Alaska Airlines Flight 521 Deals & Information (2025/2026)

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 521 Route Deals From

The cheapest prices found with in the last 7 days for return flights were $118 and for one-way flights to Sky Harbor Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Tue, Aug 12 - Fri, Aug 15
PAE
Seattle Paine Field Intl. Airport
PHX
Sky Harbor Intl.
$118 Roundtrip, found 3 hours ago
$118
Roundtrip
found 3 hours ago
Select Alaska Airlines flight, departing Tue, Aug 12 from Seattle Paine Field Intl. Airport to Sky Harbor Intl., returning Fri, Aug 15, priced at $118 found 3 hours ago
Wed, Aug 13 - Sat, Aug 16
PAE
Seattle Paine Field Intl. Airport
PHX
Sky Harbor Intl.
$119 Roundtrip, found 6 hours ago
$119
Roundtrip
found 6 hours ago
Select Alaska Airlines flight, departing Wed, Aug 13 from Seattle Paine Field Intl. Airport to Sky Harbor Intl., returning Sat, Aug 16, priced at $119 found 6 hours ago
Sat, May 31 - Sat, Jun 7
PAE
Seattle Paine Field Intl. Airport
PHX
Sky Harbor Intl.
$121 Roundtrip, just found
$121
Roundtrip
just found
Select Alaska Airlines flight, departing Sat, May 31 from Seattle Paine Field Intl. Airport to Sky Harbor Intl., returning Sat, Jun 7, priced at $121 just found
Sat, Jul 19 - Wed, Jul 23
PAE
Seattle Paine Field Intl. Airport
PHX
Sky Harbor Intl.
$126 Roundtrip, found 3 hours ago
$126
Roundtrip
found 3 hours ago
Select Alaska Airlines flight, departing Sat, Jul 19 from Seattle Paine Field Intl. Airport to Sky Harbor Intl., returning Wed, Jul 23, priced at $126 found 3 hours ago
Sat, May 31 - Mon, Jun 2
PAE
Seattle Paine Field Intl. Airport
PHX
Sky Harbor Intl.
$128 Roundtrip, found 2 hours ago
$128
Roundtrip
found 2 hours ago
Select Alaska Airlines flight, departing Sat, May 31 from Seattle Paine Field Intl. Airport to Sky Harbor Intl., returning Mon, Jun 2, priced at $128 found 2 hours ago
Fri, Jul 18 - Mon, Jul 21
PAE
Seattle Paine Field Intl. Airport
PHX
Sky Harbor Intl.
$131 Roundtrip, found 6 hours ago
$131
Roundtrip
found 6 hours ago
Select Alaska Airlines flight, departing Fri, Jul 18 from Seattle Paine Field Intl. Airport to Sky Harbor Intl., returning Mon, Jul 21, priced at $131 found 6 hours ago
Tue, Aug 12 - Fri, Aug 15
PAE
Seattle Paine Field Intl. Airport
PHX
Sky Harbor Intl.
$132 Roundtrip, found 3 hours ago
$132
Roundtrip
found 3 hours ago
Select Alaska Airlines flight, departing Tue, Aug 12 from Seattle Paine Field Intl. Airport to Sky Harbor Intl., returning Fri, Aug 15, priced at $132 found 3 hours ago
Wed, Jul 9 - Mon, Jul 14
PAE
Seattle Paine Field Intl. Airport
PHX
Sky Harbor Intl.
$133 Roundtrip, found 5 hours ago
$133
Roundtrip
found 5 hours ago
Select Alaska Airlines flight, departing Wed, Jul 9 from Seattle Paine Field Intl. Airport to Sky Harbor Intl., returning Mon, Jul 14, priced at $133 found 5 hours ago
Fri, Jun 6 - Sat, Jun 7
PAE
Seattle Paine Field Intl. Airport
PHX
Sky Harbor Intl.
$134 Roundtrip, found 10 hours ago
$134
Roundtrip
found 10 hours ago
Select Alaska Airlines flight, departing Fri, Jun 6 from Seattle Paine Field Intl. Airport to Sky Harbor Intl., returning Sat, Jun 7, priced at $134 found 10 hours ago
Mon, Jun 2 - Mon, Jun 9
PAE
Seattle Paine Field Intl. Airport
PHX
Sky Harbor Intl.
$135 Roundtrip, found 3 hours ago
$135
Roundtrip
found 3 hours ago
Select Alaska Airlines flight, departing Mon, Jun 2 from Seattle Paine Field Intl. Airport to Sky Harbor Intl., returning Mon, Jun 9, priced at $135 found 3 hours ago
Fri, Aug 15 - Tue, Aug 19
PAE
Seattle Paine Field Intl. Airport
PHX
Sky Harbor Intl.
$139 Roundtrip, found 5 hours ago
$139
Roundtrip
found 5 hours ago
Select Alaska Airlines flight, departing Fri, Aug 15 from Seattle Paine Field Intl. Airport to Sky Harbor Intl., returning Tue, Aug 19, priced at $139 found 5 hours ago
Fri, Jun 6 - Mon, Jun 9
PAE
Seattle Paine Field Intl. Airport
PHX
Sky Harbor Intl.
$141 Roundtrip, found 3 hours ago
$141
Roundtrip
found 3 hours ago
Select Alaska Airlines flight, departing Fri, Jun 6 from Seattle Paine Field Intl. Airport to Sky Harbor Intl., returning Mon, Jun 9, priced at $141 found 3 hours ago
Fri, Jun 6 - Mon, Jun 9
PAE
Seattle Paine Field Intl. Airport
PHX
Sky Harbor Intl.
$143 Roundtrip, found 3 hours ago
$143
Roundtrip
found 3 hours ago
Select Alaska Airlines flight, departing Fri, Jun 6 from Seattle Paine Field Intl. Airport to Sky Harbor Intl., returning Mon, Jun 9, priced at $143 found 3 hours ago
Mon, Jun 16 - Fri, Jun 20
PAE
Seattle Paine Field Intl. Airport
PHX
Sky Harbor Intl.
$144 Roundtrip, found 11 hours ago
$144
Roundtrip
found 11 hours ago
Select Alaska Airlines flight, departing Mon, Jun 16 from Seattle Paine Field Intl. Airport to Sky Harbor Intl., returning Fri, Jun 20, priced at $144 found 11 hours ago