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

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Alaska Airlines Flight 4 Route Deals From $170

The cheapest prices found with in the last 7 days for return flights were $318 and $170 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 - Sun, Jun 7
SEA
Seattle - Tacoma Intl.
DCA
Ronald Reagan Washington National
$318 Roundtrip, found 9 hours ago
$318
Roundtrip
found 9 hours ago
Select Alaska Airlines flight, departing Fri, Jun 5 from Seattle - Tacoma Intl. to Ronald Reagan Washington National, returning Sun, Jun 7, priced at $318 found 9 hours ago
Tue, Sep 8 - Sat, Sep 12
SEA
Seattle - Tacoma Intl.
DCA
Ronald Reagan Washington National
$325 Roundtrip, found 2 days ago
$325
Roundtrip
found 2 days ago
Select Alaska Airlines flight, departing Tue, Sep 8 from Seattle - Tacoma Intl. to Ronald Reagan Washington National, returning Sat, Sep 12, priced at $325 found 2 days ago
Tue, Sep 15 - Tue, Sep 22
SEA
Seattle - Tacoma Intl.
DCA
Ronald Reagan Washington National
$325 Roundtrip, found 12 hours ago
$325
Roundtrip
found 12 hours ago
Select Alaska Airlines flight, departing Tue, Sep 15 from Seattle - Tacoma Intl. to Ronald Reagan Washington National, returning Tue, Sep 22, priced at $325 found 12 hours 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.