Flight number record

DL 1431

Delta Air Lines · Salt Lake City to Phoenix

Route: SLC → PHX
Departs: 11:30
Flights: 365
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s DL 1431, check with Delta Air Lines.

DL 1431 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 77.6%. When something does go wrong the average delay runs roughly 55 minutes. That rests on 365 flights, with a median arrival 6 minutes early.

Set against the rest of the country, DL 1431's record is 8 points better than the US average of 77.6%. That gap is worth roughly 78 fewer late arrivals for every thousand flights.

On time

85.4%

Arrivals under 15 minutes late, of 363 completed flights

Avg delay

53 min

Across delayed arrivals only, not all flights

Cancelled

0.27%

National rate is 1.81%

1 hour+ late

4.7%

National rate is 8.1%

These figures cover 365 flights between July 2025 and June 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.

Schedule

When DL 1431 flies

DL 1431 flies SLC to PHX without a single fixed slot. Its most common scheduled departure was 11:30, used on 149 of 365 flights, with 11:25 (90 flights) and 11:35 (50 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 11:30149 flights40.8%
Departs 11:2590 flights24.7%
Departs 11:3550 flights13.7%

Scale runs 0% to 100%. Rows with fewer than 30 flights show a dash.

Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.

A 11:30 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.8%, and DL 1431 runs 7 points better at 85.4%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Against the route

DL 1431 next to SLC to PHX

Every carrier on SLC to PHX combined arrived on time 83.9% of the time across 5,759 flights, so DL 1431 is 2 points ahead of it. Delta flew 1,708 flights on the same city pair under all its flight numbers, including this one, and those ran 87.9% on time. Across its whole network Delta Air Lines managed 81.6%, which this flight beats by 4 points.

DL 1431 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 1431	365	85.4%	53 min	0.27%	A+
All Delta Air Lines on SLC–PHX	1,708	87.9%	56 min	0.53%	A+
All carriers on SLC–PHX	5,759	83.9%	71 min	0.56%	B+
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	B

Across the year

DL 1431 quarter by quarter

DL 1431 did not run the same all year. Its best quarter was Jul–Sep 2025 at 93.4% on time and its weakest Oct–Dec 2025 at 76.1%, a swing of 17 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 202592 flights93.4%
Oct–Dec 202592 flights76.1%
Jan–Mar 202690 flights84.3%
Apr–Jun 202691 flights87.9%

Scale runs 70% to 100%. 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.

Delay causes

Why DL 1431 runs late

One category carries most of the weight here. Carrier accounts for 64% of the 2,793 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.

Carrier
64%
National Airspace System
22%
Late-arriving aircraft
14%
Extreme weather
1%

The largest share of delay minutes, 64%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 1,782 of the 2,793 delay minutes reported here. The split is drawn from 2,793 delay minutes reported on DL 1431.

Cancellations are rare at 0.27%, below the national 1.81% 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

Badly late arrivals are rare here: only 4.7% land an hour or more behind schedule, against 8.1% 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.

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. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.

DL 1431 is not only a SLC to PHX flight. It also flew PHX to SLC (330 flights, 88.1% 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.

Other routes flown as DL 1431
Also flown as	Flights	On time	Avg delay	Cancelled	Grade
PHX to SLCthin sample	330	88.1%	77 min	0.61%	A+

What to do with this

Booking DL 1431

For a booking, DL 1431 has one of the better records a US domestic flight can show: 85.4% on time and 0.27% cancelled. That is a base rate, not a promise about any single day.

Where to go next

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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.

Key figures