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 $273 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.

Sat, Apr 25 - Sat, May 2
SEA
Seattle - Tacoma Intl.
BWI
Baltimore Washington Intl. Thurgood Marshall
$273 Roundtrip, found 6 hours ago
$273
Roundtrip
found 6 hours ago
Select Alaska Airlines flight, departing Sat, Apr 25 from Seattle - Tacoma Intl. to Baltimore Washington Intl. Thurgood Marshall, returning Sat, May 2, priced at $273 found 6 hours ago
Wed, Sep 2 - Tue, Sep 15
SEA
Seattle - Tacoma Intl.
BWI
Baltimore Washington Intl. Thurgood Marshall
$278 Roundtrip, found 1 day ago
$278
Roundtrip
found 1 day ago
Select Alaska Airlines flight, departing Wed, Sep 2 from Seattle - Tacoma Intl. to Baltimore Washington Intl. Thurgood Marshall, returning Tue, Sep 15, priced at $278 found 1 day ago
Mon, May 11 - Wed, May 13
SEA
Seattle - Tacoma Intl.
BWI
Baltimore Washington Intl. Thurgood Marshall
$303 Roundtrip, found 11 hours ago
$303
Roundtrip
found 11 hours ago
Select Alaska Airlines flight, departing Mon, May 11 from Seattle - Tacoma Intl. to Baltimore Washington Intl. Thurgood Marshall, returning Wed, May 13, priced at $303 found 11 hours ago
Fri, May 8 - Mon, May 11
SEA
Seattle - Tacoma Intl.
BWI
Baltimore Washington Intl. Thurgood Marshall
$314 Roundtrip, found 4 hours ago
$314
Roundtrip
found 4 hours ago
Select Alaska Airlines flight, departing Fri, May 8 from Seattle - Tacoma Intl. to Baltimore Washington Intl. Thurgood Marshall, returning Mon, May 11, priced at $314 found 4 hours ago
Fri, Sep 18 - Mon, Sep 21
SEA
Seattle - Tacoma Intl.
BWI
Baltimore Washington Intl. Thurgood Marshall
$317 Roundtrip, found 10 hours ago
$317
Roundtrip
found 10 hours ago
Select Alaska Airlines flight, departing Fri, Sep 18 from Seattle - Tacoma Intl. to Baltimore Washington Intl. Thurgood Marshall, returning Mon, Sep 21, priced at $317 found 10 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.