Flight number record
DL 3140
Delta Air Lines · Dayton to Atlanta
- Route
- DAY → ATL
- Departs
- 06:00
- Flights
- 349
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 3140, check with Delta Air Lines.
DL 3140 earns an A. Close to nine flights in ten arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 15 points better than the national rate of 77.3%. When something does go wrong the average delay runs close to two hours. That rests on 349 flights, with a median arrival 16 minutes early.
Set against the rest of the country, DL 3140's record is 15 points better than the US average of 77.3%. That gap is worth roughly 145 fewer late arrivals for every thousand flights.
Key figures
On time
91.8%
Arrivals under 15 minutes late, of 340 completed flights
Avg delay
117 min
Across delayed arrivals only, not all flights
Cancelled
2.58%
National rate is 1.89%
1 hour+ late
4.1%
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 3140 flies
DL 3140 is scheduled to leave Dayton (DAY) at 06:00 local time and reach Atlanta (ATL) at 07:45. That slot held for 307 of the 349 scheduled departures in the data, so the figures below describe one steady operation rather than a number that moved around the clock.
- Departs 06:00307 flights88.0%
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 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 3140 runs 3 points better at 91.8%. 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 3140 next to DAY to ATL
Every carrier on DAY to ATL combined arrived on time 89.4% of the time across 1,408 flights, so DL 3140 is 2 points ahead of it. Across its whole network Delta Air Lines managed 81.1%, which this flight beats by 11 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 3140thin sample | 349 | 91.8% | 117 min | 2.58% | A |
| All Delta Air Lines on DAY–ATL | 1,408 | 89.4% | 96 min | 1.92% | A |
| All carriers on DAY–ATL | 1,408 | 89.4% | 96 min | 1.92% | A |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 3140 quarter by quarter
DL 3140 did not run the same all year. Its best quarter was Jul–Sep 2026 at 98.3% on time and its weakest Jul–Sep 2025 at 83.3%, a swing of 15 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 flights83.3%
- Oct–Dec 202580 flights92.4%
- Jan–Mar 202686 flights91.4%
- Apr–Jun 202691 flights90.0%
- Jul–Sep 202662 flights98.3%
Scale runs 75% to 100%.
By weekday, DL 3140 ranged from 88.0% on Wednesday to 96.0% on Thursday. 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 3140 runs when it is late
DL 3140 often beats the schedule: 192 of 340 completed flights, 56%, arrived 15 minutes or more early. The 28 late arrivals split 6 under half an hour, 8 between 30 and 60 minutes, and 14 an hour or more.
- 15+ min early192 flights56.5%
- Within 15 min120 flights35.3%
- 15–29 min late6 flights1.8%
- 30–59 min late8 flights2.4%
- 1–2 hours late7 flights2.1%
- 2+ hours late7 flights2.1%
Scale runs 0% to 100%.
Share of 340 completed flights by arrival against schedule.
4 of 29 late departures made up the time and arrived on time, 14% of them. Only 3 left on time and still arrived late.
The worst days
Worst days for DL 3140
The latest arrival of the period was on 12 April 2026, 9 hours 37 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 |
|---|---|---|
| 12 April 2026 | 9 hours 37 minutes | Carrier |
| 9 January 2026 | 8 hours 13 minutes | Carrier |
| 21 July 2026 | 5 hours 36 minutes | Carrier |
| 20 September 2025 | 5 hours 7 minutes | Carrier |
| 14 December 2025 | 3 hours 50 minutes | Extreme weather |
Delay causes
Why DL 3140 runs late
Carrier accounts for 85% of the 3,288 delay minutes carriers reported here, and the remaining four split what is left.
- 85%Carrier
- 8%Extreme weather
- 7%National Airspace System
The largest share of delay minutes, 85%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 2,801 of the 3,288 delay minutes reported here. The split is drawn from 3,288 delay minutes reported on DL 3140.
Cancellations run at 2.58%, against 1.89% nationally. That is about one flight in 40 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 4.1% 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 349 flights under DL 3140 in the data flew DAY 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. 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 3140
For a booking, the cancellation rate is the figure to plan around on DL 3140: 2.58% of its 349 scheduled flights did not operate. A late arrival costs close to two hours, but a cancellation costs the day, so leave a later option open.
Related
Where to go next
- DAY to ATL, every carrier and departure
- ATL to DAY, the return direction
- Delta Air Lines 3108 on the same route92.6%
- Delta Air Lines 2763 on the same route88.3%
- Delta Air Lines 3088 on the same route83.3%
- 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, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.