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

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Alaska Airlines Flight 378 Route Deals From $84

The cheapest prices found with in the last 7 days for return flights were $170 and $84 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, Feb 28 - Tue, Mar 3
SEA
Seattle - Tacoma Intl.
BWI
Baltimore Washington Intl. Thurgood Marshall
$170 Roundtrip, found 1 hour ago
$170
Roundtrip
found 1 hour ago
Select Alaska Airlines flight, departing Sat, Feb 28 from Seattle - Tacoma Intl. to Baltimore Washington Intl. Thurgood Marshall, returning Tue, Mar 3, priced at $170 found 1 hour ago
Wed, Feb 11 - Tue, Feb 17
SEA
Seattle - Tacoma Intl.
BWI
Baltimore Washington Intl. Thurgood Marshall
$174 Roundtrip, found 1 hour ago
$174
Roundtrip
found 1 hour ago
Select Alaska Airlines flight, departing Wed, Feb 11 from Seattle - Tacoma Intl. to Baltimore Washington Intl. Thurgood Marshall, returning Tue, Feb 17, priced at $174 found 1 hour ago
Wed, Apr 1 - Sat, Apr 4
SEA
Seattle - Tacoma Intl.
BWI
Baltimore Washington Intl. Thurgood Marshall
$213 Roundtrip, found 3 hours ago
$213
Roundtrip
found 3 hours ago
Select Alaska Airlines flight, departing Wed, Apr 1 from Seattle - Tacoma Intl. to Baltimore Washington Intl. Thurgood Marshall, returning Sat, Apr 4, priced at $213 found 3 hours ago
Mon, Feb 2 - Tue, Feb 10
SEA
Seattle - Tacoma Intl.
BWI
Baltimore Washington Intl. Thurgood Marshall
$239 Roundtrip, just found
$239
Roundtrip
just found
Select Alaska Airlines flight, departing Mon, Feb 2 from Seattle - Tacoma Intl. to Baltimore Washington Intl. Thurgood Marshall, returning Tue, Feb 10, priced at $239 just found
Mon, Feb 2 - Wed, Feb 4
SEA
Seattle - Tacoma Intl.
BWI
Baltimore Washington Intl. Thurgood Marshall
$240 Roundtrip, just found
$240
Roundtrip
just found
Select Alaska Airlines flight, departing Mon, Feb 2 from Seattle - Tacoma Intl. to Baltimore Washington Intl. Thurgood Marshall, returning Wed, Feb 4, priced at $240 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.