Flight profile · Alaska Airlines
AS358
Portland (PDX) to Boston (BOS) · scheduled 7:00 AM – 3:25 PM
How AS358 performs
1,055 operations, July 2023 – July 2026.
AS358 arrived on time 81.6% of the time, against 76.1% for all PDX → BOS flights, so this departure is 5.5 percentage points better than the route as a whole.
Source: US DOT Bureau of Transportation Statistics · 1,055 operations, July 2023 – July 2026 · If AS358 is cancelled or significantly changed, DOT’s automatic refund rule may entitle you to your money back. The refund checker walks through eligibility.
Where AS358 is right now
A live reading, only if you ask for it. It is not part of the reliability record above.
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Against the rest of the route
| Flight or route | On time | Cancelled | Median delay | Severe | Flights |
|---|---|---|---|---|---|
| AS358 | 81.6% | 0.76% | -6 min | 4.8% | 1,055 |
| Alaska Airlines on PDX → BOS | 81.7% | 0.66% | -5 min | 4.0% | 1,522 |
| All PDX → BOS flights | 76.1% | 0.93% | -3 min | 7.6% | 2,052 |
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – July 2026
Why AS358 runs late
Where US DOT attributed the delay minutes on this flight.
airspace and airport capacity, including weather-driven flow control
crew, maintenance, boarding and fueling, all within the carrier’s control
the inbound aircraft was late, so this flight started late
weather severe enough to stop this flight specifically
Share of the delay minutes US DOT attributed to each cause for AS358 on PDX → BOS. Only delays of 15 minutes or more are attributed.
Source: US DOT Bureau of Transportation Statistics · Data covering July 2023 – July 2026
Does a late aircraft delay this flight?
How often the plane that flies AS358 comes in late, and what that does to the departure.
AS358 is usually the aircraft’s first flight of the day: the schedule gives it a median of 8.5 hours on the ground at PDX, so its “inbound” is mostly the aircraft’s arrival the evening before.
When the aircraft came in 15 or more minutes late, AS358 pushed back an average of 7 minutes late; when it came in on time or early, an average of 6 minutes late.
Each departure is matched to the flight the same aircraft flew into PDX just before it, using the tail number in the DOT file, 916 of 1,047 departures in all. A departure is left out when that flight is unknown, was cancelled or diverted, or the aircraft had sat for more than 12 hours. A flight the airline cancelled never left and is not in the count, and one flown by a substitute aircraft is matched to the aircraft that flew it, not to the one first planned.
Against the network at the same turn length
| Share of departures | Inbound landed 15+ late | Left 15+ late after a late inbound | Left 15+ late after an on-time inbound |
|---|---|---|---|
| AS358 | 20% | 16% | 14% |
| Network, same turn | 29% | 12% | 9% |
A night on the ground absorbs most of a late arrival, so a late inbound matters far less on a turn this long than on a same-day one.
The network row is every flight with a scheduled turn of 6 hours or more, usually overnight. How often AS358’s aircraft landed 15 or more minutes late is lower than the network’s and, once the aircraft was late, how often AS358 left 15 or more minutes late is higher than the network’s.
More: Which Flight Numbers Pay for a Late Aircraft lists the flight numbers that pass a late aircraft on.
Source: US DOT Bureau of Transportation Statistics · Data covering July 2023 – July 2026
From pushback to gate
When it leaves PDX late, does that still matter by the time it reaches BOS?
AS358 pushes back an average of 6.3 minutes late and reaches the gate at BOS an average of 0.4 minutes late. The 5.9 minutes between those two figures are slack the published schedule already carries, which is why a late pushback on this flight does not reliably become a late arrival. Its 19.4 minutes on the taxiways at PDX is about what any departure from the airport in that hour spends.
On arrival at BOS, AS358 spends 9.4 min taxiing from touchdown to the gate — ground time a connecting passenger sits through before they can even leave the aircraft, on top of however late the flight itself ran. That is about what any arrival at BOS spends on the ground before reaching the gate.
Departure delay is averaged over every pushback and arrival delay over every completed arrival, so the two counts differ by the flights that never reached BOS. Taxi-out is gate to wheels up and sits inside the scheduled block rather than on top of it; the comparison is 23,173 departures from PDX scheduled in the clock hour AS358 most often leaves in. Taxi-in is landing to gate, compared against every arrival FlyerIntel has on file at BOS (440,886 flights), not just AS358’s own. More on taxi time.
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – July 2026
The hour it leaves PDX
Part of any flight’s record belongs to the clock rather than to the flight. AS358 has one departure time, so this is what that time is worth.
On-time arrival rate. 23,173 departures from PDX are scheduled in the 7 AM–8 AM hour over the period, against 187,633 across the whole day.
AS358 is scheduled out of PDX at 7:00 AM, in the 7 AM–8 AM bank. Departures from PDX in that hour arrive on time 85.8% of the time against 83.2% across the airport’s whole day, so the hour AS358 leaves in is an ordinary one for PDX and explains nothing about its record either way.
The two airport figures cover every departure from PDX to every destination, so they describe the slot rather than this journey — the like-for-like comparison against the route is above. Hours are scheduled local, and a number whose schedule moved between banks inside the period has no single hour and is not described here at all. Why the hour matters.
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – July 2026 · Hours below 120 departures are not scored.
By day of week
Does AS358 run worse on particular days?
Sunday is historically the most reliable day and Monday the least, a gap of 10.6 percentage points.
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – July 2026 · Days with fewer than 120 operations are not scored.
When it goes wrong
The average describes a usual day. This is the day that ruins a connection.
30 min late
against a median of 6 min early
Percentiles over 1,055 operations; cancelled and diverted flights are counted separately.
Source: US DOT Bureau of Transportation Statistics · Data covering July 2023 – July 2026
Data and methodology
Calculated by FlyerIntel from 1,055 records of AS358 operating PDX → BOS, published by the US DOT Bureau of Transportation Statistics. A flight counts as delayed when it arrives 15 or more minutes after schedule. Cancelled and diverted flights are excluded from the on-time rate and reported separately. Flight numbers are resolved as carrier plus number plus route, because the same number serves different routes over time.
Full methodology · Data sources · Report a problem
Related research: Most and Least Reliable Flight Numbers · The Delay You Inherit · Making Up Time in the Air
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