Flight number record

DL 391

Delta Air Lines · Atlanta to Reno

Route: ATL → RNO
Departs: 19:57
Flights: 308
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 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, 8 points worse than the national rate of 77.6%. The late ones land about an hour behind schedule. That rests on 308 flights, with a median arrival 2 minutes late.

The national on-time rate over the same period is 77.6%, so DL 391 runs 8 points behind the country as a whole. Across a thousand flights that is about 83 extra late arrivals.

On time

69.3%

Arrivals under 15 minutes late, of 303 completed flights

Avg delay

62 min

Across delayed arrivals only, not all flights

Cancelled

0.65%

National rate is 1.81%

1 hour+ late

9.9%

National rate is 8.1%

These figures cover 308 flights between July 2025 and June 2026. Beyond the headline rate, 9.9% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.

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 46 of 308 flights, with 20:06 (37 flights) and 20:00 (36 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 19:5746 flights14.9%
Departs 20:0637 flights12.0%
Departs 20:0036 flights11.7%

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 19:57 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.2%, and DL 391 runs level with that at 69.3%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.

Against the route

DL 391 next to ATL to RNO

Across its whole network Delta Air Lines managed 81.6%, which this flight trails by 12 points.

DL 391 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 391thin sample	308	69.3%	62 min	0.65%	C+
All Delta Air Lines on ATL–RNOthin sample	308	69.3%	62 min	0.65%	C+
All carriers on ATL–RNOthin sample	308	69.3%	62 min	0.65%	C+
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	B

Across the year

DL 391 quarter by quarter

Quarter by quarter DL 391 held fairly steady: 66.2% in Jul–Sep 2025, 67.7% in Oct–Dec 2025, 70.4% in Jan–Mar 2026 and 72.2% in Apr–Jun 2026. A spread of 6 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202577 flights66.2%
Oct–Dec 202568 flights67.7%
Jan–Mar 202672 flights70.4%
Apr–Jun 202691 flights72.2%

Scale runs 60% to 80%. Rows with fewer than 30 flights show a dash.

By weekday, DL 391 ranged from 62.0% on Thursday to 73.1% on Friday. With about 44 flights behind each day, a spread of 11 points is inside normal variation, so the day you fly is not worth changing for this flight.

Delay causes

Why DL 391 runs late

One category carries most of the weight here. Carrier accounts for 60% of the 5,739 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
60%
Late-arriving aircraft
18%
National Airspace System
17%
Extreme weather
5%
Security
1%

The largest share of delay minutes, 60%, 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 3,433 of the 5,739 delay minutes reported here. The split is drawn from 5,739 delay minutes reported on DL 391.

Cancellations are rare at 0.65%, 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

For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 9.9% of arrivals land a full hour or more behind schedule, against 8.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum 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 (308 flights, 75.7% 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. 308 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 391
Also flown as	Flights	On time	Avg delay	Cancelled	Grade
RNO to ATLthin sample	308	75.7%	124 min	0.97%	B+

What to do with this

Booking DL 391

For a booking, read DL 391 as 69.3% on time with 0.65% cancelled over 308 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