Flight number record

DL 1045

Delta Air Lines · Los Angeles to Seattle

Route: LAX → SEA
Departs: 11:50
Flights: 323
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s DL 1045, check with Delta Air Lines.

DL 1045 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 11 points better than the national rate of 77.6%. When something does go wrong the average delay runs a little over an hour. That rests on 323 flights, with a median arrival 16 minutes early.

Set against the rest of the country, DL 1045's record is 11 points better than the US average of 77.6%. That gap is worth roughly 112 fewer late arrivals for every thousand flights.

On time

88.8%

Arrivals under 15 minutes late, of 321 completed flights

Avg delay

77 min

Across delayed arrivals only, not all flights

Cancelled

0.62%

National rate is 1.81%

1 hour+ late

4.4%

National rate is 8.1%

These figures cover 323 flights between July 2025 and June 2026. The median arrival is 16 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.

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 67 of 323 flights, with 11:55 (65 flights) and 11:43 (34 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 11:5067 flights20.7%
Departs 11:5565 flights20.1%
Departs 11:4334 flights10.5%

Scale runs 0% to 100%. Rows with fewer than 30 flights show a dash.

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 78.8%, and DL 1045 runs 10 points better at 88.8%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Against the route

DL 1045 next to LAX to SEA

Every carrier on LAX to SEA combined arrived on time 85.4% of the time across 7,424 flights, so DL 1045 is 3 points ahead of it. Delta flew 2,224 flights on the same city pair under all its flight numbers, including this one, and those ran 86.8% on time. Across its whole network Delta Air Lines managed 81.6%, which this flight beats by 7 points.

DL 1045 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 1045thin sample	323	88.8%	77 min	0.62%	A+
All Delta Air Lines on LAX–SEA	2,224	86.8%	76 min	0.76%	A+
All carriers on LAX–SEA	7,424	85.4%	64 min	0.98%	A+
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	B

Across the year

DL 1045 quarter by quarter

Quarter by quarter DL 1045 held fairly steady: 92.4% in Jul–Sep 2025, 89.8% in Oct–Dec 2025, 88.0% in Jan–Mar 2026 and 84.6% in Apr–Jun 2026. A spread of 8 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202592 flights92.4%
Oct–Dec 202589 flights89.8%
Jan–Mar 202651 flights88.0%
Apr–Jun 202691 flights84.6%

Scale runs 75% to 100%. Rows with fewer than 30 flights show a dash.

By weekday, DL 1045 ranged from 82.6% on Monday to 93.8% on Tuesday. With about 46 flights behind each day, a spread of 11 points is inside normal variation, so the day you fly is not worth changing for this flight.

Delay causes

Why DL 1045 runs late

One category carries most of the weight here. Carrier accounts for 69% of the 2,770 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.

Carrier
69%
Late-arriving aircraft
29%
National Airspace System
2%

The largest share of delay minutes, 69%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 1,916 of the 2,770 delay minutes reported here. The split is drawn from 2,770 delay minutes reported on DL 1045.

Cancellations are rare at 0.62%, below the national 1.81% 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 4.4% land an hour or more behind schedule, against 8.1% 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. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.

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: 88.8% on time and 0.62% cancelled. That is a base rate, not a promise about any single day.

Where to go next

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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.

Key figures