Flights from Seattle to Williamstown

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.

Thu, Oct 2 - Wed, Oct 8

SEA

Seattle - Tacoma Intl.

PHL

Philadelphia Intl.

$264 Roundtrip, found 18 hours ago

$264

Roundtrip

found 18 hours ago

Select Frontier Airlines flight, departing Thu, Oct 2 from Seattle - Tacoma Intl. to Philadelphia Intl., returning Wed, Oct 8, priced at $264 found 18 hours ago

Wed, Oct 29 - Wed, Oct 29

SEA

Seattle - Tacoma Intl.

PHL

Philadelphia Intl.

$271 Roundtrip, found 5 days ago

$271

Roundtrip

found 5 days ago

Select Delta flight, departing Wed, Oct 29 from Seattle - Tacoma Intl. to Philadelphia Intl., returning Wed, Oct 29, priced at $271 found 5 days ago

Tue, Oct 28 - Tue, Nov 4

SEA

Seattle - Tacoma Intl.

PHL

Philadelphia Intl.

$277 Roundtrip, found 5 days ago

$277

Roundtrip

found 5 days ago

Select Delta flight, departing Tue, Oct 28 from Seattle - Tacoma Intl. to Philadelphia Intl., returning Tue, Nov 4, priced at $277 found 5 days ago

Sun, Oct 26 - Sat, Nov 1

SEA

Seattle - Tacoma Intl.

PHL

Philadelphia Intl.

$277 Roundtrip, found 5 days ago

$277

Roundtrip

found 5 days ago

Select Alaska Airlines flight, departing Sun, Oct 26 from Seattle - Tacoma Intl. to Philadelphia Intl., returning Sat, Nov 1, priced at $277 found 5 days ago

Sat, Nov 1 - Tue, Nov 4

SEA

Seattle - Tacoma Intl.

PHL

Philadelphia Intl.

$277 Roundtrip, found 5 days ago

$277

Roundtrip

found 5 days ago

Select Hawaiian Airlines flight, departing Sat, Nov 1 from Seattle - Tacoma Intl. to Philadelphia Intl., returning Tue, Nov 4, priced at $277 found 5 days ago

Thu, Oct 2 - Wed, Oct 8

SEA

Seattle - Tacoma Intl.

PHL

Philadelphia Intl.

$277 Roundtrip, found 18 hours ago

$277

Roundtrip

found 18 hours ago

Select American Airlines flight, departing Thu, Oct 2 from Seattle - Tacoma Intl. to Philadelphia Intl., returning Wed, Oct 8, priced at $277 found 18 hours ago

Thu, Oct 2 - Wed, Oct 8

SEA

Seattle - Tacoma Intl.

PHL

Philadelphia Intl.

$282 Roundtrip, found 18 hours ago

$282

Roundtrip

found 18 hours ago

Select United flight, departing Thu, Oct 2 from Seattle - Tacoma Intl. to Philadelphia Intl., returning Wed, Oct 8, priced at $282 found 18 hours ago

Wed, Oct 29 - Sat, Nov 1

SEA

Seattle - Tacoma Intl.

PHL

Philadelphia Intl.

$287 Roundtrip, found 5 days ago

$287

Roundtrip

found 5 days ago

Select United flight, departing Wed, Oct 29 from Seattle - Tacoma Intl. to Philadelphia Intl., returning Sat, Nov 1, priced at $287 found 5 days ago

Thu, Oct 2 - Wed, Oct 8

SEA

Seattle - Tacoma Intl.

PHL

Philadelphia Intl.

$292 Roundtrip, found 18 hours ago

$292

Roundtrip

found 18 hours ago

Select United flight, departing Thu, Oct 2 from Seattle - Tacoma Intl. to Philadelphia Intl., returning Wed, Oct 8, priced at $292 found 18 hours ago

Thu, Oct 2 - Wed, Oct 8

SEA

Seattle - Tacoma Intl.

PHL

Philadelphia Intl.

$297 Roundtrip, found 18 hours ago

$297

Roundtrip

found 18 hours ago

Select Delta flight, departing Thu, Oct 2 from Seattle - Tacoma Intl. to Philadelphia Intl., returning Wed, Oct 8, priced at $297 found 18 hours ago

Thu, Oct 2 - Wed, Oct 8

SEA

Seattle - Tacoma Intl.

