Flight number record
DL 565
Delta Air Lines · Detroit to Seattle
- Route
- DTW → SEA
- Departs
- 20:34
- Flights
- 339
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 565, check with Delta Air Lines.
DL 565 draws a D+. Roughly one flight in three 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 339 flights, with a median arrival 7 minutes late.
The national on-time rate over the same period is 77.3%, so DL 565 runs 16 points behind the country as a whole. Across a thousand flights that is about 157 extra late arrivals.
Key figures
On time
61.6%
Arrivals under 15 minutes late, of 336 completed flights
Avg delay
82 min
Across delayed arrivals only, not all flights
Cancelled
0.88%
National rate is 1.89%
1 hour+ late
11.9%
National rate is 8.3%
These figures cover 339 flights between September 2025 and August 2026. Beyond the headline rate, 11.9% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When DL 565 flies
DL 565 flies DTW to SEA without a single fixed slot. Its most common scheduled departure was 20:34, used on 57 of 339 flights, with 20:05 (46 flights) and 19:45 (38 flights) next.
- Departs 20:3457 flights16.8%
- Departs 20:0546 flights13.6%
- Departs 19:4538 flights11.2%
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 20:34 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.1%, and DL 565 runs 8 points worse at 61.6%. 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 565 next to DTW to SEA
Every carrier on DTW to SEA combined arrived on time 72.8% of the time across 2,067 flights, so DL 565 is 11 points behind it. Delta flew 1,518 flights on the same city pair under all its flight numbers, including this one, and those ran 71.3% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight trails by 19 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 565thin sample | 339 | 61.6% | 82 min | 0.88% | D+ |
| All Delta Air Lines on DTW–SEA | 1,518 | 71.3% | 57 min | 0.79% | C+ |
| All carriers on DTW–SEA | 2,067 | 72.8% | 56 min | 0.68% | C+ |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 565 quarter by quarter
DL 565 did not run the same all year. Its best quarter was Jul–Sep 2026 at 73.8% on time and its weakest Jan–Mar 2026 at 50.0%, a swing of 24 points on roughly 85 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 202520 flights—
- Oct–Dec 202589 flights64.0%
- Jan–Mar 202682 flights50.0%
- Apr–Jun 202686 flights58.1%
- Jul–Sep 202662 flights73.8%
Scale runs 40% to 80%. Rows with fewer than 30 flights show a dash.
By weekday, DL 565 did best on Tuesday at 75.5% on time and worst on Sunday at 50.0%. Each day rests on about 48 flights, so a gap of 26 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 565 runs when it is late
The 129 late arrivals split 33 under half an hour, 56 between 30 and 60 minutes, and 40 an hour or more.
- 15+ min early48 flights14.3%
- Within 15 min159 flights47.3%
- 15–29 min late33 flights9.8%
- 30–59 min late56 flights16.7%
- 1–2 hours late23 flights6.8%
- 2+ hours late17 flights5.1%
Scale runs 0% to 100%.
Share of 336 completed flights by arrival against schedule.
23 of 122 late departures made up the time and arrived on time, 19% of them. In the other direction, 30 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at SEA.
The worst days
Worst days for DL 565
The latest arrival of the period was on 19 May 2026, 18 hours 9 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 |
|---|---|---|
| 19 May 2026 | 18 hours 9 minutes | Carrier |
| 4 August 2026 | 14 hours 7 minutes | Carrier |
| 5 June 2026 | 13 hours 54 minutes | Carrier |
| 5 July 2026 | 5 hours 16 minutes | Carrier |
| 14 December 2025 | 4 hours 28 minutes | Late-arriving aircraft |
Delay causes
Why DL 565 runs late
Carrier accounts for 63% of the 11,000 delay minutes carriers reported here, and the remaining four split what is left.
- 63%Carrier
- 18%National Airspace System
- 18%Late-arriving aircraft
- 1%Extreme weather
The largest share of delay minutes, 63%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 6,664 of the 11,000 delay minutes reported here. The split is drawn from 10,540 delay minutes reported on DL 565.
Cancellations are rare at 0.88%, 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
11.9% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection 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 339 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. 339 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: 11 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.
Related
Where to go next
- DTW to SEA, every carrier and departure
- SEA to DTW, the return direction
- Delta Air Lines 734 on the same route73.9%
- Delta Air Lines 728 on the same route76.7%
- Alaska Airlines 313 on the same route75.1%
- Delta Air Lines 944 on the same route67.3%
- Detroit Metropolitan Wayne County (DTW) delay statistics
- 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
- How often a connection fails at the major US hubs
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.