Flight number record

DL 933

Delta Air Lines · Atlanta to San Jose

Route: ATL → SJC
Departs: 20:59
Flights: 280
Period: September 2025 to August 2026

Historical statistics for September 2025 to August 2026, not live status. For today’s DL 933, check with Delta Air Lines.

DL 933 earns an A. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 8 points better than the national rate of 77.3%. When something does go wrong the average delay runs about an hour. That rests on 280 flights, with a median arrival 7 minutes early.

Set against the rest of the country, DL 933's record is 8 points better than the US average of 77.3%. That gap is worth roughly 78 fewer late arrivals for every thousand flights.

On time

85.1%

Arrivals under 15 minutes late, of 276 completed flights

Avg delay

58 min

Across delayed arrivals only, not all flights

Cancelled

1.43%

National rate is 1.89%

1 hour+ late

2.9%

National rate is 8.3%

These figures cover 280 flights between September 2025 and August 2026. The median arrival is 7 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 933 flies

DL 933 flies ATL to SJC without a single fixed slot. Its most common scheduled departure was 20:59, used on 84 of 280 flights, with 18:59 (35 flights) and 20:54 (29 flights) next.

Departs 20:5984 flights30.0%
Departs 18:5935 flights12.5%
Departs 20:5429 flights10.4%

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 20:59 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.1%, and DL 933 runs 15 points better at 85.1%. 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 933 next to ATL to SJC

Every carrier on ATL to SJC combined arrived on time 85.8% of the time across 898 flights, so DL 933 is about level with it. Across its whole network Delta Air Lines managed 81.1%, which this flight beats by 4 points.

DL 933 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 933thin sample	280	85.1%	58 min	1.43%	A
All Delta Air Lines on ATL–SJC	898	85.8%	58 min	1.22%	A
All carriers on ATL–SJC	898	85.8%	58 min	1.22%	A
Delta Air Lines, whole network	1,039,517	81.1%	71 min	1.74%	B

Across the year

DL 933 quarter by quarter

DL 933 did not run the same all year. Its best quarter was Jul–Sep 2025 at 100.0% on time and its weakest Jul–Sep 2026 at 60.4%, a swing of 40 points on roughly 56 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 202530 flights100.0%
Oct–Dec 202584 flights93.9%
Jan–Mar 202638 flights86.8%
Apr–Jun 202679 flights84.6%
Jul–Sep 202649 flights60.4%

Scale runs 50% to 100%.

By weekday, DL 933 did best on Tuesday at 94.9% on time and worst on Friday at 69.0%. Each day rests on about 40 flights, so a gap of 26 points is worth noticing but could still narrow in another year.

Arrival by arrival

How late DL 933 runs when it is late

Most of the lateness is short. 22 of the 41 late arrivals were under half an hour behind, and 8 reached an hour or more.

15+ min early64 flights23.2%
Within 15 min171 flights62.0%
15–29 min late22 flights8.0%
30–59 min late11 flights4.0%
1–2 hours late4 flights1.4%
2+ hours late4 flights1.4%

Scale runs 0% to 100%.

Share of 276 completed flights by arrival against schedule.

9 of 43 late departures made up the time and arrived on time, 21% of them. 7 flights left on time and still arrived late.

The worst days

Worst days for DL 933

The latest arrival of the period was on 6 August 2026, 11 hours behind schedule; most of its delay minutes were filed as extreme weather. The five worst days are spread across August, July and May, with no single month standing out.

The latest arrivals of DL 933 in the period
Date	Arrived late by	Largest filed cause
6 August 2026	11 hours	Extreme weather
27 July 2026	2 hours 24 minutes	Late-arriving aircraft
6 May 2026	2 hours 23 minutes	Carrier
24 July 2026	2 hours 3 minutes	Late-arriving aircraft
19 May 2026	1 hour 46 minutes	Carrier

Delay causes

Why DL 933 runs late

Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 2,361 reported delay minutes.

Carrier
38%
Extreme weather
33%
Late-arriving aircraft
22%
National Airspace System
7%

Extreme weather accounts for 33% of delay minutes, well above the single-digit share typical across the system. Weather delays are lumpy: they arrive as whole bad days rather than as a steady drag, so the quarterly figures above are the more useful view of the risk. The national share is 6%, so this operation carries roughly 5.5 times the usual weather exposure. The split is drawn from 2,361 delay minutes reported on DL 933.

Cancellations sit at 1.43% against a national 1.89%, which is ordinary. Diversions add another 0.00%.

Connections and routes

What a delay on this flight costs

Badly late arrivals are rare here: only 2.9% 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 2,116 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.

The same number turns up on two other city pairs in the data, including MSY to LAX (36) and ATL to SLC (4), but none flew often enough under DL 933 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to ATL to SJC only.

One caution: this is a thin sample. 280 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.

What to do with this

Booking DL 933

For a booking, DL 933 has one of the better records a US domestic flight can show: 85.1% on time and 1.43% 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