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

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Alaska Airlines Flight 378 Route Deals From

The cheapest prices found with in the last 7 days for return flights were $392 and 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, Oct 13 - Wed, Oct 14
SEA
Seattle - Tacoma Intl.
BWI
Baltimore Washington Intl. Thurgood Marshall
$392 Roundtrip, found 3 days ago
$392
Roundtrip
found 3 days ago
Select Alaska Airlines flight, departing Tue, Oct 13 from Seattle - Tacoma Intl. to Baltimore Washington Intl. Thurgood Marshall, returning Wed, Oct 14, priced at $392 found 3 days ago
Tue, Oct 6 - Wed, Oct 7
SEA
Seattle - Tacoma Intl.
BWI
Baltimore Washington Intl. Thurgood Marshall
$397 Roundtrip, just found
$397
Roundtrip
just found
Select Alaska Airlines flight, departing Tue, Oct 6 from Seattle - Tacoma Intl. to Baltimore Washington Intl. Thurgood Marshall, returning Wed, Oct 7, priced at $397 just found
Mon, Dec 14 - Tue, Dec 15
SEA
Seattle - Tacoma Intl.
BWI
Baltimore Washington Intl. Thurgood Marshall
$402 Roundtrip, found 3 days ago
$402
Roundtrip
found 3 days ago
Select Alaska Airlines flight, departing Mon, Dec 14 from Seattle - Tacoma Intl. to Baltimore Washington Intl. Thurgood Marshall, returning Tue, Dec 15, priced at $402 found 3 days ago
Tue, Oct 6 - Wed, Oct 7
SEA
Seattle - Tacoma Intl.
BWI
Baltimore Washington Intl. Thurgood Marshall
$403 Roundtrip, just found
$403
Roundtrip
just found
Select Alaska Airlines flight, departing Tue, Oct 6 from Seattle - Tacoma Intl. to Baltimore Washington Intl. Thurgood Marshall, returning Wed, Oct 7, priced at $403 just found
Wed, Sep 30 - Sat, Oct 17
SEA
Seattle - Tacoma Intl.
BWI
Baltimore Washington Intl. Thurgood Marshall
$406 Roundtrip, found 6 days ago
$406
Roundtrip
found 6 days ago
Select Alaska Airlines flight, departing Wed, Sep 30 from Seattle - Tacoma Intl. to Baltimore Washington Intl. Thurgood Marshall, returning Sat, Oct 17, priced at $406 found 6 days ago
Sat, Nov 14 - Sat, Dec 5
SEA
Seattle - Tacoma Intl.
BWI
Baltimore Washington Intl. Thurgood Marshall
$407 Roundtrip, found 5 days ago
$407
Roundtrip
found 5 days ago
Select Alaska Airlines flight, departing Sat, Nov 14 from Seattle - Tacoma Intl. to Baltimore Washington Intl. Thurgood Marshall, returning Sat, Dec 5, priced at $407 found 5 days ago
Sun, Nov 1 - Sat, Nov 7
SEA
Seattle - Tacoma Intl.
BWI
Baltimore Washington Intl. Thurgood Marshall
$414 Roundtrip, found 3 days ago
$414
Roundtrip
found 3 days ago
Select Alaska Airlines flight, departing Sun, Nov 1 from Seattle - Tacoma Intl. to Baltimore Washington Intl. Thurgood Marshall, returning Sat, Nov 7, priced at $414 found 3 days ago
Wed, Oct 21 - Wed, Oct 28
SEA
Seattle - Tacoma Intl.
BWI
Baltimore Washington Intl. Thurgood Marshall
$415 Roundtrip, found 1 day ago
$415
Roundtrip
found 1 day ago
Select Alaska Airlines flight, departing Wed, Oct 21 from Seattle - Tacoma Intl. to Baltimore Washington Intl. Thurgood Marshall, returning Wed, Oct 28, priced at $415 found 1 day ago
Sun, Nov 15 - Tue, Nov 17
SEA
Seattle - Tacoma Intl.
