Flight number record

AS 313

Alaska Airlines · Seattle to Detroit

Route: SEA → DTW
Departs: 08:30
Flights: 362
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 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 7 points better than the national rate of 77.6%. When something does go wrong the average delay runs roughly 40 minutes. That rests on 362 flights, with a median arrival 7 minutes early.

Set against the rest of the country, AS 313's record is 7 points better than the US average of 77.6%. That gap is worth roughly 74 fewer late arrivals for every thousand flights.

On time

85.0%

Arrivals under 15 minutes late, of 359 completed flights

Avg delay

42 min

Across delayed arrivals only, not all flights

Cancelled

0.28%

National rate is 1.81%

1 hour+ late

3.6%

National rate is 8.1%

These figures cover 362 flights between July 2025 and June 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.

Schedule

When AS 313 flies

AS 313 flies SEA to DTW without a single fixed slot. Its most common scheduled departure was 08:30, used on 112 of 362 flights, with 08:40 (47 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 08:30112 flights30.9%
Departs 08:4047 flights13.0%

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 08:30 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 84.1%, and AS 313 runs level with that at 85.0%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.

Against the route

AS 313 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 AS 313 is about level with it. Across its whole network Alaska Airlines managed 79.1%, which this flight beats by 6 points.

AS 313 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
AS 313thin sample	362	85.0%	42 min	0.28%	A+
All Alaska Airlines on SEA–DTW	540	83.1%	46 min	0.19%	B+
All carriers on SEA–DTW	2,072	84.7%	59 min	0.82%	B+
Alaska Airlines, whole network	293,372	79.1%	52 min	1.28%	B

Across the year

AS 313 quarter by quarter

AS 313 did not run the same all year. Its best quarter was Apr–Jun 2026 at 91.2% on time and its weakest Jul–Sep 2025 at 81.1%, a swing of 10 points on roughly 91 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 flights81.1%
Oct–Dec 202589 flights82.0%
Jan–Mar 202690 flights85.4%
Apr–Jun 202691 flights91.2%

Scale runs 75% to 95%. Rows with fewer than 30 flights show a dash.

By weekday, AS 313 ranged from 80.8% on Friday to 90.2% on Thursday. With about 52 flights behind each day, a spread of 9 points is inside normal variation, so the day you fly is not worth changing for this flight.

Delay causes

Why AS 313 runs late

One category carries most of the weight here. Carrier accounts for 52% of the 2,283 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
52%
Late-arriving aircraft
24%
National Airspace System
23%
Extreme weather
0%

The largest share of delay minutes, 52%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 1,193 of the 2,283 delay minutes reported here. The split is drawn from 2,283 delay minutes reported on AS 313.

Cancellations are rare at 0.28%, below the national 1.81% 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 3.6% 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.

AS 313 is not only a SEA to DTW flight. It also flew DTW to SEA (324 flights, 72.0% 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.

Other routes flown as AS 313
Also flown as	Flights	On time	Avg delay	Cancelled	Grade
DTW to SEAthin sample	324	72.0%	45 min	0.31%	C+

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: 85.0% on time and 0.28% cancelled. That is a base rate, not a promise about any single day.

Where to go next

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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.

Key figures