TYS to ATL combined arrived on time 87.8% of the time across 1,728 flights, so DL 3015 is 7 points ahead of it. Delta flew 1,727 flights on the same city pair under all its flight numbers, including this one, and those ran 87.9% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight beats by 14 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 3015thin sample | 343 | 94.7% | 154 min | 1.46% | A |
| All Delta Air Lines on TYS–ATL | 1,727 | 87.9% | 82 min | 1.80% | A |
| All carriers on TYS–ATL | 1,728 | 87.8% | 81 min | 1.79% | A |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 3015 quarter by quarter
DL 3015 did not run the same all year. Its best quarter was Apr–Jun 2026 at 98.9% on time and its weakest Jan–Mar 2026 at 88.8%, a swing of 10 points on roughly 69 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 flights96.7%
- Oct–Dec 202577 flights93.3%
- Jan–Mar 202683 flights88.8%
- Apr–Jun 202691 flights98.9%
- Jul–Sep 202662 flights96.8%
Scale runs 80% to 100%.
By weekday, DL 3015 ranged from 90.0% on Monday to 100.0% on Friday. With about 49 flights behind each day, a spread of 10 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late DL 3015 runs when it is late
DL 3015 often beats the schedule: 212 of 338 completed flights, 63%, arrived 15 minutes or more early. The 18 late arrivals split 3 under half an hour, 7 between 30 and 60 minutes, and 8 an hour or more.
- 15+ min early212 flights62.7%
- Within 15 min108 flights32.0%
- 15–29 min late3 flights0.9%
- 30–59 min late7 flights2.1%
- 1–2 hours late1 flights0.3%
- 2+ hours late7 flights2.1%
Scale runs 0% to 100%.
Share of 338 completed flights by arrival against schedule.
5 of 21 late departures made up the time and arrived on time, 24% of them. Only 2 left on time and still arrived late.
The worst days
Worst days for DL 3015
The latest arrival of the period was on 27 November 2025, 13 hours 36 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The five worst days are spread across November, December, February and March, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 27 November 2025 | 13 hours 36 minutes | Carrier |
| 7 December 2025 | 8 hours 25 minutes | National Airspace System |
| 3 February 2026 | 6 hours 17 minutes | Carrier |
| 16 March 2026 | 2 hours 39 minutes | National Airspace System |
| 9 December 2025 | 2 hours 28 minutes | Late-arriving aircraft |
Delay causes
Why DL 3015 runs late
Carrier accounts for 59% of the 2,768 delay minutes carriers reported here, and the remaining four split what is left.
- 59%Carrier
- 34%National Airspace System
- 5%Late-arriving aircraft
- 1%Extreme weather
The largest share of delay minutes, 59%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 1,629 of the 2,768 delay minutes reported here. The split is drawn from 2,768 delay minutes reported on DL 3015.
Cancellations sit at 1.46% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and routes
What a delay on this flight costs
Badly late arrivals are rare here: only 2.4% 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.
Every one of the 343 flights under DL 3015 in the data flew TYS 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. 343 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 3015
For a booking, DL 3015 has one of the better records a US domestic flight can show: 94.7% on time and 1.46% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- TYS to ATL, every carrier and departure
- ATL to TYS, the return direction
- Delta Air Lines 1743 on the same route93.7%
- 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 day of the week to fly, and why it is the second lever
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.