Flights from Seattle to Casco Bay Islands

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 16 - Tue, Sep 23

SEA

Seattle - Tacoma Intl.

PWM

Portland Intl. Jetport

$239 Roundtrip, found 19 hours ago

$239

Roundtrip

found 19 hours ago

Select Delta flight, departing Tue, Sep 16 from Seattle - Tacoma Intl. to Portland Intl. Jetport, returning Tue, Sep 23, priced at $239 found 19 hours ago

Tue, Sep 16 - Wed, Sep 24

SEA

Seattle - Tacoma Intl.

PWM

Portland Intl. Jetport

$261 Roundtrip, found 19 hours ago

$261

Roundtrip

found 19 hours ago

Select JetBlue Airways flight, departing Tue, Sep 16 from Seattle - Tacoma Intl. to Portland Intl. Jetport, returning Wed, Sep 24, priced at $261 found 19 hours ago

Wed, Sep 17 - Wed, Sep 24

SEA

Seattle - Tacoma Intl.

PWM

Portland Intl. Jetport

$280 Roundtrip, found 19 hours ago

$280

Roundtrip

found 19 hours ago

Select United flight, departing Wed, Sep 17 from Seattle - Tacoma Intl. to Portland Intl. Jetport, returning Wed, Sep 24, priced at $280 found 19 hours ago

Mon, Sep 15 - Tue, Sep 23

SEA

Seattle - Tacoma Intl.

PWM

Portland Intl. Jetport

$285 Roundtrip, found 19 hours ago

$285

Roundtrip

found 19 hours ago

Select JetBlue Airways flight, departing Mon, Sep 15 from Seattle - Tacoma Intl. to Portland Intl. Jetport, returning Tue, Sep 23, priced at $285 found 19 hours ago

Wed, Sep 17 - Wed, Sep 24

SEA

Seattle - Tacoma Intl.

PWM

Portland Intl. Jetport

$295 Roundtrip, found 19 hours ago

$295

Roundtrip

found 19 hours ago

Select United flight, departing Wed, Sep 17 from Seattle - Tacoma Intl. to Portland Intl. Jetport, returning Wed, Sep 24, priced at $295 found 19 hours ago

Wed, Sep 17 - Wed, Sep 24

SEA

Seattle - Tacoma Intl.

PWM

Portland Intl. Jetport

$295 Roundtrip, found 19 hours ago

$295

Roundtrip

found 19 hours ago

Select American Airlines flight, departing Wed, Sep 17 from Seattle - Tacoma Intl. to Portland Intl. Jetport, returning Wed, Sep 24, priced at $295 found 19 hours ago

Wed, Sep 17 - Wed, Sep 24

SEA

Seattle - Tacoma Intl.

PWM

Portland Intl. Jetport

$300 Roundtrip, found 19 hours ago

$300

Roundtrip

found 19 hours ago

Select United flight, departing Wed, Sep 17 from Seattle - Tacoma Intl. to Portland Intl. Jetport, returning Wed, Sep 24, priced at $300 found 19 hours ago

Tue, Sep 16 - Thu, Sep 25

SEA

Seattle - Tacoma Intl.

PWM

Portland Intl. Jetport

$313 Roundtrip, found 19 hours ago

$313

Roundtrip

found 19 hours ago

Select JetBlue Airways flight, departing Tue, Sep 16 from Seattle - Tacoma Intl. to Portland Intl. Jetport, returning Thu, Sep 25, priced at $313 found 19 hours ago

Wed, Sep 17 - Wed, Sep 24

SEA

Seattle - Tacoma Intl.

PWM

Portland Intl. Jetport

$319 Roundtrip, found 19 hours ago

$319

Roundtrip

found 19 hours ago

Select United flight, departing Wed, Sep 17 from Seattle - Tacoma Intl. to Portland Intl. Jetport, returning Wed, Sep 24, priced at $319 found 19 hours ago

Wed, Sep 17 - Wed, Sep 24

SEA

Seattle - Tacoma Intl.

PWM

Portland Intl. Jetport

$328 Roundtrip, found 19 hours ago

$328

Roundtrip

found 19 hours ago

Select United flight, departing Wed, Sep 17 from Seattle - Tacoma Intl. to Portland Intl. Jetport, returning Wed, Sep 24, priced at $328 found 19 hours ago

Wed, Sep 17 - Wed, Sep 24

SEA

Seattle - Tacoma Intl.

