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

British Airways, KLM, and Air France 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 40% 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 October 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.

$297 Cheap Flights from Seattle to Portugal in 2026/27

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 - 12:45 pmSEA Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado

14h 10m1 stop Reykjavik Keflavik Intl

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

35h 00m1 stop Reykjavik Keflavik Intl

$668Icelandair

Mon, Nov 23 - Tue, Dec 8

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

$668Icelandair

Wed, Jan 6 - Thu, Jan 14

2:50 pm - 12:50 pmSEA Seattle/Tacoma Intl-OPO Porto

14h 00m1 stop Munich Franz Josef Strauss

6:15 am - 1:00 pmOPO Porto-SEA Seattle/Tacoma Intl

14h 45m1 stop Munich Franz Josef Strauss

$694Lufthansa

Sun, Feb 14 - Fri, Feb 26

7:45 am - 6:30 pmSEA Seattle/Tacoma Intl-OPO Porto

26h 45m2 stops Toronto Pearson Intl Zurich

6:15 am - 1:00 pmOPO Porto-SEA Seattle/Tacoma Intl

14h 45m1 stop Munich Franz Josef Strauss

$701Multiple Airlines

Sun, Feb 14 - Fri, Feb 26

4:35 pm - 9:55 pmSEA Seattle/Tacoma Intl-OPO Porto

22h 20m1 stop Paris Charles de Gaulle

6:55 pm - 11:33 amOPO Porto-SEA Seattle/Tacoma Intl

24h 38m1 stop Amsterdam Schiphol

$712Multiple Airlines

Sun, Mar 21 - Mon, Mar 29

7:32 pm - 9:45 amSEA Seattle/Tacoma Intl-OPO Porto

30h 13m3 stops San Francisco Houston George Bush Intcntl Newark

6:00 am - 12:20 pmOPO Porto-SEA Seattle/Tacoma Intl

14h 20m1 stop Frankfurt am Main

$721United Airlines

Sat, Apr 24 - Fri, Apr 30

11:50 pm - 9:45 amSEA Seattle/Tacoma Intl-OPO Porto

25h 55m2 stops Chicago O'Hare Intl Newark

6:00 am - 12:20 pmOPO Porto-SEA Seattle/Tacoma Intl

14h 20m1 stop Frankfurt am Main

$721United Airlines

Sat, Apr 24 - Fri, Apr 30

7:15 am - 10:00 pmSEA Seattle/Tacoma Intl-OPO Porto

31h 45m2 stops New York John F Kennedy Intl Paris Charles de Gaulle

11:45 am - 11:33 amOPO Porto-SEA Seattle/Tacoma Intl

31h 48m1 stop Amsterdam Schiphol

$726Delta

Tue, Mar 23 - Mon, Mar 29

9:30 am - 10:35 amSEA Seattle/Tacoma Intl-OPO Porto

42h 05m2 stops Los Angeles Paris Charles de Gaulle

11:45 am - 11:33 amOPO Porto-SEA Seattle/Tacoma Intl

31h 48m1 stop Amsterdam Schiphol

$728Delta

Mon, Mar 22 - Mon, Mar 29

3:50 pm - 12:50 pmSEA Seattle/Tacoma Intl-OPO Porto

14h 00m1 stop Munich Franz Josef Strauss

6:00 am - 12:20 pmOPO Porto-SEA Seattle/Tacoma Intl

14h 20m1 stop Frankfurt am Main

$741Lufthansa

Sun, Mar 21 - Sun, Mar 28

Cheap last minute flights

Enter your travel dates to find the best prices.

