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.

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

KLM, Air France, and Delta 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 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.

$293 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

1:55 pm - 5:00 pmLIS Lisbon Humberto Delgado-SEA Seattle/Tacoma Intl

35h 05m1 stop Reykjavik Keflavik Intl

$634Icelandair

Mon, Nov 23 - Tue, Dec 8

7:45 am - 4:05 pmSEA Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado

24h 20m2 stops Toronto Pearson Intl Kastrup Copenhagen

6:25 pm - 1:00 pmLIS Lisbon Humberto Delgado-SEA Seattle/Tacoma Intl

26h 35m2 stops Kastrup Copenhagen Munich Franz Josef Strauss

$665Multiple Airlines

Tue, Dec 1 - Tue, Dec 8

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

14h 15m1 stop Reykjavik Keflavik Intl

1:55 pm - 5:00 pmLIS Lisbon Humberto Delgado-SEA Seattle/Tacoma Intl

35h 05m1 stop Reykjavik Keflavik Intl

$667Icelandair

Wed, Dec 9 - Tue, Dec 15

6:50 pm - 11:25 pmSEA Seattle/Tacoma Intl-OPO Porto

20h 35m1 stop Munich Franz Josef Strauss

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

14h 20m1 stop Frankfurt am Main

$702Lufthansa

Sun, Apr 18 - Wed, Apr 28

6:50 pm - 11:25 pmSEA Seattle/Tacoma Intl-OPO Porto

20h 35m1 stop Munich Franz Josef Strauss

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

14h 20m1 stop Frankfurt am Main

$702Lufthansa

Sun, Apr 11 - Fri, Apr 23

7:45 am - 4:05 pmSEA Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado

24h 20m2 stops Toronto Pearson Intl Kastrup Copenhagen

6:25 pm - 1:00 pmLIS Lisbon Humberto Delgado-SEA Seattle/Tacoma Intl

26h 35m2 stops Kastrup Copenhagen Munich Franz Josef Strauss

$702Multiple Airlines

Tue, Dec 8 - Tue, Dec 15

1:30 pm - 3:25 pmSEA Seattle/Tacoma Intl-OPO Porto

17h 55m1 stop Paris Charles de Gaulle

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

31h 48m1 stop Amsterdam Schiphol

$721Delta

Tue, Apr 13 - Mon, Apr 19

6:35 pm - 10:00 pmSEA Seattle/Tacoma Intl-OPO Porto

19h 25m1 stop Paris Charles de Gaulle

11:45 am - 4:20 pmOPO Porto-SEA Seattle/Tacoma Intl

36h 35m1 stop Amsterdam Schiphol

$721Delta

Wed, Apr 14 - Wed, Apr 21

1:30 pm - 3:25 pmSEA Seattle/Tacoma Intl-OPO Porto

17h 55m1 stop Paris Charles de Gaulle

5:00 am - 4:20 pmOPO Porto-SEA Seattle/Tacoma Intl

19h 20m1 stop Amsterdam Schiphol

$721KLM

Tue, Apr 13 - Tue, Apr 20

1:30 pm - 3:25 pmSEA Seattle/Tacoma Intl-OPO Porto

17h 55m1 stop Paris Charles de Gaulle

5:00 am - 11:33 amOPO Porto-SEA Seattle/Tacoma Intl

14h 33m1 stop Amsterdam Schiphol

$722KLM

Mon, Apr 19 - Wed, Apr 28

Cheap last minute flights

Enter your travel dates to find the best prices.

8:40 am - 9:20 amSEA Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado

16h 40m2 stops Vancouver Intl Toronto Pearson Intl

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

15h 00m1 stop Frankfurt am Main

$828Multiple Airlines

Tue, Nov 3 - Wed, Nov 11

7:45 am - 9:20 amSEA Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado

17h 35m1 stop Toronto Pearson Intl

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

15h 00m1 stop Frankfurt am Main

$830Multiple Airlines

Tue, Nov 3 - Wed, Nov 11

8:40 am - 9:20 amSEA Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado

16h 40m2 stops Vancouver Intl Toronto Pearson Intl

5:00 am - 11:07 pmLIS Lisbon Humberto Delgado-SEA Seattle/Tacoma Intl

26h 07m2 stops Frankfurt am Main Chicago O'Hare Intl

$850Multiple Airlines

Tue, Nov 3 - Wed, Nov 11

2:30 pm - 6:55 pmSEA Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado

20h 25m2 stops Calgary Rome Fiumicino

4:55 pm - 5:00 pmLIS Lisbon Humberto Delgado-SEA Seattle/Tacoma Intl

32h 05m3 stops Kastrup Copenhagen Stockholm Arlanda Reykjavik Keflavik Intl

$1,168Multiple Airlines

Tue, Nov 3 - Wed, Nov 11

8:40 am - 7:05 pmSEA Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado

26h 25m3 stops Vancouver Intl Munich Franz Josef Strauss Budapest Ferenc Liszt Intl