PWM

Portland Intl. Jetport

$330 Roundtrip, found 19 hours ago

$330

Roundtrip

found 19 hours ago

Select United flight, departing Wed, Sep 17 from Seattle - Tacoma Intl. to Portland Intl. Jetport, returning Wed, Sep 24, priced at $330 found 19 hours ago

Wed, Sep 17 - Tue, Sep 23

SEA

Seattle - Tacoma Intl.

PWM

Portland Intl. Jetport

$332 Roundtrip, found 19 hours ago

$332

Roundtrip

found 19 hours ago

Select JetBlue Airways flight, departing Wed, Sep 17 from Seattle - Tacoma Intl. to Portland Intl. Jetport, returning Tue, Sep 23, priced at $332 found 19 hours ago

Mon, Sep 15 - Thu, Sep 25

SEA

Seattle - Tacoma Intl.

PWM

Portland Intl. Jetport

$337 Roundtrip, found 19 hours ago

$337

Roundtrip

found 19 hours ago

Select JetBlue Airways flight, departing Mon, Sep 15 from Seattle - Tacoma Intl. to Portland Intl. Jetport, returning Thu, Sep 25, priced at $337 found 19 hours ago

Tue, Aug 12 - Tue, Aug 19

SEA

Seattle - Tacoma Intl.

PWM

Portland Intl. Jetport

$340 Roundtrip, found 4 days ago

$340

Roundtrip

found 4 days ago

Select American Airlines flight, departing Tue, Aug 12 from Seattle - Tacoma Intl. to Portland Intl. Jetport, returning Tue, Aug 19, priced at $340 found 4 days ago

Wed, Sep 17 - Wed, Sep 24

SEA

Seattle - Tacoma Intl.

PWM

Portland Intl. Jetport

$341 Roundtrip, found 19 hours ago

$341

Roundtrip

found 19 hours ago

Select JetBlue Airways flight, departing Wed, Sep 17 from Seattle - Tacoma Intl. to Portland Intl. Jetport, returning Wed, Sep 24, priced at $341 found 19 hours ago

Tue, Sep 16 - Mon, Sep 22

SEA

Seattle - Tacoma Intl.

PWM

Portland Intl. Jetport

$342 Roundtrip, found 19 hours ago

$342

Roundtrip

found 19 hours ago

Select JetBlue Airways flight, departing Tue, Sep 16 from Seattle - Tacoma Intl. to Portland Intl. Jetport, returning Mon, Sep 22, priced at $342 found 19 hours ago

Wed, Sep 17 - Wed, Sep 24

SEA

Seattle - Tacoma Intl.

PWM

Portland Intl. Jetport

$345 Roundtrip, found 19 hours ago

$345

Roundtrip

found 19 hours ago

Select American Airlines flight, departing Wed, Sep 17 from Seattle - Tacoma Intl. to Portland Intl. Jetport, returning Wed, Sep 24, priced at $345 found 19 hours ago

Tue, Aug 12 - Tue, Aug 19

SEA

Seattle - Tacoma Intl.

PWM

Portland Intl. Jetport

$345 Roundtrip, found 4 days ago

$345

Roundtrip

found 4 days ago

Select United flight, departing Tue, Aug 12 from Seattle - Tacoma Intl. to Portland Intl. Jetport, returning Tue, Aug 19, priced at $345 found 4 days ago

Wed, Sep 17 - Wed, Sep 24

SEA

Seattle - Tacoma Intl.

PWM

Portland Intl. Jetport

$350 Roundtrip, found 19 hours ago

$350

Roundtrip

found 19 hours ago

Select American Airlines flight, departing Wed, Sep 17 from Seattle - Tacoma Intl. to Portland Intl. Jetport, returning Wed, Sep 24, priced at $350 found 19 hours ago

Wed, Sep 17 - Wed, Sep 24

SEA

Seattle - Tacoma Intl.

PWM

Portland Intl. Jetport

$462 Roundtrip, found 19 hours ago

$462

Roundtrip

found 19 hours ago

Select Alaska Airlines flight, departing Wed, Sep 17 from Seattle - Tacoma Intl. to Portland Intl. Jetport, returning Wed, Sep 24, priced at $462 found 19 hours ago