Flight number record
DL 1913
Delta Air Lines · Detroit to San Juan
- Route
- DTW → SJU
- Departs
- 08:35
- Flights
- 304
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 1913, check with Delta Air Lines.
DL 1913 lands a B+, about a point worse than the national rate of 77.3%. About one flight in four arrives 15 minutes late or worse, and those flights are late by roughly 50 minutes on average. That rests on 304 flights, with a median arrival 1 minute early.
Key figures
On time
76.0%
Arrivals under 15 minutes late, of 300 completed flights
Avg delay
48 min
Across delayed arrivals only, not all flights
Cancelled
0.66%
National rate is 1.89%
1 hour+ late
4.7%
National rate is 8.3%
These figures cover 304 flights between September 2025 and August 2026. On-time means an arrival less than 15 minutes after the scheduled gate time, the same threshold the Department of Transportation uses in its own reports. Cancelled and diverted flights are excluded from the on-time rate and counted separately, which is why the cancellation column matters on its own.
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Schedule
When DL 1913 flies
DL 1913 flies DTW to SJU without a single fixed slot. Its most common scheduled departure was 08:35, used on 117 of 304 flights, with 08:43 (38 flights) and 08:36 (36 flights) next.
- Departs 08:35117 flights38.5%
- Departs 08:4338 flights12.5%
- Departs 08:3636 flights11.8%
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 08:35 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and DL 1913 runs 8 points worse at 76.0%. 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 1913 next to DTW to SJU
Every carrier on DTW to SJU combined arrived on time 75.5% of the time across 332 flights, so DL 1913 is about level with it. Across its whole network Delta Air Lines managed 81.1%, which this flight trails by 5 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 1913thin sample | 304 | 76.0% | 48 min | 0.66% | B+ |
| All Delta Air Lines on DTW–SJUthin sample | 321 | 75.6% | 47 min | 0.93% | B+ |
| All carriers on DTW–SJUthin sample | 332 | 75.5% | 46 min | 0.90% | B+ |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 1913 quarter by quarter
DL 1913 did not run the same all year. Its best quarter was Jul–Sep 2026 at 88.4% on time and its weakest Oct–Dec 2025 at 69.1%, a swing of 19 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 202511 flights—
- Oct–Dec 202569 flights69.1%
- Jan–Mar 202690 flights69.3%
- Apr–Jun 202691 flights81.1%
- Jul–Sep 202643 flights88.4%
Scale runs 60% to 95%. Rows with fewer than 30 flights show a dash.
By weekday, DL 1913 did best on Thursday at 89.2% on time and worst on Sunday at 67.5%. Each day rests on about 43 flights, so a gap of 22 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 1913 runs when it is late
The 72 late arrivals split 32 under half an hour, 26 between 30 and 60 minutes, and 14 an hour or more.
- 15+ min early53 flights17.7%
- Within 15 min175 flights58.3%
- 15–29 min late32 flights10.7%
- 30–59 min late26 flights8.7%
- 1–2 hours late9 flights3.0%
- 2+ hours late5 flights1.7%
Scale runs 0% to 100%.
Share of 300 completed flights by arrival against schedule.
7 of 42 late departures made up the time and arrived on time, 17% of them. In the other direction, 37 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 SJU.
The worst days
Worst days for DL 1913
The latest arrival of the period was on 9 November 2025, 4 hours 40 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on five of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 9 November 2025 | 4 hours 40 minutes | Carrier |
| 19 June 2026 | 4 hours 20 minutes | Carrier |
| 5 December 2025 | 2 hours 50 minutes | Carrier |
| 25 November 2025 | 2 hours 44 minutes | Carrier |
| 20 December 2025 | 2 hours 22 minutes | Carrier |
Delay causes
Why DL 1913 runs late
Carrier accounts for 46% of the 3,454 delay minutes carriers reported here, and the remaining four split what is left.
- 46%Carrier
- 45%National Airspace System
- 5%Late-arriving aircraft
- 4%Extreme weather
The largest share of delay minutes, 46%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 1,589 of the 3,454 delay minutes reported here. The split is drawn from 3,454 delay minutes reported on DL 1913.
Cancellations are rare at 0.66%, below the national 1.89% 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
Badly late arrivals are rare here: only 4.7% 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.
At 1,930 miles this is transcontinental flying, and long routes get a quiet structural advantage. Scheduled block time on a flight this length carries more padding in absolute minutes, so a twenty-minute late departure often still becomes an on-time arrival. Read the on-time rate here as slightly flattering next to a short-haul route with the same operational quality.
DL 1913 is not only a DTW to SJU flight. It also flew SJU to DTW (304 flights, 85.5% 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. 304 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 |
|---|---|---|---|---|---|
| SJU to DTWthin sample | 304 | 85.5% | 47 min | 1.64% | A |
What to do with this
Booking DL 1913
For a booking, read DL 1913 as 76.0% on time with 0.66% cancelled over 304 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- Detroit Metropolitan Wayne County (DTW) delay statistics
- Luis Munoz Marin International (SJU) 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
- Worst months to fly in the US, ranked by the data
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.