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

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Alaska Airlines Flight 521 Route Deals From

The cheapest prices found with in the last 7 days for return flights were $121 and for one-way flights to Sky Harbor Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Wed, Jun 11 - Sat, Jun 14
PAE
Seattle Paine Field Intl. Airport
PHX
Sky Harbor Intl.
$121 Roundtrip, just found
$121
Roundtrip
just found
Select Alaska Airlines flight, departing Wed, Jun 11 from Seattle Paine Field Intl. Airport to Sky Harbor Intl., returning Sat, Jun 14, priced at $121 just found
Sat, Jul 26 - Tue, Jul 29
PAE
Seattle Paine Field Intl. Airport
PHX
Sky Harbor Intl.
$126 Roundtrip, just found
$126
Roundtrip
just found
Select Alaska Airlines flight, departing Sat, Jul 26 from Seattle Paine Field Intl. Airport to Sky Harbor Intl., returning Tue, Jul 29, priced at $126 just found
Wed, Jul 2 - Tue, Jul 8
PAE
Seattle Paine Field Intl. Airport
PHX
Sky Harbor Intl.
$128 Roundtrip, just found
$128
Roundtrip
just found
Select Alaska Airlines flight, departing Wed, Jul 2 from Seattle Paine Field Intl. Airport to Sky Harbor Intl., returning Tue, Jul 8, priced at $128 just found
Fri, Jun 27 - Mon, Jun 30
PAE
Seattle Paine Field Intl. Airport
PHX
Sky Harbor Intl.
$133 Roundtrip, just found
$133
Roundtrip
just found
Select Alaska Airlines flight, departing Fri, Jun 27 from Seattle Paine Field Intl. Airport to Sky Harbor Intl., returning Mon, Jun 30, priced at $133 just found
Thu, Jul 24 - Mon, Jul 28
PAE
Seattle Paine Field Intl. Airport
PHX
Sky Harbor Intl.
$142 Roundtrip, found 2 hours ago
$142
Roundtrip
found 2 hours ago
Select Alaska Airlines flight, departing Thu, Jul 24 from Seattle Paine Field Intl. Airport to Sky Harbor Intl., returning Mon, Jul 28, priced at $142 found 2 hours ago
Sat, May 17 - Mon, Jun 2
PAE
Seattle Paine Field Intl. Airport
PHX
Sky Harbor Intl.
$151 Roundtrip, found 5 days ago
$151
Roundtrip
found 5 days ago
Select Alaska Airlines flight, departing Sat, May 17 from Seattle Paine Field Intl. Airport to Sky Harbor Intl., returning Mon, Jun 2, priced at $151 found 5 days ago
Tue, Oct 14 - Sat, Oct 18
PAE
Seattle Paine Field Intl. Airport
PHX
Sky Harbor Intl.
$155 Roundtrip, just found
$155
Roundtrip
just found
Select Alaska Airlines flight, departing Tue, Oct 14 from Seattle Paine Field Intl. Airport to Sky Harbor Intl., returning Sat, Oct 18, priced at $155 just found
Wed, Jul 2 - Tue, Jul 8
PAE
Seattle Paine Field Intl. Airport
PHX
Sky Harbor Intl.
$158 Roundtrip, just found
$158
Roundtrip
just found
Select Alaska Airlines flight, departing Wed, Jul 2 from Seattle Paine Field Intl. Airport to Sky Harbor Intl., returning Tue, Jul 8, priced at $158 just found
Fri, Jun 6 - Sun, Jun 8
PAE
Seattle Paine Field Intl. Airport
PHX
Sky Harbor Intl.
$159 Roundtrip, just found
$159
Roundtrip
just found
Select Alaska Airlines flight, departing Fri, Jun 6 from Seattle Paine Field Intl. Airport to Sky Harbor Intl., returning Sun, Jun 8, priced at $159 just found
Tue, Jul 8 - Mon, Jul 14
PAE
Seattle Paine Field Intl. Airport
PHX
Sky Harbor Intl.
$159 Roundtrip, found 6 days ago
$159
Roundtrip
found 6 days ago
Select Alaska Airlines flight, departing Tue, Jul 8 from Seattle Paine Field Intl. Airport to Sky Harbor Intl., returning Mon, Jul 14, priced at $159 found 6 days ago
Wed, Jul 2 - Mon, Jul 7
PAE
Seattle Paine Field Intl. Airport
PHX
Sky Harbor Intl.
$160 Roundtrip, found 16 hours ago
$160
Roundtrip
found 16 hours ago
Select Alaska Airlines flight, departing Wed, Jul 2 from Seattle Paine Field Intl. Airport to Sky Harbor Intl., returning Mon, Jul 7, priced at $160 found 16 hours ago