Flight number record
DL 1045
Delta Air Lines · Los Angeles to Seattle
- Route
- LAX → SEA
- Departs
- 11:50
- Flights
- 323
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 1045, check with Delta Air Lines.
DL 1045 earns an A+. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 10 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 323 flights, with a median arrival 14 minutes early.
Set against the rest of the country, DL 1045's record is 10 points better than the US average of 77.3%. That gap is worth roughly 96 fewer late arrivals for every thousand flights.
Key figures
On time
86.9%
Arrivals under 15 minutes late, of 321 completed flights
Avg delay
83 min
Across delayed arrivals only, not all flights
Cancelled
0.62%
National rate is 1.89%
1 hour+ late
5.3%
National rate is 8.3%
These figures cover 323 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 1045 flies
DL 1045 flies LAX to SEA without a single fixed slot. Its most common scheduled departure was 11:50, used on 46 of 323 flights, with 11:43 (34 flights) next.
- Departs 11:5046 flights14.2%
- Departs 11:4334 flights10.5%
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 11:50 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and DL 1045 runs 9 points better at 86.9%. 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 1045 next to LAX to SEA
Every carrier on LAX to SEA combined arrived on time 85.0% of the time across 7,534 flights, so DL 1045 is 2 points ahead of it. Delta flew 2,228 flights on the same city pair under all its flight numbers, including this one, and those ran 85.2% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight beats by 6 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 1045thin sample | 323 | 86.9% | 83 min | 0.62% | A+ |
| All Delta Air Lines on LAX–SEA | 2,228 | 85.2% | 71 min | 0.67% | A+ |
| All carriers on LAX–SEA | 7,534 | 85.0% | 62 min | 0.84% | A+ |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 1045 quarter by quarter
DL 1045 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 80.6%, a swing of 16 points on roughly 65 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 flights89.8%
- Jan–Mar 202651 flights88.0%
- Apr–Jun 202691 flights84.6%
- Jul–Sep 202662 flights80.6%
Scale runs 70% to 100%.
By weekday, DL 1045 did best on Wednesday at 93.3% on time and worst on Monday at 80.9%. Each day rests on about 46 flights, so a gap of 12 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 1045 runs when it is late
DL 1045 often beats the schedule: 156 of 321 completed flights, 49%, arrived 15 minutes or more early. The 42 late arrivals split 12 under half an hour, 13 between 30 and 60 minutes, and 17 an hour or more.
- 15+ min early156 flights48.6%
- Within 15 min123 flights38.3%
- 15–29 min late12 flights3.7%
- 30–59 min late13 flights4.0%
- 1–2 hours late5 flights1.6%
- 2+ hours late12 flights3.7%
Scale runs 0% to 100%.
Share of 321 completed flights by arrival against schedule.
14 of 52 late departures made up the time and arrived on time, 27% of them. Only 4 left on time and still arrived late.
The worst days
Worst days for DL 1045
The latest arrival of the period was on 27 June 2026, 4 hours 56 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 |
|---|---|---|
| 27 June 2026 | 4 hours 56 minutes | Carrier |
| 5 August 2026 | 4 hours 53 minutes | Carrier |
| 10 October 2025 | 4 hours 28 minutes | Carrier |
| 30 November 2025 | 3 hours 35 minutes | Carrier |
| 18 December 2025 | 3 hours 23 minutes | Late-arriving aircraft |
Delay causes
Why DL 1045 runs late
Carrier accounts for 76% of the 3,481 delay minutes carriers reported here, and the remaining four split what is left.
- 76%Carrier
- 21%Late-arriving aircraft
- 3%National Airspace System
The largest share of delay minutes, 76%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 2,633 of the 3,481 delay minutes reported here. The split is drawn from 3,481 delay minutes reported on DL 1045.
Cancellations are rare at 0.62%, 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
5.3% of arrivals land an hour or more late, close to the national 8.3%, so a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last an hour and a half, which a normal layover absorbs.
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 two other city pairs in the data, including BOS to PHX (16) and SDF to DTW (10), but none flew often enough under DL 1045 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to LAX to SEA only.
One caution: this is a thin sample. 323 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 1045
For a booking, DL 1045 has one of the better records a US domestic flight can show: 86.9% on time and 0.62% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- LAX to SEA, every carrier and departure
- SEA to LAX, the return direction
- Delta Air Lines 2606 on the same route83.1%
- Delta Air Lines 2980 on the same route92.2%
- Delta Air Lines 2640 on the same route81.8%
- Delta Air Lines 1714 on the same route91.7%
- Alaska Airlines 1305 on the same route73.3%
- Frontier Airlines 1177 on the same route83.6%
- Los Angeles International (LAX) 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.