Flight profile · Delta Air Lines
DL2023
Philadelphia (PHL) to Salt Lake City (SLC) · scheduled 7:05 AM – 10:14 AM
How DL2023 performs
783 operations, June 2024 – July 2026.
DL2023 arrived on time 83.7% of the time, against 77.3% for all PHL → SLC flights, so this departure is 6.4 percentage points better than the route as a whole. Against Delta Air Lines’ own flights on this route it is 2.9 points better.
Source: US DOT Bureau of Transportation Statistics · 783 operations, June 2024 – July 2026 · If DL2023 is cancelled or significantly changed, DOT’s automatic refund rule may entitle you to your money back. The refund checker walks through eligibility.
Where DL2023 is right now
A live reading, only if you ask for it. It is not part of the reliability record above.
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Against the rest of the route
| Flight or route | On time | Cancelled | Median delay | Severe | Flights |
|---|---|---|---|---|---|
| DL2023 | 83.7% | 1.79% | -5 min | 4.3% | 783 |
| Delta Air Lines on PHL → SLC | 80.8% | 1.14% | -6 min | 6.2% | 1,845 |
| All PHL → SLC flights | 77.3% | 1.95% | -5 min | 7.9% | 2,262 |
Source: FlyerIntel analysis of US DOT BTS data · June 2024 – July 2026
Why DL2023 runs late
Where US DOT attributed the delay minutes on this flight.
crew, maintenance, boarding and fueling, all within the carrier’s control
airspace and airport capacity, including weather-driven flow control
the inbound aircraft was late, so this flight started late
weather severe enough to stop this flight specifically
Share of the delay minutes US DOT attributed to each cause for DL2023 on PHL → SLC. Only delays of 15 minutes or more are attributed.
Source: US DOT Bureau of Transportation Statistics · Data covering June 2024 – July 2026
Does a late aircraft delay this flight?
How often the plane that flies DL2023 comes in late, and what that does to the departure.
The aircraft flying DL2023 came in 15 or more minutes late on 17% of the departures where its previous flight is known. There are not enough departures in both groups to say how the flight left after a late one and after an on-time one.
Each departure is matched to the flight the same aircraft flew into PHL just before it, using the tail number in the DOT file, 578 of 770 departures in all. A departure is left out when that flight is unknown, was cancelled or diverted, or the aircraft had sat for more than 12 hours. A flight the airline cancelled never left and is not in the count, and one flown by a substitute aircraft is matched to the aircraft that flew it, not to the one first planned.
Against the network at the same turn length
| Share of departures | Inbound landed 15+ late |
|---|---|
| DL2023 | 17% |
| Network, same turn | 17% |
The schedule leaves a normal turn: enough time to clean and board if the aircraft is on time, little to spare if it is not.
The network row is every flight with a scheduled turn of 60 to 89 minutes. How often DL2023’s aircraft landed 15 or more minutes late is about the same as the network’s. There are not enough departures in both groups to compare how it left.
More: Which Flight Numbers Pay for a Late Aircraft lists the flight numbers that pass a late aircraft on.
Source: US DOT Bureau of Transportation Statistics · Data covering June 2024 – July 2026
From pushback to gate
When it leaves PHL late, does that still matter by the time it reaches SLC?
DL2023 pushes back an average of 7.1 minutes late and reaches the gate at SLC an average of 2.5 minutes late. The 4.6 minutes between those two figures are slack the published schedule already carries, which is why a late pushback on this flight does not reliably become a late arrival. It spends 16.9 minutes on the taxiways at PHL, 1.4 minutes shorter than a typical PHL departure in the same hour.
On arrival at SLC, DL2023 spends 9.8 min taxiing from touchdown to the gate — ground time a connecting passenger sits through before they can even leave the aircraft, on top of however late the flight itself ran. That is 2.7 minutes longer than a typical SLC arrival (7.1 min).
Departure delay is averaged over every pushback and arrival delay over every completed arrival, so the two counts differ by the flights that never reached SLC. Taxi-out is gate to wheels up and sits inside the scheduled block rather than on top of it; the comparison is 12,393 departures from PHL scheduled in the clock hour DL2023 most often leaves in. Taxi-in is landing to gate, compared against every arrival FlyerIntel has on file at SLC (355,118 flights), not just DL2023’s own. More on taxi time.
Source: FlyerIntel analysis of US DOT BTS data · June 2024 – July 2026
The hour it leaves PHL
Part of any flight’s record belongs to the clock rather than to the flight. DL2023 has one departure time, so this is what that time is worth.
On-time arrival rate. 12,393 departures from PHL are scheduled in the 7 AM–8 AM hour over the period, against 305,181 across the whole day.
DL2023 is scheduled out of PHL at 7:05 AM, in the 7 AM–8 AM bank. Departures from PHL in that hour arrive on time 84.9% of the time against 76.2% across the airport’s whole day — the slot alone is worth 8.6 points better before anything about this particular flight is considered.
The two airport figures cover every departure from PHL to every destination, so they describe the slot rather than this journey — the like-for-like comparison against the route is above. Hours are scheduled local, and a number whose schedule moved between banks inside the period has no single hour and is not described here at all. Why the hour matters.
Source: FlyerIntel analysis of US DOT BTS data · June 2024 – July 2026 · Hours below 120 departures are not scored.
Other routes DL2023 has flown
A flight number is a slot in a schedule, and carriers reassign it. These are the other city pairs this number served in the analysis period.
| Route | Operated | Flights | On time |
|---|---|---|---|
| MSY→SLC New Orleans to Salt Lake City | September 1, 2024 | 1 | — |
| MSP→ATL Minneapolis to Atlanta | July 1, 2023 – June 6, 2024 | 225 | 92.9% |
| LAX→ATL Los Angeles to Atlanta | April 9, 2024 – May 6, 2024 | 27 | — |
| SLC→SFO Salt Lake City to San Francisco | January 8, 2024 – March 9, 2024 | 62 | — |
| MSP→BIS Minneapolis to Bismarck | October 9, 2023 – November 4, 2023 | 27 | — |
Because the same number has served different journeys, the statistics above describe only the route DL2023 currently operates. Blending them would produce an average of two different flights.
When it goes wrong
The average describes a usual day. This is the day that ruins a connection.
25 min late
against a median of 5 min early
Percentiles over 783 operations; cancelled and diverted flights are counted separately.
Source: US DOT Bureau of Transportation Statistics · Data covering June 2024 – July 2026
Data and methodology
Calculated by FlyerIntel from 783 records of DL2023 operating PHL → SLC, published by the US DOT Bureau of Transportation Statistics. A flight counts as delayed when it arrives 15 or more minutes after schedule. Cancelled and diverted flights are excluded from the on-time rate and reported separately. Flight numbers are resolved as carrier plus number plus route, because the same number serves different routes over time.
Full methodology · Data sources · Report a problem
Related research: Most and Least Reliable Flight Numbers · The Delay You Inherit · Making Up Time in the Air
Analysis last recomputed