Flights Seattle → Boston — September 20, 2026

One way · Economy · 1 adult · price per person

The cheapest flight observed for Sunday, September 20, 2026 on the Seattle–Boston route: JetBlue B6398, from Seattle-Tacoma (SEA) to Boston Logan (BOS), departs 11:42 PM, arrives 8:06 AM the next day, direct, 5h 24m, $283 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 10, 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 B6398

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

Direct

11:42 PM

Sun, Sep 20

Seattle-Tacoma (SEA)

5h 24m

direct

8:06 AM⁺¹

Mon, Sep 21

Boston Logan (BOS)

Airline: JetBlue (B6)
Flight: B6398
Departure: Seattle-Tacoma (SEA) · September 20, 2026 · 11:42 PM local time (UTC-7)
Arrival: Boston Logan (BOS) · September 21, 2026 · 8:06 AM local time (UTC-4) · next day
Stops: Direct (no plane change, as stated by the source; it can include a stop)
Duration: 5h 24m
Carry-on bag: included
Checked bag: not included
Changes: not allowed
Refund: non-refundable
Last observed price: $283 per person, one way
Observed: Price and fare conditions found in an Aviasales search on September 10, 2026 · read by AirSource on September 10, 2026, 20:47 UTC

Looking for other times? All Seattle–Boston flights on September 20, 2026 on Aviasales.

Lowest price observed in the available data

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