Flight number record

DL 2023

Delta Air Lines · Philadelphia to Salt Lake City

Route: PHL → SLC
Departs: 07:00
Flights: 364
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s DL 2023, check with Delta Air Lines.

DL 2023 earns a B. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 7 points better than the national rate of 77.6%. When something does go wrong the average delay runs about 50 minutes. That rests on 364 flights, with a median arrival 2 minutes early.

Set against the rest of the country, DL 2023's record is 7 points better than the US average of 77.6%. That gap is worth roughly 68 fewer late arrivals for every thousand flights.

On time

84.4%

Arrivals under 15 minutes late, of 358 completed flights

Avg delay

49 min

Across delayed arrivals only, not all flights

Cancelled

1.65%

National rate is 1.81%

1 hour+ late

2.8%

National rate is 8.1%

These figures cover 364 flights between July 2025 and June 2026. The median arrival is 2 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 2023 flies

DL 2023 flies PHL to SLC without a single fixed slot. Its most common scheduled departure was 07:00, used on 154 of 364 flights, with 07:05 (73 flights) and 07:10 (58 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 07:00154 flights42.3%
Departs 07:0573 flights20.1%
Departs 07:1058 flights15.9%

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 07:00 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and DL 2023 runs 5 points worse at 84.4%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.

Against the route

DL 2023 next to PHL to SLC

Every carrier on PHL to SLC combined arrived on time 76.9% of the time across 833 flights, so DL 2023 is 8 points ahead of it. Delta flew 613 flights on the same city pair under all its flight numbers, including this one, and those ran 78.3% on time. Across its whole network Delta Air Lines managed 81.6%, which this flight beats by 3 points.

DL 2023 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 2023thin sample	364	84.4%	49 min	1.65%	B
All Delta Air Lines on PHL–SLC	613	78.3%	59 min	1.31%	B
All carriers on PHL–SLC	833	76.9%	67 min	2.40%	B
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	B

Across the year

DL 2023 quarter by quarter

DL 2023 did not run the same all year. Its best quarter was Apr–Jun 2026 at 92.2% on time and its weakest Oct–Dec 2025 at 75.8%, a swing of 16 points on roughly 91 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 202591 flights88.9%
Oct–Dec 202592 flights75.8%
Jan–Mar 202690 flights80.5%
Apr–Jun 202691 flights92.2%

Scale runs 65% to 100%. Rows with fewer than 30 flights show a dash.

By weekday, DL 2023 did best on Tuesday at 92.2% on time and worst on Saturday at 78.4%. Each day rests on about 52 flights, so a gap of 14 points is worth noticing but could still narrow in another year.

Delay causes

Why DL 2023 runs late

Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 2,759 reported delay minutes.

National Airspace System
36%
Carrier
35%
Late-arriving aircraft
26%
Extreme weather
3%

The largest share of delay minutes, 35%, 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 976 of the 2,759 delay minutes reported here. The split is drawn from 2,759 delay minutes reported on DL 2023.

Cancellations sit at 1.65% against a national 1.81%, 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 2.8% 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.

At 1,927 miles this is transcontinental flying, and long routes get a quiet structural advantage. Scheduled block time on a flight this length carries more padding in absolute minutes, so a twenty-minute late departure often still becomes an on-time arrival. Read the on-time rate here as slightly flattering next to a short-haul route with the same operational quality.

Every one of the 364 flights under DL 2023 in the data flew PHL to SLC. The number was not reused on any other city pair, which makes this a clean record of one route.

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.

What to do with this

Booking DL 2023

For a booking, read DL 2023 as 84.4% on time with 1.65% cancelled over 364 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