Flight number record
DL 1016
Delta Air Lines · Seattle to Salt Lake City
- Route
- SEA → SLC
- Departs
- 09:25
- Flights
- 365
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 1016, check with Delta Air Lines.
DL 1016 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 13 points better than the national rate of 77.3%. When something does go wrong the average delay runs roughly 50 minutes. That rests on 365 flights, with a median arrival 12 minutes early.
Set against the rest of the country, DL 1016's record is 13 points better than the US average of 77.3%. That gap is worth roughly 127 fewer late arrivals for every thousand flights.
Key figures
On time
90.0%
Arrivals under 15 minutes late, of 361 completed flights
Avg delay
52 min
Across delayed arrivals only, not all flights
Cancelled
0.82%
National rate is 1.89%
1 hour+ late
2.5%
National rate is 8.3%
These figures cover 365 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 1016 flies
DL 1016 flies SEA to SLC without a single fixed slot. Its most common scheduled departure was 09:25, used on 106 of 365 flights, with 09:30 (98 flights) and 09:40 (59 flights) next.
- Departs 09:25106 flights29.0%
- Departs 09:3098 flights26.8%
- Departs 09:4059 flights16.2%
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 09:25 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and DL 1016 runs 6 points better at 90.0%. 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 1016 next to SEA to SLC
Every carrier on SEA to SLC combined arrived on time 83.4% of the time across 4,098 flights, so DL 1016 is 7 points ahead of it. Delta flew 2,232 flights on the same city pair under all its flight numbers, including this one, and those ran 86.8% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight beats by 9 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 1016 | 365 | 90.0% | 52 min | 0.82% | A+ |
| All Delta Air Lines on SEA–SLC | 2,232 | 86.8% | 59 min | 0.49% | A+ |
| All carriers on SEA–SLC | 4,098 | 83.4% | 49 min | 0.78% | B+ |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 1016 quarter by quarter
Quarter by quarter DL 1016 held fairly steady: 93.3% in Jul–Sep 2025, 84.6% in Oct–Dec 2025, 90.8% in Jan–Mar 2026, 93.4% in Apr–Jun 2026 and 90.3% in Jul–Sep 2026. A spread of 9 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 202592 flights84.6%
- Jan–Mar 202690 flights90.8%
- Apr–Jun 202691 flights93.4%
- Jul–Sep 202662 flights90.3%
Scale runs 75% to 100%.
By weekday, DL 1016 ranged from 86.5% on Thursday to 96.2% on Sunday. With about 52 flights behind each day, a spread of 10 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late DL 1016 runs when it is late
DL 1016 often beats the schedule: 148 of 361 completed flights, 41%, arrived 15 minutes or more early. Most of the lateness is short. 18 of the 36 late arrivals were under half an hour behind, and 9 reached an hour or more.
- 15+ min early148 flights41.0%
- Within 15 min177 flights49.0%
- 15–29 min late18 flights5.0%
- 30–59 min late9 flights2.5%
- 1–2 hours late6 flights1.7%
- 2+ hours late3 flights0.8%
Scale runs 0% to 100%.
Share of 361 completed flights by arrival against schedule.
10 of 34 late departures made up the time and arrived on time, 29% of them. 12 flights left on time and still arrived late.
The worst days
Worst days for DL 1016
The latest arrival of the period was on 6 January 2026, 3 hours 43 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on four of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 6 January 2026 | 3 hours 43 minutes | Carrier |
| 13 March 2026 | 3 hours 37 minutes | Extreme weather |
| 2 September 2025 | 3 hours 19 minutes | Carrier |
| 25 February 2026 | 1 hour 31 minutes | Carrier |
| 27 December 2025 | 1 hour 28 minutes | Carrier |
Delay causes
Why DL 1016 runs late
Carrier accounts for 66% of the 1,879 delay minutes carriers reported here, and the remaining four split what is left.
- 66%Carrier
- 23%National Airspace System
- 8%Extreme weather
- 3%Late-arriving aircraft
The largest share of delay minutes, 66%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 1,247 of the 1,879 delay minutes reported here. The split is drawn from 1,879 delay minutes reported on DL 1016.
Cancellations are rare at 0.82%, 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 2.5% 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.
The 689 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.
Every one of the 365 flights under DL 1016 in the data flew SEA to SLC. The number was not reused on any other city pair, which makes this a clean record of one route.
One caution: this is a thin sample. 365 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 1016
For a booking, DL 1016 has one of the better records a US domestic flight can show: 90.0% on time and 0.82% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- SEA to SLC, every carrier and departure
- SLC to SEA, the return direction
- Delta Air Lines 1120 on the same route83.0%
- Delta Air Lines 1128 on the same route93.7%
- Delta Air Lines 1265 on the same route85.1%
- Delta Air Lines 1165 on the same route80.4%
- SkyWest Airlines 3298 on the same route79.3%
- Alaska Airlines 733 on the same route68.4%
- Seattle-Tacoma International (SEA) delay statistics
- Salt Lake City International (SLC) 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.