Flight number record

DL 1165

Delta Air Lines · Seattle to Salt Lake City

Route: SEA → SLC
Departs: 17:00
Flights: 302
Period: September 2025 to August 2026

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

DL 1165 lands a B+, 3 points better than the national rate of 77.3%. About one flight in five arrives 15 minutes late or worse, and those flights are late by about an hour on average. That rests on 302 flights, with a median arrival right on schedule.

On time

80.4%

Arrivals under 15 minutes late, of 301 completed flights

Avg delay

58 min

Across delayed arrivals only, not all flights

Cancelled

0.33%

National rate is 1.89%

1 hour+ late

7.3%

National rate is 8.3%

These figures cover 302 flights between September 2025 and August 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.

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Schedule

When DL 1165 flies

DL 1165 flies SEA to SLC without a single fixed slot. Its most common scheduled departure was 17:00, used on 67 of 302 flights, with 17:45 (56 flights) and 17:59 (51 flights) next.

Departs 17:0067 flights22.2%
Departs 17:4556 flights18.5%
Departs 17:5951 flights16.9%

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 17:00 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.0%, and DL 1165 runs 12 points better at 80.4%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.

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Against the route

DL 1165 next to SEA to SLC

Every carrier on SEA to SLC combined arrived on time 83.4% of the time across 4,098 flights, so DL 1165 is 3 points behind it. Delta flew 2,232 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 81.1%, close to this flight's figure.

DL 1165 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 1165thin sample	302	80.4%	58 min	0.33%	B+
All Delta Air Lines on SEA–SLC	2,232	86.8%	59 min	0.49%	A+
All carriers on SEA–SLC	4,098	83.4%	49 min	0.78%	B+
Delta Air Lines, whole network	1,039,517	81.1%	71 min	1.74%	B

Across the year

DL 1165 quarter by quarter

DL 1165 did not run the same all year. Its best quarter was Jul–Sep 2025 at 90.0% on time and its weakest Jul–Sep 2026 at 75.8%, a swing of 14 points on roughly 76 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 flights90.0%
Oct–Dec 202591 flights79.1%
Jan–Mar 202628 flights—
Apr–Jun 202691 flights82.4%
Jul–Sep 202662 flights75.8%

Scale runs 65% to 95%. Rows with fewer than 30 flights show a dash.

By weekday, DL 1165 did best on Monday at 93.2% on time and worst on Sunday at 59.1%. Each day rests on about 43 flights, so a gap of 34 points is worth noticing but could still narrow in another year.

Arrival by arrival

How late DL 1165 runs when it is late

The 59 late arrivals split 16 under half an hour, 21 between 30 and 60 minutes, and 22 an hour or more.

15+ min early41 flights13.6%
Within 15 min201 flights66.8%
15–29 min late16 flights5.3%
30–59 min late21 flights7.0%
1–2 hours late16 flights5.3%
2+ hours late6 flights2.0%

Scale runs 0% to 100%.

Share of 301 completed flights by arrival against schedule.

18 of 69 late departures made up the time and arrived on time, 26% of them. 8 flights left on time and still arrived late.

The worst days

Worst days for DL 1165

The latest arrival of the period was on 23 June 2026, 3 hours 36 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on three of the five worst days.

The latest arrivals of DL 1165 in the period
Date	Arrived late by	Largest filed cause
23 June 2026	3 hours 36 minutes	Carrier
19 July 2026	2 hours 37 minutes	Late-arriving aircraft
16 October 2025	2 hours 33 minutes	Carrier
19 October 2025	2 hours 31 minutes	Carrier
14 December 2025	2 hours 25 minutes	Late-arriving aircraft

Delay causes

Why DL 1165 runs late

Carrier accounts for 47% of the 3,403 delay minutes carriers reported here, and the remaining four split what is left.

Carrier
47%
Late-arriving aircraft
46%
National Airspace System
8%
Extreme weather
0%

46% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 3,403 reported delay minutes here, that single category outweighs weather by 46 to one. The split is drawn from 3,403 delay minutes reported on DL 1165.

Cancellations are rare at 0.33%, 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

7.3% 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 about an hour, 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.

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 80.4% on time with 0.33% 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, September 2025 to August 2026. Last updated 22 October 2026; recomputed monthly. How this data is collected.

Key figures