Flight number record

DL 1397

Delta Air Lines · Atlanta to Austin

Route: ATL → AUS
Departs: 14:20
Flights: 360
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s DL 1397, check with Delta Air Lines.

DL 1397 lands a B, level with the national rate of 77.6%. Roughly one flight in four arrives 15 minutes late or worse, and those flights are late by about 45 minutes on average. That is a workable record, not a spotless one. That rests on 360 flights, with a median arrival 10 minutes early.

On time

77.5%

Arrivals under 15 minutes late, of 355 completed flights

Avg delay

45 min

Across delayed arrivals only, not all flights

Cancelled

1.39%

National rate is 1.81%

1 hour+ late

4.5%

National rate is 8.1%

These figures cover 360 flights between July 2025 and June 2026. The median arrival is 10 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.

Schedule

When DL 1397 flies

DL 1397 flies ATL to AUS without a single fixed slot. Its most common scheduled departure was 14:20, used on 49 of 360 flights, with 14:30 (37 flights) and 14:17 (37 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 14:2049 flights13.6%
Departs 14:3037 flights10.3%
Departs 14:1737 flights10.3%

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 14:20 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 72.4%, and DL 1397 runs 5 points better at 77.5%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Against the route

DL 1397 next to ATL to AUS

Every carrier on ATL to AUS combined arrived on time 79.8% of the time across 4,545 flights, so DL 1397 is 2 points behind it. Delta flew 3,233 flights on the same city pair under all its flight numbers, including this one, and those ran 80.2% on time. Across its whole network Delta Air Lines managed 81.6%, which this flight trails by 4 points.

DL 1397 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 1397thin sample	360	77.5%	45 min	1.39%	B
All Delta Air Lines on ATL–AUS	3,233	80.2%	57 min	1.48%	B
All carriers on ATL–AUS	4,545	79.8%	58 min	1.39%	B
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	B

Across the year

DL 1397 quarter by quarter

DL 1397 did not run the same all year. Its best quarter was Jan–Mar 2026 at 88.2% on time and its weakest Jul–Sep 2025 at 64.1%, a swing of 24 points on roughly 90 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 202592 flights64.1%
Oct–Dec 202588 flights81.6%
Jan–Mar 202689 flights88.2%
Apr–Jun 202691 flights76.9%

Scale runs 55% to 95%. Rows with fewer than 30 flights show a dash.

By weekday, DL 1397 did best on Wednesday at 88.0% on time and worst on Monday at 71.2%. Each day rests on about 51 flights, so a gap of 17 points is worth noticing but could still narrow in another year.

Delay causes

Why DL 1397 runs late

One category carries most of the weight here. Carrier accounts for 44% of the 3,628 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
44%
National Airspace System
29%
Late-arriving aircraft
25%
Extreme weather
2%

The largest share of delay minutes, 44%, 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 1,590 of the 3,628 delay minutes reported here. The split is drawn from 3,628 delay minutes reported on DL 1397.

Cancellations sit at 1.39% against a national 1.81%, which is ordinary. Diversions add another 0.00%.

Connections and routes

What a delay on this flight costs

Badly late arrivals are rare here: only 4.5% land an hour or more behind schedule, against 8.1% 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 813 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. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.

DL 1397 is not only a ATL to AUS flight. It also flew AUS to ATL (346 flights, 78.1% 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. 360 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 1397
Also flown as	Flights	On time	Avg delay	Cancelled	Grade
AUS to ATLthin sample	346	78.1%	61 min	1.16%	B

What to do with this

Booking DL 1397

For a booking, read DL 1397 as 77.5% on time with 1.39% cancelled over 360 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