Flight profile · JetBlue
B6397
Boston (BOS) to Seattle (SEA) · scheduled 7:00 AM – 10:20 AM
How B6397 performs
310 operations, 2024-06-13 to 2026-06-30.
B6397 arrived on time 85.1% of the time, against 75.9% for all BOS → SEA flights — this specific departure is 9.2 percentage points better than the route as a whole. Against JetBlue’s own flights on this route it is 12.9 points better.
Source: US DOT Bureau of Transportation Statistics · 310 operations between 2024-06-13 to 2026-06-30
Against the rest of the route
| On time | Cancelled | Median delay | Severe | Flights | |
|---|---|---|---|---|---|
| B6397 | 85.1% | 0.32% | -14 min | 5.8% | 310 |
| JetBlue on BOS → SEA | 72.2% | 0.52% | -5 min | 12.6% | 1,146 |
| All BOS → SEA flights | 75.9% | 0.95% | -6 min | 6.9% | 7,588 |
Source: FlyerIntel analysis of US DOT BTS data · 2024-06-13 to 2026-06-30
Other routes B6397 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 |
|---|---|---|---|
| BOS→ATL Boston to Atlanta | 2024-11-22 – 2025-04-29 | 158 | 70.1% |
Because the same number has served different journeys, the statistics above describe only the route B6397 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.
26 min late
against a median of 14 min early
Percentiles over 310 operations. Cancelled and diverted flights have no arrival time and are counted separately rather than as very late arrivals.
Why B6397 runs late
Where US DOT attributed the delay minutes on this flight.
airspace and airport capacity, including weather-driven flow control
crew, maintenance, boarding, fuelling — 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 B6397 on BOS → SEA. A single late flight can carry more than one cause, and only delays of fifteen minutes or more are attributed at all.
Other departures on BOS → SEA
Same airports, same journey — and not the same odds of arriving on time.
| Flight | Airline | On time | Median arrival | Operations |
|---|---|---|---|---|
| DL384 | Delta Air Lines | 82.6% | 9 min early | 1,030 |
| AS537 | Alaska Airlines | 76.7% | 6 min early | 600 |
| AS459 | Alaska Airlines | 75.3% | 4 min early | 999 |
| DL324 | Delta Air Lines | 69.8% | 1 min early | 750 |
Every departure listed carries at least 600 operations, so the comparison is between figures that mean something. Schedules change; confirm the departure still operates before booking around this.
Data and methodology
Calculated by FlyerIntel from 310 records of B6397 operating BOS → SEA, 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.
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