Flights Boston → Seattle — September 21, 2026

One way · Economy · 1 adult · price per person

The cheapest flight observed for Monday, September 21, 2026 on the Boston–Seattle route: JetBlue B6397, from Boston Logan (BOS) to Seattle-Tacoma (SEA), departs 7:20 PM, arrives 10:37 PM, direct, 6h 17m, $252 per person. Fare as listed by Aviasales: carry-on bag included, checked bag not included, changes not allowed, non-refundable. Price found in an Aviasales search on September 6, 2026 and read by AirSource on September 10, 2026, 20:47 UTC: it is not guaranteed and is confirmed on Aviasales at booking time.

Lowest price observed in the available data

JetBlue B6397

Direct · Boston Logan (BOS) → Seattle-Tacoma (SEA)

Direct

7:20 PM

Mon, Sep 21

Boston Logan (BOS)

6h 17m

direct

10:37 PM

Mon, Sep 21

Seattle-Tacoma (SEA)

Airline: JetBlue (B6)
Flight: B6397
Departure: Boston Logan (BOS) · September 21, 2026 · 7:20 PM local time (UTC-4)
Arrival: Seattle-Tacoma (SEA) · September 21, 2026 · 10:37 PM local time (UTC-7)
Stops: Direct (no plane change, as stated by the source; it can include a stop)
Duration: 6h 17m
Carry-on bag: included
Checked bag: not included
Changes: not allowed
Refund: non-refundable
Last observed price: $252 per person, one way
Observed: Price and fare conditions found in an Aviasales search on September 6, 2026 · read by AirSource on September 10, 2026, 20:47 UTC · more than 48 hours ago

Looking for other times? All Boston–Seattle flights on September 21, 2026 on Aviasales.

Lowest price observed in the available data

Nearby dates