4:55 pm - 5:00 pmLIS Lisbon Humberto Delgado-SEA Seattle/Tacoma Intl

32h 05m3 stops Kastrup Copenhagen Stockholm Arlanda Reykjavik Keflavik Intl

$1,201Multiple Airlines

Tue, Nov 3 - Wed, Nov 11

8:47 am - 6:20 amSEA Seattle/Tacoma Intl-PDL Ponta Delgada Nordela

14h 33m1 stop Boston Logan Intl

5:50 pm - 10:39 amPDL Ponta Delgada Nordela-SEA Seattle/Tacoma Intl

23h 49m1 stop Boston Logan Intl

$1,703Multiple Airlines

Sun, Nov 1 - Sun, Nov 8

7:00 am - 6:20 amSEA Seattle/Tacoma Intl-PDL Ponta Delgada Nordela

16h 20m2 stops Chicago O'Hare Intl Boston Logan Intl

5:50 pm - 10:39 amPDL Ponta Delgada Nordela-SEA Seattle/Tacoma Intl

23h 49m1 stop Boston Logan Intl

$1,743Multiple Airlines

Sun, Nov 1 - Sun, Nov 8

8:47 am - 6:20 amSEA Seattle/Tacoma Intl-PDL Ponta Delgada Nordela

14h 33m1 stop Boston Logan Intl

5:50 pm - 10:39 amPDL Ponta Delgada Nordela-SEA Seattle/Tacoma Intl

23h 49m1 stop Boston Logan Intl

$1,911Multiple Airlines

Sun, Nov 1 - Sun, Nov 8

7:30 am - 12:05 pmSEA Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado

20h 35m2 stops Dallas/Fort Worth London Heathrow

7:05 am - 4:50 pmLIS Lisbon Humberto Delgado-SEA Seattle/Tacoma Intl

17h 45m1 stop London Heathrow

$10,712British Airways

Wed, Nov 4 - Wed, Nov 25

6:45 pm - 5:45 pmSEA Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado

15h 00m1 stop London Heathrow

7:05 am - 4:50 pmLIS Lisbon Humberto Delgado-SEA Seattle/Tacoma Intl

17h 45m1 stop London Heathrow

$12,297British Airways

Wed, Nov 4 - Wed, Nov 25

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Lufthansa flights from Seattle to Portugal

