Flight number record

DL 2577

Delta Air Lines · Detroit to Newark

Route: DTW → EWR
Departs: 10:20
Flights: 362
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s DL 2577, check with Delta Air Lines.

DL 2577 lands a B, 3 points better than the national rate of 77.6%. About one flight in five arrives 15 minutes late or worse, and those flights are late by a little over an hour on average. That is a workable record, not a spotless one. That rests on 362 flights, with a median arrival 10 minutes early.

On time

80.1%

Arrivals under 15 minutes late, of 352 completed flights

Avg delay

74 min

Across delayed arrivals only, not all flights

Cancelled

2.49%

National rate is 1.81%

1 hour+ late

9.4%

National rate is 8.1%

These figures cover 362 flights between July 2025 and June 2026. Beyond the headline rate, 9.4% 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 2577 flies

DL 2577 flies DTW to EWR without a single fixed slot. Its most common scheduled departure was 10:20, used on 127 of 362 flights, with 10:25 (68 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 10:20127 flights35.1%
Departs 10:2568 flights18.8%

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 10:20 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 84.1%, and DL 2577 runs 4 points worse at 80.1%. 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 2577 next to DTW to EWR

Every carrier on DTW to EWR combined arrived on time 75.8% of the time across 3,764 flights, so DL 2577 is 4 points ahead of it. Delta flew 1,621 flights on the same city pair under all its flight numbers, including this one, and those ran 74.0% on time. Across its whole network Delta Air Lines managed 81.6%, which this flight trails by 2 points.

DL 2577 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 2577thin sample	362	80.1%	74 min	2.49%	B
All Delta Air Lines on DTW–EWR	1,621	74.0%	81 min	3.45%	C−
All carriers on DTW–EWR	3,764	75.8%	78 min	5.05%	B−
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	B

Across the year

DL 2577 quarter by quarter

Quarter by quarter DL 2577 held fairly steady: 84.3% in Jul–Sep 2025, 76.1% in Oct–Dec 2025, 76.7% in Jan–Mar 2026 and 83.1% in Apr–Jun 2026. A spread of 8 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202590 flights84.3%
Oct–Dec 202591 flights76.1%
Jan–Mar 202690 flights76.7%
Apr–Jun 202691 flights83.1%

Scale runs 70% to 90%. Rows with fewer than 30 flights show a dash.

By weekday, DL 2577 did best on Thursday at 94.0% on time and worst on Sunday at 73.5%. Each day rests on about 52 flights, so a gap of 21 points is worth noticing but could still narrow in another year.

Delay causes

Why DL 2577 runs late

One category carries most of the weight here. Carrier accounts for 51% of the 5,198 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
51%
Late-arriving aircraft
27%
National Airspace System
18%
Extreme weather
4%

The largest share of delay minutes, 51%, 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 2,659 of the 5,198 delay minutes reported here. The split is drawn from 5,198 delay minutes reported on DL 2577.

Cancellations sit at 2.49% against a national 1.81%, which is ordinary. Diversions add another 0.28%.

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. 9.4% 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.

DL 2577 is not only a DTW to EWR flight. It also flew EWR to DTW (362 flights, 79.6% 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. 362 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 2577
Also flown as	Flights	On time	Avg delay	Cancelled	Grade
EWR to DTWthin sample	362	79.6%	98 min	2.21%	B

What to do with this

Booking DL 2577

For a booking, read DL 2577 as 80.1% on time with 2.49% cancelled over 362 flights. Those are rates from the past twelve months, not a forecast for any particular 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