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

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Alaska Airlines Flight 642 Route Deals From $49

The cheapest prices found with in the last 7 days for return flights were $80 and $49 for one-way flights to Denver Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Thu, Jan 8 - Sat, Jan 10
SEA
Seattle - Tacoma Intl.
DEN
Denver Intl.
$80 Roundtrip, just found
$80
Roundtrip
just found
Select Alaska Airlines flight, departing Thu, Jan 8 from Seattle - Tacoma Intl. to Denver Intl., returning Sat, Jan 10, priced at $80 just found
Sat, Jan 10 - Sat, Jan 17
SEA
Seattle - Tacoma Intl.
DEN
Denver Intl.
$85 Roundtrip, found 1 hour ago
$85
Roundtrip
found 1 hour ago
Select Alaska Airlines flight, departing Sat, Jan 10 from Seattle - Tacoma Intl. to Denver Intl., returning Sat, Jan 17, priced at $85 found 1 hour ago
Wed, Feb 4 - Mon, Feb 9
SEA
Seattle - Tacoma Intl.
DEN
Denver Intl.
$85 Roundtrip, found 7 hours ago
$85
Roundtrip
found 7 hours ago
Select Alaska Airlines flight, departing Wed, Feb 4 from Seattle - Tacoma Intl. to Denver Intl., returning Mon, Feb 9, priced at $85 found 7 hours ago
Tue, Jan 6 - Sat, Jan 10
SEA
Seattle - Tacoma Intl.
DEN
Denver Intl.
$89 Roundtrip, found 10 hours ago
$89
Roundtrip
found 10 hours ago
Select Alaska Airlines flight, departing Tue, Jan 6 from Seattle - Tacoma Intl. to Denver Intl., returning Sat, Jan 10, priced at $89 found 10 hours ago
Mon, Jan 5 - Thu, Jan 8
SEA
Seattle - Tacoma Intl.
DEN
Denver Intl.
$95 Roundtrip, found 8 hours ago
$95
Roundtrip
found 8 hours ago
Select Alaska Airlines flight, departing Mon, Jan 5 from Seattle - Tacoma Intl. to Denver Intl., returning Thu, Jan 8, priced at $95 found 8 hours ago
Sat, Jan 31 - Mon, Feb 2
SEA
Seattle - Tacoma Intl.
DEN
Denver Intl.
$97 Roundtrip, found 3 hours ago
$97
Roundtrip
found 3 hours ago
Select Alaska Airlines flight, departing Sat, Jan 31 from Seattle - Tacoma Intl. to Denver Intl., returning Mon, Feb 2, priced at $97 found 3 hours ago
Sat, Feb 7 - Wed, Feb 11
SEA
Seattle - Tacoma Intl.
DEN
Denver Intl.
$98 Roundtrip, found 5 hours ago
$98
Roundtrip
found 5 hours ago
Select Alaska Airlines flight, departing Sat, Feb 7 from Seattle - Tacoma Intl. to Denver Intl., returning Wed, Feb 11, priced at $98 found 5 hours ago
Thu, Jan 8 - Sat, Jan 10
SEA
Seattle - Tacoma Intl.
DEN
Denver Intl.
$100 Roundtrip, just found
$100
Roundtrip
just found
Select Alaska Airlines flight, departing Thu, Jan 8 from Seattle - Tacoma Intl. to Denver Intl., returning Sat, Jan 10, priced at $100 just found
Tue, Jan 6 - Sat, Jan 17
SEA
Seattle - Tacoma Intl.
DEN
Denver Intl.
$100 Roundtrip, found 10 hours ago
$100
Roundtrip
found 10 hours ago
Select Alaska Airlines flight, departing Tue, Jan 6 from Seattle - Tacoma Intl. to Denver Intl., returning Sat, Jan 17, priced at $100 found 10 hours ago
Thu, Mar 12 - Sun, Mar 15
SEA
Seattle - Tacoma Intl.
DEN
Denver Intl.
$102 Roundtrip, found 15 hours ago
$102
Roundtrip
found 15 hours ago
Select Alaska Airlines flight, departing Thu, Mar 12 from Seattle - Tacoma Intl. to Denver Intl., returning Sun, Mar 15, priced at $102 found 15 hours ago