What is the cheapest airline that flies from Seattle/Tacoma Intl to Portugal?

British Airways, WestJet, and Virgin Atlantic are the most popular carriers operating from Seattle/Tacoma Intl to Portugal

What airlines fly to Portugal?

British Airways, Delta and United Airlines are the top three most popular airlines that fly to Portugal from Seattle according to our data. British Airways is the first choice among our users, with 31% of people opting to fly with this airline when traveling to Portugal. Keep in mind that there are 14 different airlines that fly to Portugal on a routine basis, so you have a few additional options to choose from.

When did momondo last update prices for flights from Seattle/Tacoma Intl Airport to Portugal?

Prices for flights from Seattle/Tacoma Intl Airport to Portugal were last updated today.

How many operators does momondo search for flights from Seattle/Tacoma Intl Airport to Portugal?

The number of operators available for flights from Seattle/Tacoma Intl Airport to Portugal is 14 as of May 2026.

How old do you have to be to fly from Seattle/Tacoma Intl Airport to Portugal?

The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Seattle/Tacoma Intl Airport to Portugal.

What documentation or ID do you need to fly to Portugal?

The necessary travel and health documents for your Portugal trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

$300 Cheap Flights from Seattle to Portugal in 2026

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Find the cheapest flights from Seattle to Portugal

Round-trip

One-way

Last minute

Cheap round-trip flights

Enter your travel dates to find the best prices.

