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

WestJet, Lufthansa, and KLM are the most popular carriers operating from Seattle/Tacoma Intl to Portugal

What airlines fly to Portugal?

Delta, British Airways and United Airlines are the top three most popular airlines that fly to Portugal from Seattle according to our data. Delta is the first choice among our users, with 32% 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 July 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.

$220 Cheap Flights from Seattle to Portugal in 2026

Discover deals from 900+ travel sites with momondo.

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.

2:35 pm - 12:50 pm

SEA

LIS

14h 15m

1 stop

2:00 pm - 5:00 pm

LIS

SEA

35h 00m

1 stop

$641Icelandair

Wed, Nov 18 - Tue, Dec 1

10:10 am - 10:40 am

SEA

LIS

16h 30m

2 stops

6:10 am - 6:22 pm

LIS

SEA

20h 12m

2 stops

$713Multiple Airlines

Mon, Nov 2 - Tue, Nov 10

3:50 pm - 1:20 pm

SEA

LIS

14h 30m

1 stop

5:00 am - 12:00 pm

LIS

SEA

15h 00m

1 stop

$735Lufthansa

Wed, Oct 28 - Wed, Nov 25

3:15 pm - 10:40 am

SEA

LIS

35h 25m

2 stops

5:00 am - 12:00 pm

LIS

SEA

15h 00m

1 stop

$736Lufthansa

Sun, Nov 8 - Wed, Nov 18

6:45 pm - 5:50 pm

SEA

OPO

15h 05m

1 stop

8:40 pm - 8:15 pm

OPO

SEA

31h 35m

2 stops

$799British Airways

Wed, Nov 18 - Wed, Dec 2

1:30 pm - 5:45 pm

SEA

OPO

20h 15m

1 stop

6:40 pm - 4:50 pm

OPO

SEA

30h 10m

1 stop

$800British Airways

Tue, Nov 17 - Thu, Dec 3

2:35 pm - 1:50 pm

SEA

FAO

15h 15m

1 stop

2:40 pm - 11:50 am

FAO

SEA

29h 10m

1 stop

$888KLM

Wed, Nov 11 - Mon, Nov 30

2:35 pm - 1:50 pm

SEA

FAO

15h 15m

1 stop

2:40 pm - 11:50 am

FAO

SEA

29h 10m

1 stop

$893KLM

Wed, Nov 11 - Mon, Nov 30

1:00 pm - 8:40 am

SEA

PDL

12h 40m

1 stop

11:00 am - 11:36 pm

PDL

SEA

19h 36m

1 stop

$897United Airlines

Mon, Aug 31 - Wed, Sep 16

8:30 am - 12:55 pm

SEA

TER

21h 25m

3 stops

7:10 am - 10:54 am

TER

SEA

58h 44m

2 stops

$1,156United Airlines

Wed, Oct 14 - Sun, Oct 18

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United Airlines flights from Seattle to Portugal

