Alaska Airlines Flight 378 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 $231 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.

Mon, Sep 29 - Tue, Sep 30
SEA
Seattle - Tacoma Intl.
BWI
Baltimore Washington Intl. Thurgood Marshall
$231 Roundtrip, found 1 day ago
$231
Roundtrip
found 1 day ago
Select Alaska Airlines flight, departing Mon, Sep 29 from Seattle - Tacoma Intl. to Baltimore Washington Intl. Thurgood Marshall, returning Tue, Sep 30, priced at $231 found 1 day ago
Thu, Sep 25 - Mon, Sep 29
SEA
Seattle - Tacoma Intl.
BWI
Baltimore Washington Intl. Thurgood Marshall
$237 Roundtrip, found 19 hours ago
$237
Roundtrip
found 19 hours ago
Select Alaska Airlines flight, departing Thu, Sep 25 from Seattle - Tacoma Intl. to Baltimore Washington Intl. Thurgood Marshall, returning Mon, Sep 29, priced at $237 found 19 hours ago
Wed, Aug 27 - Thu, Sep 4
SEA
Seattle - Tacoma Intl.
BWI
Baltimore Washington Intl. Thurgood Marshall
$241 Roundtrip, found 19 hours ago
$241
Roundtrip
found 19 hours ago
Select Alaska Airlines flight, departing Wed, Aug 27 from Seattle - Tacoma Intl. to Baltimore Washington Intl. Thurgood Marshall, returning Thu, Sep 4, priced at $241 found 19 hours ago
Wed, Oct 1 - Wed, Oct 8
SEA
Seattle - Tacoma Intl.
BWI
Baltimore Washington Intl. Thurgood Marshall
$247 Roundtrip, found 21 hours ago
$247
Roundtrip
found 21 hours ago
Select Alaska Airlines flight, departing Wed, Oct 1 from Seattle - Tacoma Intl. to Baltimore Washington Intl. Thurgood Marshall, returning Wed, Oct 8, priced at $247 found 21 hours ago
Fri, Oct 17 - Wed, Oct 22
SEA
Seattle - Tacoma Intl.
BWI
Baltimore Washington Intl. Thurgood Marshall
$266 Roundtrip, just found
$266
Roundtrip
just found
Select Alaska Airlines flight, departing Fri, Oct 17 from Seattle - Tacoma Intl. to Baltimore Washington Intl. Thurgood Marshall, returning Wed, Oct 22, priced at $266 just found
Tue, Oct 7 - Fri, Oct 10
PAE
Seattle Paine Field Intl. Airport
BWI
Baltimore Washington Intl. Thurgood Marshall
$673 Roundtrip, found 6 days ago
$673
Roundtrip
found 6 days ago
Select Alaska Airlines flight, departing Tue, Oct 7 from Seattle Paine Field Intl. Airport to Baltimore Washington Intl. Thurgood Marshall, returning Fri, Oct 10, priced at $673 found 6 days ago
Tue, Oct 7 - Fri, Oct 10
PAE
Seattle Paine Field Intl. Airport
BWI
Baltimore Washington Intl. Thurgood Marshall
$678 Roundtrip, found 6 days ago
$678
Roundtrip
found 6 days ago
Select Alaska Airlines flight, departing Tue, Oct 7 from Seattle Paine Field Intl. Airport to Baltimore Washington Intl. Thurgood Marshall, returning Fri, Oct 10, priced at $678 found 6 days ago
Fri, Oct 3 - Sun, Oct 5
PAE
Seattle Paine Field Intl. Airport
BWI
Baltimore Washington Intl. Thurgood Marshall
$681 Roundtrip, found 4 days ago
$681
Roundtrip
found 4 days ago
Select Alaska Airlines flight, departing Fri, Oct 3 from Seattle Paine Field Intl. Airport to Baltimore Washington Intl. Thurgood Marshall, returning Sun, Oct 5, priced at $681 found 4 days ago
Tue, Oct 7 - Fri, Oct 10
PAE
Seattle Paine Field Intl. Airport
BWI
Baltimore Washington Intl. Thurgood Marshall
$685 Roundtrip, found 6 days ago
$685
Roundtrip
found 6 days ago
Select Alaska Airlines flight, departing Tue, Oct 7 from Seattle Paine Field Intl. Airport to Baltimore Washington Intl. Thurgood Marshall, returning Fri, Oct 10, priced at $685 found 6 days ago
Tue, Oct 7 - Fri, Oct 10
PAE
Seattle Paine Field Intl. Airport
BWI
Baltimore Washington Intl. Thurgood Marshall
$690 Roundtrip, found 6 days ago
$690
Roundtrip
found 6 days ago
Select Alaska Airlines flight, departing Tue, Oct 7 from Seattle Paine Field Intl. Airport to Baltimore Washington Intl. Thurgood Marshall, returning Fri, Oct 10, priced at $690 found 6 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.