Flight number record
AS 566
Alaska Airlines · San Diego to Spokane
- Route
- SAN → GEG
- Departs
- 20:59
- Flights
- 289
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s AS 566, check with Alaska Airlines.
AS 566 lands a B+, 4 points better than the national rate of 77.3%. About one flight in five arrives 15 minutes late or worse, and those flights are late by roughly 40 minutes on average. That rests on 289 flights, with a median arrival 11 minutes early.
Key figures
On time
80.8%
Arrivals under 15 minutes late, of 286 completed flights
Avg delay
42 min
Across delayed arrivals only, not all flights
Cancelled
0.69%
National rate is 1.89%
1 hour+ late
4.5%
National rate is 8.3%
These figures cover 289 flights between September 2025 and August 2026. The median arrival is 11 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 566 flies
AS 566 flies SAN to GEG without a single fixed slot. Its most common scheduled departure was 20:59, used on 71 of 289 flights, with 20:22 (70 flights) and 21:00 (29 flights) next.
- Departs 20:5971 flights24.6%
- Departs 20:2270 flights24.2%
- Departs 21:0029 flights10.0%
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 20:59 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.1%, and AS 566 runs 11 points better at 80.8%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
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Against the route
AS 566 next to SAN to GEG
Every carrier on SAN to GEG combined arrived on time 81.0% of the time across 442 flights, so AS 566 is about level with it. Across its whole network Alaska Airlines managed 79.7%, close to this flight's figure.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| AS 566thin sample | 289 | 80.8% | 42 min | 0.69% | B+ |
| All Alaska Airlines on SAN–GEGthin sample | 364 | 83.3% | 43 min | 1.10% | B |
| All carriers on SAN–GEG | 442 | 81.0% | 44 min | 0.90% | B+ |
| Alaska Airlines, whole network | 309,844 | 79.7% | 52 min | 1.20% | B |
Across the year
AS 566 quarter by quarter
Quarter by quarter AS 566 held fairly steady: 76.9% in Oct–Dec 2025, 82.9% in Jan–Mar 2026, 83.5% in Apr–Jun 2026 and 78.3% in Jul–Sep 2026. A spread of 7 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Oct–Dec 202566 flights76.9%
- Jan–Mar 202676 flights82.9%
- Apr–Jun 202685 flights83.5%
- Jul–Sep 202662 flights78.3%
Scale runs 70% to 90%.
By weekday, AS 566 did best on Saturday at 89.5% on time and worst on Sunday at 64.4%. Each day rests on about 41 flights, so a gap of 25 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late AS 566 runs when it is late
AS 566 often beats the schedule: 121 of 286 completed flights, 42%, arrived 15 minutes or more early. The 55 late arrivals split 27 under half an hour, 15 between 30 and 60 minutes, and 13 an hour or more.
- 15+ min early121 flights42.3%
- Within 15 min110 flights38.5%
- 15–29 min late27 flights9.4%
- 30–59 min late15 flights5.2%
- 1–2 hours late11 flights3.8%
- 2+ hours late2 flights0.7%
Scale runs 0% to 100%.
Share of 286 completed flights by arrival against schedule.
20 of 68 late departures made up the time and arrived on time, 29% of them. 7 flights left on time and still arrived late.
The worst days
Worst days for AS 566
The latest arrival of the period was on 15 March 2026, 2 hours 14 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). On three of the five worst days the largest share was filed as a late-arriving aircraft.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 15 March 2026 | 2 hours 14 minutes | Carrier |
| 20 November 2025 | 2 hours 13 minutes | Late-arriving aircraft |
| 19 December 2025 | 1 hour 53 minutes | Late-arriving aircraft |
| 30 December 2025 | 1 hour 50 minutes | Carrier |
| 29 March 2026 | 1 hour 31 minutes | Late-arriving aircraft |
Delay causes
Why AS 566 runs late
Late-arriving aircraft accounts for 60% of the 2,314 delay minutes carriers reported here, and the remaining four split what is left.
- 60%Late-arriving aircraft
- 31%Carrier
- 9%National Airspace System
- 1%Extreme weather
- 1%Security
60% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 2,314 reported delay minutes here, that single category outweighs weather by 60 to one. The split is drawn from 2,314 delay minutes reported on AS 566.
Cancellations are rare at 0.69%, below the national 1.89% and low enough to earn the plus on the grade. Roughly one flight in 100 is called off; the risk here is arriving late, not not arriving.
Connections and routes
What a delay on this flight costs
Badly late arrivals are rare here: only 4.5% 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 1,027 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 FAT to SEA (1), but none flew often enough under AS 566 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to SAN to GEG only.
One caution: this is a thin sample. 289 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 566
For a booking, read AS 566 as 80.8% on time with 0.69% cancelled over 289 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- San Diego International (SAN) 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.