Flight number record
DL 2508
Delta Air Lines · Seattle to San Diego
- Route
- SEA → SAN
- Departs
- 07:15
- Flights
- 349
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 2508, check with Delta Air Lines.
DL 2508 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 77.3%. When something does go wrong the average delay runs roughly 55 minutes. That rests on 349 flights, with a median arrival 12 minutes early.
Set against the rest of the country, DL 2508's record is 13 points better than the US average of 77.3%. That gap is worth roughly 126 fewer late arrivals for every thousand flights.
Key figures
On time
89.9%
Arrivals under 15 minutes late, of 345 completed flights
Avg delay
53 min
Across delayed arrivals only, not all flights
Cancelled
0.57%
National rate is 1.89%
1 hour+ late
2.9%
National rate is 8.3%
These figures cover 349 flights between September 2025 and August 2026. The median arrival is 12 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 2508 flies
DL 2508 flies SEA to SAN without a single fixed slot. Its most common scheduled departure was 07:15, used on 150 of 349 flights, with 07:10 (109 flights) and 07:20 (36 flights) next.
- Departs 07:15150 flights43.0%
- Departs 07:10109 flights31.2%
- Departs 07:2036 flights10.3%
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 07:15 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and DL 2508 runs level with that at 89.9%. 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 2508 next to SEA to SAN
Every carrier on SEA to SAN combined arrived on time 75.0% of the time across 4,647 flights, so DL 2508 is 15 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 81.1% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight beats by 9 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 2508thin sample | 349 | 89.9% | 53 min | 0.57% | A+ |
| All Delta Air Lines on SEA–SAN | 1,710 | 81.1% | 51 min | 0.94% | B+ |
| All carriers on SEA–SAN | 4,647 | 75.0% | 47 min | 0.90% | B+ |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 2508 quarter by quarter
DL 2508 did not run the same all year. Its best quarter was Apr–Jun 2026 at 94.4% on time and its weakest Oct–Dec 2025 at 84.1%, a swing of 10 points on roughly 87 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 flights—
- Oct–Dec 202582 flights84.1%
- Jan–Mar 202684 flights90.2%
- Apr–Jun 202691 flights94.4%
- Jul–Sep 202662 flights87.1%
Scale runs 75% to 100%. Rows with fewer than 30 flights show a dash.
By weekday, DL 2508 did best on Tuesday at 98.1% on time and worst on Thursday at 84.0%. Each day rests on about 50 flights, so a gap of 14 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 2508 runs when it is late
DL 2508 often beats the schedule: 144 of 345 completed flights, 42%, arrived 15 minutes or more early. The 35 late arrivals split 14 under half an hour, 11 between 30 and 60 minutes, and 10 an hour or more.
- 15+ min early144 flights41.7%
- Within 15 min166 flights48.1%
- 15–29 min late14 flights4.1%
- 30–59 min late11 flights3.2%
- 1–2 hours late7 flights2.0%
- 2+ hours late3 flights0.9%
Scale runs 0% to 100%.
Share of 345 completed flights by arrival against schedule.
5 of 27 late departures made up the time and arrived on time, 19% of them. 13 flights left on time and still arrived late.
The worst days
Worst days for DL 2508
The latest arrival of the period was on 21 March 2026, 4 hours 13 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on four of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 21 March 2026 | 4 hours 13 minutes | Carrier |
| 7 March 2026 | 2 hours 34 minutes | Carrier |
| 6 October 2025 | 2 hours 5 minutes | Carrier |
| 13 November 2025 | 1 hour 57 minutes | Carrier |
| 21 November 2025 | 1 hour 22 minutes | National Airspace System |
Delay causes
Why DL 2508 runs late
Carrier accounts for 63% of the 1,840 delay minutes carriers reported here, and the remaining four split what is left.
- 63%Carrier
- 29%National Airspace System
- 4%Late-arriving aircraft
- 4%Extreme weather
The largest share of delay minutes, 63%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 1,152 of the 1,840 delay minutes reported here. The split is drawn from 1,840 delay minutes reported on DL 2508.
Cancellations are rare at 0.57%, 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 2.9% 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.
DL 2508 is not only a SEA to SAN flight. It also flew SAN to SEA (349 flights, 90.5% on time) often enough to be scored on its own. Airlines attach one number to several legs of an aircraft's day, and each leg keeps its own record here, so check which city pair is on your booking before reading a rate.
One caution: this is a thin sample. 349 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.
| Also flown as | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| SAN to SEAthin sample | 349 | 90.5% | 80 min | 0.86% | A+ |
What to do with this
Booking DL 2508
For a booking, DL 2508 has one of the better records a US domestic flight can show: 89.9% on time and 0.57% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- SEA to SAN, every carrier and departure
- SAN to SEA, the return direction
- Delta Air Lines 2572 on the same route81.6%
- Delta Air Lines 2672 on the same route74.1%
- Delta Air Lines 2533 on the same route77.4%
- Delta Air Lines 2613 on the same route82.5%
- Seattle-Tacoma International (SEA) delay statistics
- San Diego International (SAN) 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.