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

Delta, United Airlines, 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 39% 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.

$60 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 - 8:30 amSEA Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado

33h 55m3 stops Reykjavik Keflavik Intl Stockholm Arlanda Barcelona-El Prat

6:25 pm - 5:00 pmLIS Lisbon Humberto Delgado-SEA Seattle/Tacoma Intl

30h 35m3 stops Kastrup Copenhagen Stockholm Arlanda Reykjavik Keflavik Intl

$664Multiple Airlines

Wed, Dec 2 - 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

$665Icelandair

Wed, Dec 2 - 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

$665Icelandair

Wed, Dec 2 - Thu, Dec 17

7:45 am - 3:45 pmSEA Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado

24h 00m2 stops Toronto Pearson Intl Kastrup Copenhagen

6:55 pm - 1:00 pmLIS Lisbon Humberto Delgado-SEA Seattle/Tacoma Intl

26h 05m2 stops Kastrup Copenhagen Munich Franz Josef Strauss

$680Multiple Airlines

Tue, Dec 1 - Tue, Dec 8

4:05 pm - 10:00 pmSEA Seattle/Tacoma Intl-OPO Porto

21h 55m1 stop Paris Charles de Gaulle

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

14h 47m1 stop Amsterdam Schiphol

$712Delta

Tue, Feb 2 - Fri, Feb 5

3:30 pm - 10:00 pmSEA Seattle/Tacoma Intl-OPO Porto

22h 30m1 stop Paris Charles de Gaulle

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

14h 47m1 stop Amsterdam Schiphol

$712Delta

Mon, Feb 1 - Fri, Feb 5

7:45 am - 11:15 amSEA Seattle/Tacoma Intl-OPO Porto

43h 30m2 stops Toronto Pearson Intl Zurich

6:00 am - 2:37 pmOPO Porto-SEA Seattle/Tacoma Intl

16h 37m2 stops Frankfurt am Main Vancouver Intl

$721Air Canada

Mon, Feb 1 - Fri, Feb 5

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

17h 35m1 stop Toronto Pearson Intl

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

24h 57m2 stops Frankfurt am Main Vancouver Intl

$721Air Canada

Tue, Dec 1 - Tue, Dec 8

2:50 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

$729Lufthansa

Wed, Dec 2 - Wed, Dec 9

8:08 am - 3:20 pmSEA Seattle/Tacoma Intl-OPO Porto

23h 12m2 stops Washington, D.C. Dulles Intl Frankfurt am Main

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

14h 45m1 stop Munich Franz Josef Strauss

$732Lufthansa

Wed, Feb 3 - Fri, Feb 5

Cheap last minute flights

Enter your travel dates to find the best prices.

