Flight number record

DL 1165

Delta Air Lines · Seattle to Salt Lake City

Route: SEA → SLC
Departs: 17:45
Flights: 302
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s DL 1165, check with Delta Air Lines.

DL 1165 lands a B+, about a point better than the national rate of 77.6%. About one flight in five arrives 15 minutes late or worse, and those flights are late by roughly 55 minutes on average. That is a workable record, not a spotless one. That rests on 302 flights, with a median arrival right on schedule.

On time

79.0%

Arrivals under 15 minutes late, of 300 completed flights

Avg delay

53 min

Across delayed arrivals only, not all flights

Cancelled

0.66%

National rate is 1.81%

1 hour+ late

6.7%

National rate is 8.1%

These figures cover 302 flights between July 2025 and June 2026. On-time means an arrival less than 15 minutes after the scheduled gate time, the same threshold the Department of Transportation uses in its own reports. Cancelled and diverted flights are excluded from the on-time rate and counted separately, which is why the cancellation column matters on its own.

Schedule

When DL 1165 flies

DL 1165 flies SEA to SLC without a single fixed slot. Its most common scheduled departure was 17:45, used on 97 of 302 flights, with 17:00 (67 flights) and 16:55 (31 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 17:4597 flights32.1%
Departs 17:0067 flights22.2%
Departs 16:5531 flights10.3%

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 17:45 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.2%, and DL 1165 runs 11 points better at 79.0%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.

Against the route

DL 1165 next to SEA to SLC

Every carrier on SEA to SLC combined arrived on time 83.6% of the time across 4,107 flights, so DL 1165 is 5 points behind it. Delta flew 2,219 flights on the same city pair under all its flight numbers, including this one, and those ran 87.0% on time. Across its whole network Delta Air Lines managed 81.6%, which this flight trails by 3 points.

DL 1165 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 1165thin sample	302	79.0%	53 min	0.66%	B+
All Delta Air Lines on SEA–SLC	2,219	87.0%	58 min	0.54%	A+
All carriers on SEA–SLC	4,107	83.6%	50 min	0.93%	B+
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	B

Across the year

DL 1165 quarter by quarter

Quarter by quarter DL 1165 held fairly steady: 75.8% in Jul–Sep 2025, 79.1% in Oct–Dec 2025 and 82.4% in Apr–Jun 2026. A spread of 7 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202592 flights75.8%
Oct–Dec 202591 flights79.1%
Jan–Mar 202628 flights—
Apr–Jun 202691 flights82.4%

Scale runs 65% to 90%. Rows with fewer than 30 flights show a dash.

By weekday, DL 1165 did best on Monday at 88.4% on time and worst on Sunday at 63.6%. Each day rests on about 43 flights, so a gap of 25 points is worth noticing but could still narrow in another year.

Delay causes

Why DL 1165 runs late

One category carries most of the weight here. Carrier accounts for 48% of the 3,346 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
48%
Late-arriving aircraft
42%
National Airspace System
9%

42% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 3,346 reported delay minutes here, that single category outweighs weather by 42 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 3,346 delay minutes reported on DL 1165.

Cancellations are rare at 0.66%, 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

6.7% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last roughly 55 minutes, which a normal layover absorbs.

The 689 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 SNA to SEA (19) and SAV to ATL (11), but none flew often enough under DL 1165 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to SEA to SLC only.

One caution: this is a thin sample. 302 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 1165

For a booking, read DL 1165 as 79.0% on time with 0.66% cancelled over 302 flights. Those are rates from the past twelve months, not a forecast for any particular 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