Flight number record

DL 565

Delta Air Lines · Detroit to Seattle

Route: DTW → SEA
Departs: 20:20
Flights: 335
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s DL 565, check with Delta Air Lines.

DL 565 draws a D+. Roughly one flight in two arrives at least 15 minutes late, and the typical late arrival is a little over an hour behind schedule. Build slack into anything you connect to. That rests on 335 flights, with a median arrival 8 minutes late.

The national on-time rate over the same period is 77.6%, so DL 565 runs 19 points behind the country as a whole. Across a thousand flights that is about 186 extra late arrivals.

On time

59.0%

Arrivals under 15 minutes late, of 332 completed flights

Avg delay

69 min

Across delayed arrivals only, not all flights

Cancelled

0.90%

National rate is 1.81%

1 hour+ late

11.4%

National rate is 8.1%

These figures cover 335 flights between July 2025 and June 2026. Beyond the headline rate, 11.4% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.

Schedule

When DL 565 flies

DL 565 flies DTW to SEA without a single fixed slot. Its most common scheduled departure was 20:20, used on 47 of 335 flights, with 19:45 (38 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 20:2047 flights14.0%
Departs 19:4538 flights11.3%

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 20:20 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.5%, and DL 565 runs 12 points worse at 59.0%. 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 565 next to DTW to SEA

Every carrier on DTW to SEA combined arrived on time 73.2% of the time across 2,076 flights, so DL 565 is 14 points behind it. Delta flew 1,535 flights on the same city pair under all its flight numbers, including this one, and those ran 72.6% on time. Across its whole network Delta Air Lines managed 81.6%, which this flight trails by 23 points.

DL 565 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 565thin sample	335	59.0%	69 min	0.90%	D+
All Delta Air Lines on DTW–SEA	1,535	72.6%	55 min	1.04%	C
All carriers on DTW–SEA	2,076	73.2%	54 min	0.87%	C+
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	B

Across the year

DL 565 quarter by quarter

DL 565 did not run the same all year. Its best quarter was Oct–Dec 2025 at 64.0% on time and its weakest Jan–Mar 2026 at 50.0%, a swing of 14 points on roughly 84 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 202578 flights63.6%
Oct–Dec 202589 flights64.0%
Jan–Mar 202682 flights50.0%
Apr–Jun 202686 flights58.1%

Scale runs 40% to 70%. Rows with fewer than 30 flights show a dash.

By weekday, DL 565 did best on Tuesday at 73.5% on time and worst on Sunday at 49.0%. Each day rests on about 48 flights, so a gap of 25 points is worth noticing but could still narrow in another year.

Delay causes

Why DL 565 runs late

One category carries most of the weight here. Carrier accounts for 57% of the 9,390 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
57%
National Airspace System
21%
Late-arriving aircraft
21%
Extreme weather
1%

The largest share of delay minutes, 57%, 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 5,357 of the 9,390 delay minutes reported here. The split is drawn from 9,390 delay minutes reported on DL 565.

Cancellations sit at 0.90% against a national 1.81%, which is ordinary. Diversions add another 0.00%.

Connections and routes

What a delay on this flight costs

For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 11.4% of arrivals land a full hour or more behind schedule, against 8.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum here, and two hours if the onward flight is on a separate ticket.

At 1,927 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.

Every one of the 335 flights under DL 565 in the data flew DTW to SEA. 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. 335 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 565

For a booking, DL 565 is one of the weaker ways to fly DTW to SEA: 14 points below the route as a whole. If the schedule allows, compare it with the other departures listed on the route page before settling on this one.

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