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

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Alaska Airlines Flight 642 Route Deals From $65

The cheapest prices found with in the last 7 days for return flights were $129 and $65 for one-way flights to Denver Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Thu, Aug 21 - Mon, Aug 25
SEA
Seattle - Tacoma Intl.
DEN
Denver Intl.
$129 Roundtrip, just found
$129
Roundtrip
just found
Select Alaska Airlines flight, departing Thu, Aug 21 from Seattle - Tacoma Intl. to Denver Intl., returning Mon, Aug 25, priced at $129 just found
Wed, Oct 15 - Sat, Oct 25
SEA
Seattle - Tacoma Intl.
DEN
Denver Intl.
$131 Roundtrip, just found
$131
Roundtrip
just found
Select Alaska Airlines flight, departing Wed, Oct 15 from Seattle - Tacoma Intl. to Denver Intl., returning Sat, Oct 25, priced at $131 just found
Sat, Sep 13 - Sat, Sep 20
SEA
Seattle - Tacoma Intl.
DEN
Denver Intl.
$133 Roundtrip, found 14 hours ago
$133
Roundtrip
found 14 hours ago
Select Alaska Airlines flight, departing Sat, Sep 13 from Seattle - Tacoma Intl. to Denver Intl., returning Sat, Sep 20, priced at $133 found 14 hours ago
Tue, Aug 5 - Wed, Aug 6
SEA
Seattle - Tacoma Intl.
DEN
Denver Intl.
$135 Roundtrip, just found
$135
Roundtrip
just found
Select Alaska Airlines flight, departing Tue, Aug 5 from Seattle - Tacoma Intl. to Denver Intl., returning Wed, Aug 6, priced at $135 just found
Thu, Sep 25 - Sun, Sep 28
SEA
Seattle - Tacoma Intl.
DEN
Denver Intl.
$144 Roundtrip, found 1 hour ago
$144
Roundtrip
found 1 hour ago
Select Alaska Airlines flight, departing Thu, Sep 25 from Seattle - Tacoma Intl. to Denver Intl., returning Sun, Sep 28, priced at $144 found 1 hour ago
Thu, Sep 4 - Sat, Sep 6
SEA
Seattle - Tacoma Intl.
DEN
Denver Intl.
$148 Roundtrip, just found
$148
Roundtrip
just found
Select Alaska Airlines flight, departing Thu, Sep 4 from Seattle - Tacoma Intl. to Denver Intl., returning Sat, Sep 6, priced at $148 just found
Fri, Nov 7 - Tue, Nov 11
SEA
Seattle - Tacoma Intl.
DEN
Denver Intl.
$148 Roundtrip, found 1 hour ago
$148
Roundtrip
found 1 hour ago
Select Alaska Airlines flight, departing Fri, Nov 7 from Seattle - Tacoma Intl. to Denver Intl., returning Tue, Nov 11, priced at $148 found 1 hour ago
Thu, Sep 4 - Mon, Sep 8
SEA
Seattle - Tacoma Intl.
DEN
Denver Intl.
$151 Roundtrip, found 16 hours ago
$151
Roundtrip
found 16 hours ago
Select Alaska Airlines flight, departing Thu, Sep 4 from Seattle - Tacoma Intl. to Denver Intl., returning Mon, Sep 8, priced at $151 found 16 hours ago
Wed, Oct 15 - Sat, Oct 25
SEA
Seattle - Tacoma Intl.
DEN
Denver Intl.
$153 Roundtrip, just found
$153
Roundtrip
just found
Select Alaska Airlines flight, departing Wed, Oct 15 from Seattle - Tacoma Intl. to Denver Intl., returning Sat, Oct 25, priced at $153 just found
Fri, Sep 12 - Tue, Sep 16
SEA
Seattle - Tacoma Intl.
DEN
Denver Intl.
$158 Roundtrip, found 3 hours ago
$158
Roundtrip
found 3 hours ago
Select Alaska Airlines flight, departing Fri, Sep 12 from Seattle - Tacoma Intl. to Denver Intl., returning Tue, Sep 16, priced at $158 found 3 hours ago