Flight number record
AS 479
Alaska Airlines · Las Vegas to Seattle
- Route
- LAS → SEA
- Departs
- 07:00
- Flights
- 305
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s AS 479, check with Alaska Airlines.
AS 479 earns a B. 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 77.3%. When something does go wrong the average delay runs a little over an hour. That rests on 305 flights, with a median arrival 8 minutes early.
Set against the rest of the country, AS 479's record is 7 points better than the US average of 77.3%. That gap is worth roughly 71 fewer late arrivals for every thousand flights.
Key figures
On time
84.4%
Arrivals under 15 minutes late, of 301 completed flights
Avg delay
72 min
Across delayed arrivals only, not all flights
Cancelled
1.31%
National rate is 1.89%
1 hour+ late
2.7%
National rate is 8.3%
These figures cover 305 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 479 flies
AS 479 flies LAS to SEA without a single fixed slot. Its most common scheduled departure was 07:00, used on 123 of 305 flights, with 08:00 (78 flights) and 07:45 (44 flights) next.
- Departs 07:00123 flights40.3%
- Departs 08:0078 flights25.6%
- Departs 07:4544 flights14.4%
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 07:00 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and AS 479 runs 5 points worse at 84.4%. 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 479 next to LAS to SEA
Every carrier on LAS to SEA combined arrived on time 82.1% of the time across 5,617 flights, so AS 479 is 2 points ahead of it. Alaska flew 2,610 flights on the same city pair under all its flight numbers, including this one, and those ran 83.2% on time. Across its whole network Alaska Airlines managed 79.7%, which this flight beats by 5 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| AS 479thin sample | 305 | 84.4% | 72 min | 1.31% | B |
| All Alaska Airlines on LAS–SEA | 2,610 | 83.2% | 66 min | 1.19% | B |
| All carriers on LAS–SEA | 5,617 | 82.1% | 64 min | 1.00% | B |
| Alaska Airlines, whole network | 309,844 | 79.7% | 52 min | 1.20% | B |
Across the year
AS 479 quarter by quarter
Quarter by quarter AS 479 held fairly steady: 80.3% in Oct–Dec 2025, 88.9% in Jan–Mar 2026, 87.9% in Apr–Jun 2026 and 79.2% in Jul–Sep 2026. A spread of 10 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Jul–Sep 202530 flights—
- Oct–Dec 202562 flights80.3%
- Jan–Mar 202673 flights88.9%
- Apr–Jun 202691 flights87.9%
- Jul–Sep 202649 flights79.2%
Scale runs 70% to 95%. Rows with fewer than 30 flights show a dash.
By weekday, AS 479 did best on Wednesday at 91.9% on time and worst on Thursday at 78.3%. Each day rests on about 44 flights, so a gap of 14 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late AS 479 runs when it is late
AS 479 often beats the schedule: 93 of 301 completed flights, 31%, arrived 15 minutes or more early. The 47 late arrivals split 21 under half an hour, 18 between 30 and 60 minutes, and 8 an hour or more.
- 15+ min early93 flights30.9%
- Within 15 min161 flights53.5%
- 15–29 min late21 flights7.0%
- 30–59 min late18 flights6.0%
- 1–2 hours late4 flights1.3%
- 2+ hours late4 flights1.3%
Scale runs 0% to 100%.
Share of 301 completed flights by arrival against schedule.
13 of 44 late departures made up the time and arrived on time, 30% of them. In the other direction, 16 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at SEA.
The worst days
Worst days for AS 479
The latest arrival of the period was on 18 June 2026, 13 hours 51 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on four of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 18 June 2026 | 13 hours 51 minutes | Carrier |
| 5 June 2026 | 8 hours 18 minutes | Carrier |
| 18 September 2025 | 5 hours 21 minutes | Carrier |
| 25 October 2025 | 2 hours 21 minutes | Carrier |
| 5 December 2025 | 1 hour 53 minutes | National Airspace System |
Delay causes
Why AS 479 runs late
Carrier accounts for 70% of the 3,375 delay minutes carriers reported here, and the remaining four split what is left.
- 70%Carrier
- 26%National Airspace System
- 4%Late-arriving aircraft
- 1%Extreme weather
The largest share of delay minutes, 70%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 2,349 of the 3,375 delay minutes reported here. The split is drawn from 3,375 delay minutes reported on AS 479.
Cancellations sit at 1.31% 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 2.7% 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.
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.
The same number turns up on one other city pair in the data, including PDX to OGG (13), but none flew often enough under AS 479 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to LAS to SEA only.
One caution: this is a thin sample. 305 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 84.4% on time with 1.31% cancelled over 305 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- LAS to SEA, every carrier and departure
- SEA to LAS, the return direction
- Delta Air Lines 2844 on the same route94.7%
- Alaska Airlines 676 on the same route77.1%
- Alaska Airlines 629 on the same route88.3%
- Delta Air Lines 2880 on the same route84.5%
- Alaska Airlines 552 on the same route81.5%
- Alaska Airlines 701 on the same route95.5%
- Harry Reid International (LAS) delay statistics
- Seattle-Tacoma International (SEA) 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.