Flight number record
AS 313
Alaska Airlines · Seattle to Detroit
- Route
- SEA → DTW
- Departs
- 09:18
- Flights
- 362
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s AS 313, check with Alaska Airlines.
AS 313 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 77.3%. When something does go wrong the average delay runs roughly 45 minutes. That rests on 362 flights, with a median arrival 8 minutes early.
Set against the rest of the country, AS 313's record is 8 points better than the US average of 77.3%. That gap is worth roughly 80 fewer late arrivals for every thousand flights.
Key figures
On time
85.3%
Arrivals under 15 minutes late, of 361 completed flights
Avg delay
47 min
Across delayed arrivals only, not all flights
Cancelled
0.28%
National rate is 1.89%
1 hour+ late
4.7%
National rate is 8.3%
These figures cover 362 flights between September 2025 and August 2026. The median arrival is 8 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 AS 313 flies
AS 313 flies SEA to DTW without a single fixed slot. Its most common scheduled departure was 09:18, used on 70 of 362 flights, with 08:30 (52 flights) and 08:40 (47 flights) next.
- Departs 09:1870 flights19.3%
- Departs 08:3052 flights14.4%
- Departs 08:4047 flights13.0%
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 09:18 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and AS 313 runs level with that at 85.3%. 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
AS 313 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 AS 313 is about level with it. Alaska flew 548 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 Alaska Airlines managed 79.7%, which this flight beats by 6 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| AS 313thin sample | 362 | 85.3% | 47 min | 0.28% | A+ |
| All Alaska Airlines on SEA–DTW | 548 | 85.3% | 51 min | 0.18% | A+ |
| All carriers on SEA–DTW | 2,063 | 86.6% | 65 min | 0.68% | A+ |
| Alaska Airlines, whole network | 309,844 | 79.7% | 52 min | 1.20% | B |
Across the year
AS 313 quarter by quarter
Quarter by quarter AS 313 held fairly steady: 83.3% in Jul–Sep 2025, 82.0% in Oct–Dec 2025, 85.4% in Jan–Mar 2026, 91.2% in Apr–Jun 2026 and 82.3% 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 202589 flights82.0%
- Jan–Mar 202690 flights85.4%
- Apr–Jun 202691 flights91.2%
- Jul–Sep 202662 flights82.3%
Scale runs 75% to 95%.
By weekday, AS 313 ranged from 80.8% on Friday to 90.4% on Wednesday. With about 52 flights behind each day, a spread of 10 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late AS 313 runs when it is late
AS 313 often beats the schedule: 124 of 361 completed flights, 34%, arrived 15 minutes or more early. The 53 late arrivals split 22 under half an hour, 14 between 30 and 60 minutes, and 17 an hour or more.
- 15+ min early124 flights34.3%
- Within 15 min184 flights51.0%
- 15–29 min late22 flights6.1%
- 30–59 min late14 flights3.9%
- 1–2 hours late16 flights4.4%
- 2+ hours late1 flights0.3%
Scale runs 0% to 100%.
Share of 361 completed flights by arrival against schedule.
A late pushback is often recovered here: of 60 departures that left 15 minutes late or more, 21 still arrived on time. 14 flights left on time and still arrived late.
The worst days
Worst days for AS 313
The latest arrival of the period was on 27 January 2026, 2 hours 42 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on five of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 27 January 2026 | 2 hours 42 minutes | Carrier |
| 9 July 2026 | 1 hour 43 minutes | Carrier |
| 30 November 2025 | 1 hour 40 minutes | Carrier |
| 12 October 2025 | 1 hour 37 minutes | Carrier |
| 27 April 2026 | 1 hour 31 minutes | Carrier |
Delay causes
Why AS 313 runs late
Carrier accounts for 53% of the 2,490 delay minutes carriers reported here, and the remaining four split what is left.
- 53%Carrier
- 23%National Airspace System
- 22%Late-arriving aircraft
- 2%Extreme weather
The largest share of delay minutes, 53%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 1,329 of the 2,490 delay minutes reported here. The split is drawn from 2,490 delay minutes reported on AS 313.
Cancellations are rare at 0.28%, 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 4.7% 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.
AS 313 is not only a SEA to DTW flight. It also flew DTW to SEA (332 flights, 75.1% on time) often enough to be scored on its own. Airlines attach one number to several legs of an aircraft's day, and each leg keeps its own record here, so check which city pair is on your booking before reading a rate.
One caution: this is a thin sample. 362 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.
| Also flown as | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DTW to SEAthin sample | 332 | 75.1% | 45 min | 0.60% | B+ |
What to do with this
Booking AS 313
For a booking, AS 313 has one of the better records a US domestic flight can show: 85.3% on time and 0.28% 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%
- Delta Air Lines 810 on the same route89.6%
- 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
- Alaska Airlines on-time record
- Every Alaska Airlines flight number with a record
- The most and least reliable flight numbers in the US
- Worst months to fly in the US, ranked by the data
A flight number here means Alaska Airlines’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.