Flight number record
DL 2577
Delta Air Lines · Detroit to Newark
- Route
- DTW → EWR
- Departs
- 10:20
- Flights
- 362
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 2577, check with Delta Air Lines.
DL 2577 lands a B−, 4 points better than the national rate of 77.3%. 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 rests on 362 flights, with a median arrival 10 minutes early.
Set against the rest of the country, DL 2577's record is 4 points better than the US average of 77.3%. That gap is worth roughly 41 fewer late arrivals for every thousand flights.
Key figures
On time
81.4%
Arrivals under 15 minutes late, of 350 completed flights
Avg delay
73 min
Across delayed arrivals only, not all flights
Cancelled
3.31%
National rate is 1.89%
1 hour+ late
8.0%
National rate is 8.3%
These figures cover 362 flights between September 2025 and August 2026. Beyond the headline rate, 8.0% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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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 10:15 (86 flights) and 10:25 (47 flights) next.
- Departs 10:20127 flights35.1%
- Departs 10:1586 flights23.8%
- Departs 10:2547 flights13.0%
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 10:20 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and DL 2577 runs 3 points worse at 81.4%. 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 2577 next to DTW to EWR
Every carrier on DTW to EWR combined arrived on time 77.4% of the time across 3,642 flights, so DL 2577 is 4 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 75.4% on time. Across its whole network Delta Air Lines managed 81.1%, close to this flight's figure.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 2577thin sample | 362 | 81.4% | 73 min | 3.31% | B− |
| All Delta Air Lines on DTW–EWR | 1,612 | 75.4% | 78 min | 3.91% | B− |
| All carriers on DTW–EWR | 3,642 | 77.4% | 76 min | 5.55% | B− |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 2577 quarter by quarter
DL 2577 did not run the same all year. Its best quarter was Jul–Sep 2026 at 88.1% on time and its weakest Oct–Dec 2025 at 76.1%, a swing of 12 points on roughly 91 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 202528 flights—
- Oct–Dec 202591 flights76.1%
- Jan–Mar 202690 flights76.7%
- Apr–Jun 202691 flights83.1%
- Jul–Sep 202662 flights88.1%
Scale runs 70% to 95%. Rows with fewer than 30 flights show a dash.
By weekday, DL 2577 did best on Thursday at 88.2% on time and worst on Sunday at 75.5%. Each day rests on about 52 flights, so a gap of 13 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 2577 runs when it is late
DL 2577 often beats the schedule: 120 of 350 completed flights, 34%, arrived 15 minutes or more early. The 65 late arrivals split 20 under half an hour, 17 between 30 and 60 minutes, and 28 an hour or more.
- 15+ min early120 flights34.3%
- Within 15 min165 flights47.1%
- 15–29 min late20 flights5.7%
- 30–59 min late17 flights4.9%
- 1–2 hours late16 flights4.6%
- 2+ hours late12 flights3.4%
Scale runs 0% to 100%.
Share of 350 completed flights by arrival against schedule.
12 of 67 late departures made up the time and arrived on time, 18% of them. 10 flights left on time and still arrived late.
The worst days
Worst days for DL 2577
The latest arrival of the period was on 16 May 2026, 3 hours 56 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The five worst days are spread across May, December, January and April, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 16 May 2026 | 3 hours 56 minutes | Carrier |
| 14 December 2025 | 3 hours 54 minutes | National Airspace System |
| 26 January 2026 | 3 hours 45 minutes | Late-arriving aircraft |
| 18 April 2026 | 3 hours 43 minutes | Extreme weather |
| 4 April 2026 | 3 hours 12 minutes | Carrier |
Delay causes
Why DL 2577 runs late
Carrier accounts for 48% of the 4,719 delay minutes carriers reported here, and the remaining four split what is left.
- 48%Carrier
- 27%Late-arriving aircraft
- 19%National Airspace System
- 5%Extreme weather
The largest share of delay minutes, 48%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 2,284 of the 4,719 delay minutes reported here. The split is drawn from 4,719 delay minutes reported on DL 2577.
Cancellations run at 3.31%, 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
8.0% of arrivals land an hour or more late, close to the national 8.3%, so a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last a little over an hour, which a normal layover absorbs.
DL 2577 is not only a DTW to EWR flight. It also flew EWR to DTW (362 flights, 81.0% 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.
| Also flown as | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| EWR to DTWthin sample | 362 | 81.0% | 94 min | 2.76% | B |
What to do with this
Booking DL 2577
For a booking, the cancellation rate is the figure to plan around on DL 2577: 3.31% of its 362 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.
Related
Where to go next
- DTW to EWR, every carrier and departure
- EWR to DTW, the return direction
- Delta Air Lines 2609 on the same route70.6%
- Delta Air Lines 2566 on the same route90.1%
- Delta Air Lines 2573 on the same route72.2%
- Detroit Metropolitan Wayne County (DTW) delay statistics
- Newark Liberty International (EWR) delay statistics
- Delta Air Lines on-time record
- Every Delta Air Lines flight number with a record
- The most and least reliable flight numbers in the US
- What a cancellation rate actually tells you (and what it hides)
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 ; recomputed monthly. How this data is collected.