7:20 am - 11:05 am

SEA

OPO

19h 45m

2 stops

5:50 pm - 12:18 am

OPO

SEA

38h 28m

2 stops

$749Scandinavian Airlines

Tue, Nov 3 - Thu, Nov 19

3:40 pm - 7:35 am

SEA

OPO

31h 55m

3 stops

7:10 am - 8:40 pm

OPO

SEA

21h 30m

2 stops

$757Multiple Airlines

Tue, Sep 8 - Tue, Sep 22

6:50 pm - 5:50 pm

SEA

OPO

15h 00m

1 stop

8:40 pm - 10:15 pm

OPO

SEA

33h 35m

2 stops

$771British Airways

Wed, Nov 4 - Wed, Nov 18

2:46 pm - 5:50 pm

SEA

OPO

19h 04m

2 stops

8:40 pm - 10:15 pm

OPO

SEA

33h 35m

2 stops

$776British Airways

Wed, Nov 4 - Wed, Nov 18

10:10 am - 11:00 am

SEA

LIS

17h 50m

2 stops

5:00 am - 12:00 pm

LIS

SEA

15h 00m

1 stop

$871Lufthansa

Mon, Oct 26 - Mon, Nov 2

1:50 pm - 8:00 am

SEA

FAO

34h 10m

1 stop

9:45 pm - 4:35 pm

FAO

SEA

26h 50m

1 stop

$971KLM

Mon, Sep 14 - Mon, Sep 21

2:30 pm - 5:25 pm

SEA

FAO

18h 55m

2 stops

9:45 pm - 4:35 pm

FAO

SEA

26h 50m

1 stop

$976KLM

Mon, Sep 14 - Mon, Sep 21

5:13 pm - 9:50 am

SEA

FAO

32h 37m

2 stops

11:40 am - 9:36 am

FAO

SEA

29h 56m

2 stops

$983United Airlines

Tue, Sep 8 - Tue, Sep 15

2:10 pm - 12:55 pm

SEA

FAO

14h 45m

1 stop

3:55 pm - 4:59 pm

FAO

SEA

33h 04m

1 stop

$994Lufthansa

Tue, Sep 15 - Tue, Oct 20

7:00 am - 12:50 pm

SEA

TER

22h 50m

2 stops

7:05 am - 11:44 pm

TER

SEA

47h 39m

2 stops

$3,712United Airlines

Sat, Jul 4 - Sat, Jul 11

KLM flights from Seattle to Portugal

Our best KLM deals on Seattle to Portugal flight tickets

KLM

Nov 5

SEA7:20 amSeattle/Tacoma Intl

16h 40m

1 stop

LIS8:00 amLisbon Humberto Delgado

Nov 19

LIS3:35 pmLisbon Humberto Delgado

28h 12m

1 stop

SEA11:47 amSeattle/Tacoma Intl

$875

KLM

Sep 14

SEA1:50 pmSeattle/Tacoma Intl

34h 10m

1 stop

FAO8:00 amFaro

Sep 21

FAO9:45 pmFaro

26h 50m

1 stop

SEA4:35 pmSeattle/Tacoma Intl

$971

KLM

Sep 14

SEA2:30 pmSeattle/Tacoma Intl

18h 55m

2 stops

FAO5:25 pmFaro

Sep 21

FAO9:45 pmFaro

26h 50m

1 stop

SEA4:35 pmSeattle/Tacoma Intl

$976

Air France flights from Seattle to Portugal

Our best Air France deals on Seattle to Portugal flight tickets

Air France

Oct 13

SEA1:30 pmSeattle/Tacoma Intl

20h 20m

1 stop

LIS5:50 pmLisbon Humberto Delgado

Oct 26

LIS6:30 pmLisbon Humberto Delgado

24h 55m

1 stop

SEA12:25 pmSeattle/Tacoma Intl

$879

Air France

Jun 1

SEA6:50 pmSeattle/Tacoma Intl

19h 35m

1 stop

LIS10:25 pmLisbon Humberto Delgado

Aug 31

LIS6:50 pmLisbon Humberto Delgado

24h 25m

1 stop

SEA11:15 amSeattle/Tacoma Intl

$1,224

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Tue 11/3

7:20 am-11:05 am

2 stops19h 45m

Porto

Thu 11/19

5:50 pm-12:18 am

2 stops38h 28m

$749

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Tue 9/8

3:40 pm-7:35 am

3 stops31h 55m

Porto

Tue 9/22

7:10 am-8:40 pm

2 stops21h 30m

$757

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Wed 11/4

6:50 pm-5:50 pm

1 stop15h 00m

Porto

Wed 11/18

8:40 pm-10:15 pm

2 stops33h 35m

$771

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Wed 11/4

2:46 pm-5:50 pm

2 stops19h 04m

Porto

Wed 11/18

8:40 pm-10:15 pm

2 stops33h 35m

$776

Quickest round-trip

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Mon 10/26

10:10 am-11:00 am

2 stops17h 50m

Lisbon Humberto Delgado

Mon 11/2

5:00 am-12:00 pm

1 stop15h 00m

$871

SeattleFaro

SEA - FAO

SEAFAO

Seattle/Tacoma Intl

Mon 9/14

1:50 pm-8:00 am

1 stop34h 10m

Faro

Mon 9/21

9:45 pm-4:35 pm

1 stop26h 50m

$971

SeattleFaro

SEA - FAO

SEAFAO

Seattle/Tacoma Intl

Mon 9/14

2:30 pm-5:25 pm

2 stops18h 55m

Faro

Mon 9/21

9:45 pm-4:35 pm

1 stop26h 50m

$976

SeattleFaro

SEA - FAO

SEAFAO

Seattle/Tacoma Intl

Tue 9/8

5:13 pm-9:50 am

2 stops32h 37m

Faro

Tue 9/15

11:40 am-9:36 am

2 stops29h 56m

$983

SeattleFaro

SEA - FAO

SEAFAO

Seattle/Tacoma Intl

Tue 9/15

2:10 pm-12:55 pm

1 stop14h 45m

Faro

Tue 10/20

3:55 pm-4:59 pm

1 stop33h 04m

$994

SeattleLajes

SEA - TER

SEATER

Seattle/Tacoma Intl

Sat 7/4

7:00 am-12:50 pm

2 stops22h 50m

Lajes

Sat 7/11

7:05 am-11:44 pm

2 stops47h 39m

$3,712

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from Seattle to Portugal

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

Prices

Airlines

What is the cheapest month to fly to Portugal?

The cheapest month to fly to Portugal from Seattle is in January. Flight prices, which tend to average around $339, are often lower during this time because this is during the off-season. If you aren’t able to travel during the month of January, then book flights to Portugal from Seattle during April instead. Flights to Portugal in April, while not as cheap as those in January, still average around $390.

How far in advance should I book a flight from Seattle to Portugal?

You are more likely to see cheaper flights to Portugal from Seattle when booking weeks ahead of your departure date. In general, you can expect to find flights to Portugal for around $818 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Portugal from Seattle for as low as $721 on momondo.

Can stopping save me money on Seattle to Portugal flights?

You could potentially save up to 28% on your flight if you consider stops on a Seattle to Portugal flight.

Cheap Seattle to Portugal flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Seattle to Portugal

Fastest flight time	14h 10m
Direct flights	None

The fastest flight from Seattle to Portugal takes 14h 10m

There are no direct flights from Seattle to Portugal. There are no popular flight routes from Seattle to Portugal.