6:17 am - 8:10 amSEA Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado

18h 53m1 stop Newark

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

15h 00m1 stop Frankfurt am Main

$826United Airlines

Sun, Oct 25 - Wed, Nov 18

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

18h 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

$826United Airlines

Sun, Oct 25 - Thu, Nov 19

4:20 pm - 5:30 pmSEA Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado

18h 10m1 stop Paris Charles de Gaulle

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

14h 47m1 stop Amsterdam Schiphol

$827Delta

Sun, Oct 25 - Tue, Nov 17

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

41h 00m2 stops Vancouver Intl Montreal Pierre Elliott Trudeau Intl

6:05 am - 6:22 pmLIS Lisbon Humberto Delgado-SEA Seattle/Tacoma Intl

20h 17m2 stops Munich Franz Josef Strauss Vancouver Intl

$827Air Canada

Sun, Oct 25 - Thu, Nov 19

7:05 pm - 10:10 amSEA Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado

32h 05m2 stops Vancouver Intl Montreal Pierre Elliott Trudeau Intl

6:05 am - 6:22 pmLIS Lisbon Humberto Delgado-SEA Seattle/Tacoma Intl

20h 17m2 stops Munich Franz Josef Strauss Vancouver Intl

$827Air Canada

Sun, Oct 25 - Tue, Nov 17

4:20 pm - 5:30 pmSEA Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado

18h 10m1 stop Paris Charles de Gaulle

12:25 pm - 1:50 pmLIS Lisbon Humberto Delgado-SEA Seattle/Tacoma Intl

33h 25m1 stop Paris Charles de Gaulle

$847Delta

Sun, Oct 25 - Mon, Nov 16

7:15 pm - 10:00 amSEA Seattle/Tacoma Intl-OPO Porto

30h 45m1 stop Istanbul

4:10 pm - 6:10 pmOPO Porto-SEA Seattle/Tacoma Intl

33h 00m1 stop Istanbul

$872Turkish Airlines

Tue, Oct 20 - Tue, Oct 27

3:35 pm - 11:35 amSEA Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado

37h 00m2 stops San Francisco Zurich

3:35 pm - 11:07 pmLIS Lisbon Humberto Delgado-SEA Seattle/Tacoma Intl

39h 32m2 stops Zurich Chicago O'Hare Intl

$878SWISS

Sun, Oct 25 - Mon, Nov 16

1:16 pm - 11:35 amSEA Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado

39h 19m2 stops San Francisco Zurich

12:35 pm - 11:07 pmLIS Lisbon Humberto Delgado-SEA Seattle/Tacoma Intl

42h 32m2 stops Zurich Chicago O'Hare Intl

$898SWISS

Sun, Oct 25 - Sat, Nov 21

7:15 pm - 10:00 amSEA Seattle/Tacoma Intl-OPO Porto

30h 45m1 stop Istanbul

4:25 pm - 6:10 pmOPO Porto-SEA Seattle/Tacoma Intl

32h 45m1 stop Istanbul

$956Turkish Airlines

Tue, Oct 20 - Mon, Oct 26

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Icelandair flights from Seattle to Portugal

