Flight number record

DL 764

Delta Air Lines · San Diego to Detroit

Route: SAN → DTW
Departs: 22:15
Flights: 330
Period: September 2025 to August 2026

Historical statistics for September 2025 to August 2026, not live status. For today’s DL 764, check with Delta Air Lines.

DL 764 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 about 35 minutes. That rests on 330 flights, with a median arrival 11 minutes early.

Set against the rest of the country, DL 764's record is 11 points better than the US average of 77.3%. That gap is worth roughly 114 fewer late arrivals for every thousand flights.

On time

88.7%

Arrivals under 15 minutes late, of 326 completed flights

Avg delay

34 min

Across delayed arrivals only, not all flights

Cancelled

1.21%

National rate is 1.89%

1 hour+ late

0.6%

National rate is 8.3%

These figures cover 330 flights between September 2025 and August 2026. The median arrival is 11 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 764 flies

DL 764 flies SAN to DTW without a single fixed slot. Its most common scheduled departure was 22:15, used on 91 of 330 flights, with 22:10 (83 flights) and 22:00 (79 flights) next.

Departs 22:1591 flights27.6%
Departs 22:1083 flights25.2%
Departs 22:0079 flights23.9%

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 22:15 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.1%, and DL 764 runs 19 points better at 88.7%. 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 764 next to SAN to DTW

Every carrier on SAN to DTW combined arrived on time 85.9% of the time across 1,269 flights, so DL 764 is 3 points ahead of it. Delta flew 1,250 flights on the same city pair under all its flight numbers, including this one, and those ran 86.1% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight beats by 8 points.

DL 764 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 764thin sample	330	88.7%	34 min	1.21%	A
All Delta Air Lines on SAN–DTW	1,250	86.1%	52 min	0.80%	A+
All carriers on SAN–DTW	1,269	85.9%	53 min	0.87%	A+
Delta Air Lines, whole network	1,039,517	81.1%	71 min	1.74%	B

Across the year

DL 764 quarter by quarter

DL 764 did not run the same all year. Its best quarter was Oct–Dec 2025 at 94.5% on time and its weakest Jul–Sep 2026 at 78.3%, a swing of 16 points on roughly 83 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 202525 flights—
Oct–Dec 202592 flights94.5%
Jan–Mar 202690 flights85.4%
Apr–Jun 202677 flights89.5%
Jul–Sep 202646 flights78.3%

Scale runs 70% to 100%. Rows with fewer than 30 flights show a dash.

By weekday, DL 764 did best on Tuesday at 97.2% on time and worst on Thursday at 80.4%. Each day rests on about 47 flights, so a gap of 17 points is worth noticing but could still narrow in another year.

Arrival by arrival

How late DL 764 runs when it is late

DL 764 often beats the schedule: 140 of 326 completed flights, 43%, arrived 15 minutes or more early. The 37 late arrivals split 18 under half an hour, 17 between 30 and 60 minutes, and 2 an hour or more. Not one arrived two hours late.

15+ min early140 flights42.9%
Within 15 min149 flights45.7%
15–29 min late18 flights5.5%
30–59 min late17 flights5.2%
1–2 hours late2 flights0.6%
2+ hours late0 flights0.0%

Scale runs 0% to 100%.

Share of 326 completed flights by arrival against schedule.

7 of 26 late departures made up the time and arrived on time, 27% of them. In the other direction, 18 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 DTW.

The worst days

Worst days for DL 764

The latest arrival of the period was on 23 March 2026, 1 hour 45 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). Three of the five worst days fell in March 2026.

The latest arrivals of DL 764 in the period
Date	Arrived late by	Largest filed cause
23 March 2026	1 hour 45 minutes	Carrier
14 April 2026	1 hour 7 minutes	Carrier
21 March 2026	58 minutes	Carrier
11 March 2026	54 minutes	Late-arriving aircraft
18 September 2025	49 minutes	Carrier

Delay causes

Why DL 764 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 1,260 reported delay minutes.

National Airspace System
39%
Carrier
37%
Late-arriving aircraft
23%
Extreme weather
1%

39% of delay minutes are charged to the National Airspace System: air traffic volume, runway configuration, ground stops. No carrier can price its way out of that, which is why airport choice moves the number here more than carrier choice does. That is 494 minutes out of 1,260, against a national NAS share of 21%. The split is drawn from 1,260 delay minutes reported on DL 764.

Cancellations sit at 1.21% 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 0.6% 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 1,956 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.

Every one of the 330 flights under DL 764 in the data flew SAN to DTW. The number was not reused on any other city pair, which makes this a clean record of one route.

One caution: this is a thin sample. 330 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 764

For a booking, DL 764 has one of the better records a US domestic flight can show: 88.7% on time and 1.21% 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