Flight number record

DL 1177

Delta Air Lines · Salt Lake City to San Diego

Route: SLC → SAN
Departs: 07:45
Flights: 364
Period: September 2025 to August 2026

Historical statistics for September 2025 to August 2026, not live status. For today’s DL 1177, check with Delta Air Lines.

DL 1177 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 16 points better than the national rate of 77.3%. When something does go wrong the average delay runs roughly 50 minutes. That rests on 364 flights, with a median arrival 10 minutes early.

Set against the rest of the country, DL 1177's record is 16 points better than the US average of 77.3%. That gap is worth roughly 155 fewer late arrivals for every thousand flights.

On time

92.8%

Arrivals under 15 minutes late, of 360 completed flights

Avg delay

52 min

Across delayed arrivals only, not all flights

Cancelled

1.10%

National rate is 1.89%

1 hour+ late

1.7%

National rate is 8.3%

These figures cover 364 flights between September 2025 and August 2026. The median arrival is 10 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 1177 flies

DL 1177 is scheduled to leave Salt Lake City (SLC) at 07:45 local time and reach San Diego (SAN) at 08:45. That slot held for 337 of the 364 scheduled departures in the data, so the figures below describe one steady operation rather than a number that moved around the clock.

Departs 07:45337 flights92.6%

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 07:45 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and DL 1177 runs 4 points better at 92.8%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.

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Against the route

DL 1177 next to SLC to SAN

Every carrier on SLC to SAN combined arrived on time 80.9% of the time across 3,097 flights, so DL 1177 is 12 points ahead of it. Delta flew 1,738 flights on the same city pair under all its flight numbers, including this one, and those ran 82.2% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight beats by 12 points.

DL 1177 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 1177thin sample	364	92.8%	52 min	1.10%	A
All Delta Air Lines on SLC–SAN	1,738	82.2%	54 min	0.92%	B+
All carriers on SLC–SAN	3,097	80.9%	54 min	0.90%	B+
Delta Air Lines, whole network	1,039,517	81.1%	71 min	1.74%	B

Across the year

DL 1177 quarter by quarter

DL 1177 did not run the same all year. Its best quarter was Jan–Mar 2026 at 96.6% on time and its weakest Jul–Sep 2025 at 83.3%, a swing of 13 points on roughly 73 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 flights83.3%
Oct–Dec 202591 flights91.1%
Jan–Mar 202690 flights96.6%
Apr–Jun 202691 flights94.4%
Jul–Sep 202662 flights91.8%

Scale runs 75% to 100%.

By weekday, DL 1177 ranged from 86.5% on Thursday to 98.1% on Monday. With about 52 flights behind each day, a spread of 12 points is inside normal variation, so the day you fly is not worth changing for this flight.

Arrival by arrival

How late DL 1177 runs when it is late

DL 1177 often beats the schedule: 113 of 360 completed flights, 31%, arrived 15 minutes or more early. The 26 late arrivals split 9 under half an hour, 11 between 30 and 60 minutes, and 6 an hour or more.

15+ min early113 flights31.4%
Within 15 min221 flights61.4%
15–29 min late9 flights2.5%
30–59 min late11 flights3.1%
1–2 hours late4 flights1.1%
2+ hours late2 flights0.6%

Scale runs 0% to 100%.

Share of 360 completed flights by arrival against schedule.

Time lost at the gate mostly stays lost. Of 22 departures that left 15 minutes late or more, only 2 made it up before arrival. Only 6 left on time and still arrived late.

The worst days

Worst days for DL 1177

The latest arrival of the period was on 5 June 2026, 2 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 1177 in the period
Date	Arrived late by	Largest filed cause
5 June 2026	2 hours 36 minutes	Carrier
24 December 2025	2 hours 6 minutes	Carrier
16 June 2026	1 hour 49 minutes	Carrier
18 September 2025	1 hour 18 minutes	National Airspace System
2 November 2025	1 hour 13 minutes	National Airspace System

Delay causes

Why DL 1177 runs late

Carrier accounts for 61% of the 1,338 delay minutes carriers reported here, and the remaining four split what is left.

Carrier
61%
National Airspace System
35%
Late-arriving aircraft
4%

The largest share of delay minutes, 61%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 819 of the 1,338 delay minutes reported here. The split is drawn from 1,338 delay minutes reported on DL 1177.

Cancellations sit at 1.10% against a national 1.89%, which is ordinary. Diversions add another 0.00%.

Connections and routes

What a delay on this flight costs

Badly late arrivals are rare here: only 1.7% 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 626 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.

DL 1177 is not only a SLC to SAN flight. It also flew SAN to SLC (364 flights, 92.5% on time) often enough to be scored on its own. Airlines attach one number to several legs of an aircraft's day, and each leg keeps its own record here, so check which city pair is on your booking before reading a rate.

One caution: this is a thin sample. 364 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.

Other routes flown as DL 1177
Also flown as	Flights	On time	Avg delay	Cancelled	Grade
SAN to SLCthin sample	364	92.5%	80 min	1.10%	A

What to do with this

Booking DL 1177

For a booking, DL 1177 has one of the better records a US domestic flight can show: 92.8% on time and 1.10% 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