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 $89 and for one-way flights to Denver Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Fri, Dec 5 - Sun, Dec 7
SEA
Seattle - Tacoma Intl.
DEN
Denver Intl.
$89 Roundtrip, just found
$89
Roundtrip
just found
Select Alaska Airlines flight, departing Fri, Dec 5 from Seattle - Tacoma Intl. to Denver Intl., returning Sun, Dec 7, priced at $89 just found
Mon, Dec 15 - Fri, Dec 19
SEA
Seattle - Tacoma Intl.
DEN
Denver Intl.
$90 Roundtrip, found 4 hours ago
$90
Roundtrip
found 4 hours ago
Select Alaska Airlines flight, departing Mon, Dec 15 from Seattle - Tacoma Intl. to Denver Intl., returning Fri, Dec 19, priced at $90 found 4 hours ago
Wed, Jan 7 - Sun, Jan 11
SEA
Seattle - Tacoma Intl.
DEN
Denver Intl.
$93 Roundtrip, just found
$93
Roundtrip
just found
Select Alaska Airlines flight, departing Wed, Jan 7 from Seattle - Tacoma Intl. to Denver Intl., returning Sun, Jan 11, priced at $93 just found
Fri, Dec 12 - Sun, Dec 14
SEA
Seattle - Tacoma Intl.
DEN
Denver Intl.
$99 Roundtrip, found 3 hours ago
$99
Roundtrip
found 3 hours ago
Select Alaska Airlines flight, departing Fri, Dec 12 from Seattle - Tacoma Intl. to Denver Intl., returning Sun, Dec 14, priced at $99 found 3 hours ago
Mon, Dec 15 - Fri, Dec 19
SEA
Seattle - Tacoma Intl.
DEN
Denver Intl.
$100 Roundtrip, found 4 hours ago
$100
Roundtrip
found 4 hours ago
Select Alaska Airlines flight, departing Mon, Dec 15 from Seattle - Tacoma Intl. to Denver Intl., returning Fri, Dec 19, priced at $100 found 4 hours ago
Fri, Dec 12 - Thu, Dec 18
SEA
Seattle - Tacoma Intl.
DEN
Denver Intl.
$103 Roundtrip, found 6 days ago
$103
Roundtrip
found 6 days ago
Select Alaska Airlines flight, departing Fri, Dec 12 from Seattle - Tacoma Intl. to Denver Intl., returning Thu, Dec 18, priced at $103 found 6 days ago
Thu, Feb 5 - Fri, Feb 13
SEA
Seattle - Tacoma Intl.
DEN
Denver Intl.
$108 Roundtrip, just found
$108
Roundtrip
just found
Select Alaska Airlines flight, departing Thu, Feb 5 from Seattle - Tacoma Intl. to Denver Intl., returning Fri, Feb 13, priced at $108 just found
Fri, Dec 5 - Sun, Dec 7
SEA
Seattle - Tacoma Intl.
DEN
Denver Intl.
$109 Roundtrip, just found
$109
Roundtrip
just found
Select Alaska Airlines flight, departing Fri, Dec 5 from Seattle - Tacoma Intl. to Denver Intl., returning Sun, Dec 7, priced at $109 just found
Tue, Dec 2 - Fri, Dec 5
SEA
Seattle - Tacoma Intl.
DEN
Denver Intl.
$110 Roundtrip, found 3 days ago
$110
Roundtrip
found 3 days ago
Select Alaska Airlines flight, departing Tue, Dec 2 from Seattle - Tacoma Intl. to Denver Intl., returning Fri, Dec 5, priced at $110 found 3 days ago
Fri, Dec 5 - Mon, Dec 8
SEA
Seattle - Tacoma Intl.
DEN
Denver Intl.
$115 Roundtrip, found 12 hours ago
$115
Roundtrip
found 12 hours ago
Select Alaska Airlines flight, departing Fri, Dec 5 from Seattle - Tacoma Intl. to Denver Intl., returning Mon, Dec 8, priced at $115 found 12 hours ago