Flight number record
DL 780
Delta Air Lines · Austin to Seattle
- Route
- AUS → SEA
- Departs
- 06:00
- Flights
- 325
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 780, check with Delta Air Lines.
DL 780 earns an A+. Close to nine flights in ten arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 16 points better than the national rate of 77.3%. When something does go wrong the average delay runs close to two hours. That rests on 325 flights, with a median arrival 13 minutes early.
Set against the rest of the country, DL 780's record is 16 points better than the US average of 77.3%. That gap is worth roughly 156 fewer late arrivals for every thousand flights.
Key figures
On time
92.9%
Arrivals under 15 minutes late, of 322 completed flights
Avg delay
123 min
Across delayed arrivals only, not all flights
Cancelled
0.92%
National rate is 1.89%
1 hour+ late
3.7%
National rate is 8.3%
These figures cover 325 flights between September 2025 and August 2026. The median arrival is 13 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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Schedule
When DL 780 flies
DL 780 flies AUS to SEA without a single fixed slot. Its most common scheduled departure was 06:00, used on 112 of 325 flights, with 06:05 (56 flights) and 06:03 (36 flights) next.
- Departs 06:00112 flights34.5%
- Departs 06:0556 flights17.2%
- Departs 06:0336 flights11.1%
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 06:00 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and DL 780 runs 4 points better at 92.9%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
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Against the route
DL 780 next to AUS to SEA
Every carrier on AUS to SEA combined arrived on time 81.3% of the time across 2,089 flights, so DL 780 is 12 points ahead of it. Delta flew 949 flights on the same city pair under all its flight numbers, including this one, and those ran 83.8% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight beats by 12 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 780thin sample | 325 | 92.9% | 123 min | 0.92% | A+ |
| All Delta Air Lines on AUS–SEA | 949 | 83.8% | 82 min | 0.95% | B+ |
| All carriers on AUS–SEA | 2,089 | 81.3% | 61 min | 0.86% | B+ |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 780 quarter by quarter
Quarter by quarter DL 780 held fairly steady: 93.3% in Jul–Sep 2025, 90.9% in Oct–Dec 2025, 94.1% in Jan–Mar 2026, 91.2% in Apr–Jun 2026 and 96.8% in Jul–Sep 2026. A spread of 6 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Jul–Sep 202530 flights93.3%
- Oct–Dec 202591 flights90.9%
- Jan–Mar 202651 flights94.1%
- Apr–Jun 202691 flights91.2%
- Jul–Sep 202662 flights96.8%
Scale runs 80% to 100%.
By weekday, DL 780 ranged from 87.0% on Sunday to 97.8% on Wednesday. With about 46 flights behind each day, a spread of 11 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late DL 780 runs when it is late
DL 780 often beats the schedule: 146 of 322 completed flights, 45%, arrived 15 minutes or more early. When DL 780 is late it tends to be very late: 12 of its 23 late arrivals were an hour or more behind, and 8 were two hours or more.
- 15+ min early146 flights45.3%
- Within 15 min153 flights47.5%
- 15–29 min late8 flights2.5%
- 30–59 min late3 flights0.9%
- 1–2 hours late4 flights1.2%
- 2+ hours late8 flights2.5%
Scale runs 0% to 100%.
Share of 322 completed flights by arrival against schedule.
3 of 20 late departures made up the time and arrived on time, 15% of them. Only 6 left on time and still arrived late.
The worst days
Worst days for DL 780
The latest arrival of the period was on 27 May 2026, 9 hours 34 minutes behind schedule; most of its delay minutes were filed as extreme weather. Three of the five worst days fell in May 2026.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 27 May 2026 | 9 hours 34 minutes | Extreme weather |
| 1 September 2025 | 6 hours 59 minutes | Carrier |
| 24 May 2026 | 4 hours 38 minutes | Carrier |
| 13 August 2026 | 3 hours 59 minutes | Carrier |
| 5 May 2026 | 3 hours 35 minutes | Carrier |
Delay causes
Why DL 780 runs late
Carrier accounts for 73% of the 2,833 delay minutes carriers reported here, and the remaining four split what is left.
- 73%Carrier
- 22%Extreme weather
- 6%National Airspace System
Extreme weather accounts for 22% of delay minutes, well above the single-digit share typical across the system. Weather delays are lumpy: they arrive as whole bad days rather than as a steady drag, so the quarterly figures above are the more useful view of the risk. The national share is 6%, so this operation carries roughly 3.6 times the usual weather exposure. The split is drawn from 2,833 delay minutes reported on DL 780.
Cancellations sit at 0.92% against a national 1.89%, 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 3.7% land an hour or more behind schedule, against 8.3% 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.
At 1,770 miles this is transcontinental flying, and long routes get a quiet structural advantage. Scheduled block time on a flight this length carries more padding in absolute minutes, so a twenty-minute late departure often still becomes an on-time arrival. Read the on-time rate here as slightly flattering next to a short-haul route with the same operational quality.
The same number turns up on one other city pair in the data, including RSW to DTW (38), but none flew often enough under DL 780 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to AUS to SEA only.
One caution: this is a thin sample. 325 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 780
For a booking, DL 780 has one of the better records a US domestic flight can show: 92.9% on time and 0.92% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- AUS to SEA, every carrier and departure
- SEA to AUS, the return direction
- Alaska Airlines 503 on the same route84.0%
- Alaska Airlines 339 on the same route74.5%
- Austin-Bergstrom International (AUS) delay statistics
- Seattle-Tacoma International (SEA) 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
- Worst months to fly in the US, ranked by the data
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.