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

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Alaska Airlines Flight 378 Route Deals From $209

The cheapest prices found with in the last 7 days for return flights were $392 and $209 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, Jan 5 - Fri, Jan 8
SEA
Seattle - Tacoma Intl.
BWI
Baltimore Washington Intl. Thurgood Marshall
$392 Roundtrip, found 6 days ago
$392
Roundtrip
found 6 days ago
Select Alaska Airlines flight, departing Tue, Jan 5 from Seattle - Tacoma Intl. to Baltimore Washington Intl. Thurgood Marshall, returning Fri, Jan 8, priced at $392 found 6 days ago
Wed, Feb 10 - Sat, Feb 13
SEA
Seattle - Tacoma Intl.
BWI
Baltimore Washington Intl. Thurgood Marshall
$407 Roundtrip, found 8 hours ago
$407
Roundtrip
found 8 hours ago
Select Alaska Airlines flight, departing Wed, Feb 10 from Seattle - Tacoma Intl. to Baltimore Washington Intl. Thurgood Marshall, returning Sat, Feb 13, priced at $407 found 8 hours ago
Sat, Dec 12 - Tue, Dec 15
SEA
Seattle - Tacoma Intl.
BWI
Baltimore Washington Intl. Thurgood Marshall
$415 Roundtrip, found 7 hours ago
$415
Roundtrip
found 7 hours ago
Select Alaska Airlines flight, departing Sat, Dec 12 from Seattle - Tacoma Intl. to Baltimore Washington Intl. Thurgood Marshall, returning Tue, Dec 15, priced at $415 found 7 hours ago
Fri, Dec 11 - Sat, Dec 12
SEA
Seattle - Tacoma Intl.
BWI
Baltimore Washington Intl. Thurgood Marshall
$419 Roundtrip, found 18 hours ago
$419
Roundtrip
found 18 hours ago
Select Alaska Airlines flight, departing Fri, Dec 11 from Seattle - Tacoma Intl. to Baltimore Washington Intl. Thurgood Marshall, returning Sat, Dec 12, priced at $419 found 18 hours ago
Tue, Jan 5 - Wed, Jan 13
SEA
Seattle - Tacoma Intl.
BWI
Baltimore Washington Intl. Thurgood Marshall
$425 Roundtrip, found 1 hour ago
$425
Roundtrip
found 1 hour ago
Select Alaska Airlines flight, departing Tue, Jan 5 from Seattle - Tacoma Intl. to Baltimore Washington Intl. Thurgood Marshall, returning Wed, Jan 13, priced at $425 found 1 hour ago
Wed, Dec 16 - Fri, Dec 25
SEA
Seattle - Tacoma Intl.
BWI
Baltimore Washington Intl. Thurgood Marshall
$427 Roundtrip, just found
$427
Roundtrip
just found
Select Alaska Airlines flight, departing Wed, Dec 16 from Seattle - Tacoma Intl. to Baltimore Washington Intl. Thurgood Marshall, returning Fri, Dec 25, priced at $427 just found
Thu, Dec 10 - Fri, Dec 11
SEA
Seattle - Tacoma Intl.
BWI
Baltimore Washington Intl. Thurgood Marshall
$429 Roundtrip, found 18 hours ago
$429
Roundtrip
found 18 hours ago
Select Alaska Airlines flight, departing Thu, Dec 10 from Seattle - Tacoma Intl. to Baltimore Washington Intl. Thurgood Marshall, returning Fri, Dec 11, priced at $429 found 18 hours ago
Wed, Dec 30 - Thu, Jan 7
SEA
Seattle - Tacoma Intl.
BWI
Baltimore Washington Intl. Thurgood Marshall
$435 Roundtrip, just found
$435
Roundtrip
just found
Select Alaska Airlines flight, departing Wed, Dec 30 from Seattle - Tacoma Intl. to Baltimore Washington Intl. Thurgood Marshall, returning Thu, Jan 7, priced at $435 just found
Thu, Feb 4 - Mon, Feb 8
SEA
Seattle - Tacoma Intl.
BWI
Baltimore Washington Intl. Thurgood Marshall
$437 Roundtrip, found 3 hours ago
$437
Roundtrip
found 3 hours ago
Select Alaska Airlines flight, departing Thu, Feb 4 from Seattle - Tacoma Intl. to Baltimore Washington Intl. Thurgood Marshall, returning Mon, Feb 8, priced at $437 found 3 hours ago
Sun, Jan 3 - Mon, Jan 11
SEA
Seattle - Tacoma Intl.
BWI
Baltimore Washington Intl. Thurgood Marshall
$445 Roundtrip, just found
$445
Roundtrip
just found
Select Alaska Airlines flight, departing Sun, Jan 3 from Seattle - Tacoma Intl. to Baltimore Washington Intl. Thurgood Marshall, returning Mon, Jan 11, priced at $445 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.