Flight number record

DL 2566

Delta Air Lines · Detroit to Newark

Route: DTW → EWR
Departs: 07:00
Flights: 340
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s DL 2566, check with Delta Air Lines.

DL 2566 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 12 points better than the national rate of 77.6%. When something does go wrong the average delay runs about an hour. That rests on 340 flights, with a median arrival 9 minutes early.

Set against the rest of the country, DL 2566's record is 12 points better than the US average of 77.6%. That gap is worth roughly 122 fewer late arrivals for every thousand flights.

On time

89.8%

Arrivals under 15 minutes late, of 334 completed flights

Avg delay

60 min

Across delayed arrivals only, not all flights

Cancelled

1.76%

National rate is 1.81%

1 hour+ late

3.3%

National rate is 8.1%

These figures cover 340 flights between July 2025 and June 2026. The median arrival is 9 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 2566 flies

DL 2566 flies DTW to EWR without a single fixed slot. Its most common scheduled departure was 07:00, used on 217 of 340 flights, with 07:05 (57 flights) and 07:20 (35 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 07:00217 flights63.8%
Departs 07:0557 flights16.8%
Departs 07:2035 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 07:00 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and DL 2566 runs level with that at 89.8%. 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 2566 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 2566 is 14 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 beats by 8 points.

DL 2566 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 2566thin sample	340	89.8%	60 min	1.76%	A
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 2566 quarter by quarter

DL 2566 did not run the same all year. Its best quarter was Apr–Jun 2026 at 97.6% on time and its weakest Oct–Dec 2025 at 82.1%, a swing of 16 points on roughly 85 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 202589 flights88.8%
Oct–Dec 202579 flights82.1%
Jan–Mar 202686 flights90.2%
Apr–Jun 202686 flights97.6%

Scale runs 75% to 100%. Rows with fewer than 30 flights show a dash.

By weekday, DL 2566 did best on Tuesday at 96.0% on time and worst on Sunday at 80.9%. Each day rests on about 49 flights, so a gap of 15 points is worth noticing but could still narrow in another year.

Delay causes

Why DL 2566 runs late

One category carries most of the weight here. Carrier accounts for 62% of the 2,022 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
62%
National Airspace System
38%

38% of delay minutes are charged to the National Airspace System: air traffic volume, runway configuration, ground stops. No carrier can price its way out of that, which is why airport choice moves the number here more than carrier choice does. That is 770 minutes out of 2,022, against a national NAS share of 21%. The split is drawn from 2,022 delay minutes reported on DL 2566.

Cancellations sit at 1.76% against a national 1.81%, which is ordinary. Diversions add another 0.00%.

Connections and routes

What a delay on this flight costs

Badly late arrivals are rare here: only 3.3% 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 2566 is not only a DTW to EWR flight. It also flew EWR to DTW (340 flights, 82.9% 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. 340 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 2566
Also flown as	Flights	On time	Avg delay	Cancelled	Grade
EWR to DTWthin sample	340	82.9%	67 min	1.76%	B

What to do with this

Booking DL 2566

For a booking, read DL 2566 as 89.8% on time with 1.76% cancelled over 340 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