Flight number record
DL 1423
Delta Air Lines · Salt Lake City to Sacramento
- Route
- SLC → SMF
- Departs
- 11:15
- Flights
- 358
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 1423, check with Delta Air Lines.
DL 1423 earns an A+. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 8 points better than the national rate of 77.3%. When something does go wrong the average delay runs about an hour. That rests on 358 flights, with a median arrival 9 minutes early.
Set against the rest of the country, DL 1423's record is 8 points better than the US average of 77.3%. That gap is worth roughly 79 fewer late arrivals for every thousand flights.
Key figures
On time
85.2%
Arrivals under 15 minutes late, of 357 completed flights
Avg delay
62 min
Across delayed arrivals only, not all flights
Cancelled
0.28%
National rate is 1.89%
1 hour+ late
7.0%
National rate is 8.3%
These figures cover 358 flights between September 2025 and August 2026. The median arrival is 9 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 1423 flies
DL 1423 flies SLC to SMF without a single fixed slot. Its most common scheduled departure was 11:15, used on 97 of 358 flights, with 11:40 (75 flights) and 11:35 (53 flights) next.
- Departs 11:1597 flights27.1%
- Departs 11:4075 flights20.9%
- Departs 11:3553 flights14.8%
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 11:15 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and DL 1423 runs 7 points better at 85.2%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
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Against the route
DL 1423 next to SLC to SMF
Every carrier on SLC to SMF combined arrived on time 84.8% of the time across 2,165 flights, so DL 1423 is about level with it. Delta flew 1,503 flights on the same city pair under all its flight numbers, including this one, and those ran 86.4% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight beats by 4 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 1423thin sample | 358 | 85.2% | 62 min | 0.28% | A+ |
| All Delta Air Lines on SLC–SMF | 1,503 | 86.4% | 66 min | 1.20% | A |
| All carriers on SLC–SMF | 2,165 | 84.8% | 63 min | 0.92% | B+ |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 1423 quarter by quarter
DL 1423 did not run the same all year. Its best quarter was Jul–Sep 2025 at 93.3% on time and its weakest Jan–Mar 2026 at 80.9%, a swing of 12 points on roughly 72 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 flights93.3%
- Oct–Dec 202592 flights81.5%
- Jan–Mar 202690 flights80.9%
- Apr–Jun 202684 flights90.5%
- Jul–Sep 202662 flights85.5%
Scale runs 70% to 100%.
By weekday, DL 1423 did best on Thursday at 92.3% on time and worst on Monday at 73.6%. Each day rests on about 51 flights, so a gap of 19 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 1423 runs when it is late
DL 1423 often beats the schedule: 103 of 357 completed flights, 29%, arrived 15 minutes or more early. The 53 late arrivals split 16 under half an hour, 12 between 30 and 60 minutes, and 25 an hour or more.
- 15+ min early103 flights28.9%
- Within 15 min201 flights56.3%
- 15–29 min late16 flights4.5%
- 30–59 min late12 flights3.4%
- 1–2 hours late20 flights5.6%
- 2+ hours late5 flights1.4%
Scale runs 0% to 100%.
Share of 357 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 52 departures that left 15 minutes late or more, only 5 made it up before arrival. Only 6 left on time and still arrived late.
The worst days
Worst days for DL 1423
The latest arrival of the period was on 2 December 2025, 2 hours 58 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The five worst days are spread across December, January, June and February, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 2 December 2025 | 2 hours 58 minutes | Late-arriving aircraft |
| 27 January 2026 | 2 hours 57 minutes | Late-arriving aircraft |
| 24 December 2025 | 2 hours 42 minutes | Carrier |
| 27 June 2026 | 2 hours 38 minutes | Extreme weather |
| 5 February 2026 | 2 hours 16 minutes | Carrier |
Delay causes
Why DL 1423 runs late
Carrier accounts for 50% of the 3,277 delay minutes carriers reported here, and the remaining four split what is left.
- 50%Carrier
- 37%Late-arriving aircraft
- 7%Extreme weather
- 5%National Airspace System
37% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 3,277 reported delay minutes here, that single category outweighs weather by 5 to one. The split is drawn from 3,277 delay minutes reported on DL 1423.
Cancellations are rare at 0.28%, below the national 1.89% and low enough to earn the plus on the grade. Roughly one flight in 100 is called off; the risk here is arriving late, not not arriving.
Connections and routes
What a delay on this flight costs
7.0% of arrivals land an hour or more late, close to the national 8.3%, so a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last about an hour, which a normal layover absorbs.
The 532 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 1423 is not only a SLC to SMF flight. It also flew SMF to SLC (358 flights, 86.2% 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. 358 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.
| Also flown as | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| SMF to SLCthin sample | 358 | 86.2% | 57 min | 0.28% | A+ |
What to do with this
Booking DL 1423
For a booking, DL 1423 has one of the better records a US domestic flight can show: 85.2% on time and 0.28% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- SLC to SMF, every carrier and departure
- SMF to SLC, the return direction
- Delta Air Lines 1582 on the same route89.0%
- Delta Air Lines 1342 on the same route81.8%
- Delta Air Lines 1367 on the same route92.6%
- Salt Lake City International (SLC) delay statistics
- Sacramento International (SMF) 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
- Why the first flight of the morning is statistically safest
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.