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

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Alaska Airlines Flight 4 Route Deals From $155

The cheapest prices found with in the last 7 days for return flights were $283 and $155 for one-way flights to Ronald Reagan Washington National for the period specified. Prices and availability are subject to change. Additional terms apply.

Thu, Jul 9 - Tue, Jul 14
SEA
Seattle - Tacoma Intl.
DCA
Ronald Reagan Washington National
$283 Roundtrip, found 19 hours ago
$283
Roundtrip
found 19 hours ago
Select Alaska Airlines flight, departing Thu, Jul 9 from Seattle - Tacoma Intl. to Ronald Reagan Washington National, returning Tue, Jul 14, priced at $283 found 19 hours ago
Thu, Jun 4 - Sat, Jun 13
SEA
Seattle - Tacoma Intl.
DCA
Ronald Reagan Washington National
$283 Roundtrip, found 1 day ago
$283
Roundtrip
found 1 day ago
Select Alaska Airlines flight, departing Thu, Jun 4 from Seattle - Tacoma Intl. to Ronald Reagan Washington National, returning Sat, Jun 13, priced at $283 found 1 day ago
Fri, Jun 5 - Wed, Jun 10
SEA
Seattle - Tacoma Intl.
DCA
Ronald Reagan Washington National
$303 Roundtrip, just found
$303
Roundtrip
just found
Select Alaska Airlines flight, departing Fri, Jun 5 from Seattle - Tacoma Intl. to Ronald Reagan Washington National, returning Wed, Jun 10, priced at $303 just found
Wed, Sep 9 - Tue, Sep 15
SEA
Seattle - Tacoma Intl.
DCA
Ronald Reagan Washington National
$305 Roundtrip, found 1 day ago
$305
Roundtrip
found 1 day ago
Select Alaska Airlines flight, departing Wed, Sep 9 from Seattle - Tacoma Intl. to Ronald Reagan Washington National, returning Tue, Sep 15, priced at $305 found 1 day ago
Sat, Jun 6 - Tue, Jun 9
SEA
Seattle - Tacoma Intl.
DCA
Ronald Reagan Washington National
$310 Roundtrip, found 16 hours ago
$310
Roundtrip
found 16 hours ago
Select Alaska Airlines flight, departing Sat, Jun 6 from Seattle - Tacoma Intl. to Ronald Reagan Washington National, returning Tue, Jun 9, priced at $310 found 16 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.