Alaska Airlines Flight 4 Deals & Information (2026/2027)

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Alaska Airlines Flight 4 Route Deals From $158

The cheapest prices found with in the last 7 days for return flights were $288 and $158 for one-way flights to Ronald Reagan Washington National for the period specified. Prices and availability are subject to change. Additional terms apply.

Fri, Jun 5 - Mon, Jun 15
SEA
Seattle - Tacoma Intl.
DCA
Ronald Reagan Washington National
$288 Roundtrip, found 4 hours ago
$288
Roundtrip
found 4 hours ago
Select Alaska Airlines flight, departing Fri, Jun 5 from Seattle - Tacoma Intl. to Ronald Reagan Washington National, returning Mon, Jun 15, priced at $288 found 4 hours ago
Thu, Jun 11 - Mon, Jun 15
SEA
Seattle - Tacoma Intl.
DCA
Ronald Reagan Washington National
$310 Roundtrip, found 2 hours ago
$310
Roundtrip
found 2 hours ago
Select Alaska Airlines flight, departing Thu, Jun 11 from Seattle - Tacoma Intl. to Ronald Reagan Washington National, returning Mon, Jun 15, priced at $310 found 2 hours ago
Tue, Sep 15 - Tue, Sep 22
SEA
Seattle - Tacoma Intl.
DCA
Ronald Reagan Washington National
$310 Roundtrip, found 1 hour ago
$310
Roundtrip
found 1 hour ago
Select Alaska Airlines flight, departing Tue, Sep 15 from Seattle - Tacoma Intl. to Ronald Reagan Washington National, returning Tue, Sep 22, priced at $310 found 1 hour ago
Tue, Sep 15 - Tue, Sep 22
SEA
Seattle - Tacoma Intl.
DCA
Ronald Reagan Washington National
$345 Roundtrip, found 1 hour ago
$345
Roundtrip
found 1 hour ago
Select Alaska Airlines flight, departing Tue, Sep 15 from Seattle - Tacoma Intl. to Ronald Reagan Washington National, returning Tue, Sep 22, priced at $345 found 1 hour ago

Frequently asked questions

What route does flight number AS4 take?
AS4 takes roughly 5 hours and 15 minutes to fly straight from SEA to DCA. Sure, there's magic in the destination, but the journey is always half the fun!
What kind of plane is on flight number AS4?
The route for AS4 is nearly always SEA to Washington, DC Airport (DCA-Ronald Reagan Washington National), and the Airbus A321 is the type of aircraft you'll probably be traveling aboard.
If I am not able to travel due to COVID-19, can I change my flight to a later date?
For more info about changing your AS4 flight with Travelocity, please visit our Customer Service Portal.