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.

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

British Airways, United Airlines, and Lufthansa are the most popular carriers operating from Seattle/Tacoma Intl 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.

$285 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.

3:55 pm - 5:05 pm

SEA

OPO

17h 10m

1 stop

11:50 am - 1:45 pm

OPO

SEA

33h 55m

1 stop

$738Scandinavian Airlines

Sa, Aug 22 - Do, Sep 10

3:40 pm - 5:50 pm

SEA

OPO

18h 10m

2 stops

6:00 pm - 9:40 am

OPO

SEA

47h 40m

3 stops

$740Multiple Airlines

Di, Aug 18 - Mo, Aug 24

7:00 pm - 8:00 am

SEA

OPO

29h 00m

3 stops

6:00 pm - 9:40 am

OPO

SEA

47h 40m

3 stops

$751Multiple Airlines

Di, Aug 18 - Mo, Aug 24

8:20 pm - 11:00 pm

SEA

LIS

18h 40m

1 stop

11:05 am - 10:51 pm

LIS

SEA

18h 46m

1 stop

$868British Airways

Di, Okt 13 - Mi, Okt 28

1:50 pm - 8:00 am

SEA

FAO

34h 10m

1 stop

9:45 pm - 11:47 am

FAO

SEA

22h 02m

1 stop

$971KLM

Mo, Sep 14 - Mo, Sep 21

2:30 pm - 5:25 pm

SEA

FAO

18h 55m

2 stops

9:45 pm - 11:47 am

FAO

SEA

22h 02m

1 stop

$976KLM

Mo, Sep 14 - Mo, Sep 21

4:45 pm - 9:50 am

SEA

FAO

33h 05m

2 stops

11:40 am - 11:36 pm

FAO

SEA

19h 56m

1 stop

$983United Airlines

Di, Sep 8 - Di, Sep 15

7:20 pm - 8:20 am

SEA

PDL

30h 00m

2 stops

9:35 am - 9:07 pm

PDL

SEA

18h 32m

1 stop

$1,080Air Canada

Mo, Jun 29 - Mi, Jul 15

8:20 pm - 12:20 pm

SEA

FNC

32h 00m

1 stop

12:10 pm - 11:35 am

FNC

SEA

31h 25m

1 stop

$1,090British Airways

Do, Jul 23 - Mi, Aug 5

7:30 am - 8:40 am

SEA

PDL

18h 10m

1 stop

11:00 am - 11:44 pm

PDL

SEA

19h 44m

1 stop

$1,096United Airlines

Mo, Jun 29 - Mi, Jul 15

WestJet flights from Seattle to Portugal

Our best WestJet deals on Seattle to Portugal flight tickets

WestJet

Jun 13

SEA10:30 amSeattle/Tacoma Intl

26h 25m

3 stops

LIS8:55 pmLisbon Humberto Delgado

Jun 21

LIS6:10 amLisbon Humberto Delgado

35h 30m

3 stops

SEA9:40 amSeattle/Tacoma Intl

$866

WestJet

Jun 13

SEA7:35 pmSeattle/Tacoma Intl

17h 20m

2 stops

LIS8:55 pmLisbon Humberto Delgado

Jun 20

LIS6:10 amLisbon Humberto Delgado

22h 50m

2 stops

SEA9:00 pmSeattle/Tacoma Intl

$1,200

British Airways flights from Seattle to Portugal

Our best British Airways deals on Seattle to Portugal flight tickets

British Airways

Oct 13

SEA8:20 pmSeattle/Tacoma Intl

18h 40m

1 stop

LIS11:00 pmLisbon Humberto Delgado

Oct 28

LIS11:05 amLisbon Humberto Delgado

18h 46m

1 stop

SEA10:51 pmSeattle/Tacoma Intl

$868

British Airways

Oct 3

SEA8:20 pmSeattle/Tacoma Intl

14h 00m

1 stop

FAO6:20 pmFaro

Oct 24

FAO8:00 pmFaro

29h 55m

1 stop

SEA5:55 pmSeattle/Tacoma Intl

$1,174

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Sa 8/22

3:55 pm-5:05 pm

1 stop17h 10m

Porto

Do 9/10

11:50 am-1:45 pm

1 stop33h 55m

$738

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Di 8/18

3:40 pm-5:50 pm

2 stops18h 10m

Porto

Mo 8/24

6:00 pm-9:40 am

3 stops47h 40m

$740

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Di 8/18

