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

Delta, Air Canada, and Lufthansa 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 35% of people opting to fly with this airline when traveling to Portugal. Keep in mind that there are 12 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 12 as of August 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.

$256 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.

7:10 pm - 7:55 pmSEA Seattle/Tacoma Intl-FAO Faro

16h 45m1 stop Dublin

9:05 am - 11:44 amFAO Faro-SEA Seattle/Tacoma Intl

34h 39m2 stops Dublin Chicago O'Hare Intl

$711Multiple Airlines

Mon, Oct 12 - Wed, Oct 21

7:10 pm - 7:55 pmSEA Seattle/Tacoma Intl-FAO Faro

16h 45m1 stop Dublin

7:50 am - 9:42 amFAO Faro-SEA Seattle/Tacoma Intl

33h 52m2 stops Dublin Chicago O'Hare Intl

$716Multiple Airlines

Mon, Oct 12 - Mon, Oct 19

2:35 pm - 12:50 pmSEA Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado

14h 15m1 stop Reykjavik Keflavik Intl

2:00 pm - 5:00 pmLIS Lisbon Humberto Delgado-SEA Seattle/Tacoma Intl

35h 00m1 stop Reykjavik Keflavik Intl

$733Icelandair

Wed, Jan 20 - Thu, Feb 4

3:15 pm - 10:40 amSEA Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado

35h 25m2 stops Vancouver Intl Montreal Pierre Elliott Trudeau Intl

5:00 am - 12:00 pmLIS Lisbon Humberto Delgado-SEA Seattle/Tacoma Intl

15h 00m1 stop Frankfurt am Main

$736Lufthansa

Sun, Nov 8 - Wed, Nov 18

8:25 am - 10:30 amSEA Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado

18h 05m1 stop Washington, D.C. Dulles Intl

5:00 am - 12:00 pmLIS Lisbon Humberto Delgado-SEA Seattle/Tacoma Intl

15h 00m1 stop Frankfurt am Main

$741United Airlines

Mon, Oct 19 - Wed, Nov 4

3:15 pm - 9:20 amSEA Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado

34h 05m2 stops Vancouver Intl Toronto Pearson Intl

5:00 am - 6:22 pmLIS Lisbon Humberto Delgado-SEA Seattle/Tacoma Intl

21h 22m2 stops Frankfurt am Main Vancouver Intl

$741Lufthansa

Sat, Feb 13 - Tue, Feb 23

8:09 am - 10:05 amSEA Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado

17h 56m1 stop Washington, D.C. Dulles Intl

5:00 am - 12:00 pmLIS Lisbon Humberto Delgado-SEA Seattle/Tacoma Intl

15h 00m1 stop Frankfurt am Main

$745United Airlines

Sun, Nov 8 - Wed, Nov 18

7:05 pm - 9:20 amSEA Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado

30h 15m2 stops Vancouver Intl Toronto Pearson Intl

5:00 am - 9:57 pmLIS Lisbon Humberto Delgado-SEA Seattle/Tacoma Intl

24h 57m2 stops Frankfurt am Main Vancouver Intl

$748Air Canada

Sun, Nov 8 - Wed, Nov 18

8:40 am - 8:55 amSEA Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado

16h 15m2 stops Vancouver Intl Toronto Pearson Intl

5:00 am - 9:57 pmLIS Lisbon Humberto Delgado-SEA Seattle/Tacoma Intl

24h 57m2 stops Frankfurt am Main Vancouver Intl

$748Air Canada

Wed, Nov 4 - Wed, Nov 18

3:40 pm - 1:50 pmSEA Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado

14h 10m1 stop Reykjavik Keflavik Intl

3:00 pm - 8:40 pmLIS Lisbon Humberto Delgado-SEA Seattle/Tacoma Intl

13h 40m1 stop Reykjavik Keflavik Intl

$755Icelandair

Mon, Sep 28 - Tue, Oct 20

Cheap last minute flights

Enter your travel dates to find the best prices.

