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

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Alaska Airlines Flight 378 Route Deals From $78

The cheapest prices found with in the last 7 days for return flights were $144 and $78 for one-way flights to Baltimore Washington Intl. Thurgood Marshall for the period specified. Prices and availability are subject to change. Additional terms apply.

Tue, Apr 21 - Wed, Apr 22
SEA
Seattle - Tacoma Intl.
BWI
Baltimore Washington Intl. Thurgood Marshall
$144 Roundtrip, found 6 days ago
$144
Roundtrip
found 6 days ago
Select Alaska Airlines flight, departing Tue, Apr 21 from Seattle - Tacoma Intl. to Baltimore Washington Intl. Thurgood Marshall, returning Wed, Apr 22, priced at $144 found 6 days ago
Fri, Apr 24 - Wed, May 6
SEA
Seattle - Tacoma Intl.
BWI
Baltimore Washington Intl. Thurgood Marshall
$152 Roundtrip, found 6 days ago
$152
Roundtrip
found 6 days ago
Select Alaska Airlines flight, departing Fri, Apr 24 from Seattle - Tacoma Intl. to Baltimore Washington Intl. Thurgood Marshall, returning Wed, May 6, priced at $152 found 6 days ago
Tue, Apr 21 - Wed, Apr 22
SEA
Seattle - Tacoma Intl.
BWI
Baltimore Washington Intl. Thurgood Marshall
$162 Roundtrip, found 6 days ago
$162
Roundtrip
found 6 days ago
Select Alaska Airlines flight, departing Tue, Apr 21 from Seattle - Tacoma Intl. to Baltimore Washington Intl. Thurgood Marshall, returning Wed, Apr 22, priced at $162 found 6 days ago
Tue, Apr 21 - Wed, May 6
SEA
Seattle - Tacoma Intl.
BWI
Baltimore Washington Intl. Thurgood Marshall
$168 Roundtrip, found 5 days ago
$168
Roundtrip
found 5 days ago
Select Alaska Airlines flight, departing Tue, Apr 21 from Seattle - Tacoma Intl. to Baltimore Washington Intl. Thurgood Marshall, returning Wed, May 6, priced at $168 found 5 days ago
Thu, Apr 30 - Wed, May 6
SEA
Seattle - Tacoma Intl.
BWI
Baltimore Washington Intl. Thurgood Marshall
$175 Roundtrip, found 6 days ago
$175
Roundtrip
found 6 days ago
Select Alaska Airlines flight, departing Thu, Apr 30 from Seattle - Tacoma Intl. to Baltimore Washington Intl. Thurgood Marshall, returning Wed, May 6, priced at $175 found 6 days ago
Wed, Apr 22 - Sat, Apr 25
SEA
Seattle - Tacoma Intl.
BWI
Baltimore Washington Intl. Thurgood Marshall
$232 Roundtrip, found 5 days ago
$232
Roundtrip
found 5 days ago
Select Alaska Airlines flight, departing Wed, Apr 22 from Seattle - Tacoma Intl. to Baltimore Washington Intl. Thurgood Marshall, returning Sat, Apr 25, priced at $232 found 5 days ago
Tue, Jun 2 - Wed, Jun 10
SEA
Seattle - Tacoma Intl.
BWI
Baltimore Washington Intl. Thurgood Marshall
$289 Roundtrip, found 18 hours ago
$289
Roundtrip
found 18 hours ago
Select Alaska Airlines flight, departing Tue, Jun 2 from Seattle - Tacoma Intl. to Baltimore Washington Intl. Thurgood Marshall, returning Wed, Jun 10, priced at $289 found 18 hours ago
Tue, Apr 21 - Sat, Apr 25
SEA
Seattle - Tacoma Intl.
BWI
Baltimore Washington Intl. Thurgood Marshall
$317 Roundtrip, found 6 hours ago
$317
Roundtrip
found 6 hours ago
Select Alaska Airlines flight, departing Tue, Apr 21 from Seattle - Tacoma Intl. to Baltimore Washington Intl. Thurgood Marshall, returning Sat, Apr 25, priced at $317 found 6 hours ago
Sun, Sep 20 - Thu, Sep 24
SEA
Seattle - Tacoma Intl.
BWI
Baltimore Washington Intl. Thurgood Marshall
$329 Roundtrip, just found
$329
Roundtrip
just found
Select Alaska Airlines flight, departing Sun, Sep 20 from Seattle - Tacoma Intl. to Baltimore Washington Intl. Thurgood Marshall, returning Thu, Sep 24, priced at $329 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.