Alaska Airlines Flight 645 Deals & Information (2025/2026)

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Alaska Airlines Flight 645 Route Deals From $59

The cheapest prices found with in the last 7 days for return flights were $93 and $59 for one-way flights to Seattle - Tacoma Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Tue, Jan 13 - Sat, Jan 17
PHX
Sky Harbor Intl.
SEA
Seattle - Tacoma Intl.
$93 Roundtrip, found 5 hours ago
$93
Roundtrip
found 5 hours ago
Select Alaska Airlines flight, departing Tue, Jan 13 from Sky Harbor Intl. to Seattle - Tacoma Intl., returning Sat, Jan 17, priced at $93 found 5 hours ago
Sat, Feb 28 - Sun, Mar 1
PHX
Sky Harbor Intl.
SEA
Seattle - Tacoma Intl.
$95 Roundtrip, found 2 days ago
$95
Roundtrip
found 2 days ago
Select Alaska Airlines flight, departing Sat, Feb 28 from Sky Harbor Intl. to Seattle - Tacoma Intl., returning Sun, Mar 1, priced at $95 found 2 days ago
Fri, Feb 13 - Sun, Feb 22
PHX
Sky Harbor Intl.
SEA
Seattle - Tacoma Intl.
$105 Roundtrip, found 4 days ago
$105
Roundtrip
found 4 days ago
Select Alaska Airlines flight, departing Fri, Feb 13 from Sky Harbor Intl. to Seattle - Tacoma Intl., returning Sun, Feb 22, priced at $105 found 4 days ago
Thu, Nov 27 - Fri, Dec 5
PHX
Sky Harbor Intl.
SEA
Seattle - Tacoma Intl.
$107 Roundtrip, found 2 days ago
$107
Roundtrip
found 2 days ago
Select Alaska Airlines flight, departing Thu, Nov 27 from Sky Harbor Intl. to Seattle - Tacoma Intl., returning Fri, Dec 5, priced at $107 found 2 days ago
Thu, Jan 15 - Fri, Jan 16
PHX
Sky Harbor Intl.
SEA
Seattle - Tacoma Intl.
$108 Roundtrip, found 4 days ago
$108
Roundtrip
found 4 days ago
Select Alaska Airlines flight, departing Thu, Jan 15 from Sky Harbor Intl. to Seattle - Tacoma Intl., returning Fri, Jan 16, priced at $108 found 4 days ago
Thu, Dec 25 - Fri, Jan 2
PHX
Sky Harbor Intl.
SEA
Seattle - Tacoma Intl.
$115 Roundtrip, found 1 day ago
$115
Roundtrip
found 1 day ago
Select Alaska Airlines flight, departing Thu, Dec 25 from Sky Harbor Intl. to Seattle - Tacoma Intl., returning Fri, Jan 2, priced at $115 found 1 day ago