Flight number record
DL 485
Delta Air Lines · Kailua-Kona to Seattle
- Route
- KOA → SEA
- Departs
- 20:50
- Flights
- 348
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 485, check with Delta Air Lines.
DL 485 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 14 points better than the national rate of 77.3%. When something does go wrong the average delay runs roughly 40 minutes. That rests on 348 flights, with a median arrival 17 minutes early.
Set against the rest of the country, DL 485's record is 14 points better than the US average of 77.3%. That gap is worth roughly 138 fewer late arrivals for every thousand flights.
Key figures
On time
91.1%
Arrivals under 15 minutes late, of 337 completed flights
Avg delay
41 min
Across delayed arrivals only, not all flights
Cancelled
2.87%
National rate is 1.89%
1 hour+ late
2.1%
National rate is 8.3%
These figures cover 348 flights between September 2025 and August 2026. The median arrival is 17 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 485 flies
DL 485 flies KOA to SEA without a single fixed slot. Its most common scheduled departure was 20:50, used on 85 of 348 flights, with 21:55 (61 flights) and 21:30 (52 flights) next.
- Departs 20:5085 flights24.4%
- Departs 21:5561 flights17.5%
- Departs 21:3052 flights14.9%
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 20:50 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.1%, and DL 485 runs 21 points better at 91.1%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
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Against the route
DL 485 next to KOA to SEA
Every carrier on KOA to SEA combined arrived on time 86.7% of the time across 1,412 flights, so DL 485 is 4 points ahead of it. Across its whole network Delta Air Lines managed 81.1%, which this flight beats by 10 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 485thin sample | 348 | 91.1% | 41 min | 2.87% | A |
| All Delta Air Lines on KOA–SEA | 365 | 89.5% | 47 min | 3.29% | A− |
| All carriers on KOA–SEA | 1,412 | 86.7% | 56 min | 2.27% | A |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 485 quarter by quarter
Quarter by quarter DL 485 held fairly steady: 93.3% in Jul–Sep 2025, 93.5% in Oct–Dec 2025, 87.8% in Jan–Mar 2026, 93.3% in Apr–Jun 2026 and 87.9% 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 202580 flights93.5%
- Jan–Mar 202685 flights87.8%
- Apr–Jun 202691 flights93.3%
- Jul–Sep 202662 flights87.9%
Scale runs 80% to 100%.
By weekday, DL 485 ranged from 84.0% on Wednesday to 95.9% on Tuesday. With about 50 flights behind each day, a spread of 12 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late DL 485 runs when it is late
DL 485 often beats the schedule: 187 of 337 completed flights, 55%, arrived 15 minutes or more early. Most of the lateness is short. 15 of the 30 late arrivals were under half an hour behind, and 7 reached an hour or more.
- 15+ min early187 flights55.5%
- Within 15 min120 flights35.6%
- 15–29 min late15 flights4.5%
- 30–59 min late8 flights2.4%
- 1–2 hours late6 flights1.8%
- 2+ hours late1 flights0.3%
Scale runs 0% to 100%.
Share of 337 completed flights by arrival against schedule.
A late pushback is often recovered here: of 31 departures that left 15 minutes late or more, 13 still arrived on time. 12 flights left on time and still arrived late.
The worst days
Worst days for DL 485
The latest arrival of the period was on 5 August 2026, 2 hours 35 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. On four of the five worst days the largest share was filed as carrier-caused (crew, maintenance, fuelling, baggage).
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 5 August 2026 | 2 hours 35 minutes | Late-arriving aircraft |
| 11 September 2025 | 1 hour 41 minutes | Carrier |
| 23 May 2026 | 1 hour 39 minutes | Carrier |
| 10 September 2025 | 1 hour 25 minutes | Carrier |
| 5 March 2026 | 1 hour 19 minutes | Carrier |
Delay causes
Why DL 485 runs late
Carrier accounts for 61% of the 1,237 delay minutes carriers reported here, and the remaining four split what is left.
- 61%Carrier
- 19%Late-arriving aircraft
- 19%National Airspace System
The largest share of delay minutes, 61%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 760 of the 1,237 delay minutes reported here. The split is drawn from 1,237 delay minutes reported on DL 485.
Cancellations run at 2.87%, against 1.89% nationally. That is roughly one flight in 30 cancelled outright. A cancelled flight is invisible in every on-time figure on this page, so the punctuality numbers above describe only the flights that actually operated.
Connections and routes
What a delay on this flight costs
Badly late arrivals are rare here: only 2.1% 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 2,688 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 two other city pairs in the data, including CLT to MSP (13) and CLT to ATL (3), but none flew often enough under DL 485 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to KOA to SEA only.
One caution: this is a thin sample. 348 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 485
For a booking, the cancellation rate is the figure to plan around on DL 485: 2.87% of its 348 scheduled flights did not operate. A late arrival costs roughly 40 minutes, but a cancellation costs the day, so leave a later option open.
Related
Where to go next
- KOA to SEA, every carrier and departure
- SEA to KOA, the return direction
- Alaska Airlines 205 on the same route81.0%
- 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
- What a cancellation rate actually tells you (and what it hides)
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.