Search flight deals

Frequently asked questions about flying from Seattle to Portugal

When did momondo last update prices for flights from Seattle/Tacoma Intl Airport to Portugal?
Prices for flights from Seattle/Tacoma Intl Airport to Portugal were last updated today.
How many operators does momondo search for flights from Seattle/Tacoma Intl Airport to Portugal?
The number of operators available for flights from Seattle/Tacoma Intl Airport to Portugal is 14 as of May 2026.
How old do you have to be to fly from Seattle/Tacoma Intl Airport to Portugal?
The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Seattle/Tacoma Intl Airport to Portugal.
What documentation or ID do you need to fly to Portugal?
The necessary travel and health documents for your Portugal trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

Best airlines flying from Seattle to Portugal

Compare and see reviews for airlines that fly from Seattle to Portugal with momondo

Airline	Rating	Free Cancellation	Price
Icelandair	PriceFrom $348	Free Cancellation	Rating 7.0 658 reviews	Search Icelandair flights
KLM	PriceFrom $481	Free Cancellation	Rating 7.8 1,521 reviews	Search KLM flights
Lufthansa	PriceFrom $482	Free Cancellation	Rating 6.8 8,029 reviews	Search Lufthansa flights
British Airways	PriceFrom $482	Free Cancellation	Rating 6.7 8,005 reviews	Search British Airways flights
United Airlines	PriceFrom $494	Free Cancellation	Rating 7.4 9,751 reviews	Search United Airlines flights
Air France	PriceFrom $505	Free Cancellation	Rating 7.4 1,591 reviews	Search Air France flights
Air Canada	PriceFrom $543	Free Cancellation	Rating 7.1 11,090 reviews	Search Air Canada flights
Delta	PriceFrom $545	Free Cancellation	Rating 7.9 8,429 reviews	Search Delta flights
Aer Lingus	PriceFrom $553	Free Cancellation	Rating 7.3 1,586 reviews	Search Aer Lingus flights
American Airlines	PriceFrom $558	Free Cancellation	Rating 7.1 11,631 reviews	Search American Airlines flights

Why use momondo?

Why should I use momondo to find a flight deal from Seattle to Portugal?

It is quick and easy to find Seattle to Portugal flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Portugal that suits you.

Can I find flights from Seattle to Portugal with flexible booking policies on momondo?

All flight searches from Seattle to Portugal on momondo can be filtered to show those which offer flexible booking policies.

How can momondo help me find flights from Seattle to Portugal?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Seattle to Portugal.

I’m not ready to book a flight from Seattle to Portugal right now. Can momondo alert me if prices change?

If you are simply researching potential flights to Portugal, momondo offers a useful price alert feature which will track prices for flights to Portugal from Seattle and alert you when they change.

An easier way to manage your Portugal trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

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Popular cities

Other flights from Seattle

Other flights to Portugal

Airlines

Cabin classes

Complete your trip

Feeling lucky

Popular cities in Portugal

Flights to Lisbonfrom $473

Flights to Portofrom $569

Flights to Funchalfrom $619

Flights to Farofrom $572

Flights to Ponta Delgadafrom $578

Flights to Lajesfrom $625

Flights to Pico Islandfrom $749

Flights to Hortafrom $666

Flights to Porto Santofrom $545

Flights to Velasfrom $745

Cheap flights from Seattle to Portugal from $300

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Seattle to Portugal departing on 9/25. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

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Big names and deals

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Filter for what you want

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Find the cheapest flights from Seattle to Portugal

Cheap round-trip flights

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Cheap last minute flights

KLM flights from Seattle to Portugal

Our best KLM deals on Seattle to Portugal flight tickets

Air France flights from Seattle to Portugal

Our best Air France deals on Seattle to Portugal flight tickets

momondo Fare Finder

Use the filters below to find and compare flights from Seattle to Portugal that are best for you.

See travel insights to Portugal from

How to get the cheapest flight ticket from Seattle to Portugal

What is the cheapest month to fly to Portugal?

How far in advance should I book a flight from Seattle to Portugal?

Can stopping save me money on Seattle to Portugal flights?

What is the cheapest airline that flies from Seattle/Tacoma Intl to Portugal?

What airlines fly to Portugal?

Cheap Seattle to Portugal flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Seattle to Portugal

Fastest flight time

Direct flights

Frequently asked questions about flying from Seattle to Portugal

Best airlines flying from Seattle to Portugal

Compare and see reviews for airlines that fly from Seattle to Portugal with momondo

Why use momondo?

An easier way to manage your Portugal trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to Portugal

Popular cities in Portugal

Popular flights according to clicks in the last 7 days on momondo

Seattle flight routes

According to popular flight searches on momondo this year

Portugal flight routes

According to popular flight searches on momondo this year

Fly your favorite airline to Portugal

Airlines are sorted and displayed according to clicks in the past 7 days on momondo

Cabin classes currently available on flights to Portugal

List of cabin classes available on flights landing in Portugal. Availability may vary depending on flight origin and airline.

Complete your trip to Portugal

Explore popular destinations other users love

According to popular flight searches on momondo this year