Flight number record

DL 329

Delta Air Lines · Atlanta to Santa Ana

Route: ATL → SNA
Departs: 09:50
Flights: 334
Period: September 2025 to August 2026

Historical statistics for September 2025 to August 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 77.3%. The late ones land roughly 55 minutes behind schedule. That rests on 334 flights, with a median arrival 1 minute late.

On time

74.3%

Arrivals under 15 minutes late, of 331 completed flights

Avg delay

53 min

Across delayed arrivals only, not all flights

Cancelled

0.90%

National rate is 1.89%

1 hour+ late

8.2%

National rate is 8.3%

These figures cover 334 flights between September 2025 and August 2026. Beyond the headline rate, 8.2% of arrivals land a full hour or more behind schedule, against 8.3% nationally.

Fare search by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.

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 11:00 (57 flights) and 09:40 (55 flights) next.

Departs 09:5062 flights18.6%
Departs 11:0057 flights17.1%
Departs 09:4055 flights16.5%

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 09:50 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and DL 329 runs 10 points worse at 74.3%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.

Timetable by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.

Against the route

DL 329 next to ATL to SNA

Every carrier on ATL to SNA combined arrived on time 76.0% of the time across 1,020 flights, so DL 329 is 2 points behind it. Across its whole network Delta Air Lines managed 81.1%, 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	74.3%	53 min	0.90%	C+
All Delta Air Lines on ATL–SNA	1,020	76.0%	51 min	0.88%	B+
All carriers on ATL–SNA	1,020	76.0%	51 min	0.88%	B+
Delta Air Lines, whole network	1,039,517	81.1%	71 min	1.74%	B

Across the year

DL 329 quarter by quarter

DL 329 did not run the same all year. Its best quarter was Apr–Jun 2026 at 80.0% on time and its weakest Jul–Sep 2025 at 66.7%, a swing of 13 points on roughly 67 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 flights66.7%
Oct–Dec 202592 flights71.7%
Jan–Mar 202690 flights77.0%
Apr–Jun 202660 flights80.0%
Jul–Sep 202662 flights72.6%

Scale runs 60% to 85%.

By weekday, DL 329 did best on Saturday at 80.4% on time and worst on Friday at 66.0%. Each day rests on about 48 flights, so a gap of 14 points is worth noticing but could still narrow in another year.

Arrival by arrival

How late DL 329 runs when it is late

The 85 late arrivals split 40 under half an hour, 18 between 30 and 60 minutes, and 27 an hour or more.

15+ min early64 flights19.3%
Within 15 min182 flights55.0%
15–29 min late40 flights12.1%
30–59 min late18 flights5.4%
1–2 hours late22 flights6.6%
2+ hours late5 flights1.5%

Scale runs 0% to 100%.

Share of 331 completed flights by arrival against schedule.

10 of 59 late departures made up the time and arrived on time, 17% of them. In the other direction, 36 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at SNA.

The worst days

Worst days for DL 329

The latest arrival of the period was on 4 August 2026, 6 hours 47 minutes behind schedule; most of its delay minutes were filed as national airspace system delay. The five worst days are spread across August, April, December and July, with no single month standing out.

The latest arrivals of DL 329 in the period
Date	Arrived late by	Largest filed cause
4 August 2026	6 hours 47 minutes	National Airspace System
28 April 2026	3 hours 57 minutes	Late-arriving aircraft
27 December 2025	3 hours 6 minutes	Carrier
7 December 2025	2 hours 33 minutes	Extreme weather
15 July 2026	2 hours 24 minutes	Late-arriving aircraft

Delay causes

Why DL 329 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 4,498 reported delay minutes.

Carrier
40%
National Airspace System
34%
Late-arriving aircraft
22%
Extreme weather
3%

The largest share of delay minutes, 40%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 1,814 of the 4,498 delay minutes reported here. The split is drawn from 4,498 delay minutes reported on DL 329.

Cancellations sit at 0.90% against a national 1.89%, which is ordinary. Diversions add another 0.00%.

Connections and routes

What a delay on this flight costs

8.2% 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 roughly 55 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 (239), 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 74.3% on time with 0.90% 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, September 2025 to August 2026. Last updated 22 October 2026; recomputed monthly. How this data is collected.

Key figures