Flight number record
DL 2830
Delta Air Lines · Seattle to Los Angeles
- Route
- SEA → LAX
- Departs
- 13:30
- Flights
- 349
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 2830, check with Delta Air Lines.
DL 2830 lands a B+, 7 points better than the national rate of 77.3%. About one flight in six arrives 15 minutes late or worse, and those flights are late by about an hour on average. That rests on 349 flights, with a median arrival 5 minutes early.
Set against the rest of the country, DL 2830's record is 7 points better than the US average of 77.3%. That gap is worth roughly 65 fewer late arrivals for every thousand flights.
Key figures
On time
83.8%
Arrivals under 15 minutes late, of 346 completed flights
Avg delay
56 min
Across delayed arrivals only, not all flights
Cancelled
0.86%
National rate is 1.89%
1 hour+ late
4.0%
National rate is 8.3%
These figures cover 349 flights between September 2025 and August 2026. The median arrival is 5 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 2830 flies
DL 2830 flies SEA to LAX without a single fixed slot. Its most common scheduled departure was 13:30, used on 50 of 349 flights.
- Departs 13:3050 flights14.3%
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 13:30 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and DL 2830 runs 6 points better at 83.8%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
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Against the route
DL 2830 next to SEA to LAX
Every carrier on SEA to LAX combined arrived on time 82.0% of the time across 7,536 flights, so DL 2830 is 2 points ahead of it. Delta flew 2,229 flights on the same city pair under all its flight numbers, including this one, and those ran 81.6% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight beats by 3 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 2830thin sample | 349 | 83.8% | 56 min | 0.86% | B+ |
| All Delta Air Lines on SEA–LAX | 2,229 | 81.6% | 59 min | 0.58% | B+ |
| All carriers on SEA–LAX | 7,536 | 82.0% | 59 min | 0.81% | B+ |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 2830 quarter by quarter
DL 2830 did not run the same all year. Its best quarter was Jul–Sep 2025 at 93.3% on time and its weakest Jul–Sep 2026 at 79.0%, a swing of 14 points on roughly 70 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 flights93.3%
- Oct–Dec 202580 flights87.3%
- Jan–Mar 202686 flights80.0%
- Apr–Jun 202691 flights84.4%
- Jul–Sep 202662 flights79.0%
Scale runs 70% to 100%.
By weekday, DL 2830 did best on Saturday at 91.8% on time and worst on Thursday at 74.0%. Each day rests on about 50 flights, so a gap of 18 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 2830 runs when it is late
The 56 late arrivals split 25 under half an hour, 17 between 30 and 60 minutes, and 14 an hour or more.
- 15+ min early73 flights21.1%
- Within 15 min217 flights62.7%
- 15–29 min late25 flights7.2%
- 30–59 min late17 flights4.9%
- 1–2 hours late9 flights2.6%
- 2+ hours late5 flights1.4%
Scale runs 0% to 100%.
Share of 346 completed flights by arrival against schedule.
9 of 48 late departures made up the time and arrived on time, 19% of them. 17 flights left on time and still arrived late.
The worst days
Worst days for DL 2830
The latest arrival of the period was on 10 December 2025, 5 hours 15 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on five of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 10 December 2025 | 5 hours 15 minutes | Carrier |
| 4 October 2025 | 4 hours 20 minutes | Carrier |
| 23 March 2026 | 3 hours 2 minutes | Carrier |
| 16 July 2026 | 2 hours 48 minutes | Carrier |
| 14 June 2026 | 2 hours 38 minutes | Carrier |
Delay causes
Why DL 2830 runs late
Carrier accounts for 61% of the 3,142 delay minutes carriers reported here, and the remaining four split what is left.
- 61%Carrier
- 24%Late-arriving aircraft
- 15%National Airspace System
The largest share of delay minutes, 61%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 1,915 of the 3,142 delay minutes reported here. The split is drawn from 3,142 delay minutes reported on DL 2830.
Cancellations are rare at 0.86%, 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 4.0% 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 954 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.
The same number turns up on one other city pair in the data, including SEA to PDX (16), but none flew often enough under DL 2830 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to SEA to LAX only.
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.
What to do with this
Booking DL 2830
For a booking, read DL 2830 as 83.8% on time with 0.86% cancelled over 349 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- SEA to LAX, every carrier and departure
- LAX to SEA, the return direction
- Delta Air Lines 2769 on the same route83.8%
- Delta Air Lines 2861 on the same route74.2%
- Delta Air Lines 1628 on the same route90.6%
- Alaska Airlines 505 on the same route82.8%
- Delta Air Lines 2914 on the same route84.0%
- Delta Air Lines 2854 on the same route74.8%
- Seattle-Tacoma International (SEA) delay statistics
- Los Angeles International (LAX) 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.