Flight number record

DL 2530

Delta Air Lines · San Diego to Seattle

Route: SAN → SEA
Departs: 07:30
Flights: 365
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s DL 2530, check with Delta Air Lines.

DL 2530 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 13 points better than the national rate of 77.6%. When something does go wrong the average delay runs an hour and a half. That rests on 365 flights, with a median arrival 16 minutes early.

Set against the rest of the country, DL 2530's record is 13 points better than the US average of 77.6%. That gap is worth roughly 133 fewer late arrivals for every thousand flights.

On time

90.9%

Arrivals under 15 minutes late, of 363 completed flights

Avg delay

87 min

Across delayed arrivals only, not all flights

Cancelled

0.27%

National rate is 1.81%

1 hour+ late

3.9%

National rate is 8.1%

These figures cover 365 flights between July 2025 and June 2026. The median arrival is 16 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 2530 flies

DL 2530 flies SAN to SEA without a single fixed slot. Its most common scheduled departure was 07:30, used on 126 of 365 flights, with 07:00 (62 flights) and 06:15 (51 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 07:30126 flights34.5%
Departs 07:0062 flights17.0%
Departs 06:1551 flights14.0%

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 07:30 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and DL 2530 runs level with that at 90.9%. 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 2530 next to SAN to SEA

Every carrier on SAN to SEA combined arrived on time 80.8% of the time across 4,582 flights, so DL 2530 is 10 points ahead of it. Delta flew 1,700 flights on the same city pair under all its flight numbers, including this one, and those ran 87.3% on time. Across its whole network Delta Air Lines managed 81.6%, which this flight beats by 9 points.

DL 2530 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 2530	365	90.9%	87 min	0.27%	A+
All Delta Air Lines on SAN–SEA	1,700	87.3%	76 min	1.06%	A
All carriers on SAN–SEA	4,582	80.8%	64 min	1.66%	B
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	B

Across the year

DL 2530 quarter by quarter

Quarter by quarter DL 2530 held fairly steady: 91.3% in Jul–Sep 2025, 92.3% in Oct–Dec 2025, 93.3% in Jan–Mar 2026 and 86.8% in Apr–Jun 2026. A spread of 7 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202592 flights91.3%
Oct–Dec 202592 flights92.3%
Jan–Mar 202690 flights93.3%
Apr–Jun 202691 flights86.8%

Scale runs 80% to 100%. Rows with fewer than 30 flights show a dash.

By weekday, DL 2530 ranged from 88.2% on Friday to 96.2% on Monday. With about 52 flights behind each day, a spread of 8 points is inside normal variation, so the day you fly is not worth changing for this flight.

Delay causes

Why DL 2530 runs late

One category carries most of the weight here. Carrier accounts for 68% of the 2,862 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
68%
National Airspace System
20%
Late-arriving aircraft
11%

The largest share of delay minutes, 68%, 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 1,957 of the 2,862 delay minutes reported here. The split is drawn from 2,862 delay minutes reported on DL 2530.

Cancellations are rare at 0.27%, 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 3.9% 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.

The 1,050 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.

Every one of the 365 flights under DL 2530 in the data flew SAN to SEA. 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. 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.

What to do with this

Booking DL 2530

For a booking, DL 2530 has one of the better records a US domestic flight can show: 90.9% on time and 0.27% 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