Our best Lufthansa deals on Seattle to Portugal flight tickets

Lufthansa

Apr 18

SEA6:50 pmSeattle/Tacoma Intl

20h 35m

1 stop

OPO11:25 pmPorto

Apr 28

OPO6:00 amPorto

14h 20m

1 stop

SEA12:20 pmSeattle/Tacoma Intl

$702

Lufthansa

Apr 20

SEA7:00 amSeattle/Tacoma Intl

19h 20m

2 stops

OPO10:20 amPorto

Apr 30

OPO6:00 amPorto

14h 20m

1 stop

SEA12:20 pmSeattle/Tacoma Intl

$706

Lufthansa

Apr 11

SEA7:05 pmSeattle/Tacoma Intl

44h 20m

2 stops

OPO11:25 pmPorto

Apr 16

OPO6:00 amPorto

14h 20m

1 stop

SEA12:20 pmSeattle/Tacoma Intl

$728

Air Canada flights from Seattle to Portugal

Our best Air Canada deals on Seattle to Portugal flight tickets

Air Canada

Apr 12

SEA7:45 amSeattle/Tacoma Intl

43h 40m

2 stops

OPO11:25 amPorto

Apr 21

OPO6:00 amPorto

20h 23m

2 stops

SEA6:23 pmSeattle/Tacoma Intl

$731

Air Canada

Feb 22

SEA10:10 amSeattle/Tacoma Intl

17h 35m

2 stops

OPO11:45 amPorto

Feb 28

OPO6:00 amPorto

16h 37m

2 stops

SEA2:37 pmSeattle/Tacoma Intl

$755

Air Canada

Feb 22

SEA6:55 amSeattle/Tacoma Intl

18h 35m

1 stop

OPO9:30 amPorto

Feb 28

OPO6:00 amPorto

23h 57m

2 stops

SEA9:57 pmSeattle/Tacoma Intl

$759

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

1:55 pm-5:00 pm

1 stop35h 05m

$634

SeattleLisbon

SEA Seattle/Tacoma Intl - LIS Lisbon Humberto Delgado

SEALIS

Seattle/Tacoma Intl

Tue 12/1

7:45 am-4:05 pm

2 stops24h 20m

Lisbon Humberto Delgado

Tue 12/8

6:25 pm-1:00 pm

2 stops26h 35m

$665

SeattleLisbon

SEA Seattle/Tacoma Intl - LIS Lisbon Humberto Delgado

SEALIS

Seattle/Tacoma Intl

Wed 12/9

2:35 pm-12:50 pm

1 stop14h 15m

Lisbon Humberto Delgado

Tue 12/15

1:55 pm-5:00 pm

1 stop35h 05m

$667

SeattlePorto

SEA Seattle/Tacoma Intl - OPO Porto

SEAOPO

Seattle/Tacoma Intl

Sun 4/18

6:50 pm-11:25 pm

1 stop20h 35m

Porto

Wed 4/28

6:00 am-12:20 pm

1 stop14h 20m

$702

SeattlePorto

SEA Seattle/Tacoma Intl - OPO Porto

SEAOPO

Seattle/Tacoma Intl

Sun 4/11

6:50 pm-11:25 pm

1 stop20h 35m

Porto

Fri 4/23

6:00 am-12:20 pm

1 stop14h 20m

$702

SeattleLisbon

SEA Seattle/Tacoma Intl - LIS Lisbon Humberto Delgado

SEALIS

Seattle/Tacoma Intl

Tue 12/8

7:45 am-4:05 pm

2 stops24h 20m

Lisbon Humberto Delgado

Tue 12/15

6:25 pm-1:00 pm

2 stops26h 35m

$702

SeattlePorto

SEA Seattle/Tacoma Intl - OPO Porto

SEAOPO

Seattle/Tacoma Intl

Tue 4/13

1:30 pm-3:25 pm

1 stop17h 55m

Porto

Mon 4/19

11:45 am-11:33 am

1 stop31h 48m

$721

SeattlePorto

SEA Seattle/Tacoma Intl - OPO Porto

SEAOPO

Seattle/Tacoma Intl

Wed 4/14

6:35 pm-10:00 pm

1 stop19h 25m

Porto

Wed 4/21

11:45 am-4:20 pm

1 stop36h 35m

$721

SeattlePorto

SEA Seattle/Tacoma Intl - OPO Porto

SEAOPO

Seattle/Tacoma Intl

Tue 4/13

1:30 pm-3:25 pm

1 stop17h 55m

Porto

Tue 4/20

5:00 am-4:20 pm

1 stop19h 20m

$721

Quickest round-trip

SeattlePorto

SEA Seattle/Tacoma Intl - OPO Porto

SEAOPO

Seattle/Tacoma Intl

Mon 4/19

1:30 pm-3:25 pm

1 stop17h 55m

Porto

Wed 4/28

5:00 am-11:33 am

1 stop14h 33m

$722

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	$293
Fastest flight time	14h 10m
Direct flights	None

The best one-way flight to Portugal from Seattle in the past 72 hours is $293. The best round-trip flight deal from Seattle to Portugal found on momondo in the last 72 hours is $634.

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 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 6.9 764 reviews	Search Icelandair flights
Lufthansa	PriceFrom $462	Free Cancellation	Rating 6.8 8,300 reviews	Search Lufthansa flights
KLM	PriceFrom $481	Free Cancellation	Rating 7.8 1,595 reviews	Search KLM flights
British Airways	PriceFrom $482	Free Cancellation	Rating 6.7 8,277 reviews	Search British Airways flights
United Airlines	PriceFrom $482	Free Cancellation	Rating 7.3 10,454 reviews	Search United Airlines flights
Air France	PriceFrom $504	Free Cancellation	Rating 7.5 1,653 reviews	Search Air France flights
Delta	PriceFrom $559	Free Cancellation	Rating 7.8 8,696 reviews	Search Delta flights
Scandinavian Airlines	PriceFrom $567	Free Cancellation	Rating 7.4 2,031 reviews	Search Scandinavian Airlines flights
American Airlines	PriceFrom $649	Free Cancellation	Rating 7.0 12,217 reviews	Search American Airlines flights
Air Canada	PriceFrom $660	Free Cancellation	Rating 7.1 11,834 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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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 $364

Flights to Portofrom $408

Flights to Funchalfrom $406

Flights to Farofrom $568

Flights to Ponta Delgadafrom $438

Flights to Lajesfrom $310

Flights to Hortafrom $750

Flights to Pico Islandfrom $664

Flights to Porto Santofrom $888

Flights to Velasfrom $688

Cheap flights from Seattle to Portugal from $293

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 11/29. 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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Lufthansa flights from Seattle to Portugal

Our best Lufthansa 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