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

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Alaska Airlines Flight 378 Route Deals From $144

The cheapest prices found with in the last 7 days for return flights were $237 and $144 for one-way flights to Baltimore Washington Intl. Thurgood Marshall for the period specified. Prices and availability are subject to change. Additional terms apply.

Mon, Sep 14 - Tue, Sep 15
SEA
Seattle - Tacoma Intl.
BWI
Baltimore Washington Intl. Thurgood Marshall
$237 Roundtrip, found 17 hours ago
$237
Roundtrip
found 17 hours ago
Select Alaska Airlines flight, departing Mon, Sep 14 from Seattle - Tacoma Intl. to Baltimore Washington Intl. Thurgood Marshall, returning Tue, Sep 15, priced at $237 found 17 hours ago
Fri, Sep 18 - Thu, Sep 24
SEA
Seattle - Tacoma Intl.
BWI
Baltimore Washington Intl. Thurgood Marshall
$297 Roundtrip, found 12 hours ago
$297
Roundtrip
found 12 hours ago
Select Alaska Airlines flight, departing Fri, Sep 18 from Seattle - Tacoma Intl. to Baltimore Washington Intl. Thurgood Marshall, returning Thu, Sep 24, priced at $297 found 12 hours 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.