Flight number record
DL 348
Delta Air Lines · Atlanta to Phoenix
- Route
- ATL → PHX
- Departs
- 08:10
- Flights
- 365
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 348, check with Delta Air Lines.
DL 348 lands a B+, 3 points better than the national rate of 77.3%. About one flight in five arrives 15 minutes late or worse, and those flights are late by about 40 minutes on average. That rests on 365 flights, with a median arrival 1 minute early.
Key figures
On time
80.1%
Arrivals under 15 minutes late, of 362 completed flights
Avg delay
40 min
Across delayed arrivals only, not all flights
Cancelled
0.82%
National rate is 1.89%
1 hour+ late
2.8%
National rate is 8.3%
These figures cover 365 flights between September 2025 and August 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.
Fare search by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
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 175 of 365 flights, with 08:15 (75 flights) next.
- Departs 08:10175 flights47.9%
- Departs 08:1575 flights20.5%
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 08:10 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and DL 348 runs 4 points worse at 80.1%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
Timetable by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Against the route
DL 348 next to ATL to PHX
Every carrier on ATL to PHX combined arrived on time 75.2% of the time across 3,693 flights, so DL 348 is 5 points ahead of it. Delta flew 2,280 flights on the same city pair under all its flight numbers, including this one, and those ran 75.9% on time. Across its whole network Delta Air Lines managed 81.1%, close to this flight's figure.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 348 | 365 | 80.1% | 40 min | 0.82% | B+ |
| All Delta Air Lines on ATL–PHX | 2,280 | 75.9% | 57 min | 0.88% | B+ |
| All carriers on ATL–PHX | 3,693 | 75.2% | 63 min | 0.79% | B+ |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 348 quarter by quarter
DL 348 did not run the same all year. Its best quarter was Jul–Sep 2026 at 87.1% on time and its weakest Jul–Sep 2025 at 63.3%, a swing of 24 points on roughly 73 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 flights63.3%
- Oct–Dec 202592 flights82.6%
- Jan–Mar 202690 flights79.5%
- Apr–Jun 202691 flights78.9%
- Jul–Sep 202662 flights87.1%
Scale runs 55% to 95%.
By weekday, DL 348 ranged from 73.1% on Thursday to 84.6% on Friday. With about 52 flights behind each day, a spread of 12 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late DL 348 runs when it is late
Most of the lateness is short. 40 of the 72 late arrivals were under half an hour behind, and 10 reached an hour or more.
- 15+ min early54 flights14.9%
- Within 15 min236 flights65.2%
- 15–29 min late40 flights11.0%
- 30–59 min late22 flights6.1%
- 1–2 hours late7 flights1.9%
- 2+ hours late3 flights0.8%
Scale runs 0% to 100%.
Share of 362 completed flights by arrival against schedule.
A late pushback is often recovered here: of 49 departures that left 15 minutes late or more, 16 still arrived on time. In the other direction, 39 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at PHX.
The worst days
Worst days for DL 348
The latest arrival of the period was on 9 November 2025, 3 hours 19 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 |
|---|---|---|
| 9 November 2025 | 3 hours 19 minutes | Carrier |
| 29 January 2026 | 2 hours 21 minutes | Carrier |
| 24 September 2025 | 2 hours 8 minutes | Carrier |
| 12 March 2026 | 1 hour 52 minutes | Carrier |
| 7 March 2026 | 1 hour 33 minutes | Extreme weather |
Delay causes
Why DL 348 runs late
Carrier accounts for 53% of the 2,875 delay minutes carriers reported here, and the remaining four split what is left.
- 53%Carrier
- 42%National Airspace System
- 3%Extreme weather
- 3%Late-arriving aircraft
The largest share of delay minutes, 53%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 1,525 of the 2,875 delay minutes reported here. The split is drawn from 2,875 delay minutes reported on DL 348.
Cancellations are rare at 0.82%, 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
Badly late arrivals are rare here: only 2.8% land an hour or more behind schedule, against 8.3% 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, 82.0% 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 ATLthin sample | 341 | 82.0% | 74 min | 0.29% | B+ |
What to do with this
Booking DL 348
For a booking, read DL 348 as 80.1% on time with 0.82% cancelled over 365 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- ATL to PHX, every carrier and departure
- PHX to ATL, the return direction
- Delta Air Lines 836 on the same route69.9%
- Delta Air Lines 757 on the same route70.2%
- Delta Air Lines 796 on the same route79.6%
- Delta Air Lines 842 on the same route72.8%
- Hartsfield-Jackson Atlanta International (ATL) 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.