Flight number record
DL 391
Delta Air Lines · Atlanta to Reno
- Route
- ATL → RNO
- Departs
- 19:57
- Flights
- 310
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 391, check with Delta Air Lines.
DL 391 sits in the middle of the pack with a C+. About seven flights in ten arrive on time by the DOT's definition, 7 points worse than the national rate of 77.3%. The late ones land about an hour behind schedule. That rests on 310 flights, with a median arrival 1 minute late.
The national on-time rate over the same period is 77.3%, so DL 391 runs 7 points behind the country as a whole. Across a thousand flights that is about 69 extra late arrivals.
Key figures
On time
70.4%
Arrivals under 15 minutes late, of 304 completed flights
Avg delay
57 min
Across delayed arrivals only, not all flights
Cancelled
0.97%
National rate is 1.89%
1 hour+ late
9.5%
National rate is 8.3%
These figures cover 310 flights between September 2025 and August 2026. Beyond the headline rate, 9.5% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When DL 391 flies
DL 391 flies ATL to RNO without a single fixed slot. Its most common scheduled departure was 19:57, used on 78 of 310 flights, with 20:06 (37 flights) next.
- Departs 19:5778 flights25.2%
- Departs 20:0637 flights11.9%
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 19:57 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.0%, and DL 391 runs 2 points better at 70.4%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
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Against the route
DL 391 next to ATL to RNO
Across its whole network Delta Air Lines managed 81.1%, which this flight trails by 11 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 391thin sample | 310 | 70.4% | 57 min | 0.97% | C+ |
| All Delta Air Lines on ATL–RNOthin sample | 310 | 70.4% | 57 min | 0.97% | C+ |
| All carriers on ATL–RNOthin sample | 310 | 70.4% | 57 min | 0.97% | C+ |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 391 quarter by quarter
Quarter by quarter DL 391 held fairly steady: 67.7% in Oct–Dec 2025, 70.4% in Jan–Mar 2026, 72.2% in Apr–Jun 2026 and 70.2% in Jul–Sep 2026. A spread of 5 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Jul–Sep 202521 flights—
- Oct–Dec 202568 flights67.7%
- Jan–Mar 202672 flights70.4%
- Apr–Jun 202691 flights72.2%
- Jul–Sep 202658 flights70.2%
Scale runs 60% to 80%. Rows with fewer than 30 flights show a dash.
By weekday, DL 391 did best on Monday at 74.5% on time and worst on Thursday at 60.0%. Each day rests on about 44 flights, so a gap of 15 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 391 runs when it is late
The 90 late arrivals split 32 under half an hour, 29 between 30 and 60 minutes, and 29 an hour or more.
- 15+ min early50 flights16.4%
- Within 15 min164 flights53.9%
- 15–29 min late32 flights10.5%
- 30–59 min late29 flights9.5%
- 1–2 hours late17 flights5.6%
- 2+ hours late12 flights3.9%
Scale runs 0% to 100%.
Share of 304 completed flights by arrival against schedule.
19 of 94 late departures made up the time and arrived on time, 20% of them. 15 flights left on time and still arrived late.
The worst days
Worst days for DL 391
The latest arrival of the period was on 6 March 2026, 3 hours 31 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 a late-arriving aircraft.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 6 March 2026 | 3 hours 31 minutes | Extreme weather |
| 23 August 2026 | 3 hours 4 minutes | Carrier |
| 18 June 2026 | 2 hours 32 minutes | Late-arriving aircraft |
| 10 October 2025 | 2 hours 27 minutes | Late-arriving aircraft |
| 29 April 2026 | 2 hours 13 minutes | Late-arriving aircraft |
Delay causes
Why DL 391 runs late
Carrier accounts for 54% of the 5,103 delay minutes carriers reported here, and the remaining four split what is left.
- 54%Carrier
- 22%Late-arriving aircraft
- 19%National Airspace System
- 5%Extreme weather
The largest share of delay minutes, 54%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 2,763 of the 5,103 delay minutes reported here. The split is drawn from 5,103 delay minutes reported on DL 391.
Cancellations sit at 0.97% against a national 1.89%, which is ordinary. Diversions add another 0.97%.
Connections and routes
What a delay on this flight costs
9.5% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection here, and two hours if the onward flight is on a separate ticket.
At 1,993 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 391 is not only a ATL to RNO flight. It also flew RNO to ATL (310 flights, 75.8% 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. 310 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 |
|---|---|---|---|---|---|
| RNO to ATLthin sample | 310 | 75.8% | 128 min | 1.29% | B |
What to do with this
Booking DL 391
For a booking, read DL 391 as 70.4% on time with 0.97% cancelled over 310 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- 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
- How often a connection fails at the major US hubs
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.