Flight number record
DL 739
Delta Air Lines · Seattle to Austin
- Route
- SEA → AUS
- Departs
- 07:15
- Flights
- 281
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 739, check with Delta Air Lines.
DL 739 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 12 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 281 flights, with a median arrival 12 minutes early.
Set against the rest of the country, DL 739's record is 12 points better than the US average of 77.3%. That gap is worth roughly 119 fewer late arrivals for every thousand flights.
Key figures
On time
89.2%
Arrivals under 15 minutes late, of 279 completed flights
Avg delay
87 min
Across delayed arrivals only, not all flights
Cancelled
0.36%
National rate is 1.89%
1 hour+ late
3.9%
National rate is 8.3%
These figures cover 281 flights between September 2025 and August 2026. The median arrival is 12 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 739 flies
DL 739 flies SEA to AUS without a single fixed slot. Its most common scheduled departure was 07:15, used on 139 of 281 flights, with 07:20 (128 flights) next.
- Departs 07:15139 flights49.5%
- Departs 07:20128 flights45.6%
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 07:15 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and DL 739 runs level with that at 89.2%. 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 739 next to SEA to AUS
Every carrier on SEA to AUS combined arrived on time 78.5% of the time across 2,090 flights, so DL 739 is 11 points ahead of it. Delta flew 950 flights on the same city pair under all its flight numbers, including this one, and those ran 80.1% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight beats by 8 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 739thin sample | 281 | 89.2% | 87 min | 0.36% | A+ |
| All Delta Air Lines on SEA–AUS | 950 | 80.1% | 67 min | 1.05% | B |
| All carriers on SEA–AUS | 2,090 | 78.5% | 55 min | 0.81% | B+ |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 739 quarter by quarter
DL 739 did not run the same all year. Its best quarter was Jul–Sep 2025 at 96.7% on time and its weakest Apr–Jun 2026 at 85.4%, a swing of 11 points on roughly 70 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 flights96.7%
- Oct–Dec 202579 flights89.6%
- Jan–Mar 202621 flights—
- Apr–Jun 202689 flights85.4%
- Jul–Sep 202662 flights91.9%
Scale runs 75% to 100%. Rows with fewer than 30 flights show a dash.
By weekday, DL 739 did best on Tuesday at 97.6% on time and worst on Thursday at 82.9%. Each day rests on about 40 flights, so a gap of 15 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 739 runs when it is late
DL 739 often beats the schedule: 115 of 279 completed flights, 41%, arrived 15 minutes or more early. The 30 late arrivals split 8 under half an hour, 11 between 30 and 60 minutes, and 11 an hour or more.
- 15+ min early115 flights41.2%
- Within 15 min134 flights48.0%
- 15–29 min late8 flights2.9%
- 30–59 min late11 flights3.9%
- 1–2 hours late7 flights2.5%
- 2+ hours late4 flights1.4%
Scale runs 0% to 100%.
Share of 279 completed flights by arrival against schedule.
7 of 26 late departures made up the time and arrived on time, 27% of them. 11 flights left on time and still arrived late.
The worst days
Worst days for DL 739
The latest arrival of the period was on 11 October 2025, 8 hours 16 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 |
|---|---|---|
| 11 October 2025 | 8 hours 16 minutes | Carrier |
| 5 November 2025 | 5 hours 27 minutes | Carrier |
| 24 August 2026 | 4 hours 33 minutes | Carrier |
| 8 November 2025 | 3 hours 10 minutes | Carrier |
| 17 April 2026 | 1 hour 53 minutes | Carrier |
Delay causes
Why DL 739 runs late
Carrier accounts for 77% of the 2,597 delay minutes carriers reported here, and the remaining four split what is left.
- 77%Carrier
- 18%National Airspace System
- 4%Late-arriving aircraft
The largest share of delay minutes, 77%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 2,006 of the 2,597 delay minutes reported here. The split is drawn from 2,597 delay minutes reported on DL 739.
Cancellations are rare at 0.36%, 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 routes
What a delay on this flight costs
Badly late arrivals are rare here: only 3.9% 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 three other city pairs in the data, including SNA to MSP (32), ATL to PNS (12) and PNS to ATL (12), but none flew often enough under DL 739 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to SEA to AUS only.
One caution: this is a thin sample. 281 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 739
For a booking, DL 739 has one of the better records a US domestic flight can show: 89.2% on time and 0.36% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- SEA to AUS, every carrier and departure
- AUS to SEA, the return direction
- Delta Air Lines 831 on the same route78.7%
- Delta Air Lines 848 on the same route73.5%
- Alaska Airlines 502 on the same route83.1%
- Alaska Airlines 352 on the same route84.3%
- Alaska Airlines 372 on the same route77.6%
- Seattle-Tacoma International (SEA) 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
- 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.