Flight number record
DL 1546
Delta Air Lines · Detroit to Baltimore
- Route
- DTW → BWI
- Departs
- 10:10
- Flights
- 307
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 1546, check with Delta Air Lines.
DL 1546 earns an A+. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 9 points better than the national rate of 77.3%. When something does go wrong the average delay runs roughly 45 minutes. That rests on 307 flights, with a median arrival 12 minutes early.
Set against the rest of the country, DL 1546's record is 9 points better than the US average of 77.3%. That gap is worth roughly 86 fewer late arrivals for every thousand flights.
Key figures
On time
85.9%
Arrivals under 15 minutes late, of 306 completed flights
Avg delay
47 min
Across delayed arrivals only, not all flights
Cancelled
0.33%
National rate is 1.89%
1 hour+ late
4.2%
National rate is 8.3%
These figures cover 307 flights between September 2025 and August 2026. The median arrival is 12 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 1546 flies
DL 1546 flies DTW to BWI without a single fixed slot. Its most common scheduled departure was 10:10, used on 108 of 307 flights, with 10:05 (34 flights) and 08:55 (31 flights) next.
- Departs 10:10108 flights35.2%
- Departs 10:0534 flights11.1%
- Departs 08:5531 flights10.1%
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 10:10 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and DL 1546 runs 2 points better at 85.9%. 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 1546 next to DTW to BWI
Every carrier on DTW to BWI combined arrived on time 80.7% of the time across 2,230 flights, so DL 1546 is 5 points ahead of it. Delta flew 1,224 flights on the same city pair under all its flight numbers, including this one, and those ran 82.0% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight beats by 5 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 1546thin sample | 307 | 85.9% | 47 min | 0.33% | A+ |
| All Delta Air Lines on DTW–BWI | 1,224 | 82.0% | 69 min | 1.63% | B |
| All carriers on DTW–BWI | 2,230 | 80.7% | 62 min | 1.43% | B |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 1546 quarter by quarter
DL 1546 did not run the same all year. Its best quarter was Jul–Sep 2025 at 93.3% on time and its weakest Jan–Mar 2026 at 76.7%, a swing of 17 points on roughly 61 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 202555 flights89.1%
- Jan–Mar 202674 flights76.7%
- Apr–Jun 202686 flights87.2%
- Jul–Sep 202662 flights88.7%
Scale runs 70% to 100%.
By weekday, DL 1546 did best on Thursday at 91.3% on time and worst on Friday at 73.9%. Each day rests on about 44 flights, so a gap of 17 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 1546 runs when it is late
DL 1546 often beats the schedule: 112 of 306 completed flights, 37%, arrived 15 minutes or more early. The 43 late arrivals split 18 under half an hour, 12 between 30 and 60 minutes, and 13 an hour or more.
- 15+ min early112 flights36.6%
- Within 15 min151 flights49.3%
- 15–29 min late18 flights5.9%
- 30–59 min late12 flights3.9%
- 1–2 hours late11 flights3.6%
- 2+ hours late2 flights0.7%
Scale runs 0% to 100%.
Share of 306 completed flights by arrival against schedule.
7 of 39 late departures made up the time and arrived on time, 18% of them. 11 flights left on time and still arrived late.
The worst days
Worst days for DL 1546
The latest arrival of the period was on 3 November 2025, 3 hours 4 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on five of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 3 November 2025 | 3 hours 4 minutes | Carrier |
| 17 July 2026 | 2 hours 18 minutes | Carrier |
| 12 June 2026 | 1 hour 45 minutes | Carrier |
| 15 January 2026 | 1 hour 41 minutes | Carrier |
| 5 June 2026 | 1 hour 33 minutes | Carrier |
Delay causes
Why DL 1546 runs late
Carrier accounts for 70% of the 2,015 delay minutes carriers reported here, and the remaining four split what is left.
- 70%Carrier
- 16%National Airspace System
- 11%Late-arriving aircraft
- 4%Extreme weather
The largest share of delay minutes, 70%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 1,404 of the 2,015 delay minutes reported here. The split is drawn from 2,015 delay minutes reported on DL 1546.
Cancellations are rare at 0.33%, 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 4.2% 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 1546 is not only a DTW to BWI flight. It also flew BWI to DTW (306 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. 307 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 |
|---|---|---|---|---|---|
| BWI to DTWthin sample | 306 | 87.8% | 108 min | 0.65% | A+ |
What to do with this
Booking DL 1546
For a booking, DL 1546 has one of the better records a US domestic flight can show: 85.9% on time and 0.33% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- DTW to BWI, every carrier and departure
- BWI to DTW, the return direction
- Delta Air Lines 2715 on the same route77.9%
- Delta Air Lines 2480 on the same route80.0%
- Detroit Metropolitan Wayne County (DTW) delay statistics
- Baltimore/Washington International Thurgood Marshall (BWI) 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.