Flight number record
AS 502
Alaska Airlines · Seattle to Austin
- Route
- SEA → AUS
- Departs
- 09:49
- Flights
- 295
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s AS 502, check with Alaska Airlines.
AS 502 lands a B, 6 points better than the national rate of 77.3%. About one flight in six arrives 15 minutes late or worse, and those flights are late by about 40 minutes on average. That rests on 295 flights, with a median arrival 5 minutes early.
Set against the rest of the country, AS 502's record is 6 points better than the US average of 77.3%. That gap is worth roughly 58 fewer late arrivals for every thousand flights.
Key figures
On time
83.1%
Arrivals under 15 minutes late, of 290 completed flights
Avg delay
39 min
Across delayed arrivals only, not all flights
Cancelled
1.69%
National rate is 1.89%
1 hour+ late
2.4%
National rate is 8.3%
These figures cover 295 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 502 flies
AS 502 flies SEA to AUS without a single fixed slot. Its most common scheduled departure was 09:49, used on 36 of 295 flights, with 08:20 (35 flights) and 08:25 (34 flights) next.
- Departs 09:4936 flights12.2%
- Departs 08:2035 flights11.9%
- Departs 08:2534 flights11.5%
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 09:49 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and AS 502 runs level with that at 83.1%. 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 502 next to SEA to AUS
Every carrier on SEA to AUS combined arrived on time 78.5% of the time across 2,090 flights, so AS 502 is 5 points ahead of it. Alaska flew 1,051 flights on the same city pair under all its flight numbers, including this one, and those ran 80.1% on time. Across its whole network Alaska Airlines managed 79.7%, which this flight beats by 3 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| AS 502thin sample | 295 | 83.1% | 39 min | 1.69% | B |
| All Alaska Airlines on SEA–AUS | 1,051 | 80.1% | 44 min | 0.67% | B+ |
| All carriers on SEA–AUS | 2,090 | 78.5% | 55 min | 0.81% | B+ |
| Alaska Airlines, whole network | 309,844 | 79.7% | 52 min | 1.20% | B |
Across the year
AS 502 quarter by quarter
AS 502 did not run the same all year. Its best quarter was Apr–Jun 2026 at 94.3% on time and its weakest Oct–Dec 2025 at 73.3%, a swing of 21 points on roughly 74 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 flights86.7%
- Oct–Dec 202592 flights73.3%
- Jan–Mar 202690 flights87.4%
- Apr–Jun 202670 flights94.3%
- Jul–Sep 202613 flights—
Scale runs 65% to 100%. Rows with fewer than 30 flights show a dash.
By weekday, AS 502 did best on Thursday at 95.2% on time and worst on Friday at 72.5%. Each day rests on about 42 flights, so a gap of 23 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late AS 502 runs when it is late
Most of the lateness is short. 25 of the 49 late arrivals were under half an hour behind, and 7 reached an hour or more.
- 15+ min early49 flights16.9%
- Within 15 min192 flights66.2%
- 15–29 min late25 flights8.6%
- 30–59 min late17 flights5.9%
- 1–2 hours late6 flights2.1%
- 2+ hours late1 flights0.3%
Scale runs 0% to 100%.
Share of 290 completed flights by arrival against schedule.
A late pushback is often recovered here: of 56 departures that left 15 minutes late or more, 25 still arrived on time. In the other direction, 18 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 AUS.
The worst days
Worst days for AS 502
The latest arrival of the period was on 23 December 2025, 2 hours 43 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The five worst days are spread across December, November, August and October, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 23 December 2025 | 2 hours 43 minutes | Carrier |
| 9 November 2025 | 1 hour 57 minutes | National Airspace System |
| 24 August 2026 | 1 hour 26 minutes | Late-arriving aircraft |
| 26 December 2025 | 1 hour 16 minutes | Late-arriving aircraft |
| 20 October 2025 | 1 hour 12 minutes | National Airspace System |
Delay causes
Why AS 502 runs late
National Airspace System accounts for 42% of the 1,916 delay minutes carriers reported here, and the remaining four split what is left.
- 42%National Airspace System
- 37%Carrier
- 16%Late-arriving aircraft
- 5%Extreme weather
The largest share of delay minutes, 37%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 704 of the 1,916 delay minutes reported here. The split is drawn from 1,916 delay minutes reported on AS 502.
Cancellations sit at 1.69% 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 2.4% 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.
At 1,770 miles this is transcontinental flying, and long routes get a quiet structural advantage. Scheduled block time on a flight this length carries more padding in absolute minutes, so a twenty-minute late departure often still becomes an on-time arrival. Read the on-time rate here as slightly flattering next to a short-haul route with the same operational quality.
The same number turns up on two other city pairs in the data, including SEA to LAX (70) and AUS to SEA (28), but none flew often enough under AS 502 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to SEA to AUS only.
One caution: this is a thin sample. 295 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 502
For a booking, read AS 502 as 83.1% on time with 1.69% cancelled over 295 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- SEA to AUS, every carrier and departure
- AUS to SEA, the return direction
- Delta Air Lines 831 on the same route78.7%
- Delta Air Lines 848 on the same route73.5%
- Alaska Airlines 352 on the same route84.3%
- Delta Air Lines 739 on the same route89.2%
- Alaska Airlines 372 on the same route77.6%
- Seattle-Tacoma International (SEA) delay statistics
- Austin-Bergstrom International (AUS) 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.