Alaska Airlines Flight 642 Deals & Information (2026/2027)

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Alaska Airlines Flight 642 Route Deals From $47

The cheapest prices found with in the last 7 days for return flights were $82 and $47 for one-way flights to Denver Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Tue, Feb 3 - Thu, Feb 12
SEA
Seattle - Tacoma Intl.
DEN
Denver Intl.
$82 Roundtrip, found 1 day ago
$82
Roundtrip
found 1 day ago
Select Alaska Airlines flight, departing Tue, Feb 3 from Seattle - Tacoma Intl. to Denver Intl., returning Thu, Feb 12, priced at $82 found 1 day ago
Thu, Mar 5 - Mon, Mar 9
SEA
Seattle - Tacoma Intl.
DEN
Denver Intl.
$90 Roundtrip, just found
$90
Roundtrip
just found
Select Alaska Airlines flight, departing Thu, Mar 5 from Seattle - Tacoma Intl. to Denver Intl., returning Mon, Mar 9, priced at $90 just found
Tue, Feb 3 - Thu, Feb 12
SEA
Seattle - Tacoma Intl.
DEN
Denver Intl.
$91 Roundtrip, found 1 day ago
$91
Roundtrip
found 1 day ago
Select Alaska Airlines flight, departing Tue, Feb 3 from Seattle - Tacoma Intl. to Denver Intl., returning Thu, Feb 12, priced at $91 found 1 day ago
Thu, Feb 19 - Tue, Feb 24
SEA
Seattle - Tacoma Intl.
DEN
Denver Intl.
$92 Roundtrip, found 1 day ago
$92
Roundtrip
found 1 day ago
Select Alaska Airlines flight, departing Thu, Feb 19 from Seattle - Tacoma Intl. to Denver Intl., returning Tue, Feb 24, priced at $92 found 1 day ago
Mon, Feb 2 - Wed, Feb 4
SEA
Seattle - Tacoma Intl.
DEN
Denver Intl.
$94 Roundtrip, found 2 days ago
$94
Roundtrip
found 2 days ago
Select Alaska Airlines flight, departing Mon, Feb 2 from Seattle - Tacoma Intl. to Denver Intl., returning Wed, Feb 4, priced at $94 found 2 days ago
Tue, Feb 3 - Sat, Feb 28
SEA
Seattle - Tacoma Intl.
DEN
Denver Intl.
$108 Roundtrip, found 10 hours ago
$108
Roundtrip
found 10 hours ago
Select Alaska Airlines flight, departing Tue, Feb 3 from Seattle - Tacoma Intl. to Denver Intl., returning Sat, Feb 28, priced at $108 found 10 hours ago
Wed, Feb 11 - Sun, Feb 15
SEA
Seattle - Tacoma Intl.
DEN
Denver Intl.
$109 Roundtrip, found 1 day ago
$109
Roundtrip
found 1 day ago
Select Alaska Airlines flight, departing Wed, Feb 11 from Seattle - Tacoma Intl. to Denver Intl., returning Sun, Feb 15, priced at $109 found 1 day ago
Sat, Feb 21 - Sat, Feb 28
SEA
Seattle - Tacoma Intl.
DEN
Denver Intl.
$110 Roundtrip, found 2 hours ago
$110
Roundtrip
found 2 hours ago
Select Alaska Airlines flight, departing Sat, Feb 21 from Seattle - Tacoma Intl. to Denver Intl., returning Sat, Feb 28, priced at $110 found 2 hours ago
Wed, Feb 4 - Mon, Feb 9
SEA
Seattle - Tacoma Intl.
DEN
Denver Intl.
$113 Roundtrip, found 20 hours ago
$113
Roundtrip
found 20 hours ago
Select Alaska Airlines flight, departing Wed, Feb 4 from Seattle - Tacoma Intl. to Denver Intl., returning Mon, Feb 9, priced at $113 found 20 hours ago
Wed, Apr 1 - Mon, Apr 6
SEA
Seattle - Tacoma Intl.
DEN
Denver Intl.
$118 Roundtrip, found 1 hour ago
$118
Roundtrip
found 1 hour ago
Select Alaska Airlines flight, departing Wed, Apr 1 from Seattle - Tacoma Intl. to Denver Intl., returning Mon, Apr 6, priced at $118 found 1 hour ago