Carrier route record
DLSLC→AUS
Delta Air Lines · Salt Lake City to Austin
- 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 SLC to AUS lands a B+, 6 points better than the national rate of 77.3%. About one flight in six arrives 15 minutes late or worse, and those flights are late by about an hour on average. That rests on 1,072 flights, with a median arrival 8 minutes early.
Set against the rest of the country, Delta's SLC to AUS record is 6 points better than the US average of 77.3%. That gap is worth roughly 59 fewer late arrivals for every thousand flights.
Key figures
On time
83.2%
Arrivals under 15 minutes late, of 1,061 completed flights
Avg delay
62 min
Across delayed arrivals only, not all flights
Cancelled
0.65%
National rate is 1.89%
Whole route
81.5%
Every carrier on SLC to AUS, 1,796 flights
These figures cover 1,072 flights between September 2025 and August 2026. The median arrival is 8 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 SLC to AUS
Delta flew 1,072 of the 1,796 flights on SLC to AUS, most of the route. Its 83.2% on time is 2 points better than the route as a whole, which runs 81.5%. Ranked by on-time rate it is number two of three carriers on the route, where the range runs from SkyWest at 84.5% to Southwest at 76.2%. 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 |
|---|---|---|---|---|---|
| SkyWest Airlinesthin sample | 242 | 84.5% | 50 min | 0.83% | B+ |
| Delta Air Lines (this page) | 1,072 | 83.2% | 62 min | 0.65% | B+ |
| Southwest Airlines | 482 | 76.2% | 50 min | 0.62% | B+ |
Flight by flight
Delta flight numbers on SLC to AUS
Timetable by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Departure window
When Delta runs best on this route
Departure time is the single lever a traveller controls, and it moves the odds more than most people expect. Each bar below is the on-time rate for flights scheduled to leave inside that window, across 1,072 flights.
- 5am–8am70 flights87.0%
- 8am–11am280 flights87.1%
- 11am–2pm145 flights83.9%
- 2pm–5pm213 flights81.5%
- 5pm–8pm363 flights80.2%
- 8pm–5am1 flights—
Scale runs 70% to 95%. Rows with fewer than 30 flights show a dash.
The early departures do better, though not dramatically: 87.1% on time for the 8am–11am window against 80.2% for 5pm–8pm. Worth taking if the schedule allows, not worth an extra connection. The 5pm–8pm window is the busiest, with 363 flights scheduled in it.
Across the year
Delta on SLC to AUS through the year
July is the worst month at 72.3% on time, 18 points below February, the best at 90.5%. Summer afternoon convection and peak-season schedules land on the same weeks every year, so this is a pattern you can book around rather than a run of bad luck. March was the busiest month here, with 93 flights.
Across the week, Saturday is the strongest day at 88.3% on time and Monday the weakest at 76.6%, a spread of 12 points.
Arrival by arrival
How late Delta on SLC to AUS runs when it is late
Delta on SLC to AUS often beats the schedule: 336 of 1,061 completed flights, 32%, arrived 15 minutes or more early. The 178 late arrivals split 68 under half an hour, 54 between 30 and 60 minutes, and 56 an hour or more.
- 15+ min early336 flights31.7%
- Within 15 min547 flights51.6%
- 15–29 min late68 flights6.4%
- 30–59 min late54 flights5.1%
- 1–2 hours late30 flights2.8%
- 2+ hours late26 flights2.5%
Scale runs 0% to 100%.
Share of 1,061 completed flights by arrival against schedule.
38 of 173 late departures made up the time and arrived on time, 22% of them. 43 flights left on time and still arrived late.
The worst days
Worst days for Delta on SLC to AUS
The latest arrival of the period was on 30 October 2025, 4 hours 30 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 |
|---|---|---|
| 30 October 2025 | 4 hours 30 minutes | Carrier |
| 26 January 2026 | 4 hours 20 minutes | Carrier |
| 20 July 2026 | 4 hours 15 minutes | Carrier |
| 18 August 2026 | 4 hours 7 minutes | Carrier |
| 13 July 2026 | 3 hours 58 minutes | Carrier |
Delay causes
Why Delta runs late on this route
Carrier accounts for 57% of the 11,000 delay minutes carriers reported here, and the remaining four split what is left.
- 57%Carrier
- 21%Late-arriving aircraft
- 17%National Airspace System
- 4%Extreme weather
The largest share of delay minutes, 57%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 6,296 of the 11,000 delay minutes reported here. The split is drawn from 11,029 reported delay minutes.
Cancellations are rare at 0.65%, 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
5.3% 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 about an hour, 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 86.0% 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 SLC to AUS
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 83.2% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 1,061 completed flights over 12 months sit behind that.
Related
Where to go next
- SLC to AUS, every carrier
- Delta on AUS to SLC, the return leg
- SkyWest Airlines on SLC to AUS84.5%
- Southwest Airlines on SLC to AUS76.2%
- Delta Air Lines network-wide record
- Salt Lake City International (SLC) delay statistics
- Austin-Bergstrom International (AUS) delay statistics
- Worst months to fly in the US, ranked by the data
- How to read this site: grades, sample sizes, and honest caveats
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.