Flight number record

AS 479

Alaska Airlines · Las Vegas to Seattle

Route: LAS → SEA
Departs: 08:00
Flights: 318
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s AS 479, check with Alaska Airlines.

AS 479 lands a B, 4 points better than the national rate of 77.6%. Roughly one flight in five arrives 15 minutes late or worse, and those flights are late by a little over an hour on average. That is a workable record, not a spotless one. That rests on 318 flights, with a median arrival 6 minutes early.

Set against the rest of the country, AS 479's record is 4 points better than the US average of 77.6%. That gap is worth roughly 41 fewer late arrivals for every thousand flights.

On time

81.7%

Arrivals under 15 minutes late, of 311 completed flights

Avg delay

70 min

Across delayed arrivals only, not all flights

Cancelled

1.89%

National rate is 1.81%

1 hour+ late

3.5%

National rate is 8.1%

These figures cover 318 flights between July 2025 and June 2026. The median arrival is 6 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 479 flies

AS 479 flies LAS to SEA without a single fixed slot. Its most common scheduled departure was 08:00, used on 128 of 318 flights, with 07:00 (116 flights) and 07:45 (44 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 08:00128 flights40.3%
Departs 07:00116 flights36.5%
Departs 07:4544 flights13.8%

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 08:00 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 84.1%, and AS 479 runs 2 points worse at 81.7%. 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 479 next to LAS to SEA

Every carrier on LAS to SEA combined arrived on time 82.3% of the time across 5,649 flights, so AS 479 is about level with it. Alaska flew 2,638 flights on the same city pair under all its flight numbers, including this one, and those ran 82.8% on time. Across its whole network Alaska Airlines managed 79.1%, which this flight beats by 3 points.

AS 479 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
AS 479thin sample	318	81.7%	70 min	1.89%	B
All Alaska Airlines on LAS–SEA	2,638	82.8%	64 min	1.25%	B
All carriers on LAS–SEA	5,649	82.3%	63 min	0.94%	B+
Alaska Airlines, whole network	293,372	79.1%	52 min	1.28%	B

Across the year

AS 479 quarter by quarter

AS 479 did not run the same all year. Its best quarter was Jan–Mar 2026 at 88.9% on time and its weakest Jul–Sep 2025 at 70.1%, a swing of 19 points on roughly 80 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 flights70.1%
Oct–Dec 202562 flights80.3%
Jan–Mar 202673 flights88.9%
Apr–Jun 202691 flights87.9%

Scale runs 60% to 95%. Rows with fewer than 30 flights show a dash.

By weekday, AS 479 did best on Monday at 89.1% on time and worst on Thursday at 75.0%. Each day rests on about 45 flights, so a gap of 14 points is worth noticing but could still narrow in another year.

Delay causes

Why AS 479 runs late

One category carries most of the weight here. Carrier accounts for 66% of the 4,015 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
66%
National Airspace System
30%
Late-arriving aircraft
4%

The largest share of delay minutes, 66%, 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 2,660 of the 4,015 delay minutes reported here. The split is drawn from 4,015 delay minutes reported on AS 479.

Cancellations sit at 1.89% against a national 1.81%, which is ordinary. Diversions add another 0.31%.

Connections and routes

What a delay on this flight costs

Badly late arrivals are rare here: only 3.5% 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.

The 867 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.

Every one of the 318 flights under AS 479 in the data flew LAS to SEA. 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. 318 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 AS 479

For a booking, read AS 479 as 81.7% on time with 1.89% cancelled over 318 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