Carrier route record
DLAUS→SLC
Delta Air Lines · Austin to Salt Lake City
- Flights
- 1,072
- Period
- September 2025 to August 2026
- Share of route
- 60%
- Carriers
- 3
Historical statistics for September 2025 to August 2026, not live status. For today’s flights, check with Delta Air Lines.
Delta on AUS to SLC earns an A+. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 9 points better than the national rate of 77.3%. When something does go wrong the average delay runs an hour and a half. That rests on 1,072 flights, with a median arrival 10 minutes early.
Set against the rest of the country, Delta's AUS to SLC record is 9 points better than the US average of 77.3%. That gap is worth roughly 87 fewer late arrivals for every thousand flights.
Key figures
On time
86.0%
Arrivals under 15 minutes late, of 1,063 completed flights
Avg delay
94 min
Across delayed arrivals only, not all flights
Cancelled
0.84%
National rate is 1.89%
Whole route
81.1%
Every carrier on AUS to SLC, 1,798 flights
These figures cover 1,072 flights between September 2025 and August 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.
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Carrier by carrier
Delta against every carrier on AUS to SLC
Delta flew 1,072 of the 1,798 flights on AUS to SLC, most of the route. Its 86.0% on time is 5 points better than the route as a whole, which runs 81.1%. Ranked by on-time rate it is first of three carriers on the route, where the range runs from Delta at 86.0% to Southwest at 68.0%. One of those carriers flew fewer than 365 flights here, so treat their positions as rough.
Only one carrier clears this site's 365-flight floor here, so there is no comparison to draw. The table below is the full picture.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Delta Air Lines (this page) | 1,072 | 86.0% | 94 min | 0.84% | A+ |
| SkyWest Airlinesthin sample | 244 | 85.8% | 82 min | 1.23% | A |
| Southwest Airlines | 482 | 68.0% | 58 min | 0.21% | C+ |
Flight by flight
Delta flight numbers on AUS to SLC
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Departure window
When Delta runs best on this route
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 15 points, against half a point between the best and worst carrier.
- 5am–8am48 flights89.4%
- 8am–11am317 flights95.3%
- 11am–2pm346 flights82.8%
- 2pm–5pm4 flights—
- 5pm–8pm356 flights80.7%
- 8pm–5am1 flights—
Scale runs 70% to 100%. Rows with fewer than 30 flights show a dash.
Book the morning departure. Flights leaving between 8am–11am arrive on time 95.3% of the time, against 80.7% for the evening window. That is 15 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 5pm–8pm window is the busiest, with 356 flights scheduled in it.
Across the year
Delta on AUS to SLC through the year
January is the weak month at 78.9% on time, against 95.6% in September. Winter delays cluster: a single storm system can account for most of a month's shortfall, so an average December hides both very good weeks and genuinely unflyable days. January was the busiest month here, with 93 flights.
Across the week, Tuesday is the strongest day at 90.3% on time and Thursday the weakest at 82.1%, a spread of 8 points.
Arrival by arrival
How late Delta on AUS to SLC runs when it is late
Delta on AUS to SLC often beats the schedule: 370 of 1,063 completed flights, 35%, arrived 15 minutes or more early. The 149 late arrivals split 51 under half an hour, 37 between 30 and 60 minutes, and 61 an hour or more.
- 15+ min early370 flights34.8%
- Within 15 min544 flights51.2%
- 15–29 min late51 flights4.8%
- 30–59 min late37 flights3.5%
- 1–2 hours late20 flights1.9%
- 2+ hours late41 flights3.9%
Scale runs 0% to 100%.
Share of 1,063 completed flights by arrival against schedule.
28 of 157 late departures made up the time and arrived on time, 18% of them. Only 20 left on time and still arrived late.
The worst days
Worst days for Delta on AUS to SLC
The latest arrival of the period was on 15 February 2026, 9 hours 15 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on five of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 15 February 2026 | 9 hours 15 minutes | Carrier |
| 8 November 2025 | 8 hours 11 minutes | Carrier |
| 20 December 2025 | 7 hours 19 minutes | Carrier |
| 11 December 2025 | 6 hours 38 minutes | Carrier |
| 1 October 2025 | 5 hours 42 minutes | Carrier |
Delay causes
Why Delta runs late on this route
Carrier accounts for 51% of the 14,000 delay minutes carriers reported here, and the remaining four split what is left.
- 51%Carrier
- 38%Late-arriving aircraft
- 6%National Airspace System
- 4%Extreme weather
- 0%Security
38% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 14,000 reported delay minutes here, that single category outweighs weather by 10 to one. The split is drawn from 13,938 reported delay minutes.
The largest share of delay minutes, 51%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 7,106 of the 14,000 delay minutes reported here.
Cancellations are rare at 0.84%, below the national 1.89% 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 stage length
What a delay here costs
5.7% of arrivals land an hour or more late, close to the national 8.3%, so a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last an hour and a half, which a normal layover absorbs.
The 1,086 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 return leg runs 83.2% on time across 1,072 flights, within 3 points of this direction. The two legs are scored separately because they usually differ; on this city pair they happen not to.
One caution: this is a thin sample. 1,072 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 Delta on AUS to SLC
Put together: treat all of this as provisional. 1,072 flights over twelve months is enough to clear this site's floor and not enough to be confident to better than a couple of points. The 86.0% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 1,063 completed flights over 12 months sit behind that.
Related
Where to go next
- AUS to SLC, every carrier
- Delta on SLC to AUS, the return leg
- SkyWest Airlines on AUS to SLC85.8%
- Southwest Airlines on AUS to SLC68.0%
- Delta Air Lines network-wide record
- Austin-Bergstrom International (AUS) delay statistics
- Salt Lake City International (SLC) delay statistics
- Why the first flight of the morning is statistically safest
- The best time of day to fly, according to 7.05 million flight records
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.