Flight number record
DL 810
Delta Air Lines · Seattle to Detroit
- Route
- SEA → DTW
- Departs
- 23:15
- Flights
- 361
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 810, check with Delta Air Lines.
DL 810 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 12 points better than the national rate of 77.3%. When something does go wrong the average delay runs a little over an hour. That rests on 361 flights, with a median arrival 7 minutes early.
Set against the rest of the country, DL 810's record is 12 points better than the US average of 77.3%. That gap is worth roughly 123 fewer late arrivals for every thousand flights.
Key figures
On time
89.6%
Arrivals under 15 minutes late, of 357 completed flights
Avg delay
76 min
Across delayed arrivals only, not all flights
Cancelled
1.11%
National rate is 1.89%
1 hour+ late
3.1%
National rate is 8.3%
These figures cover 361 flights between September 2025 and August 2026. The median arrival is 7 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 810 flies
DL 810 flies SEA to DTW without a single fixed slot. Its most common scheduled departure was 23:15, used on 140 of 361 flights, with 23:10 (129 flights) next.
- Departs 23:15140 flights38.8%
- Departs 23:10129 flights35.7%
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 23:15 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.1%, and DL 810 runs 20 points better at 89.6%. 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 810 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 810 is 3 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 9 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 810thin sample | 361 | 89.6% | 76 min | 1.11% | 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 810 quarter by quarter
Quarter by quarter DL 810 held fairly steady: 83.3% in Jul–Sep 2025, 92.1% in Oct–Dec 2025, 89.5% in Jan–Mar 2026, 87.8% in Apr–Jun 2026 and 91.9% in Jul–Sep 2026. A spread of 9 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Jul–Sep 202530 flights83.3%
- Oct–Dec 202590 flights92.1%
- Jan–Mar 202689 flights89.5%
- Apr–Jun 202690 flights87.8%
- Jul–Sep 202662 flights91.9%
Scale runs 75% to 100%.
By weekday, DL 810 ranged from 86.3% on Sunday to 98.1% on Tuesday. With about 52 flights behind each day, a spread of 12 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late DL 810 runs when it is late
DL 810 often beats the schedule: 111 of 357 completed flights, 31%, arrived 15 minutes or more early. The 37 late arrivals split 11 under half an hour, 15 between 30 and 60 minutes, and 11 an hour or more.
- 15+ min early111 flights31.1%
- Within 15 min209 flights58.5%
- 15–29 min late11 flights3.1%
- 30–59 min late15 flights4.2%
- 1–2 hours late7 flights2.0%
- 2+ hours late4 flights1.1%
Scale runs 0% to 100%.
Share of 357 completed flights by arrival against schedule.
A late pushback is often recovered here: of 78 departures that left 15 minutes late or more, 43 still arrived on time. Only 2 left on time and still arrived late.
The worst days
Worst days for DL 810
The latest arrival of the period was on 20 April 2026, 13 hours 18 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 20 April 2026 | 13 hours 18 minutes | Carrier |
| 14 December 2025 | 4 hours 32 minutes | Late-arriving aircraft |
| 16 January 2026 | 2 hours 37 minutes | Carrier |
| 3 May 2026 | 2 hours 19 minutes | Late-arriving aircraft |
| 12 October 2025 | 1 hour 33 minutes | Carrier |
Delay causes
Why DL 810 runs late
Carrier accounts for 58% of the 2,817 delay minutes carriers reported here, and the remaining four split what is left.
- 58%Carrier
- 39%Late-arriving aircraft
- 3%National Airspace System
39% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 2,817 reported delay minutes here, that single category outweighs weather by 39 to one. The split is drawn from 2,817 delay minutes reported on DL 810.
Cancellations sit at 1.11% against a national 1.89%, 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 3.1% 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 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: 89.6% on time and 1.11% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- SEA to DTW, every carrier and departure
- DTW to SEA, the return direction
- Delta Air Lines 812 on the same route92.0%
- Alaska Airlines 313 on the same route85.3%
- Delta Air Lines 533 on the same route85.1%
- Delta Air Lines 1706 on the same route80.8%
- Seattle-Tacoma International (SEA) delay statistics
- Detroit Metropolitan Wayne County (DTW) 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
- Why the first flight of the morning is statistically safest
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.