3:40 pm - 10:55 amSEA Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado

35h 15m3 stops Reykjavik Keflavik Intl Stockholm Arlanda Amsterdam Schiphol

7:45 pm - 8:40 pmLIS Lisbon Humberto Delgado-SEA Seattle/Tacoma Intl

32h 55m3 stops Amsterdam Schiphol Stockholm Arlanda Reykjavik Keflavik Intl

$987Multiple Airlines

Thu, Aug 27 - Thu, Sep 3

7:00 pm - 10:10 amSEA Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado

31h 10m3 stops Reykjavik Keflavik Intl Kastrup Copenhagen Oslo Gardermoen

7:00 am - 9:40 amLIS Lisbon Humberto Delgado-SEA Seattle/Tacoma Intl

34h 40m3 stops Madrid Barajas Halifax Intl Calgary

$998Multiple Airlines

Thu, Aug 27 - Thu, Sep 3

3:40 pm - 9:35 pmSEA Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado

21h 55m2 stops Reykjavik Keflavik Intl Dublin

9:15 pm - 5:55 pmLIS Lisbon Humberto Delgado-SEA Seattle/Tacoma Intl

28h 40m3 stops Barcelona-El Prat Dublin Reykjavik Keflavik Intl

$1,008Multiple Airlines

Fri, Aug 28 - Thu, Sep 3

7:00 pm - 10:10 amSEA Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado

31h 10m3 stops Reykjavik Keflavik Intl Kastrup Copenhagen Oslo Gardermoen

6:25 pm - 6:45 pmLIS Lisbon Humberto Delgado-SEA Seattle/Tacoma Intl

32h 20m2 stops Montreal Pierre Elliott Trudeau Intl Calgary

$1,114Multiple Airlines

Thu, Aug 27 - Thu, Sep 3

1:30 pm - 2:55 pmSEA Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado

17h 25m1 stop Paris Charles de Gaulle

11:55 am - 4:35 pmLIS Lisbon Humberto Delgado-SEA Seattle/Tacoma Intl

36h 40m1 stop Amsterdam Schiphol

$1,217Delta

Sun, Aug 30 - Mon, Sep 7

7:15 am - 11:15 amSEA Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado

20h 00m2 stops Chicago O'Hare Intl Paris Charles de Gaulle

5:00 am - 11:47 amLIS Lisbon Humberto Delgado-SEA Seattle/Tacoma Intl

14h 47m1 stop Amsterdam Schiphol

$1,281Delta

Sun, Aug 30 - Mon, Sep 7

1:30 pm - 5:50 pmSEA Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado

20h 20m1 stop Paris Charles de Gaulle

5:00 am - 4:35 pmLIS Lisbon Humberto Delgado-SEA Seattle/Tacoma Intl

19h 35m1 stop Amsterdam Schiphol

$1,286Delta

Fri, Aug 28 - Thu, Sep 3

7:00 pm - 9:50 pmSEA Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado

18h 50m2 stops Reykjavik Keflavik Intl Amsterdam Schiphol

11:00 am - 11:45 amLIS Lisbon Humberto Delgado-SEA Seattle/Tacoma Intl

32h 45m2 stops Barcelona-El Prat Reykjavik Keflavik Intl

$1,389Icelandair

Sun, Aug 30 - Sun, Sep 6

5:50 am - 9:20 amSEA Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado

19h 30m2 stops Vancouver Intl Montreal Pierre Elliott Trudeau Intl

5:05 am - 10:47 pmLIS Lisbon Humberto Delgado-SEA Seattle/Tacoma Intl

25h 42m2 stops Frankfurt am Main Vancouver Intl

$1,499Air Canada

Sun, Aug 30 - Tue, Sep 8

7:20 pm - 9:20 amSEA Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado

30h 00m2 stops Vancouver Intl Montreal Pierre Elliott Trudeau Intl

6:45 am - 6:32 pmLIS Lisbon Humberto Delgado-SEA Seattle/Tacoma Intl

19h 47m2 stops Frankfurt am Main Vancouver Intl

$1,499Air Canada

Sat, Aug 29 - Tue, Sep 8

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Icelandair flights from Seattle to Portugal

