Flight number record

DL 2566

Delta Air Lines · Newark to Detroit

Route: EWR → DTW
Departs: 09:39
Flights: 342
Period: September 2025 to August 2026

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

DL 2566 lands a B−, 6 points better than the national rate of 77.3%. About one flight in six arrives 15 minutes late or worse, and those flights are late by a little over an hour on average. That rests on 342 flights, with a median arrival 12 minutes early.

Set against the rest of the country, DL 2566's record is 6 points better than the US average of 77.3%. That gap is worth roughly 58 fewer late arrivals for every thousand flights.

On time

83.1%

Arrivals under 15 minutes late, of 331 completed flights

Avg delay

72 min

Across delayed arrivals only, not all flights

Cancelled

3.22%

National rate is 1.89%

1 hour+ late

4.5%

National rate is 8.3%

These figures cover 342 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 2566 flies

DL 2566 flies EWR to DTW without a single fixed slot. Its most common scheduled departure was 09:39, used on 95 of 342 flights, with 09:47 (45 flights) and 09:43 (36 flights) next.

Departs 09:3995 flights27.8%
Departs 09:4745 flights13.2%
Departs 09:4336 flights10.5%

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 09:39 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and DL 2566 runs level with that at 83.1%. 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 2566 next to EWR to DTW

Every carrier on EWR to DTW combined arrived on time 79.9% of the time across 3,660 flights, so DL 2566 is 3 points ahead of it. Delta flew 1,612 flights on the same city pair under all its flight numbers, including this one, and those ran 79.6% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight beats by 2 points.

DL 2566 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 2566thin sample	342	83.1%	72 min	3.22%	B−
All Delta Air Lines on EWR–DTW	1,612	79.6%	108 min	4.03%	B−
All carriers on EWR–DTW	3,660	79.9%	88 min	5.63%	B−
Delta Air Lines, whole network	1,039,517	81.1%	71 min	1.74%	B

Across the year

DL 2566 quarter by quarter

DL 2566 did not run the same all year. Its best quarter was Jul–Sep 2025 at 93.3% on time and its weakest Oct–Dec 2025 at 64.1%, a swing of 29 points on roughly 68 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 202579 flights64.1%
Jan–Mar 202686 flights86.6%
Apr–Jun 202686 flights92.9%
Jul–Sep 202661 flights83.9%

Scale runs 55% to 100%.

By weekday, DL 2566 did best on Tuesday at 89.6% on time and worst on Friday at 73.5%. Each day rests on about 49 flights, so a gap of 16 points is worth noticing but could still narrow in another year.

Arrival by arrival

How late DL 2566 runs when it is late

DL 2566 often beats the schedule: 134 of 331 completed flights, 40%, arrived 15 minutes or more early. The 56 late arrivals split 20 under half an hour, 21 between 30 and 60 minutes, and 15 an hour or more.

15+ min early134 flights40.5%
Within 15 min141 flights42.6%
15–29 min late20 flights6.0%
30–59 min late21 flights6.3%
1–2 hours late10 flights3.0%
2+ hours late5 flights1.5%

Scale runs 0% to 100%.

Share of 331 completed flights by arrival against schedule.

Time lost at the gate mostly stays lost. Of 41 departures that left 15 minutes late or more, only 4 made it up before arrival. In the other direction, 19 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at DTW.

The worst days

Worst days for DL 2566

The latest arrival of the period was on 21 November 2025, 14 hours 3 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). On three of the five worst days the largest share was filed as a late-arriving aircraft.

The latest arrivals of DL 2566 in the period
Date	Arrived late by	Largest filed cause
21 November 2025	14 hours 3 minutes	Carrier
14 December 2025	5 hours 22 minutes	Late-arriving aircraft
27 August 2026	4 hours 57 minutes	Late-arriving aircraft
27 March 2026	3 hours 49 minutes	Carrier
5 December 2025	3 hours 11 minutes	Late-arriving aircraft

Delay causes

Why DL 2566 runs late

Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 4,004 reported delay minutes.

Carrier
38%
Late-arriving aircraft
36%
National Airspace System
21%
Extreme weather
5%

36% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 4,004 reported delay minutes here, that single category outweighs weather by 7 to one. The split is drawn from 4,004 delay minutes reported on DL 2566.

Cancellations run at 3.22%, against 1.89% nationally. That is about one flight in 30 cancelled outright. A cancelled flight is invisible in every on-time figure on this page, so the punctuality numbers above describe only the flights that actually operated.

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 8.3% 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 2566 is not only a EWR to DTW flight. It also flew DTW to EWR (342 flights, 90.1% 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. 342 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
DTW to EWRthin sample	342	90.1%	65 min	2.92%	A

What to do with this

Booking DL 2566

For a booking, the cancellation rate is the figure to plan around on DL 2566: 3.22% of its 342 scheduled flights did not operate. A late arrival costs a little over an hour, but a cancellation costs the day, so leave a later option open.

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, September 2025 to August 2026. Last updated 22 October 2026; recomputed monthly. How this data is collected.

Key figures