Flight number record
DL 2023
Delta Air Lines · Philadelphia to Salt Lake City
- Route
- PHL → SLC
- Departs
- 07:00
- Flights
- 365
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 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 77.3%. When something does go wrong the average delay runs about an hour. That rests on 365 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 77.3%. That gap is worth roughly 71 fewer late arrivals for every thousand flights.
Key figures
On time
84.4%
Arrivals under 15 minutes late, of 360 completed flights
Avg delay
64 min
Across delayed arrivals only, not all flights
Cancelled
1.37%
National rate is 1.89%
1 hour+ late
3.9%
National rate is 8.3%
These figures cover 365 flights between September 2025 and August 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.
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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 133 of 365 flights, with 07:05 (68 flights) next.
- Departs 07:00133 flights36.4%
- Departs 07:0568 flights18.6%
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 07:00 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.
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Against the route
DL 2023 next to PHL to SLC
Every carrier on PHL to SLC combined arrived on time 78.4% of the time across 804 flights, so DL 2023 is 6 points ahead of it. Delta flew 591 flights on the same city pair under all its flight numbers, including this one, and those ran 79.6% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight beats by 3 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 2023 | 365 | 84.4% | 64 min | 1.37% | B |
| All Delta Air Lines on PHL–SLC | 591 | 79.6% | 66 min | 1.18% | B |
| All carriers on PHL–SLC | 804 | 78.4% | 86 min | 1.99% | B |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | 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 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 flights90.0%
- Oct–Dec 202592 flights75.8%
- Jan–Mar 202690 flights80.5%
- Apr–Jun 202691 flights92.2%
- Jul–Sep 202662 flights88.7%
Scale runs 65% to 100%.
By weekday, DL 2023 ranged from 80.4% on Saturday to 92.2% on Tuesday. 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 2023 runs when it is late
Most of the lateness is short. 31 of the 56 late arrivals were under half an hour behind, and 14 reached an hour or more.
- 15+ min early66 flights18.3%
- Within 15 min238 flights66.1%
- 15–29 min late31 flights8.6%
- 30–59 min late11 flights3.1%
- 1–2 hours late7 flights1.9%
- 2+ hours late7 flights1.9%
Scale runs 0% to 100%.
Share of 360 completed flights by arrival against schedule.
A late pushback is often recovered here: of 41 departures that left 15 minutes late or more, 13 still arrived on time. In the other direction, 28 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at SLC.
The worst days
Worst days for DL 2023
The latest arrival of the period was on 23 March 2026, 6 hours 3 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. On four of the five worst days the largest share was filed as carrier-caused (crew, maintenance, fuelling, baggage).
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 23 March 2026 | 6 hours 3 minutes | Late-arriving aircraft |
| 29 July 2026 | 5 hours 42 minutes | Carrier |
| 23 October 2025 | 5 hours 29 minutes | Carrier |
| 1 July 2026 | 4 hours 29 minutes | Carrier |
| 8 March 2026 | 3 hours 41 minutes | Carrier |
Delay causes
Why DL 2023 runs late
Carrier accounts for 56% of the 3,590 delay minutes carriers reported here, and the remaining four split what is left.
- 56%Carrier
- 28%National Airspace System
- 13%Late-arriving aircraft
- 2%Extreme weather
The largest share of delay minutes, 56%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 2,005 of the 3,590 delay minutes reported here. The split is drawn from 3,590 delay minutes reported on DL 2023.
Cancellations sit at 1.37% 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 3.9% 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.
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 365 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. 365 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 1.37% cancelled over 365 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- PHL to SLC, every carrier and departure
- SLC to PHL, the return direction
- Philadelphia International (PHL) delay statistics
- Salt Lake City International (SLC) delay statistics
- Delta Air Lines on-time record
- Every Delta Air Lines flight number with a record
- The most and least reliable flight numbers in the US
- Worst months to fly in the US, ranked by the data
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 ; recomputed monthly. How this data is collected.