Flight number record

DL 1946

Delta Air Lines · San Juan to Atlanta

Route: SJU → ATL
Departs: 17:43
Flights: 365
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 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 77.6%. 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 77.6%. That gap is worth roughly 105 fewer late arrivals for every thousand flights.

On time

88.1%

Arrivals under 15 minutes late, of 362 completed flights

Avg delay

74 min

Across delayed arrivals only, not all flights

Cancelled

0.55%

National rate is 1.81%

1 hour+ late

4.1%

National rate is 8.1%

These figures cover 365 flights between July 2025 and June 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.

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. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 17:4358 flights15.9%

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 17:43 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.2%, 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.

Against the route

DL 1946 next to SJU to ATL

Every carrier on SJU to ATL combined arrived on time 82.0% of the time across 2,126 flights, so DL 1946 is 6 points ahead of it. Delta flew 1,637 flights on the same city pair under all its flight numbers, including this one, and those ran 90.8% on time. Across its whole network Delta Air Lines managed 81.6%, 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%	74 min	0.55%	A+
All Delta Air Lines on SJU–ATL	1,637	90.8%	81 min	0.92%	A+
All carriers on SJU–ATL	2,126	82.0%	82 min	1.36%	B
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	B

Across the year

DL 1946 quarter by quarter

Quarter by quarter DL 1946 held fairly steady: 89.1% in Jul–Sep 2025, 89.0% in Oct–Dec 2025, 84.1% in Jan–Mar 2026 and 90.1% in Apr–Jun 2026. A spread of 6 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202592 flights89.1%
Oct–Dec 202592 flights89.0%
Jan–Mar 202690 flights84.1%
Apr–Jun 202691 flights90.1%

Scale runs 75% to 95%. Rows with fewer than 30 flights show a dash.

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.

Delay causes

Why DL 1946 runs late

One category carries most of the weight here. Late-arriving aircraft accounts for 52% of the 3,191 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
52%
Carrier
39%
National Airspace System
9%
Extreme weather
0%

52% 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 3,191 reported delay minutes here, that single category outweighs weather by 52 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 3,191 delay minutes reported on DL 1946.

Cancellations are rare at 0.55%, below the national 1.81% 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 4.1% 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 1,547 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%	54 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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.

Key figures