Flight number record
DL 1431
Delta Air Lines · Salt Lake City to Phoenix
- Route
- SLC → PHX
- Departs
- 11:25
- Flights
- 365
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 1431, check with Delta Air Lines.
DL 1431 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 6 minutes early.
Set against the rest of the country, DL 1431's record is 7 points better than the US average of 77.3%. That gap is worth roughly 73 fewer late arrivals for every thousand flights.
Key figures
On time
84.6%
Arrivals under 15 minutes late, of 363 completed flights
Avg delay
56 min
Across delayed arrivals only, not all flights
Cancelled
0.27%
National rate is 1.89%
1 hour+ late
5.2%
National rate is 8.3%
These figures cover 365 flights between September 2025 and August 2026. The median arrival is 6 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 1431 flies
DL 1431 flies SLC to PHX without a single fixed slot. Its most common scheduled departure was 11:25, used on 119 of 365 flights, with 11:30 (115 flights) and 11:35 (50 flights) next.
- Departs 11:25119 flights32.6%
- Departs 11:30115 flights31.5%
- Departs 11:3550 flights13.7%
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 11:25 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and DL 1431 runs 6 points better at 84.6%. 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 1431 next to SLC to PHX
Every carrier on SLC to PHX combined arrived on time 83.5% of the time across 5,778 flights, so DL 1431 is about level with it. Delta flew 1,707 flights on the same city pair under all its flight numbers, including this one, and those ran 87.6% 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 1431 | 365 | 84.6% | 56 min | 0.27% | B+ |
| All Delta Air Lines on SLC–PHX | 1,707 | 87.6% | 56 min | 0.53% | A+ |
| All carriers on SLC–PHX | 5,778 | 83.5% | 70 min | 0.54% | B+ |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 1431 quarter by quarter
DL 1431 did not run the same all year. Its best quarter was Apr–Jun 2026 at 87.9% on time and its weakest Oct–Dec 2025 at 76.1%, a swing of 12 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 202530 flights—
- Oct–Dec 202592 flights76.1%
- Jan–Mar 202690 flights84.3%
- Apr–Jun 202691 flights87.9%
- Jul–Sep 202662 flights87.1%
Scale runs 70% to 95%. Rows with fewer than 30 flights show a dash.
By weekday, DL 1431 ranged from 78.8% on Sunday to 90.2% on Friday. With about 52 flights behind each day, a spread of 11 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late DL 1431 runs when it is late
The 56 late arrivals split 23 under half an hour, 14 between 30 and 60 minutes, and 19 an hour or more.
- 15+ min early74 flights20.4%
- Within 15 min233 flights64.2%
- 15–29 min late23 flights6.3%
- 30–59 min late14 flights3.9%
- 1–2 hours late15 flights4.1%
- 2+ hours late4 flights1.1%
Scale runs 0% to 100%.
Share of 363 completed flights by arrival against schedule.
11 of 55 late departures made up the time and arrived on time, 20% of them. 12 flights left on time and still arrived late.
The worst days
Worst days for DL 1431
The latest arrival of the period was on 28 July 2026, 4 hours 43 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on four of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 28 July 2026 | 4 hours 43 minutes | Carrier |
| 10 November 2025 | 3 hours 7 minutes | National Airspace System |
| 18 April 2026 | 3 hours 6 minutes | Carrier |
| 8 October 2025 | 2 hours 17 minutes | Carrier |
| 28 January 2026 | 1 hour 55 minutes | Carrier |
Delay causes
Why DL 1431 runs late
Carrier accounts for 68% of the 3,157 delay minutes carriers reported here, and the remaining four split what is left.
- 68%Carrier
- 21%National Airspace System
- 11%Late-arriving aircraft
- 0%Extreme weather
The largest share of delay minutes, 68%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 2,138 of the 3,157 delay minutes reported here. The split is drawn from 3,157 delay minutes reported on DL 1431.
Cancellations are rare at 0.27%, 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
5.2% 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 507 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 1431 is not only a SLC to PHX flight. It also flew PHX to SLC (365 flights, 87.8% 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. 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.
| Also flown as | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| PHX to SLC | 365 | 87.8% | 78 min | 0.55% | A+ |
What to do with this
Booking DL 1431
For a booking, read DL 1431 as 84.6% on time with 0.27% cancelled over 365 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- SLC to PHX, every carrier and departure
- PHX to SLC, the return direction
- SkyWest Airlines 6327 on the same route89.3%
- Delta Air Lines 1447 on the same route94.7%
- Delta Air Lines 1496 on the same route87.1%
- Delta Air Lines 1738 on the same route84.6%
- Salt Lake City International (SLC) delay statistics
- Phoenix Sky Harbor International (PHX) 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.