Flight number record
DL 1170
Delta Air Lines · Atlanta to Austin
- Route
- ATL → AUS
- Departs
- 19:49
- Flights
- 319
- Period
- July 2025 to June 2026
Historical statistics for July 2025 to June 2026, not live status. For today’s DL 1170, check with Delta Air Lines.
DL 1170 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 77.6%. The late ones land about an hour behind schedule. That rests on 319 flights, with a median arrival 4 minutes early.
The national on-time rate over the same period is 77.6%, so DL 1170 runs 7 points behind the country as a whole. Across a thousand flights that is about 67 extra late arrivals.
Key figures
On time
70.9%
Arrivals under 15 minutes late, of 313 completed flights
Avg delay
61 min
Across delayed arrivals only, not all flights
Cancelled
1.88%
National rate is 1.81%
1 hour+ late
10.5%
National rate is 8.1%
These figures cover 319 flights between July 2025 and June 2026. Beyond the headline rate, 10.5% 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 1170 flies
DL 1170 flies ATL to AUS without a single fixed slot. Its most common scheduled departure was 19:49, used on 84 of 319 flights, with 18:59 (49 flights) and 20:10 (45 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.
- Departs 19:4984 flights26.3%
- Departs 18:5949 flights15.4%
- Departs 20:1045 flights14.1%
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 19:49 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.2%, and DL 1170 runs 3 points better at 70.9%. 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 1170 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 1170 is 9 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 11 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 1170thin sample | 319 | 70.9% | 61 min | 1.88% | C |
| 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 1170 quarter by quarter
DL 1170 did not run the same all year. Its best quarter was Oct–Dec 2025 at 78.4% on time and its weakest Jul–Sep 2025 at 60.7%, a swing of 18 points on roughly 80 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 flights60.7%
- Oct–Dec 202590 flights78.4%
- Jan–Mar 202654 flights75.5%
- Apr–Jun 202683 flights71.1%
Scale runs 50% to 85%. Rows with fewer than 30 flights show a dash.
By weekday, DL 1170 did best on Tuesday at 80.5% on time and worst on Sunday at 65.2%. Each day rests on about 46 flights, so a gap of 15 points is worth noticing but could still narrow in another year.
Delay causes
Why DL 1170 runs late
One category carries most of the weight here. Carrier accounts for 46% of the 5,501 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.
- 46%Carrier
- 32%Late-arriving aircraft
- 16%National Airspace System
- 7%Extreme weather
The largest share of delay minutes, 46%, 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 2,511 of the 5,501 delay minutes reported here. The split is drawn from 5,501 delay minutes reported on DL 1170.
Cancellations sit at 1.88% against a national 1.81%, which is ordinary. Diversions add another 0.00%.
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. 10.5% 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.
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.
The same number turns up on one other city pair in the data, including ATL to CHA (5), but none flew often enough under DL 1170 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to ATL to AUS only.
One caution: this is a thin sample. 319 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 1170
For a booking, DL 1170 is one of the weaker ways to fly ATL to AUS: 9 points below the route as a whole. If the schedule allows, compare it with the other departures listed on the route page before settling on this one.
Related
Where to go next
- ATL to AUS, every carrier and departure
- AUS to ATL, the return direction
- Delta Air Lines 2976 on the same route93.2%
- Delta Air Lines 2886 on the same route86.9%
- Delta Air Lines 1397 on the same route77.5%
- Delta Air Lines 1491 on the same route74.4%
- Delta Air Lines 2104 on the same route84.2%
- Delta Air Lines 1060 on the same route73.4%
- Hartsfield-Jackson Atlanta International (ATL) delay statistics
- Austin-Bergstrom International (AUS) 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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.