Flight number record
AS 99
Alaska Airlines · Seattle to Anchorage
- Route
- SEA → ANC
- Departs
- 15:58
- Flights
- 317
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 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 77.3%. The late ones land about an hour behind schedule. That rests on 317 flights, with a median arrival 5 minutes early.
Key figures
On time
75.2%
Arrivals under 15 minutes late, of 314 completed flights
Avg delay
60 min
Across delayed arrivals only, not all flights
Cancelled
0.95%
National rate is 1.89%
1 hour+ late
5.1%
National rate is 8.3%
These figures cover 317 flights between September 2025 and August 2026. The median arrival is 5 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 99 flies
AS 99 flies SEA to ANC without a single fixed slot. Its most common scheduled departure was 15:58, used on 60 of 317 flights, with 15:59 (38 flights) and 15:55 (36 flights) next.
- Departs 15:5860 flights18.9%
- Departs 15:5938 flights12.0%
- Departs 15:5536 flights11.4%
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 15:58 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 71.9%, and AS 99 runs 3 points better at 75.2%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
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Against the route
AS 99 next to SEA to ANC
Every carrier on SEA to ANC combined arrived on time 76.5% of the time across 6,619 flights, so AS 99 is about level with it. Alaska flew 4,999 flights on the same city pair under all its flight numbers, including this one, and those ran 76.3% on time. Across its whole network Alaska Airlines managed 79.7%, which this flight trails by 5 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| AS 99thin sample | 317 | 75.2% | 60 min | 0.95% | B+ |
| All Alaska Airlines on SEA–ANC | 4,999 | 76.3% | 47 min | 0.74% | B+ |
| All carriers on SEA–ANC | 6,619 | 76.5% | 50 min | 0.71% | B+ |
| Alaska Airlines, whole network | 309,844 | 79.7% | 52 min | 1.20% | 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 2026 at 68.3%, a swing of 13 points on roughly 63 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 202530 flights70.0%
- Oct–Dec 202574 flights73.2%
- Jan–Mar 202675 flights78.7%
- Apr–Jun 202678 flights80.8%
- Jul–Sep 202660 flights68.3%
Scale runs 60% to 85%.
By weekday, AS 99 ranged from 70.8% on Monday to 79.1% on Friday. With about 45 flights behind each day, a spread of 8 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late AS 99 runs when it is late
AS 99 often beats the schedule: 83 of 314 completed flights, 26%, arrived 15 minutes or more early. The 78 late arrivals split 37 under half an hour, 25 between 30 and 60 minutes, and 16 an hour or more.
- 15+ min early83 flights26.4%
- Within 15 min153 flights48.7%
- 15–29 min late37 flights11.8%
- 30–59 min late25 flights8.0%
- 1–2 hours late6 flights1.9%
- 2+ hours late10 flights3.2%
Scale runs 0% to 100%.
Share of 314 completed flights by arrival against schedule.
16 of 83 late departures made up the time and arrived on time, 19% of them. 11 flights left on time and still arrived late.
The worst days
Worst days for AS 99
The latest arrival of the period was on 13 March 2026, 7 hours 14 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 13 March 2026 | 7 hours 14 minutes | Late-arriving aircraft |
| 8 January 2026 | 6 hours 52 minutes | Late-arriving aircraft |
| 23 October 2025 | 5 hours 53 minutes | Carrier |
| 23 June 2026 | 4 hours 3 minutes | Late-arriving aircraft |
| 4 January 2026 | 3 hours 15 minutes | Carrier |
Delay causes
Why AS 99 runs late
Late-arriving aircraft accounts for 45% of the 4,643 delay minutes carriers reported here, and the remaining four split what is left.
- 45%Late-arriving aircraft
- 39%Carrier
- 12%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. Across 4,643 reported delay minutes here, that single category outweighs weather by 14 to one. The split is drawn from 4,643 delay minutes reported on AS 99.
Cancellations sit at 0.95% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and routes
What a delay on this flight costs
5.1% of arrivals land an hour or more late, close to the national 8.3%, so 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.
Every one of the 317 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. 317 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 75.2% on time with 0.95% cancelled over 317 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 route78.9%
- Delta Air Lines 928 on the same route72.6%
- Delta Air Lines 936 on the same route73.0%
- Alaska Airlines 83 on the same route70.4%
- 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, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.