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

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Alaska Airlines Flight 642 Route Deals From

The cheapest prices found with in the last 7 days for return flights were $157 and for one-way flights to Denver Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Tue, Nov 4 - Tue, Nov 11
SEA
Seattle - Tacoma Intl.
DEN
Denver Intl.
$157 Roundtrip, found 1 hour ago
$157
Roundtrip
found 1 hour ago
Select Alaska Airlines flight, departing Tue, Nov 4 from Seattle - Tacoma Intl. to Denver Intl., returning Tue, Nov 11, priced at $157 found 1 hour ago
Thu, Nov 6 - Sat, Nov 8
SEA
Seattle - Tacoma Intl.
DEN
Denver Intl.
$165 Roundtrip, found 3 hours ago
$165
Roundtrip
found 3 hours ago
Select Alaska Airlines flight, departing Thu, Nov 6 from Seattle - Tacoma Intl. to Denver Intl., returning Sat, Nov 8, priced at $165 found 3 hours ago
Thu, Sep 25 - Sun, Sep 28
SEA
Seattle - Tacoma Intl.
DEN
Denver Intl.
$173 Roundtrip, found 13 hours ago
$173
Roundtrip
found 13 hours ago
Select Alaska Airlines flight, departing Thu, Sep 25 from Seattle - Tacoma Intl. to Denver Intl., returning Sun, Sep 28, priced at $173 found 13 hours ago
Fri, Sep 19 - Tue, Sep 23
SEA
Seattle - Tacoma Intl.
DEN
Denver Intl.
$177 Roundtrip, found 1 hour ago
$177
Roundtrip
found 1 hour ago
Select Alaska Airlines flight, departing Fri, Sep 19 from Seattle - Tacoma Intl. to Denver Intl., returning Tue, Sep 23, priced at $177 found 1 hour ago
Fri, Sep 12 - Mon, Sep 15
SEA
Seattle - Tacoma Intl.
DEN
Denver Intl.
$185 Roundtrip, found 4 hours ago
$185
Roundtrip
found 4 hours ago
Select Alaska Airlines flight, departing Fri, Sep 12 from Seattle - Tacoma Intl. to Denver Intl., returning Mon, Sep 15, priced at $185 found 4 hours ago
Fri, Sep 19 - Tue, Sep 23
SEA
Seattle - Tacoma Intl.
DEN
Denver Intl.
$187 Roundtrip, found 1 hour ago
$187
Roundtrip
found 1 hour ago
Select Alaska Airlines flight, departing Fri, Sep 19 from Seattle - Tacoma Intl. to Denver Intl., returning Tue, Sep 23, priced at $187 found 1 hour ago
Thu, Sep 25 - Sun, Sep 28
SEA
Seattle - Tacoma Intl.
DEN
Denver Intl.
$195 Roundtrip, found 13 hours ago
$195
Roundtrip
found 13 hours ago
Select Alaska Airlines flight, departing Thu, Sep 25 from Seattle - Tacoma Intl. to Denver Intl., returning Sun, Sep 28, priced at $195 found 13 hours ago
Fri, Sep 19 - Tue, Sep 23
SEA
Seattle - Tacoma Intl.
DEN
Denver Intl.
$197 Roundtrip, found 1 hour ago
$197
Roundtrip
found 1 hour ago
Select Alaska Airlines flight, departing Fri, Sep 19 from Seattle - Tacoma Intl. to Denver Intl., returning Tue, Sep 23, priced at $197 found 1 hour ago
Tue, Oct 7 - Fri, Oct 10
PAE
Seattle Paine Field Intl. Airport
DEN
Denver Intl.
$265 Roundtrip, found 1 hour ago
$265
Roundtrip
found 1 hour ago
Select Alaska Airlines flight, departing Tue, Oct 7 from Seattle Paine Field Intl. Airport to Denver Intl., returning Fri, Oct 10, priced at $265 found 1 hour ago
Tue, Oct 7 - Fri, Oct 10
PAE
Seattle Paine Field Intl. Airport
DEN
Denver Intl.
$271 Roundtrip, found 1 hour ago
$271
Roundtrip
found 1 hour ago
Select Alaska Airlines flight, departing Tue, Oct 7 from Seattle Paine Field Intl. Airport to Denver Intl., returning Fri, Oct 10, priced at $271 found 1 hour ago