Flight number record
DL 1628
Delta Air Lines · Seattle to Los Angeles
- Route
- SEA → LAX
- Departs
- 07:15
- Flights
- 361
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 1628, check with Delta Air Lines.
DL 1628 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 about an hour. That rests on 361 flights, with a median arrival 12 minutes early.
Set against the rest of the country, DL 1628's record is 13 points better than the US average of 77.3%. That gap is worth roughly 133 fewer late arrivals for every thousand flights.
Key figures
On time
90.6%
Arrivals under 15 minutes late, of 361 completed flights
Avg delay
67 min
Across delayed arrivals only, not all flights
Cancelled
0.00%
National rate is 1.89%
1 hour+ late
3.0%
National rate is 8.3%
These figures cover 361 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 1628 flies
DL 1628 flies SEA to LAX without a single fixed slot. Its most common scheduled departure was 07:15, used on 156 of 361 flights, with 07:10 (95 flights) and 07:25 (55 flights) next.
- Departs 07:15156 flights43.2%
- Departs 07:1095 flights26.3%
- Departs 07:2555 flights15.2%
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 1628 runs level with that at 90.6%. 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 1628 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 1628 is 9 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 10 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 1628thin sample | 361 | 90.6% | 67 min | 0.00% | A+ |
| 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 1628 quarter by quarter
DL 1628 did not run the same all year. Its best quarter was Jul–Sep 2025 at 96.7% on time and its weakest Jul–Sep 2026 at 82.3%, a swing of 14 points on roughly 72 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 flights96.7%
- Oct–Dec 202589 flights95.5%
- Jan–Mar 202689 flights86.5%
- Apr–Jun 202691 flights93.4%
- Jul–Sep 202662 flights82.3%
Scale runs 75% to 100%.
By weekday, DL 1628 did best on Wednesday at 98.0% on time and worst on Tuesday at 84.6%. Each day rests on about 52 flights, so a gap of 13 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 1628 runs when it is late
DL 1628 often beats the schedule: 142 of 361 completed flights, 39%, arrived 15 minutes or more early. The 34 late arrivals split 16 under half an hour, 7 between 30 and 60 minutes, and 11 an hour or more.
- 15+ min early142 flights39.3%
- Within 15 min185 flights51.2%
- 15–29 min late16 flights4.4%
- 30–59 min late7 flights1.9%
- 1–2 hours late7 flights1.9%
- 2+ hours late4 flights1.1%
Scale runs 0% to 100%.
Share of 361 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 21 departures that left 15 minutes late or more, only 2 made it up before arrival. 15 flights left on time and still arrived late.
The worst days
Worst days for DL 1628
The latest arrival of the period was on 17 August 2026, 11 hours 3 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 |
|---|---|---|
| 17 August 2026 | 11 hours 3 minutes | Carrier |
| 15 February 2026 | 2 hours 47 minutes | Carrier |
| 13 March 2026 | 2 hours 16 minutes | Extreme weather |
| 31 January 2026 | 2 hours 4 minutes | Carrier |
| 9 July 2026 | 1 hour 48 minutes | Carrier |
Delay causes
Why DL 1628 runs late
Carrier accounts for 78% of the 2,262 delay minutes carriers reported here, and the remaining four split what is left.
- 78%Carrier
- 17%National Airspace System
- 4%Extreme weather
- 2%Late-arriving aircraft
The largest share of delay minutes, 78%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 1,766 of the 2,262 delay minutes reported here. The split is drawn from 2,262 delay minutes reported on DL 1628.
Cancellations are rare at 0.00%, below the national 1.89% and low enough to earn the plus on the grade. Almost no flights are 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 3.0% 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.
Every one of the 361 flights under DL 1628 in the data flew SEA to LAX. 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. 361 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 1628
For a booking, DL 1628 has one of the better records a US domestic flight can show: 90.6% on time and 0.00% cancelled. That is a base rate, not a promise about any single 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 2830 on the same route83.8%
- 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.