Flight number record
DL 1170
Delta Air Lines · Atlanta to Austin
- Route
- ATL → AUS
- Departs
- 18:59
- Flights
- 319
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 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. Close to three flights in four arrive on time by the DOT's definition, 4 points worse than the national rate of 77.3%. The late ones land about an hour behind schedule. That rests on 319 flights, with a median arrival 5 minutes early.
The national on-time rate over the same period is 77.3%, so DL 1170 runs 4 points behind the country as a whole. Across a thousand flights that is about 43 extra late arrivals.
Key figures
On time
73.0%
Arrivals under 15 minutes late, of 315 completed flights
Avg delay
65 min
Across delayed arrivals only, not all flights
Cancelled
1.25%
National rate is 1.89%
1 hour+ late
10.8%
National rate is 8.3%
These figures cover 319 flights between September 2025 and August 2026. Beyond the headline rate, 10.8% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When DL 1170 flies
DL 1170 flies ATL to AUS without a single fixed slot. Its most common scheduled departure was 18:59, used on 99 of 319 flights, with 19:49 (57 flights) and 20:10 (45 flights) next.
- Departs 18:5999 flights31.0%
- Departs 19:4957 flights17.9%
- Departs 20:1045 flights14.1%
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 18:59 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.0%, and DL 1170 runs 5 points better at 73.0%. 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 1170 next to ATL to AUS
Every carrier on ATL to AUS combined arrived on time 81.0% of the time across 4,497 flights, so DL 1170 is 8 points behind it. Delta flew 3,163 flights on the same city pair under all its flight numbers, including this one, and those ran 81.9% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight trails by 8 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 1170thin sample | 319 | 73.0% | 65 min | 1.25% | C |
| All Delta Air Lines on ATL–AUS | 3,163 | 81.9% | 58 min | 1.49% | B |
| All carriers on ATL–AUS | 4,497 | 81.0% | 59 min | 1.27% | B |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 1170 quarter by quarter
DL 1170 did not run the same all year. Its best quarter was Jul–Sep 2025 at 83.3% on time and its weakest Jul–Sep 2026 at 60.7%, a swing of 23 points on roughly 64 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 202530 flights83.3%
- Oct–Dec 202590 flights78.4%
- Jan–Mar 202654 flights75.5%
- Apr–Jun 202683 flights71.1%
- Jul–Sep 202662 flights60.7%
Scale runs 50% to 90%.
By weekday, DL 1170 did best on Wednesday at 85.0% on time and worst on Sunday at 61.7%. Each day rests on about 46 flights, so a gap of 23 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 1170 runs when it is late
DL 1170 often beats the schedule: 86 of 315 completed flights, 27%, arrived 15 minutes or more early. The 85 late arrivals split 16 under half an hour, 35 between 30 and 60 minutes, and 34 an hour or more.
- 15+ min early86 flights27.3%
- Within 15 min144 flights45.7%
- 15–29 min late16 flights5.1%
- 30–59 min late35 flights11.1%
- 1–2 hours late22 flights7.0%
- 2+ hours late12 flights3.8%
Scale runs 0% to 100%.
Share of 315 completed flights by arrival against schedule.
27 of 106 late departures made up the time and arrived on time, 25% of them. Only 6 left on time and still arrived late.
The worst days
Worst days for DL 1170
The latest arrival of the period was on 11 August 2026, 4 hours 15 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The five worst days are spread across August, July, May, June and September, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 11 August 2026 | 4 hours 15 minutes | Carrier |
| 9 July 2026 | 3 hours 24 minutes | Late-arriving aircraft |
| 22 May 2026 | 3 hours 9 minutes | Late-arriving aircraft |
| 18 June 2026 | 2 hours 55 minutes | Extreme weather |
| 27 September 2025 | 2 hours 43 minutes | Carrier |
Delay causes
Why DL 1170 runs late
Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 5,516 reported delay minutes.
- 40%Carrier
- 40%Late-arriving aircraft
- 14%National Airspace System
- 6%Extreme weather
40% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 5,516 reported delay minutes here, that single category outweighs weather by 7 to one. The split is drawn from 5,516 delay minutes reported on DL 1170.
Cancellations sit at 1.25% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and routes
What a delay on this flight costs
10.8% 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.
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.
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: 8 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 2886 on the same route88.5%
- Delta Air Lines 1397 on the same route80.0%
- Delta Air Lines 2976 on the same route93.4%
- Delta Air Lines 1491 on the same route74.7%
- Delta Air Lines 2104 on the same route85.4%
- Delta Air Lines 2011 on the same route88.8%
- 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, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.