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 $91 and $46 for one-way flights to Denver Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Mon, Dec 8 - Sun, Dec 14
SEA
Seattle - Tacoma Intl.
DEN
Denver Intl.
$91 Roundtrip, found 12 hours ago
$91
Roundtrip
found 12 hours ago
Select Alaska Airlines flight, departing Mon, Dec 8 from Seattle - Tacoma Intl. to Denver Intl., returning Sun, Dec 14, priced at $91 found 12 hours ago
Thu, Dec 4 - Thu, Dec 11
SEA
Seattle - Tacoma Intl.
DEN
Denver Intl.
$99 Roundtrip, found 5 hours ago
$99
Roundtrip
found 5 hours ago
Select Alaska Airlines flight, departing Thu, Dec 4 from Seattle - Tacoma Intl. to Denver Intl., returning Thu, Dec 11, priced at $99 found 5 hours ago
Fri, Dec 12 - Thu, Dec 18
SEA
Seattle - Tacoma Intl.
DEN
Denver Intl.
$103 Roundtrip, found 17 hours ago
$103
Roundtrip
found 17 hours ago
Select Alaska Airlines flight, departing Fri, Dec 12 from Seattle - Tacoma Intl. to Denver Intl., returning Thu, Dec 18, priced at $103 found 17 hours ago
Tue, Dec 9 - Mon, Dec 15
SEA
Seattle - Tacoma Intl.
DEN
Denver Intl.
$106 Roundtrip, found 2 days ago
$106
Roundtrip
found 2 days ago
Select Alaska Airlines flight, departing Tue, Dec 9 from Seattle - Tacoma Intl. to Denver Intl., returning Mon, Dec 15, priced at $106 found 2 days ago
Thu, Dec 4 - Sun, Dec 7
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 Sun, Dec 7, priced at $109 found 1 hour ago
Tue, Dec 2 - Fri, Dec 12
SEA
Seattle - Tacoma Intl.
DEN
Denver Intl.
$110 Roundtrip, found 19 hours ago
$110
Roundtrip
found 19 hours ago
Select Alaska Airlines flight, departing Tue, Dec 2 from Seattle - Tacoma Intl. to Denver Intl., returning Fri, Dec 12, priced at $110 found 19 hours ago
Thu, Dec 11 - Mon, Dec 15
SEA
Seattle - Tacoma Intl.
DEN
Denver Intl.
$112 Roundtrip, found 7 hours ago
$112
Roundtrip
found 7 hours ago
Select Alaska Airlines flight, departing Thu, Dec 11 from Seattle - Tacoma Intl. to Denver Intl., returning Mon, Dec 15, priced at $112 found 7 hours ago
Tue, Dec 2 - Sun, Dec 7
SEA
Seattle - Tacoma Intl.
DEN
Denver Intl.
$115 Roundtrip, found 4 days ago
$115
Roundtrip
found 4 days ago
Select Alaska Airlines flight, departing Tue, Dec 2 from Seattle - Tacoma Intl. to Denver Intl., returning Sun, Dec 7, priced at $115 found 4 days ago
Fri, Jan 30 - Sun, Feb 1
SEA
Seattle - Tacoma Intl.
DEN
Denver Intl.
$117 Roundtrip, just found
$117
Roundtrip
just found
Select Alaska Airlines flight, departing Fri, Jan 30 from Seattle - Tacoma Intl. to Denver Intl., returning Sun, Feb 1, priced at $117 just found