7:45 am - 8:55 amSEA Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado

18h 10m1 stop Toronto Pearson Intl

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

15h 00m1 stop Frankfurt am Main

$817Multiple Airlines

Wed, Oct 28 - Wed, Nov 11

9:05 am - 10:20 amSEA Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado

18h 15m2 stops San Francisco Washington, D.C. Dulles Intl

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

15h 00m1 stop Frankfurt am Main

$832United Airlines

Wed, Oct 28 - Wed, Nov 11

8:30 am - 10:20 amSEA Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado

18h 50m3 stops Denver Intl Newark Washington, D.C. Dulles Intl

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

15h 00m1 stop Frankfurt am Main

$836United Airlines

Wed, Oct 28 - Wed, Nov 11

11:59 pm - 8:55 amSEA Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado

25h 56m1 stop Boston Logan Intl

10:00 am - 11:00 pmLIS Lisbon Humberto Delgado-SEA Seattle/Tacoma Intl

21h 00m1 stop New York John F Kennedy Intl

$865Virgin Atlantic

Sat, Oct 31 - Wed, Nov 11

4:20 pm - 10:00 pmSEA Seattle/Tacoma Intl-OPO Porto

22h 40m1 stop Paris Charles de Gaulle

5:00 am - 11:47 amOPO Porto-SEA Seattle/Tacoma Intl

14h 47m1 stop Amsterdam Schiphol

$880Delta

Fri, Oct 30 - Thu, Nov 5

11:05 am - 3:25 pmSEA Seattle/Tacoma Intl-OPO Porto

21h 20m2 stops Salt Lake City Amsterdam Schiphol

5:00 am - 11:47 amOPO Porto-SEA Seattle/Tacoma Intl

14h 47m1 stop Amsterdam Schiphol

$888Delta

Fri, Oct 30 - Thu, Nov 5

7:45 am - 8:55 amSEA Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado

18h 10m1 stop Toronto Pearson Intl

5:00 am - 8:59 pmLIS Lisbon Humberto Delgado-SEA Seattle/Tacoma Intl

23h 59m2 stops Frankfurt am Main Toronto Pearson Intl

$893Air Canada

Sat, Oct 31 - Wed, Nov 11

3:50 pm - 1:30 pmSEA Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado

14h 40m1 stop Munich Franz Josef Strauss

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

15h 00m1 stop Frankfurt am Main

$911Lufthansa

Fri, Oct 30 - Sun, Nov 8

7:45 am - 8:55 amSEA Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado

18h 10m1 stop Toronto Pearson Intl

6:00 am - 8:59 pmLIS Lisbon Humberto Delgado-SEA Seattle/Tacoma Intl

22h 59m2 stops Munich Franz Josef Strauss Toronto Pearson Intl

$918Air Canada

Sat, Oct 31 - Sat, Nov 7

8:09 am - 10:20 amSEA Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado

19h 11m1 stop Washington, D.C. Dulles Intl

2:20 pm - 1:00 pmLIS Lisbon Humberto Delgado-SEA Seattle/Tacoma Intl

30h 40m1 stop Munich Franz Josef Strauss

$2,244Lufthansa

Thu, Oct 29 - Sat, Nov 7

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Air France flights from Seattle to Portugal