Our best United Airlines deals on Seattle to Portugal flight tickets

United Airlines

Nov 4

SEA7:00 amSeattle/Tacoma Intl

17h 10m

1 stop

LIS8:10 amLisbon Humberto Delgado

Nov 18

LIS5:00 amLisbon Humberto Delgado

15h 00m

1 stop

SEA12:00 pmSeattle/Tacoma Intl

$744

United Airlines

Nov 1

SEA8:10 amSeattle/Tacoma Intl

17h 55m

1 stop

LIS10:05 amLisbon Humberto Delgado

Nov 13

LIS6:10 amLisbon Humberto Delgado

14h 50m

1 stop

SEA1:00 pmSeattle/Tacoma Intl

$746

United Airlines

Jan 12

SEA6:50 amSeattle/Tacoma Intl

17h 20m

1 stop

LIS8:10 amLisbon Humberto Delgado

Jan 21

LIS5:00 amLisbon Humberto Delgado

15h 00m

1 stop

SEA12:00 pmSeattle/Tacoma Intl

$749

Lufthansa flights from Seattle to Portugal

Our best Lufthansa deals on Seattle to Portugal flight tickets

Lufthansa

Oct 28

SEA3:50 pmSeattle/Tacoma Intl

14h 30m

1 stop

LIS1:20 pmLisbon Humberto Delgado

Nov 25

LIS5:00 amLisbon Humberto Delgado

15h 00m

1 stop

SEA12:00 pmSeattle/Tacoma Intl

$731

Lufthansa

Oct 28

SEA3:50 pmSeattle/Tacoma Intl

14h 30m

1 stop

LIS1:20 pmLisbon Humberto Delgado

Nov 25

LIS5:00 amLisbon Humberto Delgado

15h 00m

1 stop

SEA12:00 pmSeattle/Tacoma Intl

$735

Lufthansa

Nov 8

SEA3:15 pmSeattle/Tacoma Intl

35h 25m

2 stops

LIS10:40 amLisbon Humberto Delgado

Nov 18

LIS5:00 amLisbon Humberto Delgado

15h 00m

1 stop

SEA12:00 pmSeattle/Tacoma Intl

$736

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Wed 11/18

2:35 pm-12:50 pm

1 stop14h 15m

Lisbon Humberto Delgado

Tue 12/1

2:00 pm-5:00 pm

1 stop35h 00m

$641

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Mon 11/2

10:10 am-10:40 am

2 stops16h 30m

Lisbon Humberto Delgado

Tue 11/10

6:10 am-6:22 pm

2 stops20h 12m

$713

Quickest round-trip

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Wed 10/28

3:50 pm-1:20 pm

1 stop14h 30m

Lisbon Humberto Delgado

Wed 11/25

5:00 am-12:00 pm

1 stop15h 00m

$735

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Sun 11/8

3:15 pm-10:40 am

2 stops35h 25m

Lisbon Humberto Delgado

Wed 11/18

5:00 am-12:00 pm

1 stop15h 00m

$736

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Wed 11/18

6:45 pm-5:50 pm

1 stop15h 05m

Porto

Wed 12/2

8:40 pm-8:15 pm

2 stops31h 35m

$799

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Tue 11/17

1:30 pm-5:45 pm

1 stop20h 15m

Porto

Thu 12/3

6:40 pm-4:50 pm

1 stop30h 10m

$800

SeattleFaro

SEA - FAO

SEAFAO

Seattle/Tacoma Intl

Wed 11/11

2:35 pm-1:50 pm

1 stop15h 15m

Faro

Mon 11/30

2:40 pm-11:50 am

1 stop29h 10m

$888

SeattleFaro

SEA - FAO

SEAFAO

Seattle/Tacoma Intl

Wed 11/11

2:35 pm-1:50 pm

1 stop15h 15m

Faro

Mon 11/30

2:40 pm-11:50 am

1 stop29h 10m

$893

SeattlePonta Delgada

SEA - PDL

SEAPDL

Seattle/Tacoma Intl

Mon 8/31

1:00 pm-8:40 am

1 stop12h 40m

Ponta Delgada Nordela

Wed 9/16

11:00 am-11:36 pm

1 stop19h 36m

$897

SeattleLajes

SEA - TER

SEATER

Seattle/Tacoma Intl

Wed 10/14

8:30 am-12:55 pm

3 stops21h 25m

Lajes

Sun 10/18

7:10 am-10:54 am

2 stops58h 44m

$1,156

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 $488, 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 February instead. Flights to Portugal in February, while not as cheap as those in January, still average around $571.

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 $839 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 $726 on momondo.

Can stopping save me money on Seattle to Portugal flights?

You could potentially save up to 7% 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	13h 55m
Direct flights	None

The fastest flight from Seattle to Portugal takes 13h 55m

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 July 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 7.0 716 reviews	Search Icelandair flights
Virgin Atlantic	PriceFrom $420	Free Cancellation	Rating 7.5 693 reviews	Search Virgin Atlantic flights
Lufthansa	PriceFrom $475	Free Cancellation	Rating 6.8 8,159 reviews	Search Lufthansa flights
KLM	PriceFrom $481	Free Cancellation	Rating 7.8 1,544 reviews	Search KLM flights
British Airways	PriceFrom $482	Free Cancellation	Rating 6.7 8,127 reviews	Search British Airways flights
United Airlines	PriceFrom $488	Free Cancellation	Rating 7.4 10,024 reviews	Search United Airlines flights
American Airlines	PriceFrom $497	Free Cancellation	Rating 7.1 11,832 reviews	Search American Airlines flights
Air France	PriceFrom $505	Free Cancellation	Rating 7.4 1,628 reviews	Search Air France flights
Aer Lingus	PriceFrom $523	Free Cancellation	Rating 7.3 1,678 reviews	Search Aer Lingus flights
Air Canada	PriceFrom $543	Free Cancellation	Rating 7.1 11,371 reviews	Search Air Canada 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 $472

Flights to Portofrom $537

Flights to Funchalfrom $546

Flights to Farofrom $564

Flights to Ponta Delgadafrom $474

Flights to Lajesfrom $596

Flights to Hortafrom $672

Flights to Pico Islandfrom $687

Flights to Porto Santofrom $746

Flights to Velasfrom $489

Cheap flights from Seattle to Portugal from $220

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 10/18. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

Find the cheapest flights from Seattle to Portugal

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United Airlines flights from Seattle to Portugal

Our best United Airlines deals on Seattle to Portugal flight tickets

Lufthansa flights from Seattle to Portugal

Our best Lufthansa deals on Seattle to Portugal flight tickets

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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

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