Flight profile · Delta Air Lines
DL1913
Detroit (DTW) to San Juan (SJU) · scheduled 8:35 AM – 1:59 PM
How DL1913 performs
899 operations, July 2023 – July 2026.
DL1913 arrived on time 79.5% of the time, against 80.6% for all DTW → SJU flights, so this departure is 1.1 percentage points worse than the route as a whole.
Source: US DOT Bureau of Transportation Statistics · 899 operations, July 2023 – July 2026 · If DL1913 is cancelled or significantly changed, DOT’s automatic refund rule may entitle you to your money back. The refund checker walks through eligibility.
Where DL1913 is right now
A live reading, only if you ask for it. It is not part of the reliability record above.
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Against the rest of the route
| Flight or route | On time | Cancelled | Median delay | Severe | Flights |
|---|---|---|---|---|---|
| DL1913 | 79.5% | 0.22% | -2 min | 4.3% | 899 |
| Delta Air Lines on DTW → SJU | 80.2% | 0.28% | -3 min | 4.2% | 1,062 |
| All DTW → SJU flights | 80.6% | 0.25% | -3 min | 4.3% | 1,203 |
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – July 2026
Why DL1913 runs late
Where US DOT attributed the delay minutes on this flight.
crew, maintenance, boarding and fueling, all within the carrier’s control
airspace and airport capacity, including weather-driven flow control
the inbound aircraft was late, so this flight started late
weather severe enough to stop this flight specifically
Share of the delay minutes US DOT attributed to each cause for DL1913 on DTW → SJU. Only delays of 15 minutes or more are attributed.
Source: US DOT Bureau of Transportation Statistics · Data covering July 2023 – July 2026
Does a late aircraft delay this flight?
How often the plane that flies DL1913 comes in late, and what that does to the departure.
The aircraft flying DL1913 came in 15 or more minutes late on 15% of the departures where its previous flight is known. There are not enough departures in both groups to say how the flight left after a late one and after an on-time one.
Each departure is matched to the flight the same aircraft flew into DTW just before it, using the tail number in the DOT file, 687 of 897 departures in all. A departure is left out when that flight is unknown, was cancelled or diverted, or the aircraft had sat for more than 12 hours. A flight the airline cancelled never left and is not in the count, and one flown by a substitute aircraft is matched to the aircraft that flew it, not to the one first planned.
Against the network at the same turn length
| Share of departures | Inbound landed 15+ late |
|---|---|
| DL1913 | 15% |
| Network, same turn | 23% |
The schedule leaves a long gap on the ground, which gives a late aircraft room to catch up before this flight pushes back.
The network row is every flight with a scheduled turn of 90 minutes to 3 hours. How often DL1913’s aircraft landed 15 or more minutes late is lower than the network’s. There are not enough departures in both groups to compare how it left.
More: Which Flight Numbers Pay for a Late Aircraft lists the flight numbers that pass a late aircraft on.
Source: US DOT Bureau of Transportation Statistics · Data covering July 2023 – July 2026
From pushback to gate
When it leaves DTW late, does that still matter by the time it reaches SJU?
On arrival at SJU, DL1913 spends 7.1 min taxiing from touchdown to the gate — ground time a connecting passenger sits through before they can even leave the aircraft, on top of however late the flight itself ran. That is about what any arrival at SJU spends on the ground before reaching the gate.
Departure delay is averaged over every pushback and arrival delay over every completed arrival, so the two counts differ by the flights that never reached SJU. Taxi-out is gate to wheels up and sits inside the scheduled block rather than on top of it; the comparison is 46,448 departures from DTW scheduled in the clock hour DL1913 most often leaves in. Taxi-in is landing to gate, compared against every arrival FlyerIntel has on file at SJU (109,607 flights), not just DL1913’s own. More on taxi time.
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – July 2026
The hour it leaves DTW
Part of any flight’s record belongs to the clock rather than to the flight. DL1913 has one departure time, so this is what that time is worth.
On-time arrival rate. 46,448 departures from DTW are scheduled in the 8 AM–9 AM hour over the period, against 388,632 across the whole day.
DL1913 is scheduled out of DTW at 8:35 AM, in the 8 AM–9 AM bank. Departures from DTW in that hour arrive on time 85.1% of the time against 79.6% across the airport’s whole day — the slot alone is worth 5.6 points better before anything about this particular flight is considered.
The two airport figures cover every departure from DTW to every destination, so they describe the slot rather than this journey — the like-for-like comparison against the route is above. Hours are scheduled local, and a number whose schedule moved between banks inside the period has no single hour and is not described here at all. Why the hour matters.
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – July 2026 · Hours below 120 departures are not scored.
By day of week
Does DL1913 run worse on particular days?
Saturday is historically the most reliable day and Monday the least, a gap of 8.1 percentage points.
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – July 2026 · Days with fewer than 120 operations are not scored.
Other routes DL1913 has flown
A flight number is a slot in a schedule, and carriers reassign it. These are the other city pairs this number served in the analysis period.
| Route | Operated | Flights | On time |
|---|---|---|---|
| SJU→DTW San Juan to Detroit | July 1, 2023 – July 31, 2026 | 899 | 82.5% |
| ATL→DAY Atlanta to Dayton | October 14, 2023 – November 4, 2023 | 4 | — |
| DAY→ATL Dayton to Atlanta | October 14, 2023 – November 4, 2023 | 4 | — |
Because the same number has served different journeys, the statistics above describe only the route DL1913 currently operates. Blending them would produce an average of two different flights.
When it goes wrong
The average describes a usual day. This is the day that ruins a connection.
31 min late
against a median of 2 min early
Percentiles over 899 operations; cancelled and diverted flights are counted separately.
Source: US DOT Bureau of Transportation Statistics · Data covering July 2023 – July 2026
Data and methodology
Calculated by FlyerIntel from 899 records of DL1913 operating DTW → SJU, published by the US DOT Bureau of Transportation Statistics. A flight counts as delayed when it arrives 15 or more minutes after schedule. Cancelled and diverted flights are excluded from the on-time rate and reported separately. Flight numbers are resolved as carrier plus number plus route, because the same number serves different routes over time.
Full methodology · Data sources · Report a problem
Related research: Most and Least Reliable Flight Numbers · The Delay You Inherit · Making Up Time in the Air
Analysis last recomputed