Flight number record
DL 1557
Delta Air Lines · Detroit to Nashville
- Route
- DTW → BNA
- Departs
- 12:30
- Flights
- 304
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 1557, check with Delta Air Lines.
DL 1557 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 11 points better than the national rate of 77.3%. When something does go wrong the average delay runs about an hour. That rests on 304 flights, with a median arrival 10 minutes early.
Set against the rest of the country, DL 1557's record is 11 points better than the US average of 77.3%. That gap is worth roughly 112 fewer late arrivals for every thousand flights.
Key figures
On time
88.5%
Arrivals under 15 minutes late, of 296 completed flights
Avg delay
59 min
Across delayed arrivals only, not all flights
Cancelled
1.97%
National rate is 1.89%
1 hour+ late
4.4%
National rate is 8.3%
These figures cover 304 flights between September 2025 and August 2026. The median arrival is 10 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 1557 flies
DL 1557 flies DTW to BNA without a single fixed slot. Its most common scheduled departure was 12:30, used on 87 of 304 flights, with 12:15 (59 flights) and 12:20 (54 flights) next.
- Departs 12:3087 flights28.6%
- Departs 12:1559 flights19.4%
- Departs 12:2054 flights17.8%
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 12:30 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and DL 1557 runs 10 points better at 88.5%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
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Against the route
DL 1557 next to DTW to BNA
Every carrier on DTW to BNA combined arrived on time 78.1% of the time across 2,413 flights, so DL 1557 is 10 points ahead of it. Delta flew 1,405 flights on the same city pair under all its flight numbers, including this one, and those ran 79.9% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight beats by 7 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 1557thin sample | 304 | 88.5% | 59 min | 1.97% | A |
| All Delta Air Lines on DTW–BNA | 1,405 | 79.9% | 57 min | 1.78% | B |
| All carriers on DTW–BNA | 2,413 | 78.1% | 52 min | 1.33% | B |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 1557 quarter by quarter
DL 1557 did not run the same all year. Its best quarter was Jul–Sep 2026 at 95.0% on time and its weakest Oct–Dec 2025 at 82.1%, a swing of 13 points on roughly 76 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 202527 flights—
- Oct–Dec 202587 flights82.1%
- Jan–Mar 202643 flights85.4%
- Apr–Jun 202686 flights88.1%
- Jul–Sep 202661 flights95.0%
Scale runs 75% to 100%. Rows with fewer than 30 flights show a dash.
By weekday, DL 1557 ranged from 81.8% on Saturday to 93.3% on Thursday. With about 43 flights behind each day, a spread of 12 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late DL 1557 runs when it is late
The 34 late arrivals split 11 under half an hour, 10 between 30 and 60 minutes, and 13 an hour or more.
- 15+ min early70 flights23.6%
- Within 15 min192 flights64.9%
- 15–29 min late11 flights3.7%
- 30–59 min late10 flights3.4%
- 1–2 hours late10 flights3.4%
- 2+ hours late3 flights1.0%
Scale runs 0% to 100%.
Share of 296 completed flights by arrival against schedule.
8 of 35 late departures made up the time and arrived on time, 23% of them. 7 flights left on time and still arrived late.
The worst days
Worst days for DL 1557
The latest arrival of the period was on 2 May 2026, 3 hours 25 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 2 May 2026 | 3 hours 25 minutes | Carrier |
| 14 April 2026 | 2 hours 49 minutes | Carrier |
| 17 March 2026 | 2 hours 13 minutes | Late-arriving aircraft |
| 3 April 2026 | 1 hour 46 minutes | Carrier |
| 30 November 2025 | 1 hour 38 minutes | Late-arriving aircraft |
Delay causes
Why DL 1557 runs late
Carrier accounts for 60% of the 1,999 delay minutes carriers reported here, and the remaining four split what is left.
- 60%Carrier
- 25%Late-arriving aircraft
- 14%National Airspace System
- 1%Extreme weather
The largest share of delay minutes, 60%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 1,198 of the 1,999 delay minutes reported here. The split is drawn from 1,999 delay minutes reported on DL 1557.
Cancellations sit at 1.97% against a national 1.89%, which is ordinary. Diversions add another 0.66%.
Connections and routes
What a delay on this flight costs
Badly late arrivals are rare here: only 4.4% 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.
DL 1557 is not only a DTW to BNA flight. It also flew BNA to DTW (301 flights, 87.8% on time) often enough to be scored on its own. Airlines attach one number to several legs of an aircraft's day, and each leg keeps its own record here, so check which city pair is on your booking before reading a rate.
One caution: this is a thin sample. 304 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.
| Also flown as | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| BNA to DTWthin sample | 301 | 87.8% | 100 min | 1.99% | A |
What to do with this
Booking DL 1557
For a booking, read DL 1557 as 88.5% on time with 1.97% cancelled over 304 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- DTW to BNA, every carrier and departure
- BNA to DTW, the return direction
- Delta Air Lines 2126 on the same route74.2%
- Delta Air Lines 2682 on the same route88.0%
- Delta Air Lines 2316 on the same route69.4%
- Detroit Metropolitan Wayne County (DTW) delay statistics
- Nashville International (BNA) 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.