Alaska Airlines Flight 642 Deals & Information (2025/2026)

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Alaska Airlines Flight 642 Route Deals From $46

The cheapest prices found with in the last 7 days for return flights were $79 and $46 for one-way flights to Denver Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Fri, Dec 12 - Sun, Dec 14
SEA
Seattle - Tacoma Intl.
DEN
Denver Intl.
$79 Roundtrip, just found
$79
Roundtrip
just found
Select Alaska Airlines flight, departing Fri, Dec 12 from Seattle - Tacoma Intl. to Denver Intl., returning Sun, Dec 14, priced at $79 just found
Fri, Dec 12 - Sun, Dec 14
SEA
Seattle - Tacoma Intl.
DEN
Denver Intl.
$89 Roundtrip, just found
$89
Roundtrip
just found
Select Alaska Airlines flight, departing Fri, Dec 12 from Seattle - Tacoma Intl. to Denver Intl., returning Sun, Dec 14, priced at $89 just found
Sun, Dec 7 - Tue, Dec 9
SEA
Seattle - Tacoma Intl.
DEN
Denver Intl.
$91 Roundtrip, found 2 hours ago
$91
Roundtrip
found 2 hours ago
Select Alaska Airlines flight, departing Sun, Dec 7 from Seattle - Tacoma Intl. to Denver Intl., returning Tue, Dec 9, priced at $91 found 2 hours ago
Mon, Jan 26 - Thu, Jan 29
SEA
Seattle - Tacoma Intl.
DEN
Denver Intl.
$93 Roundtrip, found 2 hours ago
$93
Roundtrip
found 2 hours ago
Select Alaska Airlines flight, departing Mon, Jan 26 from Seattle - Tacoma Intl. to Denver Intl., returning Thu, Jan 29, priced at $93 found 2 hours ago
Wed, Dec 31 - Fri, Jan 9
SEA
Seattle - Tacoma Intl.
DEN
Denver Intl.
$94 Roundtrip, found 1 day ago
$94
Roundtrip
found 1 day ago
Select Alaska Airlines flight, departing Wed, Dec 31 from Seattle - Tacoma Intl. to Denver Intl., returning Fri, Jan 9, priced at $94 found 1 day ago
Thu, Dec 4 - Mon, Dec 8
SEA
Seattle - Tacoma Intl.
DEN
Denver Intl.
$99 Roundtrip, found 1 hour ago
$99
Roundtrip
found 1 hour ago
Select Alaska Airlines flight, departing Thu, Dec 4 from Seattle - Tacoma Intl. to Denver Intl., returning Mon, Dec 8, priced at $99 found 1 hour ago
Fri, Dec 12 - Thu, Dec 18
SEA
Seattle - Tacoma Intl.
DEN
Denver Intl.
$103 Roundtrip, found 1 day ago
$103
Roundtrip
found 1 day ago
Select Alaska Airlines flight, departing Fri, Dec 12 from Seattle - Tacoma Intl. to Denver Intl., returning Thu, Dec 18, priced at $103 found 1 day ago
Tue, Dec 9 - Mon, Dec 15
SEA
Seattle - Tacoma Intl.
DEN
Denver Intl.
$106 Roundtrip, found 1 day ago
$106
Roundtrip
found 1 day ago
Select Alaska Airlines flight, departing Tue, Dec 9 from Seattle - Tacoma Intl. to Denver Intl., returning Mon, Dec 15, priced at $106 found 1 day ago
Thu, Dec 4 - Mon, Dec 8
SEA
Seattle - Tacoma Intl.
DEN
Denver Intl.
$109 Roundtrip, found 1 hour ago
$109
Roundtrip
found 1 hour ago
Select Alaska Airlines flight, departing Thu, Dec 4 from Seattle - Tacoma Intl. to Denver Intl., returning Mon, Dec 8, priced at $109 found 1 hour ago
Tue, Dec 2 - Sat, Dec 6
SEA
Seattle - Tacoma Intl.
DEN
Denver Intl.
$110 Roundtrip, found 1 day ago
$110
Roundtrip
found 1 day ago
Select Alaska Airlines flight, departing Tue, Dec 2 from Seattle - Tacoma Intl. to Denver Intl., returning Sat, Dec 6, priced at $110 found 1 day ago