Flight profile · Delta Air Lines
DL1252
Salt Lake City (SLC) to San Diego (SAN) · scheduled 5:10 PM – 6:12 PM
How DL1252 performs
602 operations, June 2024 – August 2026.
Between its first and last recorded date on SLC → SAN, DL1252 averaged about 5 operations a week (602 in 816 days, cancelled ones included).
DL1252 arrived on time 77.9% of the time, against 81.2% for all SLC → SAN flights, so this departure is 3.3 percentage points worse than the route as a whole. Against Delta Air Lines’ own flights on this route it is 4.6 points worse.
Source: US DOT Bureau of Transportation Statistics · 602 operations, June 2024 – August 2026 · If DL1252 is cancelled or significantly changed, DOT’s automatic refund rule may entitle you to your money back. The refund checker walks through eligibility.
Where DL1252 is right now
A live reading, only if you ask for it. It is not part of the reliability record above.
Ask for the position of DL1252 right now, if receivers on the ground are hearing it. Nothing is requested until you press the button.
Against the rest of the route
| Flight or route | On time | Cancelled | Median delay | Severe | Flights |
|---|---|---|---|---|---|
| DL1252 | 77.9% | 0.33% | -4 min | 6.4% | 602 |
| Delta Air Lines on SLC → SAN | 82.5% | 0.53% | -6 min | 4.8% | 5,497 |
| All SLC → SAN flights | 81.2% | 0.55% | -6 min | 5.2% | 8,591 |
DL1252 cancelled 2 of 602 operations (0.33%), close to the 0.55% for SLC → SAN.
Source: FlyerIntel analysis of US DOT BTS data · June 2024 – August 2026
Why DL1252 runs late
Where US DOT attributed the delay minutes on this flight.
crew, maintenance, boarding and fueling, all within the carrier’s control
the inbound aircraft was late, so this flight started late
airspace and airport capacity, including weather-driven flow control
weather severe enough to stop this flight specifically
Share of the delay minutes US DOT attributed to each cause for DL1252 on SLC → SAN. Only delays of 15 minutes or more are attributed. What the five causes mean
Source: US DOT Bureau of Transportation Statistics · Data covering June 2024 – August 2026
Does a late aircraft delay this flight?
How often the plane that flies DL1252 comes in late, and what that does to the departure.
The aircraft flying DL1252 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.
Matched by tail number to the aircraft’s previous flight into SLC: 567 of 600 departures. Unknown, cancelled or diverted inbounds and gaps over 12 hours are left out.
Against the network at the same turn length
| Share of departures | Inbound landed 15+ late |
|---|---|
| DL1252 | 17% |
| Network, same turn | 17% |
70 scheduled minutes is enough to clean and board when the aircraft is on time, with little to spare when it is not.
The network row is every flight with a scheduled turn of 60 to 89 minutes. How often DL1252’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.
Source: US DOT Bureau of Transportation Statistics · Data covering June 2024 – August 2026
From pushback to gate
When it leaves SLC late, does that still matter by the time it reaches SAN?
DL1252 pushes back an average of 12.9 minutes late and reaches the gate at SAN an average of 8.1 minutes late. The 4.8 minutes between those two figures are slack the published schedule already carries, so a late pushback is partly, not fully, made up before the gate. It spends 14.9 minutes on the taxiways at SLC, 2.1 minutes shorter than a typical SLC departure in the same hour.
On arrival at SAN, DL1252 spends 6.0 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 about what any arrival at SAN spends on the ground before reaching the gate.
Taxi-out is gate to wheels up and sits inside the scheduled block; the hourly comparison is 37,469 SLC departures. Taxi-in is landing to gate, set against 307,043 arrivals at SAN. More on taxi time.
Source: FlyerIntel analysis of US DOT BTS data · June 2024 – August 2026
The hour it leaves SLC
DL1252 has one departure time, 5:10 PM, so this is what that hour at SLC is worth.
On-time arrival rate. 37,469 departures from SLC are scheduled in the 5 PM–6 PM hour over the period, against 365,355 across the whole day.
DL1252 is scheduled out of SLC at 5:10 PM, in the 5 PM–6 PM bank. Departures from SLC in that hour arrive on time 80.0% of the time against 83.9% across the airport’s whole day — the slot alone is worth 3.9 points worse before anything about this particular flight is considered.
Both airport figures cover every destination from SLC, so they describe the slot, not this journey; the route comparison is above. Why the hour matters.
Source: FlyerIntel analysis of US DOT BTS data · June 2024 – August 2026 · Hours below 120 departures are not scored.
Other routes DL1252 has flown
Carriers reassign flight numbers. DL1252 also served these 7 other city pairs in the period.
| Route | Operated | Flights | On time |
|---|---|---|---|
| SAN→SLC San Diego to Salt Lake City | June 7, 2024 – August 31, 2026 | 249 | 81.0% |
| MSP→ATL Minneapolis to Atlanta | February 16, 2026 – March 2, 2026 | 3 | — |
| MSY→ATL New Orleans to Atlanta | September 14, 2024 – October 5, 2024 | 4 | — |
| MSP→BOS Minneapolis to Boston | July 1, 2023 – June 6, 2024 | 229 | 87.3% |
| SLC→MEM Salt Lake City to Memphis | May 11, 2024 – June 1, 2024 | 5 | — |
| LAX→SLC Los Angeles to Salt Lake City | April 9, 2024 – May 6, 2024 | 28 | — |
| DEN→SLC Denver to Salt Lake City | January 8, 2024 – March 9, 2024 | 59 | — |
The figures above describe only SLC → SAN, the route DL1252 flies now.
When it goes wrong
The average describes a usual day. This is the day that ruins a connection.
39 min late
against a median of 4 min early
Percentiles over 602 operations; cancelled and diverted flights are counted separately.
Source: US DOT Bureau of Transportation Statistics · Data covering June 2024 – August 2026
Other flights on this route
Same airports, same journey, different odds of arriving on time.
| Flight | Airline | On time | Median arrival | Operations |
|---|---|---|---|---|
| DL1177 | Delta Air Lines | 87.1% | 9 min early | 815 |
| DL1202 | Delta Air Lines | 84.2% | 7 min early | 814 |
| DL1252 this flight | Delta Air Lines | 77.9% | 4 min early | 602 |
| DL1210 | Delta Air Lines | 76.2% | 3 min early | 814 |
Among all 4 departures on this route with at least 600 operations, DL1252 has the 3rd highest on-time rate, 9.2 points behind the best. Every departure here has at least 600 operations; the other rows are the most punctual on the route, not all of them.
Data and methodology
Calculated by FlyerIntel from 602 records of DL1252 operating SLC → SAN, 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 reported separately, not in the on-time rate.
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