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 6 hours ago
$82
Roundtrip
found 6 hours ago
Select Alaska Airlines flight, departing Tue, Feb 3 from Seattle - Tacoma Intl. to Denver Intl., returning Thu, Feb 12, priced at $82 found 6 hours ago
Sun, Feb 22 - Sat, Feb 28
SEA
Seattle - Tacoma Intl.
DEN
Denver Intl.
$87 Roundtrip, found 22 hours ago
$87
Roundtrip
found 22 hours ago
Select Alaska Airlines flight, departing Sun, Feb 22 from Seattle - Tacoma Intl. to Denver Intl., returning Sat, Feb 28, priced at $87 found 22 hours ago
Tue, Feb 3 - Thu, Feb 12
SEA
Seattle - Tacoma Intl.
DEN
Denver Intl.
$91 Roundtrip, found 6 hours ago
$91
Roundtrip
found 6 hours ago
Select Alaska Airlines flight, departing Tue, Feb 3 from Seattle - Tacoma Intl. to Denver Intl., returning Thu, Feb 12, priced at $91 found 6 hours ago
Thu, Feb 19 - Tue, Feb 24
SEA
Seattle - Tacoma Intl.
DEN
Denver Intl.
$92 Roundtrip, found 15 hours ago
$92
Roundtrip
found 15 hours ago
Select Alaska Airlines flight, departing Thu, Feb 19 from Seattle - Tacoma Intl. to Denver Intl., returning Tue, Feb 24, priced at $92 found 15 hours ago
Mon, Feb 2 - Wed, Feb 4
SEA
Seattle - Tacoma Intl.
DEN
Denver Intl.
$94 Roundtrip, found 7 hours ago
$94
Roundtrip
found 7 hours ago
Select Alaska Airlines flight, departing Mon, Feb 2 from Seattle - Tacoma Intl. to Denver Intl., returning Wed, Feb 4, priced at $94 found 7 hours ago
Fri, Feb 6 - Mon, Feb 9
SEA
Seattle - Tacoma Intl.
DEN
Denver Intl.
$97 Roundtrip, found 2 hours ago
$97
Roundtrip
found 2 hours ago
Select Alaska Airlines flight, departing Fri, Feb 6 from Seattle - Tacoma Intl. to Denver Intl., returning Mon, Feb 9, priced at $97 found 2 hours ago
Thu, Feb 5 - Sun, Feb 8
SEA
Seattle - Tacoma Intl.
DEN
Denver Intl.
$110 Roundtrip, just found
$110
Roundtrip
just found
Select Alaska Airlines flight, departing Thu, Feb 5 from Seattle - Tacoma Intl. to Denver Intl., returning Sun, Feb 8, priced at $110 just found