Flight number record

DL 1546

Delta Air Lines · Detroit to Baltimore

Route: DTW → BWI
Departs: 10:10
Flights: 293
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 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 8 points better than the national rate of 77.6%. When something does go wrong the average delay runs about 50 minutes. That rests on 293 flights, with a median arrival 12 minutes early.

Set against the rest of the country, DL 1546's record is 8 points better than the US average of 77.6%. That gap is worth roughly 80 fewer late arrivals for every thousand flights.

On time

85.6%

Arrivals under 15 minutes late, of 292 completed flights

Avg delay

50 min

Across delayed arrivals only, not all flights

Cancelled

0.34%

National rate is 1.81%

1 hour+ late

4.5%

National rate is 8.1%

These figures cover 293 flights between July 2025 and June 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.

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 78 of 293 flights, with 10:05 (34 flights) and 08:55 (31 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 10:1078 flights26.6%
Departs 10:0534 flights11.6%
Departs 08:5531 flights10.6%

Scale runs 0% to 100%. Rows with fewer than 30 flights show a dash.

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 84.1%, and DL 1546 runs level with that at 85.6%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.

Against the route

DL 1546 next to DTW to BWI

Every carrier on DTW to BWI combined arrived on time 80.9% of the time across 2,261 flights, so DL 1546 is 5 points ahead of it. Delta flew 1,204 flights on the same city pair under all its flight numbers, including this one, and those ran 81.9% on time. Across its whole network Delta Air Lines managed 81.6%, which this flight beats by 4 points.

DL 1546 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 1546thin sample	293	85.6%	50 min	0.34%	A+
All Delta Air Lines on DTW–BWI	1,204	81.9%	73 min	1.50%	B
All carriers on DTW–BWI	2,261	80.9%	65 min	1.33%	B
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	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 89.7% on time and its weakest Jan–Mar 2026 at 76.7%, a swing of 13 points on roughly 73 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 202578 flights89.7%
Oct–Dec 202555 flights89.1%
Jan–Mar 202674 flights76.7%
Apr–Jun 202686 flights87.2%

Scale runs 70% to 95%. Rows with fewer than 30 flights show a dash.

By weekday, DL 1546 did best on Saturday at 91.2% on time and worst on Friday at 77.3%. Each day rests on about 42 flights, so a gap of 14 points is worth noticing but could still narrow in another year.

Delay causes

Why DL 1546 runs late

One category carries most of the weight here. Carrier accounts for 73% of the 2,113 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.

Carrier
73%
National Airspace System
14%
Late-arriving aircraft
9%
Extreme weather
4%

The largest share of delay minutes, 73%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 1,545 of the 2,113 delay minutes reported here. The split is drawn from 2,113 delay minutes reported on DL 1546.

Cancellations are rare at 0.34%, below the national 1.81% 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 4.5% land an hour or more behind schedule, against 8.1% 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 (292 flights, 88.3% 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. 293 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.

Other routes flown as DL 1546
Also flown as	Flights	On time	Avg delay	Cancelled	Grade
BWI to DTWthin sample	292	88.3%	108 min	0.68%	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: 85.6% on time and 0.34% cancelled. That is a base rate, not a promise about any single day.

Where to go next

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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.

Key figures