Alaska Airlines Flight 642 Deals & Information (2026/2027)

Wander Wisely with exceptional service, 24/7 supportOpens in a new window

Feel at ease with free flight cancellations within 24 hours of booking

Change your flight without a fee on select flights

Alaska Airlines Flight 642 Route Deals From

The cheapest prices found with in the last 7 days for return flights were $76 and for one-way flights to Denver Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Thu, Feb 5 - Mon, Feb 9
SEA
Seattle - Tacoma Intl.
DEN
Denver Intl.
$76 Roundtrip, just found
$76
Roundtrip
just found
Select Alaska Airlines flight, departing Thu, Feb 5 from Seattle - Tacoma Intl. to Denver Intl., returning Mon, Feb 9, priced at $76 just found
Mon, Feb 2 - Thu, Feb 5
SEA
Seattle - Tacoma Intl.
DEN
Denver Intl.
$89 Roundtrip, found 1 hour ago
$89
Roundtrip
found 1 hour ago
Select Alaska Airlines flight, departing Mon, Feb 2 from Seattle - Tacoma Intl. to Denver Intl., returning Thu, Feb 5, priced at $89 found 1 hour ago
Thu, Feb 5 - Mon, Feb 9
SEA
Seattle - Tacoma Intl.
DEN
Denver Intl.
$92 Roundtrip, just found
$92
Roundtrip
just found
Select Alaska Airlines flight, departing Thu, Feb 5 from Seattle - Tacoma Intl. to Denver Intl., returning Mon, Feb 9, priced at $92 just found
Thu, Feb 5 - Mon, Feb 9
SEA
Seattle - Tacoma Intl.
DEN
Denver Intl.
$102 Roundtrip, just found
$102
Roundtrip
just found
Select Alaska Airlines flight, departing Thu, Feb 5 from Seattle - Tacoma Intl. to Denver Intl., returning Mon, Feb 9, priced at $102 just found
Wed, Feb 11 - Mon, Feb 16
SEA
Seattle - Tacoma Intl.
DEN
Denver Intl.
$104 Roundtrip, found 11 hours ago
$104
Roundtrip
found 11 hours ago
Select Alaska Airlines flight, departing Wed, Feb 11 from Seattle - Tacoma Intl. to Denver Intl., returning Mon, Feb 16, priced at $104 found 11 hours ago
Tue, Mar 24 - Mon, Mar 30
SEA
Seattle - Tacoma Intl.
DEN
Denver Intl.
$108 Roundtrip, found 1 day ago
$108
Roundtrip
found 1 day ago
Select Alaska Airlines flight, departing Tue, Mar 24 from Seattle - Tacoma Intl. to Denver Intl., returning Mon, Mar 30, priced at $108 found 1 day ago
Thu, Feb 5 - Mon, Feb 9
SEA
Seattle - Tacoma Intl.
DEN
Denver Intl.
$115 Roundtrip, just found
$115
Roundtrip
just found
Select Alaska Airlines flight, departing Thu, Feb 5 from Seattle - Tacoma Intl. to Denver Intl., returning Mon, Feb 9, priced at $115 just found
Tue, Feb 3 - Tue, Feb 10
SEA
Seattle - Tacoma Intl.
DEN
Denver Intl.
$118 Roundtrip, just found
$118
Roundtrip
just found
Select Alaska Airlines flight, departing Tue, Feb 3 from Seattle - Tacoma Intl. to Denver Intl., returning Tue, Feb 10, priced at $118 just found
Fri, Mar 6 - Mon, Mar 9
SEA
Seattle - Tacoma Intl.
DEN
Denver Intl.
$120 Roundtrip, found 15 hours ago
$120
Roundtrip
found 15 hours ago
Select Alaska Airlines flight, departing Fri, Mar 6 from Seattle - Tacoma Intl. to Denver Intl., returning Mon, Mar 9, priced at $120 found 15 hours ago