Flight number record
DL 2439
Delta Air Lines · Nashville to Detroit
- Route
- BNA → DTW
- Departs
- 06:00
- Flights
- 365
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 2439, check with Delta Air Lines.
DL 2439 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 2.1 hours. That rests on 365 flights, with a median arrival 13 minutes early.
Set against the rest of the country, DL 2439's record is 17 points better than the US average of 77.3%. That gap is worth roughly 172 fewer late arrivals for every thousand flights.
Key figures
On time
94.5%
Arrivals under 15 minutes late, of 362 completed flights
Avg delay
129 min
Across delayed arrivals only, not all flights
Cancelled
0.82%
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 13 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 2439 flies
DL 2439 flies BNA to DTW without a single fixed slot. Its most common scheduled departure was 06:00, used on 136 of 365 flights, with 06:05 (110 flights) and 06:15 (84 flights) next.
- Departs 06:00136 flights37.3%
- Departs 06:05110 flights30.1%
- Departs 06:1584 flights23.0%
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 2439 runs 5 points better at 94.5%. 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 2439 next to BNA to DTW
Every carrier on BNA to DTW combined arrived on time 77.4% of the time across 2,410 flights, so DL 2439 is 17 points ahead of it. Delta flew 1,406 flights on the same city pair under all its flight numbers, including this one, and those ran 86.0% 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 2439 | 365 | 94.5% | 129 min | 0.82% | A+ |
| All Delta Air Lines on BNA–DTW | 1,406 | 86.0% | 93 min | 1.85% | A |
| All carriers on BNA–DTW | 2,410 | 77.4% | 62 min | 1.29% | B |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 2439 quarter by quarter
Quarter by quarter DL 2439 held fairly steady: 93.3% in Jul–Sep 2025, 92.4% in Oct–Dec 2025, 93.2% in Jan–Mar 2026, 98.9% in Apr–Jun 2026 and 93.4% in Jul–Sep 2026. A spread of 7 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Jul–Sep 202530 flights93.3%
- Oct–Dec 202592 flights92.4%
- Jan–Mar 202690 flights93.2%
- Apr–Jun 202691 flights98.9%
- Jul–Sep 202662 flights93.4%
Scale runs 85% to 100%.
By weekday, DL 2439 ranged from 90.4% on Monday to 98.0% on Saturday. With about 52 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 2439 runs when it is late
DL 2439 often beats the schedule: 161 of 362 completed flights, 44%, arrived 15 minutes or more early. The 20 late arrivals split 7 under half an hour, 4 between 30 and 60 minutes, and 9 an hour or more.
- 15+ min early161 flights44.5%
- Within 15 min181 flights50.0%
- 15–29 min late7 flights1.9%
- 30–59 min late4 flights1.1%
- 1–2 hours late2 flights0.6%
- 2+ hours late7 flights1.9%
Scale runs 0% to 100%.
Share of 362 completed flights by arrival against schedule.
Only 14 of 362 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 2439
The latest arrival of the period was on 15 March 2026, 12 hours 56 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 |
|---|---|---|
| 15 March 2026 | 12 hours 56 minutes | National Airspace System |
| 19 December 2025 | 5 hours 8 minutes | Carrier |
| 8 March 2026 | 5 hours 5 minutes | Carrier |
| 15 December 2025 | 3 hours 50 minutes | Carrier |
| 28 January 2026 | 3 hours 11 minutes | Extreme weather |
Delay causes
Why DL 2439 runs late
Carrier accounts for 52% of the 2,575 delay minutes carriers reported here, and the remaining four split what is left.
- 52%Carrier
- 42%National Airspace System
- 6%Extreme weather
42% of delay minutes are charged to the National Airspace System: air traffic volume, runway configuration, ground stops. No carrier can price its way out of that, which is why airport choice moves the number here more than carrier choice does. That is 1,076 minutes out of 2,575, against a national NAS share of 21%. The split is drawn from 2,575 delay minutes reported on DL 2439.
Cancellations are rare at 0.82%, 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
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.
Every one of the 365 flights under DL 2439 in the data flew BNA to DTW. 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 2439
For a booking, DL 2439 has one of the better records a US domestic flight can show: 94.5% on time and 0.82% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- BNA to DTW, every carrier and departure
- DTW to BNA, the return direction
- Delta Air Lines 2682 on the same route88.5%
- Delta Air Lines 2316 on the same route73.8%
- Delta Air Lines 1557 on the same route87.8%
- Nashville International (BNA) delay statistics
- Detroit Metropolitan Wayne County (DTW) 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
- Worst months to fly in the US, ranked by the data
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.