Flight number record
DL 2530
Delta Air Lines · San Diego to Seattle
- Route
- SAN → SEA
- Departs
- 07:30
- Flights
- 365
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 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 14 points better than the national rate of 77.3%. When something does go wrong the average delay runs an hour and a half. That rests on 365 flights, with a median arrival 14 minutes early.
Set against the rest of the country, DL 2530's record is 14 points better than the US average of 77.3%. That gap is worth roughly 136 fewer late arrivals for every thousand flights.
Key figures
On time
90.9%
Arrivals under 15 minutes late, of 362 completed flights
Avg delay
84 min
Across delayed arrivals only, not all flights
Cancelled
0.55%
National rate is 1.89%
1 hour+ late
3.3%
National rate is 8.3%
These figures cover 365 flights between September 2025 and August 2026. The median arrival is 14 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 2530 flies
DL 2530 flies SAN to SEA without a single fixed slot. Its most common scheduled departure was 07:30, used on 70 of 365 flights, with 07:00 (68 flights) and 07:03 (56 flights) next.
- Departs 07:3070 flights19.2%
- Departs 07:0068 flights18.6%
- Departs 07:0356 flights15.3%
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 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.
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Against the route
DL 2530 next to SAN to SEA
Every carrier on SAN to SEA combined arrived on time 81.1% of the time across 4,646 flights, so DL 2530 is 10 points ahead of it. Delta flew 1,710 flights on the same city pair under all its flight numbers, including this one, and those ran 86.6% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight beats by 10 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 2530 | 365 | 90.9% | 84 min | 0.55% | A+ |
| All Delta Air Lines on SAN–SEA | 1,710 | 86.6% | 77 min | 1.11% | A |
| All carriers on SAN–SEA | 4,646 | 81.1% | 63 min | 1.42% | B |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 2530 quarter by quarter
Quarter by quarter DL 2530 held fairly steady: 93.3% in Jul–Sep 2025, 92.3% in Oct–Dec 2025, 93.3% in Jan–Mar 2026, 86.8% in Apr–Jun 2026 and 90.2% in Jul–Sep 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 202530 flights93.3%
- Oct–Dec 202592 flights92.3%
- Jan–Mar 202690 flights93.3%
- Apr–Jun 202691 flights86.8%
- Jul–Sep 202662 flights90.2%
Scale runs 80% to 100%.
By weekday, DL 2530 ranged from 86.3% on Sunday to 94.3% 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.
Arrival by arrival
How late DL 2530 runs when it is late
DL 2530 often beats the schedule: 170 of 362 completed flights, 47%, arrived 15 minutes or more early. The 33 late arrivals split 14 under half an hour, 7 between 30 and 60 minutes, and 12 an hour or more.
- 15+ min early170 flights47.0%
- Within 15 min159 flights43.9%
- 15–29 min late14 flights3.9%
- 30–59 min late7 flights1.9%
- 1–2 hours late6 flights1.7%
- 2+ hours late6 flights1.7%
Scale runs 0% to 100%.
Share of 362 completed flights by arrival against schedule.
4 of 22 late departures made up the time and arrived on time, 18% of them. 15 flights left on time and still arrived late.
The worst days
Worst days for DL 2530
The latest arrival of the period was on 4 October 2025, 15 hours 8 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 4 October 2025 | 15 hours 8 minutes | Carrier |
| 12 October 2025 | 3 hours 49 minutes | Carrier |
| 19 December 2025 | 2 hours 53 minutes | Late-arriving aircraft |
| 21 April 2026 | 2 hours 51 minutes | Carrier |
| 18 September 2025 | 2 hours 32 minutes | Late-arriving aircraft |
Delay causes
Why DL 2530 runs late
Carrier accounts for 71% of the 2,762 delay minutes carriers reported here, and the remaining four split what is left.
- 71%Carrier
- 17%National Airspace System
- 12%Late-arriving aircraft
The largest share of delay minutes, 71%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 1,967 of the 2,762 delay minutes reported here. The split is drawn from 2,762 delay minutes reported on DL 2530.
Cancellations are rare at 0.55%, below the national 1.89% 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 3.3% 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.
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.
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 0.55% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- SAN to SEA, every carrier and departure
- SEA to SAN, the return direction
- Delta Air Lines 2508 on the same route90.5%
- Delta Air Lines 2572 on the same route85.3%
- Delta Air Lines 2533 on the same route81.1%
- Delta Air Lines 2613 on the same route84.5%
- San Diego International (SAN) delay statistics
- Seattle-Tacoma International (SEA) delay statistics
- Delta Air Lines on-time record
- Every Delta Air Lines flight number with a record
- The most and least reliable flight numbers in the US
- Worst months to fly in the US, ranked by the data
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 ; recomputed monthly. How this data is collected.