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

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Alaska Airlines Flight 378 Route Deals From $129

The cheapest prices found with in the last 7 days for return flights were $203 and $129 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 7 - Wed, Feb 11
SEA
Seattle - Tacoma Intl.
BWI
Baltimore Washington Intl. Thurgood Marshall
$203 Roundtrip, found 5 days ago
$203
Roundtrip
found 5 days ago
Select Alaska Airlines flight, departing Sat, Feb 7 from Seattle - Tacoma Intl. to Baltimore Washington Intl. Thurgood Marshall, returning Wed, Feb 11, priced at $203 found 5 days ago
Wed, Feb 4 - Fri, Feb 13
SEA
Seattle - Tacoma Intl.
BWI
Baltimore Washington Intl. Thurgood Marshall
$220 Roundtrip, found 6 days ago
$220
Roundtrip
found 6 days ago
Select Alaska Airlines flight, departing Wed, Feb 4 from Seattle - Tacoma Intl. to Baltimore Washington Intl. Thurgood Marshall, returning Fri, Feb 13, priced at $220 found 6 days ago
Wed, Feb 4 - Sun, Feb 8
SEA
Seattle - Tacoma Intl.
BWI
Baltimore Washington Intl. Thurgood Marshall
$221 Roundtrip, found 1 day ago
$221
Roundtrip
found 1 day ago
Select Alaska Airlines flight, departing Wed, Feb 4 from Seattle - Tacoma Intl. to Baltimore Washington Intl. Thurgood Marshall, returning Sun, Feb 8, priced at $221 found 1 day ago
Tue, Jan 13 - Sat, Jan 17
SEA
Seattle - Tacoma Intl.
BWI
Baltimore Washington Intl. Thurgood Marshall
$223 Roundtrip, found 5 days ago
$223
Roundtrip
found 5 days ago
Select Alaska Airlines flight, departing Tue, Jan 13 from Seattle - Tacoma Intl. to Baltimore Washington Intl. Thurgood Marshall, returning Sat, Jan 17, priced at $223 found 5 days ago
Fri, Jan 23 - Sat, Jan 31
SEA
Seattle - Tacoma Intl.
BWI
Baltimore Washington Intl. Thurgood Marshall
$237 Roundtrip, found 5 days ago
$237
Roundtrip
found 5 days ago
Select Alaska Airlines flight, departing Fri, Jan 23 from Seattle - Tacoma Intl. to Baltimore Washington Intl. Thurgood Marshall, returning Sat, Jan 31, priced at $237 found 5 days ago
Tue, Mar 17 - Tue, Mar 24
SEA
Seattle - Tacoma Intl.
BWI
Baltimore Washington Intl. Thurgood Marshall
$257 Roundtrip, found 1 hour ago
$257
Roundtrip
found 1 hour ago
Select Alaska Airlines flight, departing Tue, Mar 17 from Seattle - Tacoma Intl. to Baltimore Washington Intl. Thurgood Marshall, returning Tue, Mar 24, priced at $257 found 1 hour ago
Sat, Feb 21 - Sat, Feb 28
SEA
Seattle - Tacoma Intl.
BWI
Baltimore Washington Intl. Thurgood Marshall
$264 Roundtrip, just found
$264
Roundtrip
just found
Select Alaska Airlines flight, departing Sat, Feb 21 from Seattle - Tacoma Intl. to Baltimore Washington Intl. Thurgood Marshall, returning Sat, Feb 28, priced at $264 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.