Flight number record

DL 1265

Delta Air Lines · Seattle to Salt Lake City

Route: SEA → SLC
Departs: 11:15
Flights: 344
Period: September 2025 to August 2026

Historical statistics for September 2025 to August 2026, not live status. For today’s DL 1265, check with Delta Air Lines.

DL 1265 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 8 points better than the national rate of 77.3%. When something does go wrong the average delay runs about an hour. That rests on 344 flights, with a median arrival 7 minutes early.

Set against the rest of the country, DL 1265's record is 8 points better than the US average of 77.3%. That gap is worth roughly 78 fewer late arrivals for every thousand flights.

On time

85.1%

Arrivals under 15 minutes late, of 342 completed flights

Avg delay

56 min

Across delayed arrivals only, not all flights

Cancelled

0.58%

National rate is 1.89%

1 hour+ late

4.4%

National rate is 8.3%

These figures cover 344 flights between September 2025 and August 2026. The median arrival is 7 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 1265 flies

DL 1265 flies SEA to SLC without a single fixed slot. Its most common scheduled departure was 11:15, used on 102 of 344 flights, with 11:25 (67 flights) and 11:05 (59 flights) next.

Departs 11:15102 flights29.7%
Departs 11:2567 flights19.5%
Departs 11:0559 flights17.2%

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 11:15 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and DL 1265 runs 7 points better at 85.1%. 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 1265 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 1265 is 2 points ahead of 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%, which this flight beats by 4 points.

DL 1265 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 1265thin sample	344	85.1%	56 min	0.58%	A+
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 1265 quarter by quarter

DL 1265 did not run the same all year. Its best quarter was Apr–Jun 2026 at 90.1% on time and its weakest Jul–Sep 2026 at 79.0%, a swing of 11 points on roughly 69 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 202578 flights87.0%
Jan–Mar 202683 flights80.5%
Apr–Jun 202691 flights90.1%
Jul–Sep 202662 flights79.0%

Scale runs 70% to 95%.

By weekday, DL 1265 ranged from 81.2% on Friday to 89.6% on Sunday. With about 49 flights behind each day, a spread of 8 points is inside normal variation, so the day you fly is not worth changing for this flight.

Arrival by arrival

How late DL 1265 runs when it is late

The 51 late arrivals split 22 under half an hour, 14 between 30 and 60 minutes, and 15 an hour or more.

15+ min early83 flights24.3%
Within 15 min208 flights60.8%
15–29 min late22 flights6.4%
30–59 min late14 flights4.1%
1–2 hours late8 flights2.3%
2+ hours late7 flights2.0%

Scale runs 0% to 100%.

Share of 342 completed flights by arrival against schedule.

9 of 50 late departures made up the time and arrived on time, 18% of them. 10 flights left on time and still arrived late.

The worst days

Worst days for DL 1265

The latest arrival of the period was on 16 May 2026, 4 hours 18 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The five worst days are spread across May, July, January, August and February, with no single month standing out.

The latest arrivals of DL 1265 in the period
Date	Arrived late by	Largest filed cause
16 May 2026	4 hours 18 minutes	Carrier
16 July 2026	3 hours 47 minutes	Extreme weather
29 January 2026	2 hours 53 minutes	Late-arriving aircraft
17 August 2026	2 hours 48 minutes	Late-arriving aircraft
18 February 2026	2 hours 11 minutes	National Airspace System

Delay causes

Why DL 1265 runs late

Carrier accounts for 49% of the 2,863 delay minutes carriers reported here, and the remaining four split what is left.

Carrier
49%
Late-arriving aircraft
27%
National Airspace System
16%
Extreme weather
7%

The largest share of delay minutes, 49%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 1,400 of the 2,863 delay minutes reported here. The split is drawn from 2,863 delay minutes reported on DL 1265.

Cancellations are rare at 0.58%, 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

Badly late arrivals are rare here: only 4.4% 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 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 LGA to CHS (12) and CHS to LGA (12), but none flew often enough under DL 1265 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. 344 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 1265

For a booking, DL 1265 has one of the better records a US domestic flight can show: 85.1% on time and 0.58% 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, September 2025 to August 2026. Last updated 22 October 2026; recomputed monthly. How this data is collected.

Key figures