Flight number record

DL 2548

Delta Air Lines · Detroit to Miami

Route: DTW → MIA
Departs: 18:10
Flights: 302
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s DL 2548, check with Delta Air Lines.

DL 2548 sits in the middle of the pack with a C+. About seven flights in ten arrive on time by the DOT's definition, 5 points worse than the national rate of 77.6%. The late ones land about an hour behind schedule. That rests on 302 flights, with a median arrival 4 minutes early.

The national on-time rate over the same period is 77.6%, so DL 2548 runs 5 points behind the country as a whole. Across a thousand flights that is about 52 extra late arrivals.

On time

72.4%

Arrivals under 15 minutes late, of 301 completed flights

Avg delay

58 min

Across delayed arrivals only, not all flights

Cancelled

0.33%

National rate is 1.81%

1 hour+ late

10.0%

National rate is 8.1%

These figures cover 302 flights between July 2025 and June 2026. Beyond the headline rate, 10.0% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.

Schedule

When DL 2548 flies

DL 2548 flies DTW to MIA without a single fixed slot. Its most common scheduled departure was 18:10, used on 36 of 302 flights, with 18:30 (33 flights) and 18:25 (31 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 18:1036 flights11.9%
Departs 18:3033 flights10.9%
Departs 18:2531 flights10.3%

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 18:10 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.2%, and DL 2548 runs 4 points better at 72.4%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.

Against the route

DL 2548 next to DTW to MIA

Every carrier on DTW to MIA combined arrived on time 80.5% of the time across 1,815 flights, so DL 2548 is 8 points behind it. Delta flew 965 flights on the same city pair under all its flight numbers, including this one, and those ran 78.4% on time. Across its whole network Delta Air Lines managed 81.6%, which this flight trails by 9 points.

DL 2548 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 2548thin sample	302	72.4%	58 min	0.33%	C+
All Delta Air Lines on DTW–MIA	965	78.4%	55 min	0.93%	B+
All carriers on DTW–MIA	1,815	80.5%	65 min	1.38%	B
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	B

Across the year

DL 2548 quarter by quarter

DL 2548 did not run the same all year. Its best quarter was Apr–Jun 2026 at 88.9% on time and its weakest Oct–Dec 2025 at 64.8%, a swing of 24 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 202587 flights70.1%
Oct–Dec 202589 flights64.8%
Jan–Mar 202690 flights75.6%
Apr–Jun 202636 flights88.9%

Scale runs 55% to 95%. Rows with fewer than 30 flights show a dash.

By weekday, DL 2548 did best on Tuesday at 93.2% on time and worst on Saturday at 58.1%. Each day rests on about 43 flights, so a gap of 35 points is worth noticing but could still narrow in another year.

Delay causes

Why DL 2548 runs late

One category carries most of the weight here. Carrier accounts for 56% of the 4,835 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
56%
National Airspace System
30%
Late-arriving aircraft
11%
Extreme weather
3%

The largest share of delay minutes, 56%, 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 2,721 of the 4,835 delay minutes reported here. The split is drawn from 4,835 delay minutes reported on DL 2548.

Cancellations are rare at 0.33%, 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

For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 10.0% of arrivals land a full hour or more behind schedule, against 8.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum here, and two hours if the onward flight is on a separate ticket.

The 1,145 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.

Every one of the 302 flights under DL 2548 in the data flew DTW to MIA. 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. 302 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 2548

For a booking, DL 2548 is one of the weaker ways to fly DTW to MIA: 8 points below the route as a whole. If the schedule allows, compare it with the other departures listed on the route page before settling on this one.

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