PHL

Philadelphia Intl.

$297 Roundtrip, found 18 hours ago

$297

Roundtrip

found 18 hours ago

Select American Airlines flight, departing Thu, Oct 2 from Seattle - Tacoma Intl. to Philadelphia Intl., returning Wed, Oct 8, priced at $297 found 18 hours ago

Thu, Oct 2 - Wed, Oct 8

SEA

Seattle - Tacoma Intl.

PHL

Philadelphia Intl.

$304 Roundtrip, found 18 hours ago

$304

Roundtrip

found 18 hours ago

Select Frontier Airlines flight, departing Thu, Oct 2 from Seattle - Tacoma Intl. to Philadelphia Intl., returning Wed, Oct 8, priced at $304 found 18 hours ago

Thu, Oct 2 - Wed, Oct 8

SEA

Seattle - Tacoma Intl.

PHL

Philadelphia Intl.

$307 Roundtrip, found 18 hours ago

$307

Roundtrip

found 18 hours ago

Select Frontier Airlines flight, departing Thu, Oct 2 from Seattle - Tacoma Intl. to Philadelphia Intl., returning Wed, Oct 8, priced at $307 found 18 hours ago

Wed, Oct 29 - Sat, Nov 1

SEA

Seattle - Tacoma Intl.

PHL

Philadelphia Intl.

$307 Roundtrip, found 5 days ago

$307

Roundtrip

found 5 days ago

Select American Airlines flight, departing Wed, Oct 29 from Seattle - Tacoma Intl. to Philadelphia Intl., returning Sat, Nov 1, priced at $307 found 5 days ago

Wed, Oct 29 - Sat, Nov 1

SEA

Seattle - Tacoma Intl.

PHL

Philadelphia Intl.

$311 Roundtrip, found 5 days ago

$311

Roundtrip

found 5 days ago

Select United flight, departing Wed, Oct 29 from Seattle - Tacoma Intl. to Philadelphia Intl., returning Sat, Nov 1, priced at $311 found 5 days ago

Wed, Oct 29 - Sat, Nov 1

SEA

Seattle - Tacoma Intl.

PHL

Philadelphia Intl.

$312 Roundtrip, found 5 days ago

$312

Roundtrip

found 5 days ago

Select United flight, departing Wed, Oct 29 from Seattle - Tacoma Intl. to Philadelphia Intl., returning Sat, Nov 1, priced at $312 found 5 days ago

Wed, Oct 29 - Sat, Nov 1

SEA

Seattle - Tacoma Intl.

PHL

Philadelphia Intl.

$317 Roundtrip, found 5 days ago

$317

Roundtrip

found 5 days ago

Select United flight, departing Wed, Oct 29 from Seattle - Tacoma Intl. to Philadelphia Intl., returning Sat, Nov 1, priced at $317 found 5 days ago

Thu, Oct 2 - Wed, Oct 8

SEA

Seattle - Tacoma Intl.

PHL

Philadelphia Intl.

$322 Roundtrip, found 18 hours ago

$322

Roundtrip

found 18 hours ago

Select American Airlines flight, departing Thu, Oct 2 from Seattle - Tacoma Intl. to Philadelphia Intl., returning Wed, Oct 8, priced at $322 found 18 hours ago

Wed, Oct 29 - Sat, Nov 1

SEA

Seattle - Tacoma Intl.

PHL

Philadelphia Intl.

$324 Roundtrip, found 5 days ago

$324

Roundtrip

found 5 days ago

Select Frontier Airlines flight, departing Wed, Oct 29 from Seattle - Tacoma Intl. to Philadelphia Intl., returning Sat, Nov 1, priced at $324 found 5 days ago

Mon, Aug 18 - Tue, Aug 19

SEA

Seattle - Tacoma Intl.

PHL

Philadelphia Intl.

$731 Roundtrip, found 5 days ago

$731

Roundtrip

found 5 days ago

Select JetBlue Airways flight, departing Mon, Aug 18 from Seattle - Tacoma Intl. to Philadelphia Intl., returning Tue, Aug 19, priced at $731 found 5 days ago