Cheap flights from Seattle to Serra da Estrela

View AU$563 flight on Wed, 20 Aug. 2025Opens in a new window

Popular airlines from Seattle to Serra da Estrela

  • American Airlines

    American Airlines

  • Air Canada

    Air Canada

  • Icelandair

    Icelandair

  • KLM

    KLM

  • Lufthansa

    Lufthansa

  • Turkish Airlines

    Turkish Airlines

  • United

    United

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Cheap Flights from Seattle (SEA) to Serra da Estrela (OPO)

Prices were available within the past 7 days for one-way flights and round trip tickets for the period specified. Prices and availability are subject to change. Additional terms apply.

Icelandair
Wed, 20 Aug. - Sun, 24 Aug.
SEA
Seattle
LIS
Lisbon
AU$794 Return, found 1 day ago
AU$794
Return
found 1 day ago
Select Icelandair flight, departing Wed, 20 Aug. from Seattle to Lisbon, returning Sun, 24 Aug., priced at AU$794 found 1 day ago
Icelandair
Wed, 20 Aug. - Sun, 24 Aug.
SEA
Seattle
LIS
Lisbon
AU$796 Return, found 1 day ago
AU$796
Return
found 1 day ago
Select Icelandair flight, departing Wed, 20 Aug. from Seattle to Lisbon, returning Sun, 24 Aug., priced at AU$796 found 1 day ago
Air Canada
Wed, 20 Aug. - Sun, 24 Aug.
SEA
Seattle
LIS
Lisbon
AU$1,507 Return, found 1 day ago
AU$1,507
Return
found 1 day ago
Select Air Canada flight, departing Wed, 20 Aug. from Seattle to Lisbon, returning Sun, 24 Aug., priced at AU$1,507 found 1 day ago
Lufthansa
Wed, 20 Aug. - Sun, 24 Aug.
SEA
Seattle
LIS
Lisbon
AU$1,517 Return, found 1 day ago
AU$1,517
Return
found 1 day ago
Select Lufthansa flight, departing Wed, 20 Aug. from Seattle to Lisbon, returning Sun, 24 Aug., priced at AU$1,517 found 1 day ago
United
Wed, 20 Aug. - Sun, 24 Aug.
SEA
Seattle
LIS
Lisbon
AU$1,525 Return, found 1 day ago
AU$1,525
Return
found 1 day ago
Select United flight, departing Wed, 20 Aug. from Seattle to Lisbon, returning Sun, 24 Aug., priced at AU$1,525 found 1 day ago
Swiss International Air Lines
Wed, 20 Aug. - Sun, 24 Aug.
SEA
Seattle
LIS
Lisbon
AU$1,556 Return, found 1 day ago
AU$1,556
Return
found 1 day ago
Select Swiss International Air Lines flight, departing Wed, 20 Aug. from Seattle to Lisbon, returning Sun, 24 Aug., priced at AU$1,556 found 1 day ago

Find the cheapest month to fly from Seattle (SEA) to Lisbon (LIS)

February is typically the cheapest month to fly

From AU$723 - AU$1,645 per traveller.

Graph displaying average flight prices per month

*Available to Expedia members.