Flight number record

DL 348

Delta Air Lines · Atlanta to Phoenix

Route: ATL → PHX
Departs: 08:10
Flights: 365
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s DL 348, check with Delta Air Lines.

DL 348 lands a B+, 2 points better than the national rate of 77.6%. About one flight in five arrives 15 minutes late or worse, and those flights are late by roughly 40 minutes on average. That is a workable record, not a spotless one. That rests on 365 flights, with a median arrival right on schedule.

On time

79.8%

Arrivals under 15 minutes late, of 362 completed flights

Avg delay

42 min

Across delayed arrivals only, not all flights

Cancelled

0.82%

National rate is 1.81%

1 hour+ late

3.0%

National rate is 8.1%

These figures cover 365 flights between July 2025 and June 2026. On-time means an arrival less than 15 minutes after the scheduled gate time, the same threshold the Department of Transportation uses in its own reports. Cancelled and diverted flights are excluded from the on-time rate and counted separately, which is why the cancellation column matters on its own.

Schedule

When DL 348 flies

DL 348 flies ATL to PHX without a single fixed slot. Its most common scheduled departure was 08:10, used on 142 of 365 flights, with 08:15 (47 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 08:10142 flights38.9%
Departs 08:1547 flights12.9%

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 08:10 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 84.1%, and DL 348 runs 4 points worse at 79.8%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.

Against the route

DL 348 next to ATL to PHX

Every carrier on ATL to PHX combined arrived on time 75.4% of the time across 3,762 flights, so DL 348 is 4 points ahead of it. Delta flew 2,301 flights on the same city pair under all its flight numbers, including this one, and those ran 76.0% on time. Across its whole network Delta Air Lines managed 81.6%, which this flight trails by 2 points.

DL 348 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 348	365	79.8%	42 min	0.82%	B+
All Delta Air Lines on ATL–PHX	2,301	76.0%	59 min	0.87%	B+
All carriers on ATL–PHX	3,762	75.4%	63 min	0.72%	B+
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	B

Across the year

DL 348 quarter by quarter

Quarter by quarter DL 348 held fairly steady: 78.3% in Jul–Sep 2025, 82.6% in Oct–Dec 2025, 79.5% in Jan–Mar 2026 and 78.9% in Apr–Jun 2026. A spread of 4 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202592 flights78.3%
Oct–Dec 202592 flights82.6%
Jan–Mar 202690 flights79.5%
Apr–Jun 202691 flights78.9%

Scale runs 70% to 90%. Rows with fewer than 30 flights show a dash.

By weekday, DL 348 ranged from 73.1% on Thursday to 82.7% on Wednesday. With about 52 flights behind each day, a spread of 10 points is inside normal variation, so the day you fly is not worth changing for this flight.

Delay causes

Why DL 348 runs late

One category carries most of the weight here. Carrier accounts for 57% of the 3,030 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
57%
National Airspace System
39%
Extreme weather
3%
Late-arriving aircraft
1%

The largest share of delay minutes, 57%, 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 1,730 of the 3,030 delay minutes reported here. The split is drawn from 3,030 delay minutes reported on DL 348.

Cancellations are rare at 0.82%, 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 3.0% 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.

At 1,587 miles this is transcontinental flying, and long routes get a quiet structural advantage. Scheduled block time on a flight this length carries more padding in absolute minutes, so a twenty-minute late departure often still becomes an on-time arrival. Read the on-time rate here as slightly flattering next to a short-haul route with the same operational quality.

DL 348 is not only a ATL to PHX flight. It also flew PHX to ATL (341 flights, 83.5% 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 348
Also flown as	Flights	On time	Avg delay	Cancelled	Grade
PHX to ATLthin sample	341	83.5%	78 min	0.29%	B+

What to do with this

Booking DL 348

For a booking, read DL 348 as 79.8% on time with 0.82% cancelled over 365 flights. Those are rates from the past twelve months, not a forecast for any particular 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