Flight profile · Alaska Airlines
AS328
Seattle (SEA) to Chicago (ORD) · scheduled 11:40 PM – 5:00 AM
How AS328 performs
838 operations, July 2023 – July 2026.
Source: US DOT Bureau of Transportation Statistics · 838 operations, July 2023 – July 2026 · If AS328 is cancelled or significantly changed, DOT’s automatic refund rule may entitle you to your money back. The refund checker walks through eligibility.
Where AS328 is right now
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Against the rest of the route
| Flight or route | On time | Cancelled | Median delay | Severe | Flights |
|---|---|---|---|---|---|
| AS328 | 78.2% | 0.48% | -5 min | 3.8% | 838 |
| Alaska Airlines on SEA → ORD | 74.1% | 0.77% | -2 min | 5.8% | 5,678 |
| All SEA → ORD flights | 77.3% | 0.95% | -5 min | 6.8% | 16,300 |
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – July 2026
Why AS328 runs late
Where US DOT attributed the delay minutes on this flight.
crew, maintenance, boarding and fueling, all within the carrier’s control
the inbound aircraft was late, so this flight started late
airspace and airport capacity, including weather-driven flow control
screening or terminal security incidents
weather severe enough to stop this flight specifically
Share of the delay minutes US DOT attributed to each cause for AS328 on SEA → ORD. 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 AS328 comes in late, and what that does to the departure.
When the aircraft came in 15 or more minutes late, AS328 pushed back an average of 16 minutes late; when it came in on time or early, an average of 5 minutes late.
Each departure is matched to the flight the same aircraft flew into SEA just before it, using the tail number in the DOT file, 788 of 834 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 |
|---|---|---|---|
| AS328 | 35% | 39% | 16% |
| Network, same turn | 23% | 40% | 9% |
The schedule leaves a long gap on the ground, which gives a late aircraft room to catch up before this flight pushes back.
The network row is every flight with a scheduled turn of 90 minutes to 3 hours. How often AS328’s aircraft landed 15 or more minutes late is higher than the network’s and, once the aircraft was late, how often AS328 left 15 or more minutes late is about the same as 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 SEA late, does that still matter by the time it reaches ORD?
AS328 pushes back an average of 9.2 minutes late and reaches the gate at ORD an average of 2.6 minutes late. The 6.6 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 18.0 minutes on the taxiways at SEA is about what any departure from the airport in that hour spends.
On arrival at ORD, AS328 spends 12.5 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 5.3 minutes shorter than a typical ORD arrival (17.8 min).
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 ORD. Taxi-out is gate to wheels up and sits inside the scheduled block rather than on top of it; the comparison is 20,487 departures from SEA scheduled in the clock hour AS328 most often leaves in. Taxi-in is landing to gate, compared against every arrival FlyerIntel has on file at ORD (952,666 flights), not just AS328’s own. More on taxi time.
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – July 2026
The hour it leaves SEA
Part of any flight’s record belongs to the clock rather than to the flight. AS328 has one departure time, so this is what that time is worth.
On-time arrival rate. 20,487 departures from SEA are scheduled in the 11 PM–12 AM hour over the period, against 510,205 across the whole day.
AS328 is scheduled out of SEA at 11:40 PM, in the 11 PM–12 AM bank. Departures from SEA in that hour arrive on time 80.4% of the time against 79.1% across the airport’s whole day, so the hour AS328 leaves in is an ordinary one for SEA and explains nothing about its record either way.
The two airport figures cover every departure from SEA 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.
Other routes AS328 has flown
A flight number is a slot in a schedule, and carriers reassign it. These are the other city pairs this number served in the analysis period.
| Route | Operated | Flights | On time |
|---|---|---|---|
| BZN→SEA Bozeman to Seattle | February 12, 2026 – March 17, 2026 | 34 | — |
| FAI→SEA Fairbanks to Seattle | January 7, 2026 – February 11, 2026 | 36 | — |
| SEA→GEG Seattle to Spokane | December 2–17, 2025 | 16 | — |
| SEA→LAX Seattle to Los Angeles | February 1, 2025 | 1 | — |
Because the same number has served different journeys, the statistics above describe only the route AS328 currently operates. Blending them would produce an average of two different flights.
When it goes wrong
The average describes a usual day. This is the day that ruins a connection.
35 min late
against a median of 5 min early
Percentiles over 838 operations; cancelled and diverted flights are counted separately.
Source: US DOT Bureau of Transportation Statistics · Data covering July 2023 – July 2026
Other flights on this route
Same airports, same journey, different odds of arriving on time.
| Flight | Airline | On time | Median arrival | Operations |
|---|---|---|---|---|
| UA747 | United Airlines | 84.7% | 11 min early | 1,124 |
| DL2055 | Delta Air Lines | 84.1% | 7 min early | 712 |
| AS538 | Alaska Airlines | 80.2% | 3 min early | 1,077 |
| AS328 this flight | Alaska Airlines | 78.2% | 5 min early | 838 |
| DL2108 | Delta Air Lines | 77.0% | 5 min early | 743 |
| AS410 | Alaska Airlines | 60.5% | 7 min late | 900 |
Every departure listed carries at least 600 operations, so the comparison is between figures that mean something. AS328 is placed in the same ordering rather than left out of it; the rows around it are the most punctual departures on the route, not all of them, so this is a comparison and not a rank. Schedules change; confirm the departure still operates before booking around this.
Data and methodology
Calculated by FlyerIntel from 838 records of AS328 operating SEA → ORD, 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
Analysis last recomputed