Flight number record

DL 1913

Delta Air Lines · San Juan to Detroit

Route: SJU → DTW
Departs: 15:20
Flights: 307
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s DL 1913, check with Delta Air Lines.

DL 1913 earns a B. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 7 points better than the national rate of 77.6%. When something does go wrong the average delay runs roughly 50 minutes. That rests on 307 flights, with a median arrival 9 minutes early.

Set against the rest of the country, DL 1913's record is 7 points better than the US average of 77.6%. That gap is worth roughly 71 fewer late arrivals for every thousand flights.

On time

84.7%

Arrivals under 15 minutes late, of 301 completed flights

Avg delay

51 min

Across delayed arrivals only, not all flights

Cancelled

1.63%

National rate is 1.81%

1 hour+ late

3.3%

National rate is 8.1%

These figures cover 307 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 1913 flies

DL 1913 flies SJU to DTW without a single fixed slot. Its most common scheduled departure was 15:20, used on 60 of 307 flights, with 14:35 (37 flights) and 14:07 (36 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 15:2060 flights19.5%
Departs 14:3537 flights12.1%
Departs 14:0736 flights11.7%

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 15:20 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 72.4%, and DL 1913 runs 12 points better at 84.7%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Against the route

DL 1913 next to SJU to DTW

Every carrier on SJU to DTW combined arrived on time 83.2% of the time across 384 flights, so DL 1913 is 2 points ahead of it. Across its whole network Delta Air Lines managed 81.6%, which this flight beats by 3 points.

DL 1913 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 1913thin sample	307	84.7%	51 min	1.63%	B
All Delta Air Lines on SJU–DTWthin sample	324	83.6%	50 min	1.85%	B
All carriers on SJU–DTW	384	83.2%	50 min	1.82%	B
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	B

Across the year

DL 1913 quarter by quarter

Quarter by quarter DL 1913 held fairly steady: 87.7% in Jul–Sep 2025, 83.6% in Oct–Dec 2025, 79.5% in Jan–Mar 2026 and 88.8% in Apr–Jun 2026. A spread of 9 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202557 flights87.7%
Oct–Dec 202569 flights83.6%
Jan–Mar 202690 flights79.5%
Apr–Jun 202691 flights88.8%

Scale runs 70% to 95%. Rows with fewer than 30 flights show a dash.

By weekday, DL 1913 ranged from 82.4% on Monday to 88.0% on Friday. With about 44 flights behind each day, a spread of 6 points is inside normal variation, so the day you fly is not worth changing for this flight.

Delay causes

Why DL 1913 runs late

One category carries most of the weight here. Late-arriving aircraft accounts for 75% of the 2,366 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.

Late-arriving aircraft
75%
National Airspace System
13%
Carrier
12%

75% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 2,366 reported delay minutes here, that single category outweighs weather by 75 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 2,366 delay minutes reported on DL 1913.

Cancellations sit at 1.63% against a national 1.81%, which is ordinary. Diversions add another 0.33%.

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.

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 SJU to DTW flight. It also flew DTW to SJU (307 flights, 74.9% 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. 307 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 1913
Also flown as	Flights	On time	Avg delay	Cancelled	Grade
DTW to SJUthin sample	307	74.9%	49 min	0.65%	C+

What to do with this

Booking DL 1913

For a booking, read DL 1913 as 84.7% on time with 1.63% cancelled over 307 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