Flight number record

DL 329

Delta Air Lines · Atlanta to Santa Ana

Route: ATL → SNA
Departs: 09:50
Flights: 334
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s DL 329, check with Delta Air Lines.

DL 329 sits in the middle of the pack with a C. Close to three flights in four arrive on time by the DOT's definition, 3 points worse than the national rate of 77.6%. The late ones land roughly 50 minutes behind schedule. That rests on 334 flights, with a median arrival right on schedule.

On time

74.8%

Arrivals under 15 minutes late, of 329 completed flights

Avg delay

48 min

Across delayed arrivals only, not all flights

Cancelled

1.20%

National rate is 1.81%

1 hour+ late

7.3%

National rate is 8.1%

These figures cover 334 flights between July 2025 and June 2026. On-time means an arrival less than 15 minutes after the scheduled gate time, the same threshold the Department of Transportation uses in its own reports. Cancelled and diverted flights are excluded from the on-time rate and counted separately, which is why the cancellation column matters on its own.

Schedule

When DL 329 flies

DL 329 flies ATL to SNA without a single fixed slot. Its most common scheduled departure was 09:50, used on 62 of 334 flights, with 09:29 (61 flights) and 09:40 (55 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 09:5062 flights18.6%
Departs 09:2961 flights18.3%
Departs 09:4055 flights16.5%

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 09:50 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 84.1%, and DL 329 runs 9 points worse at 74.8%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.

Against the route

DL 329 next to ATL to SNA

Every carrier on ATL to SNA combined arrived on time 75.4% of the time across 1,047 flights, so DL 329 is about level with it. Across its whole network Delta Air Lines managed 81.6%, which this flight trails by 7 points.

DL 329 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 329thin sample	334	74.8%	48 min	1.20%	C
All Delta Air Lines on ATL–SNA	1,047	75.4%	52 min	0.96%	B+
All carriers on ATL–SNA	1,047	75.4%	52 min	0.96%	B+
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	B

Across the year

DL 329 quarter by quarter

Quarter by quarter DL 329 held fairly steady: 72.2% in Jul–Sep 2025, 71.7% in Oct–Dec 2025, 77.0% in Jan–Mar 2026 and 80.0% in Apr–Jun 2026. A spread of 8 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202592 flights72.2%
Oct–Dec 202592 flights71.7%
Jan–Mar 202690 flights77.0%
Apr–Jun 202660 flights80.0%

Scale runs 65% to 85%. Rows with fewer than 30 flights show a dash.

By weekday, DL 329 did best on Tuesday at 81.6% on time and worst on Thursday at 66.0%. Each day rests on about 48 flights, so a gap of 16 points is worth noticing but could still narrow in another year.

Delay causes

Why DL 329 runs late

One category carries most of the weight here. Carrier accounts for 43% of the 3,988 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.

Carrier
43%
National Airspace System
32%
Late-arriving aircraft
21%
Extreme weather
4%

The largest share of delay minutes, 43%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 1,723 of the 3,988 delay minutes reported here. The split is drawn from 3,988 delay minutes reported on DL 329.

Cancellations sit at 1.20% against a national 1.81%, which is ordinary. Diversions add another 0.30%.

Connections and routes

What a delay on this flight costs

7.3% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last roughly 50 minutes, which a normal layover absorbs.

At 1,919 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 one other city pair in the data, including SNA to ATL (231), but none flew often enough under DL 329 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to ATL to SNA only.

One caution: this is a thin sample. 334 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 329

For a booking, read DL 329 as 74.8% on time with 1.20% cancelled over 334 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