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 $407 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.

Wed, Feb 10 - Sat, Feb 13
SEA
Seattle - Tacoma Intl.
BWI
Baltimore Washington Intl. Thurgood Marshall
$407 Roundtrip, found 1 day ago
$407
Roundtrip
found 1 day 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 1 day ago
Tue, Dec 15 - Wed, Dec 16
SEA
Seattle - Tacoma Intl.
BWI
Baltimore Washington Intl. Thurgood Marshall
$412 Roundtrip, found 20 hours ago
$412
Roundtrip
found 20 hours ago
Select Alaska Airlines flight, departing Tue, Dec 15 from Seattle - Tacoma Intl. to Baltimore Washington Intl. Thurgood Marshall, returning Wed, Dec 16, priced at $412 found 20 hours ago
Wed, Feb 10 - Tue, Feb 16
SEA
Seattle - Tacoma Intl.
BWI
Baltimore Washington Intl. Thurgood Marshall
$417 Roundtrip, found 6 hours ago
$417
Roundtrip
found 6 hours ago
Select Alaska Airlines flight, departing Wed, Feb 10 from Seattle - Tacoma Intl. to Baltimore Washington Intl. Thurgood Marshall, returning Tue, Feb 16, priced at $417 found 6 hours ago
Tue, Dec 29 - Tue, Jan 5
SEA
Seattle - Tacoma Intl.
BWI
Baltimore Washington Intl. Thurgood Marshall
$425 Roundtrip, just found
$425
Roundtrip
just found
Select Alaska Airlines flight, departing Tue, Dec 29 from Seattle - Tacoma Intl. to Baltimore Washington Intl. Thurgood Marshall, returning Tue, Jan 5, priced at $425 just found
Fri, Dec 11 - Sat, Dec 12
SEA
Seattle - Tacoma Intl.
BWI
Baltimore Washington Intl. Thurgood Marshall
$429 Roundtrip, found 1 day ago
$429
Roundtrip
found 1 day 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 $429 found 1 day ago
Tue, Jan 5 - Thu, Jan 7
SEA
Seattle - Tacoma Intl.
BWI
Baltimore Washington Intl. Thurgood Marshall
$435 Roundtrip, found 1 hour ago
$435
Roundtrip
found 1 hour ago
Select Alaska Airlines flight, departing Tue, Jan 5 from Seattle - Tacoma Intl. to Baltimore Washington Intl. Thurgood Marshall, returning Thu, Jan 7, priced at $435 found 1 hour ago
Fri, Jan 29 - Sun, Jan 31
SEA
Seattle - Tacoma Intl.
BWI
Baltimore Washington Intl. Thurgood Marshall
$437 Roundtrip, found 7 hours ago
$437
Roundtrip
found 7 hours ago
Select Alaska Airlines flight, departing Fri, Jan 29 from Seattle - Tacoma Intl. to Baltimore Washington Intl. Thurgood Marshall, returning Sun, Jan 31, priced at $437 found 7 hours ago
Sun, Dec 13 - Mon, Dec 14
SEA
Seattle - Tacoma Intl.
BWI
Baltimore Washington Intl. Thurgood Marshall
$440 Roundtrip, found 3 hours ago
$440
Roundtrip
found 3 hours ago
Select Alaska Airlines flight, departing Sun, Dec 13 from Seattle - Tacoma Intl. to Baltimore Washington Intl. Thurgood Marshall, returning Mon, Dec 14, priced at $440 found 3 hours ago
Thu, Dec 31 - Mon, Jan 4
SEA
Seattle - Tacoma Intl.
BWI
Baltimore Washington Intl. Thurgood Marshall
$445 Roundtrip, just found
$445
Roundtrip
just found
Select Alaska Airlines flight, departing Thu, Dec 31 from Seattle - Tacoma Intl. to Baltimore Washington Intl. Thurgood Marshall, returning Mon, Jan 4, priced at $445 just found
Fri, Feb 5 - Sun, Feb 14
SEA
Seattle - Tacoma Intl.
BWI
Baltimore Washington Intl. Thurgood Marshall
$462 Roundtrip, found 12 hours ago
$462
Roundtrip
found 12 hours ago
Select Alaska Airlines flight, departing Fri, Feb 5 from Seattle - Tacoma Intl. to Baltimore Washington Intl. Thurgood Marshall, returning Sun, Feb 14, priced at $462 found 12 hours 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.