Flight number record
DL 431
Delta Air Lines · Denver to Atlanta
- Route
- DEN → ATL
- Departs
- 07:05
- Flights
- 365
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 431, check with Delta Air Lines.
DL 431 earns an A. Nearly every flight arrives inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 17 points better than the national rate of 77.3%. When something does go wrong the average delay runs close to two hours. That rests on 365 flights, with a median arrival 12 minutes early.
Set against the rest of the country, DL 431's record is 17 points better than the US average of 77.3%. That gap is worth roughly 166 fewer late arrivals for every thousand flights.
Key figures
On time
93.9%
Arrivals under 15 minutes late, of 358 completed flights
Avg delay
101 min
Across delayed arrivals only, not all flights
Cancelled
1.64%
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. The median arrival is 12 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 431 flies
DL 431 flies DEN to ATL without a single fixed slot. Its most common scheduled departure was 07:05, used on 190 of 365 flights, with 07:15 (57 flights) and 07:00 (43 flights) next.
- Departs 07:05190 flights52.1%
- Departs 07:1557 flights15.6%
- Departs 07:0043 flights11.8%
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 07:05 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and DL 431 runs 5 points better at 93.9%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
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Against the route
DL 431 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 431 is 15 points ahead of 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 beats by 13 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 431 | 365 | 93.9% | 101 min | 1.64% | A |
| 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 431 quarter by quarter
Quarter by quarter DL 431 held fairly steady: 96.7% in Jul–Sep 2025, 93.3% in Oct–Dec 2025, 93.1% in Jan–Mar 2026, 94.4% in Apr–Jun 2026 and 93.4% in Jul–Sep 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 202530 flights96.7%
- Oct–Dec 202592 flights93.3%
- Jan–Mar 202690 flights93.1%
- Apr–Jun 202691 flights94.4%
- Jul–Sep 202662 flights93.4%
Scale runs 85% to 100%.
By weekday, DL 431 ranged from 90.0% on Sunday to 98.0% on Saturday. With about 52 flights behind each day, a spread of 8 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late DL 431 runs when it is late
DL 431 often beats the schedule: 141 of 358 completed flights, 39%, arrived 15 minutes or more early. The 22 late arrivals split 6 under half an hour, 6 between 30 and 60 minutes, and 10 an hour or more.
- 15+ min early141 flights39.4%
- Within 15 min195 flights54.5%
- 15–29 min late6 flights1.7%
- 30–59 min late6 flights1.7%
- 1–2 hours late4 flights1.1%
- 2+ hours late6 flights1.7%
Scale runs 0% to 100%.
Share of 358 completed flights by arrival against schedule.
6 of 25 late departures made up the time and arrived on time, 24% of them. Only 3 left on time and still arrived late.
The worst days
Worst days for DL 431
The latest arrival of the period was on 17 April 2026, 8 hours 48 minutes behind schedule; most of its delay minutes were filed as extreme weather. On four of the five worst days the largest share was filed as carrier-caused (crew, maintenance, fuelling, baggage).
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 17 April 2026 | 8 hours 48 minutes | Extreme weather |
| 1 February 2026 | 4 hours 43 minutes | Carrier |
| 5 May 2026 | 4 hours 43 minutes | Carrier |
| 6 July 2026 | 2 hours 55 minutes | Carrier |
| 24 June 2026 | 2 hours 14 minutes | Carrier |
Delay causes
Why DL 431 runs late
Carrier accounts for 66% of the 2,230 delay minutes carriers reported here, and the remaining four split what is left.
- 66%Carrier
- 24%Extreme weather
- 10%National Airspace System
Extreme weather accounts for 24% 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 3.9 times the usual weather exposure. The split is drawn from 2,230 delay minutes reported on DL 431.
Cancellations sit at 1.64% against a national 1.89%, which is ordinary. Diversions add another 0.27%.
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.
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.
Every one of the 365 flights under DL 431 in the data flew DEN to ATL. The number was not reused on any other city pair, which makes this a clean record of one route.
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.
What to do with this
Booking DL 431
For a booking, read DL 431 as 93.9% on time with 1.64% cancelled over 365 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%
- United Airlines 1305 on the same route70.9%
- Delta Air Lines 346 on the same route79.2%
- 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
- 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.