Our best Icelandair deals on Seattle to Portugal flight tickets

Icelandair

Jan 20

SEA2:35 pmSeattle/Tacoma Intl

14h 15m

1 stop

LIS12:50 pmLisbon Humberto Delgado

Feb 4

LIS2:00 pmLisbon Humberto Delgado

35h 00m

1 stop

SEA5:00 pmSeattle/Tacoma Intl

$733

Icelandair

Oct 11

SEA7:00 pmSeattle/Tacoma Intl

34h 50m

1 stop

LIS1:50 pmLisbon Humberto Delgado

Oct 25

LIS2:00 pmLisbon Humberto Delgado

13h 40m

1 stop

SEA8:40 pmSeattle/Tacoma Intl

$762

Icelandair

Oct 17

SEA3:40 pmSeattle/Tacoma Intl

14h 10m

1 stop

LIS1:50 pmLisbon Humberto Delgado

Oct 29

LIS2:00 pmLisbon Humberto Delgado

35h 00m

1 stop

SEA6:00 pmSeattle/Tacoma Intl

$770

Air Canada flights from Seattle to Portugal

Our best Air Canada deals on Seattle to Portugal flight tickets

Air Canada

Nov 4

SEA7:45 amSeattle/Tacoma Intl

17h 10m

1 stop

LIS8:55 amLisbon Humberto Delgado

Nov 18

LIS5:00 amLisbon Humberto Delgado

24h 57m

2 stops

SEA9:57 pmSeattle/Tacoma Intl

$748

Air Canada

Jan 18

SEA10:10 amSeattle/Tacoma Intl

15h 10m

2 stops

LIS9:20 amLisbon Humberto Delgado

Feb 3

LIS5:00 amLisbon Humberto Delgado

24h 57m

2 stops

SEA9:57 pmSeattle/Tacoma Intl

$749

Air Canada

Feb 14

SEA7:45 amSeattle/Tacoma Intl

17h 35m

1 stop

LIS9:20 amLisbon Humberto Delgado

Feb 24

LIS5:00 amLisbon Humberto Delgado

21h 22m

2 stops

SEA6:22 pmSeattle/Tacoma Intl

$754

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattleFaro

SEA Seattle/Tacoma Intl - FAO Faro

SEAFAO

Seattle/Tacoma Intl

Mon 10/12

7:10 pm-7:55 pm

1 stop16h 45m

Faro

Wed 10/21

9:05 am-11:44 am

2 stops34h 39m

$711

SeattleFaro

SEA Seattle/Tacoma Intl - FAO Faro

SEAFAO

Seattle/Tacoma Intl

Mon 10/12

7:10 pm-7:55 pm

1 stop16h 45m

Faro

Mon 10/19

7:50 am-9:42 am

2 stops33h 52m

$716

SeattleLisbon

SEA Seattle/Tacoma Intl - LIS Lisbon Humberto Delgado

SEALIS

Seattle/Tacoma Intl

Wed 1/20

2:35 pm-12:50 pm

1 stop14h 15m

Lisbon Humberto Delgado

Thu 2/4

2:00 pm-5:00 pm

1 stop35h 00m

$733

SeattleLisbon

SEA Seattle/Tacoma Intl - LIS Lisbon Humberto Delgado

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

SeattleLisbon

SEA Seattle/Tacoma Intl - LIS Lisbon Humberto Delgado

SEALIS

Seattle/Tacoma Intl

Mon 10/19

8:25 am-10:30 am

1 stop18h 05m

Lisbon Humberto Delgado

Wed 11/4

5:00 am-12:00 pm

1 stop15h 00m

$741

SeattleLisbon

SEA Seattle/Tacoma Intl - LIS Lisbon Humberto Delgado

SEALIS

Seattle/Tacoma Intl

Sat 2/13

3:15 pm-9:20 am

2 stops34h 05m

Lisbon Humberto Delgado

Tue 2/23

5:00 am-6:22 pm

2 stops21h 22m

$741

SeattleLisbon

SEA Seattle/Tacoma Intl - LIS Lisbon Humberto Delgado

SEALIS

Seattle/Tacoma Intl

Sun 11/8

8:09 am-10:05 am

1 stop17h 56m

Lisbon Humberto Delgado

Wed 11/18

5:00 am-12:00 pm

1 stop15h 00m

$745

SeattleLisbon

SEA Seattle/Tacoma Intl - LIS Lisbon Humberto Delgado

SEALIS

Seattle/Tacoma Intl

Sun 11/8

7:05 pm-9:20 am

2 stops30h 15m

Lisbon Humberto Delgado

Wed 11/18

5:00 am-9:57 pm

2 stops24h 57m

$748

SeattleLisbon

SEA Seattle/Tacoma Intl - LIS Lisbon Humberto Delgado

SEALIS

Seattle/Tacoma Intl

Wed 11/4

8:40 am-8:55 am

2 stops16h 15m

Lisbon Humberto Delgado

Wed 11/18