Our best Icelandair deals on Seattle to Portugal flight tickets

Icelandair

Dec 2

SEA2:35 pmSeattle/Tacoma Intl

14h 15m

1 stop

LIS12:50 pmLisbon Humberto Delgado

Dec 8

LIS2:00 pmLisbon Humberto Delgado

35h 00m

1 stop

SEA5:00 pmSeattle/Tacoma Intl

$665

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

$667

Icelandair

Dec 9

SEA2:35 pmSeattle/Tacoma Intl

14h 15m

1 stop

LIS12:50 pmLisbon Humberto Delgado

Dec 15

LIS2:00 pmLisbon Humberto Delgado

35h 00m

1 stop

SEA5:00 pmSeattle/Tacoma Intl

$681

Lufthansa flights from Seattle to Portugal

Our best Lufthansa deals on Seattle to Portugal flight tickets

Lufthansa

Dec 2

SEA2:50 pmSeattle/Tacoma Intl

14h 40m

1 stop

LIS1:30 pmLisbon Humberto Delgado

Dec 9

LIS5:00 amLisbon Humberto Delgado

15h 00m

1 stop

SEA12:00 pmSeattle/Tacoma Intl

$729

Lufthansa

Feb 3

SEA8:08 amSeattle/Tacoma Intl

23h 12m

2 stops

OPO3:20 pmPorto

Feb 5

OPO6:15 amPorto

14h 45m

1 stop

SEA1:00 pmSeattle/Tacoma Intl

$732

Lufthansa

Dec 2

SEA2:50 pmSeattle/Tacoma Intl

14h 40m

1 stop

LIS1:30 pmLisbon Humberto Delgado

Dec 9

LIS6:00 amLisbon Humberto Delgado

15h 00m

1 stop

SEA1:00 pmSeattle/Tacoma Intl

$737

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattleLisbon

SEA Seattle/Tacoma Intl - LIS Lisbon Humberto Delgado

SEALIS

Seattle/Tacoma Intl

Wed 12/2

2:35 pm-8:30 am

3 stops33h 55m

Lisbon Humberto Delgado

Tue 12/8

6:25 pm-5:00 pm

3 stops30h 35m

$664

SeattleLisbon

SEA Seattle/Tacoma Intl - LIS Lisbon Humberto Delgado

SEALIS

Seattle/Tacoma Intl

Wed 12/2

2:35 pm-12:50 pm

1 stop14h 15m

Lisbon Humberto Delgado

Tue 12/8

2:00 pm-5:00 pm

1 stop35h 00m

$665

SeattleLisbon

SEA Seattle/Tacoma Intl - LIS Lisbon Humberto Delgado

SEALIS

Seattle/Tacoma Intl

Wed 12/2

2:35 pm-12:50 pm

1 stop14h 15m

Lisbon Humberto Delgado

Thu 12/17

2:00 pm-5:00 pm

1 stop35h 00m

$665

SeattleLisbon

SEA Seattle/Tacoma Intl - LIS Lisbon Humberto Delgado

SEALIS

Seattle/Tacoma Intl

Tue 12/1

7:45 am-3:45 pm

2 stops24h 00m

Lisbon Humberto Delgado

Tue 12/8

6:55 pm-1:00 pm

2 stops26h 05m

$680

SeattlePorto

SEA Seattle/Tacoma Intl - OPO Porto

SEAOPO

Seattle/Tacoma Intl

Tue 2/2

4:05 pm-10:00 pm

1 stop21h 55m

Porto

Fri 2/5

5:00 am-11:47 am

1 stop14h 47m

$712

SeattlePorto

SEA Seattle/Tacoma Intl - OPO Porto

SEAOPO

Seattle/Tacoma Intl

Mon 2/1

3:30 pm-10:00 pm

1 stop22h 30m

Porto

Fri 2/5

5:00 am-11:47 am

1 stop14h 47m

$712

SeattlePorto

SEA Seattle/Tacoma Intl - OPO Porto

SEAOPO

Seattle/Tacoma Intl

Mon 2/1

7:45 am-11:15 am

2 stops43h 30m

Porto

Fri 2/5

6:00 am-2:37 pm

2 stops16h 37m

$721

SeattleLisbon

SEA Seattle/Tacoma Intl - LIS Lisbon Humberto Delgado

SEALIS

Seattle/Tacoma Intl

Tue 12/1

7:45 am-9:20 am

1 stop17h 35m

Lisbon Humberto Delgado

Tue 12/8

5:00 am-9:57 pm

2 stops24h 57m

$721

Quickest round-trip

SeattleLisbon

SEA Seattle/Tacoma Intl - LIS Lisbon Humberto Delgado

SEALIS

Seattle/Tacoma Intl

Wed 12/2

2:50 pm-1:30 pm

1 stop14h 40m

Lisbon Humberto Delgado

Wed 12/9

5:00 am-12:00 pm

1 stop15h 00m

$729

SeattlePorto

SEA Seattle/Tacoma Intl - OPO Porto

SEAOPO

Seattle/Tacoma Intl

Wed 2/3

8:08 am-3:20 pm

2 stops23h 12m

Porto

Fri 2/5

6:15 am-1:00 pm

1 stop14h 45m

$732

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 $498, 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 $585.

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 $876 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 $800 on momondo.

Can stopping save me money on Seattle to Portugal flights?

You could potentially save up to 5% 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	$60
Fastest flight time	14h 10m
Direct flights	None

The best one-way flight to Portugal from Seattle in the past 72 hours is $60. The best round-trip flight deal from Seattle to Portugal found on momondo in the last 72 hours is $664.

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 6.9 761 reviews	Search Icelandair flights
Lufthansa	PriceFrom $471	Free Cancellation	Rating 6.8 8,279 reviews	Search Lufthansa flights
KLM	PriceFrom $481	Free Cancellation	Rating 7.8 1,591 reviews	Search KLM flights
British Airways	PriceFrom $482	Free Cancellation	Rating 6.7 8,265 reviews	Search British Airways flights
United Airlines	PriceFrom $482	Free Cancellation	Rating 7.3 10,387 reviews	Search United Airlines flights
Air France	PriceFrom $504	Free Cancellation	Rating 7.5 1,651 reviews	Search Air France flights
Delta	PriceFrom $550	Free Cancellation	Rating 7.8 8,651 reviews	Search Delta flights
Scandinavian Airlines	PriceFrom $567	Free Cancellation	Rating 7.4 2,019 reviews	Search Scandinavian Airlines flights
American Airlines	PriceFrom $649	Free Cancellation	Rating 7.0 12,172 reviews	Search American Airlines flights
Air Canada	PriceFrom $660	Free Cancellation	Rating 7.1 11,782 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 $405

Flights to Portofrom $396

Flights to Funchalfrom $405

Flights to Farofrom $570

Flights to Ponta Delgadafrom $553

Flights to Lajesfrom $554

Flights to Hortafrom $550

Flights to Pico Islandfrom $557

Flights to Porto Santofrom $1,072

Flights to Velasfrom $557

Cheap flights from Seattle to Portugal from $60

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

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

Lufthansa flights from Seattle to Portugal

Our best Lufthansa 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