Flight profile · Alaska Airlines
AS99
Seattle (SEA) to Anchorage (ANC) · scheduled 3:58 PM – 6:42 PM
How AS99 performs
628 operations, July 2023 – July 2026.
Source: US DOT Bureau of Transportation Statistics · 628 operations, July 2023 – July 2026 · If AS99 is cancelled or significantly changed, DOT’s automatic refund rule may entitle you to your money back. The refund checker walks through eligibility.
Where AS99 is right now
A live reading, only if you ask for it. It is not part of the reliability record above.
Ask for the position of AS99 right now, if receivers on the ground are hearing it. Nothing is requested until you press the button.
Against the rest of the route
| Flight or route | On time | Cancelled | Median delay | Severe | Flights |
|---|---|---|---|---|---|
| AS99 | 76.3% | 0.64% | -4 min | 4.5% | 628 |
| Alaska Airlines on SEA → ANC | 74.1% | 0.88% | 0 min | 4.5% | 17,131 |
| All SEA → ANC flights | 75.8% | 0.74% | -2 min | 4.5% | 22,363 |
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – July 2026
Why AS99 runs late
Where US DOT attributed the delay minutes on this flight.
the inbound aircraft was late, so this flight started late
crew, maintenance, boarding and fueling, all within the carrier’s control
airspace and airport capacity, including weather-driven flow control
weather severe enough to stop this flight specifically
Share of the delay minutes US DOT attributed to each cause for AS99 on SEA → ANC. Only delays of 15 minutes or more are attributed.
Source: US DOT Bureau of Transportation Statistics · Data covering July 2023 – July 2026
Does a late aircraft delay this flight?
How often the plane that flies AS99 comes in late, and what that does to the departure.
The aircraft flying AS99 came in 15 or more minutes late on 16% of the departures where its previous flight is known. There are not enough departures in both groups to say how the flight left after a late one and after an on-time one.
Each departure is matched to the flight the same aircraft flew into SEA just before it, using the tail number in the DOT file, 580 of 624 departures in all. A departure is left out when that flight is unknown, was cancelled or diverted, or the aircraft had sat for more than 12 hours. A flight the airline cancelled never left and is not in the count, and one flown by a substitute aircraft is matched to the aircraft that flew it, not to the one first planned.
Against the network at the same turn length
| Share of departures | Inbound landed 15+ late |
|---|---|
| AS99 | 16% |
| Network, same turn | 17% |
The schedule leaves a normal turn: enough time to clean and board if the aircraft is on time, little to spare if it is not.
The network row is every flight with a scheduled turn of 60 to 89 minutes. How often AS99’s aircraft landed 15 or more minutes late is about the same as the network’s. There are not enough departures in both groups to compare how it left.
More: Which Flight Numbers Pay for a Late Aircraft lists the flight numbers that pass a late aircraft on.
Source: US DOT Bureau of Transportation Statistics · Data covering July 2023 – July 2026
From pushback to gate
When it leaves SEA late, does that still matter by the time it reaches ANC?
AS99 pushes back an average of 12.4 minutes late and reaches the gate at ANC an average of 5.2 minutes late. The 7.3 minutes between those two figures are slack the published schedule already carries, which is why a late pushback on this flight does not reliably become a late arrival. It spends 21.0 minutes on the taxiways at SEA, 1.3 minutes longer than a typical SEA departure in the same hour.
On arrival at ANC, AS99 spends 5.2 min taxiing from touchdown to the gate — ground time a connecting passenger sits through before they can even leave the aircraft, on top of however late the flight itself ran. That is about what any arrival at ANC spends on the ground before reaching the gate.
Departure delay is averaged over every pushback and arrival delay over every completed arrival, so the two counts differ by the flights that never reached ANC. Taxi-out is gate to wheels up and sits inside the scheduled block rather than on top of it; the comparison is 34,813 departures from SEA scheduled in the clock hour AS99 most often leaves in. Taxi-in is landing to gate, compared against every arrival FlyerIntel has on file at ANC (58,786 flights), not just AS99’s own. More on taxi time.
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – July 2026
The hour it leaves SEA
Part of any flight’s record belongs to the clock rather than to the flight. AS99 has one departure time, so this is what that time is worth.
On-time arrival rate. 34,813 departures from SEA are scheduled in the 3 PM–4 PM hour over the period, against 510,205 across the whole day.
AS99 is scheduled out of SEA at 3:58 PM, in the 3 PM–4 PM bank. Departures from SEA in that hour arrive on time 78.1% of the time against 79.1% across the airport’s whole day, so the hour AS99 leaves in is an ordinary one for SEA and explains nothing about its record either way.
The two airport figures cover every departure from SEA to every destination, so they describe the slot rather than this journey — the like-for-like comparison against the route is above. Hours are scheduled local, and a number whose schedule moved between banks inside the period has no single hour and is not described here at all. Why the hour matters.
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – July 2026 · Hours below 120 departures are not scored.
Other routes AS99 has flown
A flight number is a slot in a schedule, and carriers reassign it. These are the other city pairs this number served in the analysis period.
| Route | Operated | Flights | On time |
|---|---|---|---|
| FAI→ANC Fairbanks to Anchorage | June 13, 2024 – November 21, 2024 | 148 | 88.5% |
Because the same number has served different journeys, the statistics above describe only the route AS99 currently operates. Blending them would produce an average of two different flights.
When it goes wrong
The average describes a usual day. This is the day that ruins a connection.
35 min late
against a median of 4 min early
Percentiles over 628 operations; cancelled and diverted flights are counted separately.
Source: US DOT Bureau of Transportation Statistics · Data covering July 2023 – July 2026
Other flights on this route
Same airports, same journey, different odds of arriving on time.
| Flight | Airline | On time | Median arrival | Operations |
|---|---|---|---|---|
| AS85 | Alaska Airlines | 87.3% | 8 min early | 783 |
| DL922 | Delta Air Lines | 85.6% | 7 min early | 785 |
| DL928 | Delta Air Lines | 80.4% | 7 min early | 783 |
| AS189 | Alaska Airlines | 78.2% | 2 min early | 738 |
| AS131 | Alaska Airlines | 77.5% | 3 min early | 800 |
| AS99 this flight | Alaska Airlines | 76.3% | 4 min early | 628 |
| DL936 | Delta Air Lines | 75.9% | 2 min early | 684 |
| DL931 | Delta Air Lines | 75.7% | 5 min early | 605 |
| AS83 | Alaska Airlines | 73.2% | 1 min early | 1,008 |
Every departure listed carries at least 600 operations, so the comparison is between figures that mean something. AS99 is placed in the same ordering rather than left out of it; the rows around it are the most punctual departures on the route, not all of them, so this is a comparison and not a rank. Schedules change; confirm the departure still operates before booking around this.
Data and methodology
Calculated by FlyerIntel from 628 records of AS99 operating SEA → ANC, published by the US DOT Bureau of Transportation Statistics. A flight counts as delayed when it arrives 15 or more minutes after schedule. Cancelled and diverted flights are excluded from the on-time rate and reported separately. Flight numbers are resolved as carrier plus number plus route, because the same number serves different routes over time.
Full methodology · Data sources · Report a problem
Related research: Most and Least Reliable Flight Numbers · The Delay You Inherit · Making Up Time in the Air
Analysis last recomputed