Flight number record
AS 559
Alaska Airlines · Portland to Burbank
- Route
- PDX → BUR
- Departs
- 17:57
- Flights
- 289
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s AS 559, check with Alaska Airlines.
AS 559 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 11 points better than the national rate of 77.3%. When something does go wrong the average delay runs about an hour. That rests on 289 flights, with a median arrival 11 minutes early.
Set against the rest of the country, AS 559's record is 11 points better than the US average of 77.3%. That gap is worth roughly 106 fewer late arrivals for every thousand flights.
Key figures
On time
87.9%
Arrivals under 15 minutes late, of 289 completed flights
Avg delay
55 min
Across delayed arrivals only, not all flights
Cancelled
0.00%
National rate is 1.89%
1 hour+ late
4.2%
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 559 flies
AS 559 flies PDX to BUR without a single fixed slot. Its most common scheduled departure was 17:57, used on 168 of 289 flights, with 17:55 (90 flights) next.
- Departs 17:57168 flights58.1%
- Departs 17:5590 flights31.1%
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 17:57 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.0%, and AS 559 runs 20 points better at 87.9%. 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 559 next to PDX to BUR
Every carrier on PDX to BUR combined arrived on time 86.5% of the time across 1,001 flights, so AS 559 is about level with it. Alaska flew 982 flights on the same city pair under all its flight numbers, including this one, and those ran 87.0% on time. Across its whole network Alaska Airlines managed 79.7%, which this flight beats by 8 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| AS 559thin sample | 289 | 87.9% | 55 min | 0.00% | A+ |
| All Alaska Airlines on PDX–BUR | 982 | 87.0% | 54 min | 0.81% | A+ |
| All carriers on PDX–BUR | 1,001 | 86.5% | 54 min | 0.80% | A+ |
| Alaska Airlines, whole network | 309,844 | 79.7% | 52 min | 1.20% | B |
Across the year
AS 559 quarter by quarter
Quarter by quarter AS 559 held fairly steady: 84.4% in Oct–Dec 2025, 90.8% in Jan–Mar 2026, 89.8% in Apr–Jun 2026 and 85.2% in Jul–Sep 2026. A spread of 6 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Oct–Dec 202564 flights84.4%
- Jan–Mar 202676 flights90.8%
- Apr–Jun 202688 flights89.8%
- Jul–Sep 202661 flights85.2%
Scale runs 75% to 95%.
By weekday, AS 559 did best on Wednesday at 100.0% on time and worst on Sunday at 73.3%. Each day rests on about 41 flights, so a gap of 27 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late AS 559 runs when it is late
AS 559 often beats the schedule: 97 of 289 completed flights, 34%, arrived 15 minutes or more early. The 35 late arrivals split 12 under half an hour, 11 between 30 and 60 minutes, and 12 an hour or more.
- 15+ min early97 flights33.6%
- Within 15 min157 flights54.3%
- 15–29 min late12 flights4.2%
- 30–59 min late11 flights3.8%
- 1–2 hours late8 flights2.8%
- 2+ hours late4 flights1.4%
Scale runs 0% to 100%.
Share of 289 completed flights by arrival against schedule.
A late pushback is often recovered here: of 43 departures that left 15 minutes late or more, 13 still arrived on time. Only 5 left on time and still arrived late.
The worst days
Worst days for AS 559
The latest arrival of the period was on 21 June 2026, 3 hours 26 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 |
|---|---|---|
| 21 June 2026 | 3 hours 26 minutes | Late-arriving aircraft |
| 2 November 2025 | 2 hours 34 minutes | Carrier |
| 18 April 2026 | 2 hours 26 minutes | Carrier |
| 6 March 2026 | 2 hours 5 minutes | Late-arriving aircraft |
| 30 April 2026 | 1 hour 58 minutes | Late-arriving aircraft |
Delay causes
Why AS 559 runs late
Late-arriving aircraft accounts for 64% of the 1,940 delay minutes carriers reported here, and the remaining four split what is left.
- 64%Late-arriving aircraft
- 29%Carrier
- 8%National Airspace System
64% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 1,940 reported delay minutes here, that single category outweighs weather by 64 to one. The split is drawn from 1,940 delay minutes reported on AS 559.
Cancellations are rare at 0.00%, below the national 1.89% and low enough to earn the plus on the grade. Almost no flights are 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 4.2% 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 817 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 289 flights under AS 559 in the data flew PDX to BUR. 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. 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 559
For a booking, AS 559 has one of the better records a US domestic flight can show: 87.9% on time and 0.00% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- PDX to BUR, every carrier and departure
- BUR to PDX, the return direction
- Portland International (PDX) delay statistics
- Hollywood Burbank (BUR) 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.