Alaska Airlines Flight 378 Deals & Information (2026/2027)

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Alaska Airlines Flight 378 Route Deals From $99

The cheapest prices found with in the last 7 days for return flights were $197 and $99 for one-way flights to Baltimore Washington Intl. Thurgood Marshall for the period specified. Prices and availability are subject to change. Additional terms apply.

Tue, Sep 22 - Wed, Sep 30
SEA
Seattle - Tacoma Intl.
BWI
Baltimore Washington Intl. Thurgood Marshall
$197 Roundtrip, found 5 days ago
$197
Roundtrip
found 5 days ago
Select Alaska Airlines flight, departing Tue, Sep 22 from Seattle - Tacoma Intl. to Baltimore Washington Intl. Thurgood Marshall, returning Wed, Sep 30, priced at $197 found 5 days ago
Thu, Sep 17 - Thu, Sep 24
SEA
Seattle - Tacoma Intl.
BWI
Baltimore Washington Intl. Thurgood Marshall
$197 Roundtrip, found 4 hours ago
$197
Roundtrip
found 4 hours ago
Select Alaska Airlines flight, departing Thu, Sep 17 from Seattle - Tacoma Intl. to Baltimore Washington Intl. Thurgood Marshall, returning Thu, Sep 24, priced at $197 found 4 hours ago
Wed, May 13 - Mon, May 18
SEA
Seattle - Tacoma Intl.
BWI
Baltimore Washington Intl. Thurgood Marshall
$218 Roundtrip, found 1 day ago
$218
Roundtrip
found 1 day ago
Select Alaska Airlines flight, departing Wed, May 13 from Seattle - Tacoma Intl. to Baltimore Washington Intl. Thurgood Marshall, returning Mon, May 18, priced at $218 found 1 day ago
Wed, Apr 15 - Thu, Apr 23
SEA
Seattle - Tacoma Intl.
BWI
Baltimore Washington Intl. Thurgood Marshall
$229 Roundtrip, found 9 hours ago
$229
Roundtrip
found 9 hours ago
Select Alaska Airlines flight, departing Wed, Apr 15 from Seattle - Tacoma Intl. to Baltimore Washington Intl. Thurgood Marshall, returning Thu, Apr 23, priced at $229 found 9 hours ago
Wed, Mar 11 - Tue, Mar 17
SEA
Seattle - Tacoma Intl.
BWI
Baltimore Washington Intl. Thurgood Marshall
$234 Roundtrip, found 3 days ago
$234
Roundtrip
found 3 days ago
Select Alaska Airlines flight, departing Wed, Mar 11 from Seattle - Tacoma Intl. to Baltimore Washington Intl. Thurgood Marshall, returning Tue, Mar 17, priced at $234 found 3 days ago

Frequently asked questions

What route does flight number AS378 take?
You'll be landing at Seattle - Tacoma Intl. Airport (SEA) from OGG if you're traveling on flight number AS378. You'll be in the air for 5 hours and 32 minutes during this trip. It's also worthwhile noting that the flight conveniently travels direct.
What kind of plane is on flight number AS378?
You'll most likely find yourself jumping on board the Boeing 737-900 if your flight number is AS378. This flight almost always jets off from OGG and touches down at SEA.
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 AS378 flight with Travelocity, please visit our Customer Service Portal.