Flight number record

AS 508

Alaska Airlines · Seattle to Cincinnati

Route: SEA → CVG
Departs: 10:12
Flights: 361
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s AS 508, check with Alaska Airlines.

AS 508 lands a B, 2 points better than the national rate of 77.6%. About one flight in five arrives 15 minutes late or worse, and those flights are late by roughly 45 minutes on average. That is a workable record, not a spotless one. That rests on 361 flights, with a median arrival 8 minutes early.

On time

79.7%

Arrivals under 15 minutes late, of 355 completed flights

Avg delay

44 min

Across delayed arrivals only, not all flights

Cancelled

1.11%

National rate is 1.81%

1 hour+ late

3.9%

National rate is 8.1%

These figures cover 361 flights between July 2025 and June 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.

Schedule

When AS 508 flies

AS 508 flies SEA to CVG without a single fixed slot. Its most common scheduled departure was 10:12, used on 50 of 361 flights, with 10:14 (41 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 10:1250 flights13.9%
Departs 10:1441 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 10:12 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 84.1%, and AS 508 runs 4 points worse at 79.7%. 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 508 next to SEA to CVG

Every carrier on SEA to CVG combined arrived on time 81.7% of the time across 793 flights, so AS 508 is 2 points behind it. Across its whole network Alaska Airlines managed 79.1%, close to this flight's figure.

AS 508 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
AS 508thin sample	361	79.7%	44 min	1.11%	B
All Alaska Airlines on SEA–CVG	431	77.2%	46 min	0.93%	B+
All carriers on SEA–CVG	793	81.7%	51 min	0.88%	B+
Alaska Airlines, whole network	293,372	79.1%	52 min	1.28%	B

Across the year

AS 508 quarter by quarter

Quarter by quarter AS 508 held fairly steady: 74.4% in Jul–Sep 2025, 79.5% in Oct–Dec 2025, 82.6% in Jan–Mar 2026 and 82.4% in Apr–Jun 2026. A spread of 8 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202592 flights74.4%
Oct–Dec 202589 flights79.5%
Jan–Mar 202689 flights82.6%
Apr–Jun 202691 flights82.4%

Scale runs 65% to 90%. Rows with fewer than 30 flights show a dash.

By weekday, AS 508 did best on Wednesday at 88.5% on time and worst on Sunday at 66.0%. Each day rests on about 52 flights, so a gap of 23 points is worth noticing but could still narrow in another year.

Delay causes

Why AS 508 runs late

One category carries most of the weight here. Carrier accounts for 49% of the 3,155 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
49%
Late-arriving aircraft
26%
National Airspace System
25%

The largest share of delay minutes, 49%, 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 1,543 of the 3,155 delay minutes reported here. The split is drawn from 3,155 delay minutes reported on AS 508.

Cancellations sit at 1.11% against a national 1.81%, which is ordinary. Diversions add another 0.55%.

Connections and routes

What a delay on this flight costs

Badly late arrivals are rare here: only 3.9% 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 1,965 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 508 is not only a SEA to CVG flight. It also flew CVG to SEA (291 flights, 68.1% 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. 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.

Other routes flown as AS 508
Also flown as	Flights	On time	Avg delay	Cancelled	Grade
CVG to SEAthin sample	291	68.1%	52 min	1.03%	C

What to do with this

Booking AS 508

For a booking, read AS 508 as 79.7% on time with 1.11% cancelled over 361 flights. Those are rates from the past twelve months, not a forecast for any particular 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