Flight number record

DL 810

Delta Air Lines · Seattle to Detroit

Route: SEA → DTW
Departs: 23:15
Flights: 361
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s DL 810, check with Delta Air Lines.

DL 810 earns an A. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 8 points better than the national rate of 77.6%. When something does go wrong the average delay runs about an hour. That rests on 361 flights, with a median arrival 6 minutes early.

Set against the rest of the country, DL 810's record is 8 points better than the US average of 77.6%. That gap is worth roughly 75 fewer late arrivals for every thousand flights.

On time

85.1%

Arrivals under 15 minutes late, of 356 completed flights

Avg delay

66 min

Across delayed arrivals only, not all flights

Cancelled

1.39%

National rate is 1.81%

1 hour+ late

4.5%

National rate is 8.1%

These figures cover 361 flights between July 2025 and June 2026. The median arrival is 6 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 810 flies

DL 810 flies SEA to DTW without a single fixed slot. Its most common scheduled departure was 23:15, used on 120 of 361 flights, with 23:10 (94 flights) and 23:50 (41 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 23:15120 flights33.2%
Departs 23:1094 flights26.0%
Departs 23:5041 flights11.4%

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 23:15 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.5%, and DL 810 runs 15 points better at 85.1%. 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 810 next to SEA to DTW

Every carrier on SEA to DTW combined arrived on time 84.7% of the time across 2,072 flights, so DL 810 is about level with it. Delta flew 1,532 flights on the same city pair under all its flight numbers, including this one, and those ran 85.3% on time. Across its whole network Delta Air Lines managed 81.6%, which this flight beats by 4 points.

DL 810 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 810thin sample	361	85.1%	66 min	1.39%	A
All Delta Air Lines on SEA–DTW	1,532	85.3%	65 min	1.04%	A
All carriers on SEA–DTW	2,072	84.7%	59 min	0.82%	B+
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	B

Across the year

DL 810 quarter by quarter

DL 810 did not run the same all year. Its best quarter was Oct–Dec 2025 at 92.1% on time and its weakest Jul–Sep 2025 at 71.4%, a swing of 21 points on roughly 90 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 flights71.4%
Oct–Dec 202590 flights92.1%
Jan–Mar 202689 flights89.5%
Apr–Jun 202690 flights87.8%

Scale runs 65% to 100%. Rows with fewer than 30 flights show a dash.

By weekday, DL 810 did best on Tuesday at 94.3% on time and worst on Friday at 78.0%. Each day rests on about 52 flights, so a gap of 16 points is worth noticing but could still narrow in another year.

Delay causes

Why DL 810 runs late

One category carries most of the weight here. Carrier accounts for 54% of the 3,518 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
54%
Late-arriving aircraft
40%
National Airspace System
6%

40% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 3,518 reported delay minutes here, that single category outweighs weather by 40 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 3,518 delay minutes reported on DL 810.

Cancellations sit at 1.39% 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 4.5% 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 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 361 flights under DL 810 in the data flew SEA to DTW. 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. 361 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 810

For a booking, DL 810 has one of the better records a US domestic flight can show: 85.1% on time and 1.39% cancelled. That is a base rate, not a promise about any single 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