Flight number record
DL 346
Delta Air Lines · Denver to Atlanta
- Route
- DEN → ATL
- Departs
- 10:50
- Flights
- 339
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 346, check with Delta Air Lines.
DL 346 lands a B, 2 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 roughly 50 minutes on average. That rests on 339 flights, with a median arrival 4 minutes early.
Key figures
On time
79.2%
Arrivals under 15 minutes late, of 331 completed flights
Avg delay
49 min
Across delayed arrivals only, not all flights
Cancelled
1.47%
National rate is 1.89%
1 hour+ late
4.8%
National rate is 8.3%
These figures cover 339 flights between September 2025 and August 2026. The median arrival is 4 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.
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 346 flies
DL 346 flies DEN to ATL without a single fixed slot. Its most common scheduled departure was 10:50, used on 51 of 339 flights, with 10:31 (36 flights) next.
- Departs 10:5051 flights15.0%
- Departs 10:3136 flights10.6%
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 10:50 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and DL 346 runs 5 points worse at 79.2%. 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 346 next to DEN to ATL
Every carrier on DEN to ATL combined arrived on time 78.6% of the time across 5,603 flights, so DL 346 is about level with it. Delta flew 2,807 flights on the same city pair under all its flight numbers, including this one, and those ran 85.8% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight trails by 2 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 346thin sample | 339 | 79.2% | 49 min | 1.47% | B |
| All Delta Air Lines on DEN–ATL | 2,807 | 85.8% | 61 min | 1.18% | A |
| All carriers on DEN–ATL | 5,603 | 78.6% | 58 min | 0.93% | B+ |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 346 quarter by quarter
DL 346 did not run the same all year. Its best quarter was Jul–Sep 2025 at 86.7% on time and its weakest Oct–Dec 2025 at 73.9%, a swing of 13 points on roughly 68 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 flights86.7%
- Oct–Dec 202570 flights73.9%
- Jan–Mar 202686 flights82.1%
- Apr–Jun 202691 flights79.8%
- Jul–Sep 202662 flights76.3%
Scale runs 65% to 90%.
By weekday, DL 346 did best on Tuesday at 87.8% on time and worst on Thursday at 72.0%. Each day rests on about 48 flights, so a gap of 16 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 346 runs when it is late
The 69 late arrivals split 33 under half an hour, 20 between 30 and 60 minutes, and 16 an hour or more.
- 15+ min early60 flights18.1%
- Within 15 min202 flights61.0%
- 15–29 min late33 flights10.0%
- 30–59 min late20 flights6.0%
- 1–2 hours late13 flights3.9%
- 2+ hours late3 flights0.9%
Scale runs 0% to 100%.
Share of 331 completed flights by arrival against schedule.
14 of 61 late departures made up the time and arrived on time, 23% of them. In the other direction, 22 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 ATL.
The worst days
Worst days for DL 346
The latest arrival of the period was on 9 October 2025, 4 hours 47 minutes behind schedule; most of its delay minutes were filed as extreme weather. On three of the five worst days the largest share was filed as carrier-caused (crew, maintenance, fuelling, baggage).
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 9 October 2025 | 4 hours 47 minutes | Extreme weather |
| 8 January 2026 | 4 hours 29 minutes | Carrier |
| 17 November 2025 | 2 hours 1 minute | Carrier |
| 3 April 2026 | 1 hour 50 minutes | Carrier |
| 25 September 2025 | 1 hour 41 minutes | Extreme weather |
Delay causes
Why DL 346 runs late
Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 3,360 reported delay minutes.
- 34%Late-arriving aircraft
- 33%Carrier
- 21%National Airspace System
- 12%Extreme weather
Extreme weather accounts for 12% of delay minutes, well above the single-digit share typical across the system. Weather delays are lumpy: they arrive as whole bad days rather than as a steady drag, so the quarterly figures above are the more useful view of the risk. The national share is 6%, so this operation carries roughly 1.9 times the usual weather exposure. The split is drawn from 3,360 delay minutes reported on DL 346.
Cancellations sit at 1.47% against a national 1.89%, which is ordinary. Diversions add another 0.88%.
Connections and routes
What a delay on this flight costs
Badly late arrivals are rare here: only 4.8% 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.
The 1,199 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.
The same number turns up on one other city pair in the data, including ATL to DEN (100), but none flew often enough under DL 346 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to DEN to ATL only.
One caution: this is a thin sample. 339 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.
What to do with this
Booking DL 346
For a booking, read DL 346 as 79.2% on time with 1.47% cancelled over 339 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- DEN to ATL, every carrier and departure
- ATL to DEN, the return direction
- Delta Air Lines 341 on the same route93.9%
- Delta Air Lines 431 on the same route93.9%
- United Airlines 1305 on the same route70.9%
- Frontier Airlines 3600 on the same route70.8%
- Delta Air Lines 840 on the same route80.7%
- Frontier Airlines 3294 on the same route87.5%
- Denver International (DEN) delay statistics
- Hartsfield-Jackson Atlanta International (ATL) 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.