Flight number record

DL 1946

Delta Air Lines · San Juan to Atlanta

Route: SJU → ATL
Departs: 17:43
Flights: 365
Period: September 2025 to August 2026

Historical statistics for September 2025 to August 2026, not live status. For today’s DL 1946, check with Delta Air Lines.

DL 1946 earns an A+. Close to nine flights in ten arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 11 points better than the national rate of 77.3%. When something does go wrong the average delay runs a little over an hour. That rests on 365 flights, with a median arrival 15 minutes early.

Set against the rest of the country, DL 1946's record is 11 points better than the US average of 77.3%. That gap is worth roughly 108 fewer late arrivals for every thousand flights.

On time

88.1%

Arrivals under 15 minutes late, of 361 completed flights

Avg delay

80 min

Across delayed arrivals only, not all flights

Cancelled

0.55%

National rate is 1.89%

1 hour+ late

5.3%

National rate is 8.3%

These figures cover 365 flights between September 2025 and August 2026. The median arrival is 15 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 1946 flies

DL 1946 flies SJU to ATL without a single fixed slot. Its most common scheduled departure was 17:43, used on 58 of 365 flights.

Departs 17:4358 flights15.9%

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 17:43 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.0%, and DL 1946 runs 20 points better at 88.1%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.

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Against the route

DL 1946 next to SJU to ATL

Every carrier on SJU to ATL combined arrived on time 81.6% of the time across 2,097 flights, so DL 1946 is 7 points ahead of it. Delta flew 1,638 flights on the same city pair under all its flight numbers, including this one, and those ran 90.9% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight beats by 7 points.

DL 1946 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 1946	365	88.1%	80 min	0.55%	A+
All Delta Air Lines on SJU–ATL	1,638	90.9%	78 min	0.85%	A+
All carriers on SJU–ATL	2,097	81.6%	80 min	1.34%	B
Delta Air Lines, whole network	1,039,517	81.1%	71 min	1.74%	B

Across the year

DL 1946 quarter by quarter

Quarter by quarter DL 1946 held fairly steady: 93.3% in Jul–Sep 2025, 89.0% in Oct–Dec 2025, 84.1% in Jan–Mar 2026, 90.1% in Apr–Jun 2026 and 86.9% in Jul–Sep 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 202530 flights93.3%
Oct–Dec 202592 flights89.0%
Jan–Mar 202690 flights84.1%
Apr–Jun 202691 flights90.1%
Jul–Sep 202662 flights86.9%

Scale runs 75% to 100%.

By weekday, DL 1946 did best on Wednesday at 98.1% on time and worst on Sunday at 80.8%. Each day rests on about 52 flights, so a gap of 17 points is worth noticing but could still narrow in another year.

Arrival by arrival

How late DL 1946 runs when it is late

DL 1946 often beats the schedule: 185 of 361 completed flights, 51%, arrived 15 minutes or more early. The 43 late arrivals split 13 under half an hour, 11 between 30 and 60 minutes, and 19 an hour or more.

15+ min early185 flights51.2%
Within 15 min133 flights36.8%
15–29 min late13 flights3.6%
30–59 min late11 flights3.0%
1–2 hours late15 flights4.2%
2+ hours late4 flights1.1%

Scale runs 0% to 100%.

Share of 361 completed flights by arrival against schedule.

A late pushback is often recovered here: of 56 departures that left 15 minutes late or more, 20 still arrived on time. Only 7 left on time and still arrived late.

The worst days

Worst days for DL 1946

The latest arrival of the period was on 15 November 2025, 15 hours 32 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 1946 in the period
Date	Arrived late by	Largest filed cause
15 November 2025	15 hours 32 minutes	Carrier
1 January 2026	3 hours 20 minutes	Carrier
26 January 2026	2 hours 21 minutes	Late-arriving aircraft
28 April 2026	2 hours 3 minutes	Late-arriving aircraft
13 April 2026	1 hour 46 minutes	Late-arriving aircraft

Delay causes

Why DL 1946 runs late

Late-arriving aircraft accounts for 60% of the 3,439 delay minutes carriers reported here, and the remaining four split what is left.

Late-arriving aircraft
60%
Carrier
33%
National Airspace System
8%

60% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 3,439 reported delay minutes here, that single category outweighs weather by 60 to one. The split is drawn from 3,439 delay minutes reported on DL 1946.

Cancellations are rare at 0.55%, 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

5.3% 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.

At 1,547 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 1946 is not only a SJU to ATL flight. It also flew ATL to SJU (365 flights, 81.8% 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. 365 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 1946
Also flown as	Flights	On time	Avg delay	Cancelled	Grade
ATL to SJU	365	81.8%	61 min	0.55%	B+

What to do with this

Booking DL 1946

For a booking, DL 1946 has one of the better records a US domestic flight can show: 88.1% on time and 0.55% cancelled. That is a base rate, not a promise about any single 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, September 2025 to August 2026. Last updated 22 October 2026; recomputed monthly. How this data is collected.

Key figures