Flights Seattle → Washington — September 12, 2026

One way · Economy · 1 adult · price per person

The cheapest flight observed for Saturday, September 12, 2026 on the Seattle–Washington route: Alaska Airlines AS737, from Seattle-Tacoma (SEA) to Washington Dulles (IAD), departs 8:30 AM, arrives 4:43 PM, direct, 5h 13m, $232 per person. Fare as listed by Aviasales: carry-on bag not included (personal item only), 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

Alaska Airlines AS737

Direct · Seattle-Tacoma (SEA) → Washington Dulles (IAD)

Direct

8:30 AM

Sat, Sep 12

Seattle-Tacoma (SEA)

5h 13m

direct

4:43 PM

Sat, Sep 12

Washington Dulles (IAD)

Airline: Alaska Airlines (AS)
Flight: AS737
Departure: Seattle-Tacoma (SEA) · September 12, 2026 · 8:30 AM local time (UTC-7)
Arrival: Washington Dulles (IAD) · September 12, 2026 · 4:43 PM local time (UTC-4)
Stops: Direct (no plane change, as stated by the source; it can include a stop)
Duration: 5h 13m
Carry-on bag: not included (personal item only)
Checked bag: not included
Changes: not allowed
Refund: non-refundable
Last observed price: $232 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–Washington flights on September 12, 2026 on Aviasales.

Lowest price observed in the available data

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