Alaska Airlines Flight WN378 Deals & Information (2025/2026)

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Alaska Airlines Flight 378 Route Deals From $139

The cheapest prices found with in the last 7 days for return flights were $246 and $139 for one-way flights to Baltimore Washington Intl. Thurgood Marshall for the period specified. Prices and availability are subject to change. Additional terms apply.

Wed, Oct 8 - Tue, Oct 14
SEA
Seattle - Tacoma Intl.
BWI
Baltimore Washington Intl. Thurgood Marshall
$246 Roundtrip, found 7 hours ago
$246
Roundtrip
found 7 hours ago
Select Alaska Airlines flight, departing Wed, Oct 8 from Seattle - Tacoma Intl. to Baltimore Washington Intl. Thurgood Marshall, returning Tue, Oct 14, priced at $246 found 7 hours ago
Tue, Sep 9 - Wed, Sep 10
SEA
Seattle - Tacoma Intl.
BWI
Baltimore Washington Intl. Thurgood Marshall
$271 Roundtrip, found 6 days ago
$271
Roundtrip
found 6 days ago
Select Alaska Airlines flight, departing Tue, Sep 9 from Seattle - Tacoma Intl. to Baltimore Washington Intl. Thurgood Marshall, returning Wed, Sep 10, priced at $271 found 6 days ago
Mon, Sep 15 - Tue, Sep 23
SEA
Seattle - Tacoma Intl.
BWI
Baltimore Washington Intl. Thurgood Marshall
$277 Roundtrip, just found
$277
Roundtrip
just found
Select Alaska Airlines flight, departing Mon, Sep 15 from Seattle - Tacoma Intl. to Baltimore Washington Intl. Thurgood Marshall, returning Tue, Sep 23, priced at $277 just found

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.