Flight number record
AS 399
Alaska Airlines · San Diego to Portland
- Route
- SAN → PDX
- Departs
- 07:00
- Flights
- 267
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s AS 399, check with Alaska Airlines.
AS 399 earns an A. Close to nine flights in ten arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 16 points better than the national rate of 77.3%. When something does go wrong the average delay runs about 50 minutes. That rests on 267 flights, with a median arrival 13 minutes early.
Set against the rest of the country, AS 399's record is 16 points better than the US average of 77.3%. That gap is worth roughly 155 fewer late arrivals for every thousand flights.
Key figures
On time
92.8%
Arrivals under 15 minutes late, of 264 completed flights
Avg delay
49 min
Across delayed arrivals only, not all flights
Cancelled
1.12%
National rate is 1.89%
1 hour+ late
1.9%
National rate is 8.3%
These figures cover 267 flights between September 2025 and August 2026. The median arrival is 13 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 399 flies
AS 399 flies SAN to PDX without a single fixed slot. Its most common scheduled departure was 07:00, used on 152 of 267 flights, with 06:50 (86 flights) and 06:55 (29 flights) next.
- Departs 07:00152 flights56.9%
- Departs 06:5086 flights32.2%
- Departs 06:5529 flights10.9%
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 07:00 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and AS 399 runs 4 points better at 92.8%. 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 399 next to SAN to PDX
Every carrier on SAN to PDX combined arrived on time 82.5% of the time across 1,838 flights, so AS 399 is 10 points ahead of it. Alaska flew 1,591 flights on the same city pair under all its flight numbers, including this one, and those ran 85.5% on time. Across its whole network Alaska Airlines managed 79.7%, which this flight beats by 13 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| AS 399thin sample | 267 | 92.8% | 49 min | 1.12% | A |
| All Alaska Airlines on SAN–PDX | 1,591 | 85.5% | 55 min | 1.01% | A |
| All carriers on SAN–PDX | 1,838 | 82.5% | 51 min | 0.87% | B+ |
| Alaska Airlines, whole network | 309,844 | 79.7% | 52 min | 1.20% | B |
Across the year
AS 399 quarter by quarter
Quarter by quarter AS 399 held fairly steady: 96.5% in Oct–Dec 2025, 96.3% in Jan–Mar 2026, 89.0% in Apr–Jun 2026 and 91.9% in Jul–Sep 2026. A spread of 8 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Oct–Dec 202560 flights96.5%
- Jan–Mar 202654 flights96.3%
- Apr–Jun 202691 flights89.0%
- Jul–Sep 202662 flights91.9%
Scale runs 80% to 100%.
By weekday, AS 399 ranged from 86.5% on Thursday to 97.2% on Friday. With about 38 flights behind each day, a spread of 11 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late AS 399 runs when it is late
AS 399 often beats the schedule: 117 of 264 completed flights, 44%, arrived 15 minutes or more early. Most of the lateness is short. 11 of the 19 late arrivals were under half an hour behind, and 5 reached an hour or more.
- 15+ min early117 flights44.3%
- Within 15 min128 flights48.5%
- 15–29 min late11 flights4.2%
- 30–59 min late3 flights1.1%
- 1–2 hours late3 flights1.1%
- 2+ hours late2 flights0.8%
Scale runs 0% to 100%.
Share of 264 completed flights by arrival against schedule.
Only 17 of 264 completed flights left 15 minutes late or more, too few to say how often the time is made up.
The worst days
Worst days for AS 399
The latest arrival of the period was on 10 March 2026, 2 hours 46 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on five of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 10 March 2026 | 2 hours 46 minutes | Carrier |
| 6 August 2026 | 2 hours 22 minutes | Carrier |
| 22 December 2025 | 1 hour 56 minutes | Carrier |
| 21 June 2026 | 1 hour 20 minutes | Carrier |
| 29 November 2025 | 1 hour 16 minutes | Carrier |
Delay causes
Why AS 399 runs late
Carrier accounts for 83% of the 937 delay minutes carriers reported here, and the remaining four split what is left.
- 83%Carrier
- 15%National Airspace System
- 2%Late-arriving aircraft
The largest share of delay minutes, 83%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 774 of the 937 delay minutes reported here. The split is drawn from 937 delay minutes reported on AS 399.
Cancellations sit at 1.12% 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 1.9% 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 933 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 IAH to SEA (34), but none flew often enough under AS 399 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to SAN to PDX only.
One caution: this is a thin sample. 267 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 399
For a booking, AS 399 has one of the better records a US domestic flight can show: 92.8% on time and 1.12% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- SAN to PDX, every carrier and departure
- PDX to SAN, the return direction
- Alaska Airlines 1392 on the same route79.7%
- Alaska Airlines 1402 on the same route83.3%
- Alaska Airlines 576 on the same route88.3%
- San Diego International (SAN) delay statistics
- Portland International (PDX) 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.