Flight number record

DL 485

Delta Air Lines · Kailua-Kona to Seattle

Route: KOA → SEA
Departs: 20:50
Flights: 348
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s DL 485, check with Delta Air Lines.

DL 485 earns an A. Nearly every flight arrives 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 77.6%. When something does go wrong the average delay runs about 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 16 points better than the US average of 77.6%. That gap is worth roughly 156 fewer late arrivals for every thousand flights.

On time

93.2%

Arrivals under 15 minutes late, of 340 completed flights

Avg delay

40 min

Across delayed arrivals only, not all flights

Cancelled

2.30%

National rate is 1.81%

1 hour+ late

1.8%

National rate is 8.1%

These figures cover 348 flights between July 2025 and June 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.

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 79 of 348 flights, with 21:47 (65 flights) and 21:30 (52 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 20:5079 flights22.7%
Departs 21:4765 flights18.7%
Departs 21:3052 flights14.9%

Scale runs 0% to 100%. Rows with fewer than 30 flights show a dash.

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 70.5%, and DL 485 runs 23 points better at 93.2%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.

Against the route

DL 485 next to KOA to SEA

Every carrier on KOA to SEA combined arrived on time 87.2% of the time across 1,422 flights, so DL 485 is 6 points ahead of it. Across its whole network Delta Air Lines managed 81.6%, which this flight beats by 12 points.

DL 485 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 485thin sample	348	93.2%	40 min	2.30%	A
All Delta Air Lines on KOA–SEA	365	91.5%	46 min	2.74%	A
All carriers on KOA–SEA	1,422	87.2%	58 min	2.18%	A
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	B

Across the year

DL 485 quarter by quarter

DL 485 did not run the same all year. Its best quarter was Jul–Sep 2025 at 97.8% on time and its weakest Jan–Mar 2026 at 87.8%, a swing of 10 points on roughly 87 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 202592 flights97.8%
Oct–Dec 202580 flights93.5%
Jan–Mar 202685 flights87.8%
Apr–Jun 202691 flights93.3%

Scale runs 80% to 100%. Rows with fewer than 30 flights show a dash.

By weekday, DL 485 did best on Tuesday at 98.0% on time and worst on Wednesday at 86.0%. Each day rests on about 50 flights, so a gap of 12 points is worth noticing but could still narrow in another year.

Delay causes

Why DL 485 runs late

One category carries most of the weight here. Carrier accounts for 72% of the 911 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.

Carrier
72%
National Airspace System
22%
Late-arriving aircraft
5%

The largest share of delay minutes, 72%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 660 of the 911 delay minutes reported here. The split is drawn from 911 delay minutes reported on DL 485.

Cancellations sit at 2.30% against a national 1.81%, 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 1.8% land an hour or more behind schedule, against 8.1% 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, read DL 485 as 93.2% on time with 2.30% cancelled over 348 flights. Those are rates from the past twelve months, not a forecast for any particular day.

Where to go next

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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.

Key figures