7:00 pm-8:00 am

3 stops29h 00m

Porto

Mo 8/24

6:00 pm-9:40 am

3 stops47h 40m

$751

Quickest round-trip

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Di 10/13

8:20 pm-11:00 pm

1 stop18h 40m

Lisbon Humberto Delgado

Mi 10/28

11:05 am-10:51 pm

1 stop18h 46m

$868

SeattleFaro

SEA - FAO

SEAFAO

Seattle/Tacoma Intl

Mo 9/14

1:50 pm-8:00 am

1 stop34h 10m

Faro

Mo 9/21

9:45 pm-11:47 am

1 stop22h 02m

$971

SeattleFaro

SEA - FAO

SEAFAO

Seattle/Tacoma Intl

Mo 9/14

2:30 pm-5:25 pm

2 stops18h 55m

Faro

Mo 9/21

9:45 pm-11:47 am

1 stop22h 02m

$976

SeattleFaro

SEA - FAO

SEAFAO

Seattle/Tacoma Intl

Di 9/8

4:45 pm-9:50 am

2 stops33h 05m

Faro

Di 9/15

11:40 am-11:36 pm

1 stop19h 56m

$983

SeattlePonta Delgada

SEA - PDL

SEAPDL

Seattle/Tacoma Intl

Mo 6/29

7:20 pm-8:20 am

2 stops30h 00m

Ponta Delgada Nordela

Mi 7/15

9:35 am-9:07 pm

1 stop18h 32m

$1,080

SeattleFunchal

SEA - FNC

SEAFNC

Seattle/Tacoma Intl

Do 7/23

8:20 pm-12:20 pm

1 stop32h 00m

Funchal Madeira

Mi 8/5

12:10 pm-11:35 am

1 stop31h 25m

$1,090

SeattlePonta Delgada

SEA - PDL

SEAPDL

Seattle/Tacoma Intl

Mo 6/29

7:30 am-8:40 am

1 stop18h 10m

Ponta Delgada Nordela

Mi 7/15

11:00 am-11:44 pm

1 stop19h 44m

$1,096

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 32m
Direct flights	None

The fastest flight from Seattle to Portugal takes 14h 32m

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 7.0 663 reviews	Search Icelandair flights
KLM	PriceFrom $481	Free Cancellation	Rating 7.8 1,524 reviews	Search KLM flights
Lufthansa	PriceFrom $482	Free Cancellation	Rating 6.8 8,034 reviews	Search Lufthansa flights
British Airways	PriceFrom $482	Free Cancellation	Rating 6.7 8,014 reviews	Search British Airways flights
United Airlines	PriceFrom $494	Free Cancellation	Rating 7.4 9,769 reviews	Search United Airlines flights
Air France	PriceFrom $505	Free Cancellation	Rating 7.4 1,596 reviews	Search Air France flights
Air Canada	PriceFrom $543	Free Cancellation	Rating 7.1 11,107 reviews	Search Air Canada flights
Delta	PriceFrom $545	Free Cancellation	Rating 7.9 8,406 reviews	Search Delta flights
Aer Lingus	PriceFrom $553	Free Cancellation	Rating 7.3 1,589 reviews	Search Aer Lingus flights
American Airlines	PriceFrom $558	Free Cancellation	Rating 7.1 11,645 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 $553

Flights to Portofrom $555

Flights to Funchalfrom $615

Flights to Farofrom $578

Flights to Ponta Delgadafrom $580

Flights to Lajesfrom $638

Flights to Pico Islandfrom $750

Flights to Hortafrom $727

Flights to Porto Santofrom $546

Flights to Velasfrom $808

Cheap flights from Seattle to Portugal from $285

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 11/14. 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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WestJet flights from Seattle to Portugal

Our best WestJet deals on Seattle to Portugal flight tickets

British Airways flights from Seattle to Portugal

Our best British Airways 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