
Flights from Seattle to New Castle
Photo by Eric Carter
Cheapest flights from Seattle
These prices were available within the past 7 days. Prices quoted are per person, round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Tue, Sep 23 - Sat, Sep 27
SEA
Seattle - Tacoma Intl.
PHL
Philadelphia Intl.
$277 Roundtrip, found 2 days ago
$277
Roundtrip
found 2 days ago

Thu, Sep 25 - Tue, Sep 30
SEA
Seattle - Tacoma Intl.
PHL
Philadelphia Intl.
$287 Roundtrip, found 2 days ago
$287
Roundtrip
found 2 days ago

Thu, Sep 25 - Tue, Sep 30
SEA
Seattle - Tacoma Intl.
PHL
Philadelphia Intl.
$297 Roundtrip, found 2 days ago
$297
Roundtrip
found 2 days ago

Tue, Sep 23 - Sun, Sep 28
SEA
Seattle - Tacoma Intl.
PHL
Philadelphia Intl.
$297 Roundtrip, found 2 days ago
$297
Roundtrip
found 2 days ago

Thu, Sep 25 - Tue, Sep 30
SEA
Seattle - Tacoma Intl.
PHL
Philadelphia Intl.
$317 Roundtrip, found 2 days ago
$317
Roundtrip
found 2 days ago

Thu, Sep 25 - Tue, Sep 30
SEA
Seattle - Tacoma Intl.
PHL
Philadelphia Intl.
$317 Roundtrip, found 2 days ago
$317
Roundtrip
found 2 days ago

Tue, Jul 29 - Tue, Aug 5
SEA
Seattle - Tacoma Intl.
PHL
Philadelphia Intl.
$318 Roundtrip, found 6 days ago
$318
Roundtrip
found 6 days ago

Thu, Jul 31 - Tue, Aug 5
SEA
Seattle - Tacoma Intl.
PHL
Philadelphia Intl.
$326 Roundtrip, found 6 days ago
$326
Roundtrip
found 6 days ago

Thu, Sep 25 - Tue, Sep 30
SEA
Seattle - Tacoma Intl.
PHL
Philadelphia Intl.
$327 Roundtrip, found 2 days ago
$327
Roundtrip
found 2 days ago

Fri, Jul 25 - Tue, Aug 5
SEA
Seattle - Tacoma Intl.
PHL
Philadelphia Intl.
$331 Roundtrip, found 6 days ago
$331
Roundtrip
found 6 days ago

Thu, Sep 25 - Tue, Sep 30
SEA
Seattle - Tacoma Intl.
PHL
Philadelphia Intl.
$333 Roundtrip, found 2 days ago
$333
Roundtrip
found 2 days ago

Thu, Jul 31 - Mon, Aug 4
SEA
Seattle - Tacoma Intl.
PHL
Philadelphia Intl.
$334 Roundtrip, found 6 days ago
$334
Roundtrip
found 6 days ago

Thu, Sep 25 - Tue, Sep 30
SEA
Seattle - Tacoma Intl.
PHL
Philadelphia Intl.
$337 Roundtrip, found 2 days ago
$337
Roundtrip
found 2 days ago

Mon, Jul 28 - Fri, Aug 1
PAE
Seattle Paine Field Intl. Airport
PHL
Philadelphia Intl.
$339 Roundtrip, found 6 days ago
$339
Roundtrip
found 6 days ago

Thu, Sep 25 - Tue, Sep 30
SEA
Seattle - Tacoma Intl.
PHL
Philadelphia Intl.
$343 Roundtrip, found 2 days ago
$343
Roundtrip
found 2 days ago

Fri, Jul 25 - Fri, Aug 1
PAE
Seattle Paine Field Intl. Airport
PHL
Philadelphia Intl.
$344 Roundtrip, found 6 days ago
$344
Roundtrip
found 6 days ago

Thu, Sep 25 - Tue, Sep 30
SEA
Seattle - Tacoma Intl.
PHL
Philadelphia Intl.
$346 Roundtrip, found 2 days ago
$346
Roundtrip
found 2 days ago

Thu, Sep 25 - Tue, Sep 30
SEA
Seattle - Tacoma Intl.
PHL
Philadelphia Intl.
$352 Roundtrip, found 2 days ago
$352
Roundtrip
found 2 days ago

Thu, Sep 25 - Tue, Sep 30
SEA
Seattle - Tacoma Intl.
PHL
Philadelphia Intl.
$352 Roundtrip, found 2 days ago
$352
Roundtrip
found 2 days ago

Thu, Sep 25 - Tue, Sep 30
SEA
Seattle - Tacoma Intl.
PHL
Philadelphia Intl.
$367 Roundtrip, found 2 days ago
$367
Roundtrip
found 2 days ago