Flight profile · Alaska Airlines
AS538
Seattle (SEA) to Chicago (ORD) · scheduled 6:00 PM – 11:59 PM
How AS538 performs
1,047 operations, 2023-07-01 to 2026-06-30.
AS538 arrived on time 80.4% of the time, against 77.6% for all SEA → ORD flights — this specific departure is 2.8 percentage points better than the route as a whole. Against Alaska Airlines’s own flights on this route it is 5.7 points better.
Source: US DOT Bureau of Transportation Statistics · 1,047 operations between 2023-07-01 to 2026-06-30
Against the rest of the route
| On time | Cancelled | Median delay | Severe | Flights | |
|---|---|---|---|---|---|
| AS538 | 80.4% | 0.96% | -3 min | 5.1% | 1,047 |
| Alaska Airlines on SEA → ORD | 74.7% | 0.71% | -2 min | 5.7% | 5,470 |
| All SEA → ORD flights | 77.6% | 0.93% | -5 min | 6.7% | 15,693 |
Source: FlyerIntel analysis of US DOT BTS data · 2023-07-01 to 2026-06-30
By day of week
Does AS538 run worse on particular days?
Wednesday is historically the most reliable day and Thursday the least, a gap of 11.6 percentage points.
Source: FlyerIntel analysis of US DOT BTS data · 2023-07-01 to 2026-06-30 · Days with fewer than 120 operations are not scored.
Data and methodology
Calculated by FlyerIntel from 1,047 records of AS538 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.