5:00 am-9:57 pm

2 stops24h 57m

$748

Quickest round-trip

SeattleLisbon

SEA Seattle/Tacoma Intl - LIS Lisbon Humberto Delgado

SEALIS

Seattle/Tacoma Intl

Mon 9/28

3:40 pm-1:50 pm

1 stop14h 10m

Lisbon Humberto Delgado

Tue 10/20

3:00 pm-8:40 pm

1 stop13h 40m

$755

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 $577.

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 $853 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 $759 on momondo.

Can stopping save me money on Seattle to Portugal flights?

You could potentially save up to 26% 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

Best Price Found	$256
Fastest flight time	15h 05m
Direct flights	None

The best one-way flight to Portugal from Seattle in the past 72 hours is $256. The best round-trip flight deal from Seattle to Portugal found on momondo in the last 72 hours is $711.

The fastest flight from Seattle to Portugal takes 15h 05m

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 12 as of August 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 6.9 737 reviews	Search Icelandair flights
Lufthansa	PriceFrom $471	Free Cancellation	Rating 6.8 8,221 reviews	Search Lufthansa flights
KLM	PriceFrom $481	Free Cancellation	Rating 7.8 1,565 reviews	Search KLM flights
British Airways	PriceFrom $482	Free Cancellation	Rating 6.7 8,188 reviews	Search British Airways flights
United Airlines	PriceFrom $482	Free Cancellation	Rating 7.4 10,122 reviews	Search United Airlines flights
American Airlines	PriceFrom $497	Free Cancellation	Rating 7.1 11,993 reviews	Search American Airlines flights
Air France	PriceFrom $504	Free Cancellation	Rating 7.5 1,647 reviews	Search Air France flights
Air Canada	PriceFrom $543	Free Cancellation	Rating 7.1 11,532 reviews	Search Air Canada flights
Delta	PriceFrom $554	Free Cancellation	Rating 7.8 8,529 reviews	Search Delta flights
Scandinavian Airlines	PriceFrom $567	Free Cancellation	Rating 7.4 1,963 reviews	Search Scandinavian 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.

Start using Trips

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Find better results for your trip to Portugal

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 $479

Flights to Portofrom $529

Flights to Funchalfrom $543

Flights to Farofrom $559

Flights to Ponta Delgadafrom $579

Flights to Lajesfrom $620

Flights to Hortafrom $685

Flights to Pico Islandfrom $671

Flights to Porto Santofrom $725

Flights to Velasfrom $693

Cheap flights from Seattle to Portugal from $256

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 9/27. 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

Cheap round-trip flights

Cheap one-way flights

Cheap last minute flights

Big names and deals

Big names and deals

Filter for what you want

Filter for what you want

Trusted and free

Trusted and free

Price Alerts

Price Alerts

Icelandair flights from Seattle to Portugal

Our best Icelandair deals on Seattle to Portugal flight tickets

Air Canada flights from Seattle to Portugal

Our best Air Canada 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

Best Price Found

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