Flight number record

DL 812

Delta Air Lines · Seattle to Detroit

Route: SEA → DTW
Departs: 06:00
Flights: 365
Period: September 2025 to August 2026

Historical statistics for September 2025 to August 2026, not live status. For today’s DL 812, check with Delta Air Lines.

DL 812 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 15 points better than the national rate of 77.3%. When something does go wrong the average delay runs an hour and a half. That rests on 365 flights, with a median arrival 13 minutes early.

Set against the rest of the country, DL 812's record is 15 points better than the US average of 77.3%. That gap is worth roughly 147 fewer late arrivals for every thousand flights.

On time

92.0%

Arrivals under 15 minutes late, of 361 completed flights

Avg delay

92 min

Across delayed arrivals only, not all flights

Cancelled

0.55%

National rate is 1.89%

1 hour+ late

2.8%

National rate is 8.3%

These figures cover 365 flights between September 2025 and August 2026. The median arrival is 13 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 812 flies

DL 812 flies SEA to DTW without a single fixed slot. Its most common scheduled departure was 06:00, used on 209 of 365 flights, with 05:30 (117 flights) and 06:05 (38 flights) next.

Departs 06:00209 flights57.3%
Departs 05:30117 flights32.1%
Departs 06:0538 flights10.4%

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 06:00 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and DL 812 runs 3 points better at 92.0%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.

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Against the route

DL 812 next to SEA to DTW

Every carrier on SEA to DTW combined arrived on time 86.6% of the time across 2,063 flights, so DL 812 is 5 points ahead of it. Delta flew 1,515 flights on the same city pair under all its flight numbers, including this one, and those ran 87.1% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight beats by 11 points.

DL 812 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 812	365	92.0%	92 min	0.55%	A+
All Delta Air Lines on SEA–DTW	1,515	87.1%	71 min	0.86%	A+
All carriers on SEA–DTW	2,063	86.6%	65 min	0.68%	A+
Delta Air Lines, whole network	1,039,517	81.1%	71 min	1.74%	B

Across the year

DL 812 quarter by quarter

Quarter by quarter DL 812 held fairly steady: 90.0% in Jul–Sep 2025, 93.5% in Oct–Dec 2025, 93.3% in Jan–Mar 2026, 91.0% in Apr–Jun 2026 and 90.2% in Jul–Sep 2026. A spread of 4 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202530 flights90.0%
Oct–Dec 202592 flights93.5%
Jan–Mar 202690 flights93.3%
Apr–Jun 202691 flights91.0%
Jul–Sep 202662 flights90.2%

Scale runs 80% to 100%.

By weekday, DL 812 ranged from 86.3% on Sunday to 94.3% on Monday. With about 52 flights behind each day, a spread of 8 points is inside normal variation, so the day you fly is not worth changing for this flight.

Arrival by arrival

How late DL 812 runs when it is late

DL 812 often beats the schedule: 163 of 361 completed flights, 45%, arrived 15 minutes or more early. Most of the lateness is short. 15 of the 29 late arrivals were under half an hour behind, and 10 reached an hour or more.

15+ min early163 flights45.2%
Within 15 min169 flights46.8%
15–29 min late15 flights4.2%
30–59 min late4 flights1.1%
1–2 hours late3 flights0.8%
2+ hours late7 flights1.9%

Scale runs 0% to 100%.

Share of 361 completed flights by arrival against schedule.

7 of 24 late departures made up the time and arrived on time, 29% of them. 12 flights left on time and still arrived late.

The worst days

Worst days for DL 812

The latest arrival of the period was on 20 May 2026, 12 hours 28 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. On three of the five worst days the largest share was filed as carrier-caused (crew, maintenance, fuelling, baggage).

The latest arrivals of DL 812 in the period
Date	Arrived late by	Largest filed cause
20 May 2026	12 hours 28 minutes	Late-arriving aircraft
13 March 2026	5 hours 26 minutes	Extreme weather
9 May 2026	4 hours 17 minutes	Carrier
10 October 2025	2 hours 52 minutes	Carrier
12 March 2026	2 hours 30 minutes	Carrier

Delay causes

Why DL 812 runs late

Carrier accounts for 48% of the 2,678 delay minutes carriers reported here, and the remaining four split what is left.

Carrier
48%
Late-arriving aircraft
28%
National Airspace System
13%
Extreme weather
11%
Security
1%

Extreme weather accounts for 11% of delay minutes, well above the single-digit share typical across the system. Weather delays are lumpy: they arrive as whole bad days rather than as a steady drag, so the quarterly figures above are the more useful view of the risk. The national share is 6%, so this operation carries roughly 1.9 times the usual weather exposure. The split is drawn from 2,678 delay minutes reported on DL 812.

Cancellations are rare at 0.55%, 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

Badly late arrivals are rare here: only 2.8% 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 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 365 flights under DL 812 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. 365 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 812

For a booking, DL 812 has one of the better records a US domestic flight can show: 92.0% on time and 0.55% 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, September 2025 to August 2026. Last updated 22 October 2026; recomputed monthly. How this data is collected.

Key figures