Alaska Airlines Flight 378 Deals & Information (2025/2026)

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Alaska Airlines Flight 378 Route Deals From $77

The cheapest prices found with in the last 7 days for return flights were $154 and $77 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, Sep 3 - Wed, Sep 17
SEA
Seattle - Tacoma Intl.
BWI
Baltimore Washington Intl. Thurgood Marshall
$154 Roundtrip, found 6 hours ago
$154
Roundtrip
found 6 hours ago
Select Alaska Airlines flight, departing Wed, Sep 3 from Seattle - Tacoma Intl. to Baltimore Washington Intl. Thurgood Marshall, returning Wed, Sep 17, priced at $154 found 6 hours ago
Tue, Sep 2 - Sat, Sep 6
SEA
Seattle - Tacoma Intl.
BWI
Baltimore Washington Intl. Thurgood Marshall
$167 Roundtrip, found 1 hour ago
$167
Roundtrip
found 1 hour ago
Select Alaska Airlines flight, departing Tue, Sep 2 from Seattle - Tacoma Intl. to Baltimore Washington Intl. Thurgood Marshall, returning Sat, Sep 6, priced at $167 found 1 hour ago
Thu, Sep 4 - Wed, Sep 10
SEA
Seattle - Tacoma Intl.
BWI
Baltimore Washington Intl. Thurgood Marshall
$176 Roundtrip, just found
$176
Roundtrip
just found
Select Alaska Airlines flight, departing Thu, Sep 4 from Seattle - Tacoma Intl. to Baltimore Washington Intl. Thurgood Marshall, returning Wed, Sep 10, priced at $176 just found
Mon, Aug 25 - Tue, Aug 26
SEA
Seattle - Tacoma Intl.
BWI
Baltimore Washington Intl. Thurgood Marshall
$188 Roundtrip, found 2 days ago
$188
Roundtrip
found 2 days ago
Select Alaska Airlines flight, departing Mon, Aug 25 from Seattle - Tacoma Intl. to Baltimore Washington Intl. Thurgood Marshall, returning Tue, Aug 26, priced at $188 found 2 days ago
Wed, Aug 20 - Sat, Aug 23
SEA
Seattle - Tacoma Intl.
BWI
Baltimore Washington Intl. Thurgood Marshall
$197 Roundtrip, just found
$197
Roundtrip
just found
Select Alaska Airlines flight, departing Wed, Aug 20 from Seattle - Tacoma Intl. to Baltimore Washington Intl. Thurgood Marshall, returning Sat, Aug 23, priced at $197 just found
Wed, Sep 3 - Tue, Sep 9
SEA
Seattle - Tacoma Intl.
BWI
Baltimore Washington Intl. Thurgood Marshall
$202 Roundtrip, found 1 day ago
$202
Roundtrip
found 1 day ago
Select Alaska Airlines flight, departing Wed, Sep 3 from Seattle - Tacoma Intl. to Baltimore Washington Intl. Thurgood Marshall, returning Tue, Sep 9, priced at $202 found 1 day ago
Thu, Aug 28 - Sat, Sep 6
SEA
Seattle - Tacoma Intl.
BWI
Baltimore Washington Intl. Thurgood Marshall
$206 Roundtrip, found 15 hours ago
$206
Roundtrip
found 15 hours ago
Select Alaska Airlines flight, departing Thu, Aug 28 from Seattle - Tacoma Intl. to Baltimore Washington Intl. Thurgood Marshall, returning Sat, Sep 6, priced at $206 found 15 hours ago
Wed, Sep 3 - Wed, Sep 17
SEA
Seattle - Tacoma Intl.
BWI
Baltimore Washington Intl. Thurgood Marshall
$207 Roundtrip, found 6 hours ago
$207
Roundtrip
found 6 hours ago
Select Alaska Airlines flight, departing Wed, Sep 3 from Seattle - Tacoma Intl. to Baltimore Washington Intl. Thurgood Marshall, returning Wed, Sep 17, priced at $207 found 6 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.