Flight number record
AS 99
Alaska Airlines · Seattle to Anchorage
- Route
- SEA → ANC
- Departs
- 15:58
- Flights
- 319
- Period
- July 2025 to June 2026
Historical statistics for July 2025 to June 2026, not live status. For today’s AS 99, check with Alaska Airlines.
AS 99 sits in the middle of the pack with a B+. Close to three flights in four arrive on time by the DOT's definition, 2 points worse than the national rate of 77.6%. The late ones land about an hour behind schedule. That rests on 319 flights, with a median arrival 4 minutes early.
Key figures
On time
75.3%
Arrivals under 15 minutes late, of 316 completed flights
Avg delay
61 min
Across delayed arrivals only, not all flights
Cancelled
0.94%
National rate is 1.81%
1 hour+ late
5.7%
National rate is 8.1%
These figures cover 319 flights between July 2025 and June 2026. The median arrival is 4 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 99 flies
AS 99 flies SEA to ANC without a single fixed slot. Its most common scheduled departure was 15:58, used on 68 of 319 flights, with 15:59 (47 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.
- Departs 15:5868 flights21.3%
- Departs 15:5947 flights14.7%
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 15:58 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 72.4%, and AS 99 runs 3 points better at 75.3%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
Against the route
AS 99 next to SEA to ANC
Every carrier on SEA to ANC combined arrived on time 75.2% of the time across 6,681 flights, so AS 99 is about level with it. Alaska flew 4,928 flights on the same city pair under all its flight numbers, including this one, and those ran 74.8% on time. Across its whole network Alaska Airlines managed 79.1%, which this flight trails by 4 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| AS 99thin sample | 319 | 75.3% | 61 min | 0.94% | B+ |
| All Alaska Airlines on SEA–ANC | 4,928 | 74.8% | 47 min | 1.12% | C |
| All carriers on SEA–ANC | 6,681 | 75.2% | 51 min | 1.00% | B |
| Alaska Airlines, whole network | 293,372 | 79.1% | 52 min | 1.28% | B |
Across the year
AS 99 quarter by quarter
AS 99 did not run the same all year. Its best quarter was Apr–Jun 2026 at 80.8% on time and its weakest Jul–Sep 2025 at 69.6%, a swing of 11 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 flights69.6%
- Oct–Dec 202574 flights73.2%
- Jan–Mar 202675 flights78.7%
- Apr–Jun 202678 flights80.8%
Scale runs 60% to 85%. Rows with fewer than 30 flights show a dash.
By weekday, AS 99 did best on Tuesday at 84.0% on time and worst on Sunday at 66.0%. Each day rests on about 46 flights, so a gap of 18 points is worth noticing but could still narrow in another year.
Delay causes
Why AS 99 runs late
One category carries most of the weight here. Late-arriving aircraft accounts for 45% of the 4,740 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.
- 45%Late-arriving aircraft
- 38%Carrier
- 14%National Airspace System
- 3%Extreme weather
45% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 4,740 reported delay minutes here, that single category outweighs weather by 14 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 4,740 delay minutes reported on AS 99.
Cancellations sit at 0.94% against a national 1.81%, which is ordinary. Diversions add another 0.00%.
Connections and routes
What a delay on this flight costs
5.7% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last about an hour, which a normal layover absorbs.
The 1,448 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 319 flights under AS 99 in the data flew SEA to ANC. 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. 319 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 99
For a booking, read AS 99 as 75.3% on time with 0.94% cancelled over 319 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- SEA to ANC, every carrier and departure
- ANC to SEA, the return direction
- Delta Air Lines 922 on the same route80.1%
- Delta Air Lines 928 on the same route75.7%
- Delta Air Lines 936 on the same route72.4%
- Alaska Airlines 83 on the same route68.9%
- Alaska Airlines 189 on the same route76.1%
- 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
- Why the first flight of the morning is statistically safest
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.