Our best Air France deals on Seattle to Portugal flight tickets

Air France

Oct 29

SEA5:05 pmSeattle/Tacoma Intl

15h 05m

1 stop

LIS3:10 pmLisbon Humberto Delgado

Nov 7

LIS5:30 amLisbon Humberto Delgado

23h 04m

2 stops

SEA8:34 pmSeattle/Tacoma Intl

$2,479

Air France

Oct 29

SEA2:30 pmSeattle/Tacoma Intl

20h 00m

2 stops

LIS5:30 pmLisbon Humberto Delgado

Nov 7

LIS5:30 amLisbon Humberto Delgado

23h 04m

2 stops

SEA8:34 pmSeattle/Tacoma Intl

$2,483

Air France

Oct 29

SEA4:00 pmSeattle/Tacoma Intl

18h 30m

2 stops

LIS5:30 pmLisbon Humberto Delgado

Nov 7

LIS5:30 amLisbon Humberto Delgado

22h 39m

2 stops

SEA8:09 pmSeattle/Tacoma Intl

$2,533

Icelandair flights from Seattle to Portugal

Our best Icelandair deals on Seattle to Portugal flight tickets

Icelandair

Nov 23

SEA2:35 pmSeattle/Tacoma Intl

14h 10m

1 stop

LIS12:45 pmLisbon Humberto Delgado

Dec 8

LIS2:00 pmLisbon Humberto Delgado

35h 00m

1 stop

SEA5:00 pmSeattle/Tacoma Intl

$668

Icelandair

Jan 13

SEA2:35 pmSeattle/Tacoma Intl

14h 15m

1 stop

LIS12:50 pmLisbon Humberto Delgado

Jan 19

LIS11:35 amLisbon Humberto Delgado

13h 25m

1 stop

SEA5:00 pmSeattle/Tacoma Intl

$679

Icelandair

Jan 13

SEA2:35 pmSeattle/Tacoma Intl

14h 15m

1 stop

LIS12:50 pmLisbon Humberto Delgado

Jan 21

LIS2:00 pmLisbon Humberto Delgado

35h 00m

1 stop

SEA5:00 pmSeattle/Tacoma Intl

$680

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattleLisbon

SEA Seattle/Tacoma Intl - LIS Lisbon Humberto Delgado

SEALIS

Seattle/Tacoma Intl

Mon 11/23

2:35 pm-12:45 pm

1 stop14h 10m

Lisbon Humberto Delgado

Tue 12/8

2:00 pm-5:00 pm

1 stop35h 00m

$668

SeattleLisbon

SEA Seattle/Tacoma Intl - LIS Lisbon Humberto Delgado

SEALIS

Seattle/Tacoma Intl

Wed 1/6

2:35 pm-12:50 pm

1 stop14h 15m

Lisbon Humberto Delgado

Thu 1/14

2:00 pm-5:00 pm

1 stop35h 00m

$668

SeattlePorto

SEA Seattle/Tacoma Intl - OPO Porto

SEAOPO

Seattle/Tacoma Intl

Sun 2/14

2:50 pm-12:50 pm

1 stop14h 00m

Porto

Fri 2/26

6:15 am-1:00 pm

1 stop14h 45m

$694

SeattlePorto

SEA Seattle/Tacoma Intl - OPO Porto

SEAOPO

Seattle/Tacoma Intl

Sun 2/14

7:45 am-6:30 pm

2 stops26h 45m

Porto

Fri 2/26

6:15 am-1:00 pm

1 stop14h 45m

$701

SeattlePorto

SEA Seattle/Tacoma Intl - OPO Porto

SEAOPO

Seattle/Tacoma Intl

Sun 3/21

4:35 pm-9:55 pm

1 stop22h 20m

Porto

Mon 3/29

6:55 pm-11:33 am

1 stop24h 38m

$712

SeattlePorto

SEA Seattle/Tacoma Intl - OPO Porto

SEAOPO

Seattle/Tacoma Intl

Sat 4/24

7:32 pm-9:45 am

3 stops30h 13m

Porto

Fri 4/30

6:00 am-12:20 pm

1 stop14h 20m

$721

SeattlePorto

SEA Seattle/Tacoma Intl - OPO Porto

SEAOPO

Seattle/Tacoma Intl

Sat 4/24

11:50 pm-9:45 am

2 stops25h 55m

Porto

Fri 4/30

6:00 am-12:20 pm

1 stop14h 20m

$721

SeattlePorto

SEA Seattle/Tacoma Intl - OPO Porto

SEAOPO

Seattle/Tacoma Intl

Tue 3/23

7:15 am-10:00 pm

2 stops31h 45m

Porto

Mon 3/29

11:45 am-11:33 am

1 stop31h 48m

$726

SeattlePorto

SEA Seattle/Tacoma Intl - OPO Porto

SEAOPO

Seattle/Tacoma Intl

Mon 3/22

9:30 am-10:35 am

2 stops42h 05m

Porto

Mon 3/29

11:45 am-11:33 am

1 stop31h 48m

$728

Quickest round-trip

SeattlePorto

SEA Seattle/Tacoma Intl - OPO Porto

SEAOPO

Seattle/Tacoma Intl

Sun 3/21

3:50 pm-12:50 pm

1 stop14h 00m

Porto

Sun 3/28

6:00 am-12:20 pm

1 stop14h 20m

$741

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 $496, 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 $590.

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 $887 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 $798 on momondo.

Can stopping save me money on Seattle to Portugal flights?

You could potentially save up to 83% 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	$297
Fastest flight time	13h 45m
Direct flights	None

The best one-way flight to Portugal from Seattle in the past 72 hours is $297. The best round-trip flight deal from Seattle to Portugal found on momondo in the last 72 hours is $668.

The fastest flight from Seattle to Portugal takes 13h 45m

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 October 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 $372	Free Cancellation	Rating 7.0 766 reviews	Search Icelandair flights
Lufthansa	PriceFrom $462	Free Cancellation	Rating 6.8 8,291 reviews	Search Lufthansa flights
KLM	PriceFrom $481	Free Cancellation	Rating 7.8 1,597 reviews	Search KLM flights
British Airways	PriceFrom $482	Free Cancellation	Rating 6.7 8,272 reviews	Search British Airways flights
United Airlines	PriceFrom $482	Free Cancellation	Rating 7.3 10,443 reviews	Search United Airlines flights
Air France	PriceFrom $504	Free Cancellation	Rating 7.5 1,652 reviews	Search Air France flights
Delta	PriceFrom $559	Free Cancellation	Rating 7.8 8,681 reviews	Search Delta flights
Scandinavian Airlines	PriceFrom $567	Free Cancellation	Rating 7.4 2,027 reviews	Search Scandinavian Airlines flights
American Airlines	PriceFrom $649	Free Cancellation	Rating 7.0 12,190 reviews	Search American Airlines flights
Air Canada	PriceFrom $660	Free Cancellation	Rating 7.1 11,819 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.

Start using Trips

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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 $449

Flights to Portofrom $400

Flights to Funchalfrom $405

Flights to Farofrom $569

Flights to Ponta Delgadafrom $554

Flights to Lajesfrom $546

Flights to Hortafrom $584

Flights to Pico Islandfrom $788

Flights to Porto Santofrom $1,001

Flights to Velasfrom $583

Cheap flights from Seattle to Portugal from $297

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 11/16. 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

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Trusted and free

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Air France flights from Seattle to Portugal

Our best Air France deals on Seattle to Portugal flight tickets

Icelandair flights from Seattle to Portugal

Our best Icelandair 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