Flight profile · Alaska Airlines
AS390
San Diego (SAN) to Boston (BOS) · scheduled 8:40 AM – 6:59 PM
How AS390 performs
1,043 operations, 2023-07-02 to 2026-06-30.
AS390 arrived on time 74.9% of the time, against 76.0% for all SAN → BOS flights — this specific departure is 1.1 percentage points worse than the route as a whole. Against Alaska Airlines’s own flights on this route it is 1.1 points worse.
Source: US DOT Bureau of Transportation Statistics · 1,043 operations between 2023-07-02 to 2026-06-30
Against the rest of the route
| On time | Cancelled | Median delay | Severe | Flights | |
|---|---|---|---|---|---|
| AS390 | 74.9% | 0.58% | -4 min | 10.4% | 1,043 |
| Alaska Airlines on SAN → BOS | 75.9% | 0.75% | -3 min | 9.0% | 1,330 |
| All SAN → BOS flights | 76.0% | 0.80% | -6 min | 8.6% | 4,875 |
Source: FlyerIntel analysis of US DOT BTS data · 2023-07-02 to 2026-06-30
By day of week
Does AS390 run worse on particular days?
Saturday is historically the most reliable day and Friday the least, a gap of 15.9 percentage points.
Source: FlyerIntel analysis of US DOT BTS data · 2023-07-02 to 2026-06-30 · Days with fewer than 120 operations are not scored.
Data and methodology
Calculated by FlyerIntel from 1,043 records of AS390 operating SAN → 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.