BWI
Baltimore Washington Intl. Thurgood Marshall
$416 Roundtrip, found 4 days ago
$416
Roundtrip
found 4 days ago
Select Alaska Airlines flight, departing Sun, Nov 15 from Seattle - Tacoma Intl. to Baltimore Washington Intl. Thurgood Marshall, returning Tue, Nov 17, priced at $416 found 4 days ago
Thu, Nov 12 - Sun, Nov 15
SEA
Seattle - Tacoma Intl.
BWI
Baltimore Washington Intl. Thurgood Marshall
$417 Roundtrip, found 10 hours ago
$417
Roundtrip
found 10 hours ago
Select Alaska Airlines flight, departing Thu, Nov 12 from Seattle - Tacoma Intl. to Baltimore Washington Intl. Thurgood Marshall, returning Sun, Nov 15, priced at $417 found 10 hours ago
Sat, Nov 7 - Thu, Nov 12
SEA
Seattle - Tacoma Intl.
BWI
Baltimore Washington Intl. Thurgood Marshall
$419 Roundtrip, found 3 days ago
$419
Roundtrip
found 3 days ago
Select Alaska Airlines flight, departing Sat, Nov 7 from Seattle - Tacoma Intl. to Baltimore Washington Intl. Thurgood Marshall, returning Thu, Nov 12, priced at $419 found 3 days ago
Tue, Oct 13 - Fri, Oct 30
SEA
Seattle - Tacoma Intl.
BWI
Baltimore Washington Intl. Thurgood Marshall
$420 Roundtrip, found 2 days ago
$420
Roundtrip
found 2 days ago
Select Alaska Airlines flight, departing Tue, Oct 13 from Seattle - Tacoma Intl. to Baltimore Washington Intl. Thurgood Marshall, returning Fri, Oct 30, priced at $420 found 2 days ago
Thu, Oct 29 - Mon, Nov 2
SEA
Seattle - Tacoma Intl.
BWI
Baltimore Washington Intl. Thurgood Marshall
$423 Roundtrip, found 1 hour ago
$423
Roundtrip
found 1 hour ago
Select Alaska Airlines flight, departing Thu, Oct 29 from Seattle - Tacoma Intl. to Baltimore Washington Intl. Thurgood Marshall, returning Mon, Nov 2, priced at $423 found 1 hour ago
Tue, Sep 22 - Wed, Sep 30
SEA
Seattle - Tacoma Intl.
BWI
Baltimore Washington Intl. Thurgood Marshall
$425 Roundtrip, found 4 days ago
$425
Roundtrip
found 4 days ago
Select Alaska Airlines flight, departing Tue, Sep 22 from Seattle - Tacoma Intl. to Baltimore Washington Intl. Thurgood Marshall, returning Wed, Sep 30, priced at $425 found 4 days ago
Wed, Sep 30 - Fri, Oct 2
SEA
Seattle - Tacoma Intl.
BWI
Baltimore Washington Intl. Thurgood Marshall
$427 Roundtrip, found 1 day ago
$427
Roundtrip
found 1 day ago
Select Alaska Airlines flight, departing Wed, Sep 30 from Seattle - Tacoma Intl. to Baltimore Washington Intl. Thurgood Marshall, returning Fri, Oct 2, priced at $427 found 1 day ago
Mon, Oct 12 - Tue, Oct 20
SEA
Seattle - Tacoma Intl.
BWI
Baltimore Washington Intl. Thurgood Marshall
$428 Roundtrip, found 6 hours ago
$428
Roundtrip
found 6 hours ago
Select Alaska Airlines flight, departing Mon, Oct 12 from Seattle - Tacoma Intl. to Baltimore Washington Intl. Thurgood Marshall, returning Tue, Oct 20, priced at $428 found 6 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.