What airlines fly to Portugal?

Delta, British Airways and Lufthansa 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 33% of people opting to fly with this airline when traveling to Portugal. Keep in mind that there are 13 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?

Condor is the most popular carrier 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 13 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.

$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.

10:41 am - 4:00 pmSEA Seattle/Tacoma Intl-OPO Porto

21h 19m2 stops Chicago O'Hare Intl Madrid Barajas

8:20 am - 12:41 amOPO Porto-SEA Seattle/Tacoma Intl

24h 21m2 stops Madrid Barajas Chicago O'Hare Intl

$741Iberia

Wed, Nov 11 - Thu, Nov 26

5:40 pm - 7:45 pmSEA Seattle/Tacoma Intl-OPO Porto

18h 05m2 stops Frankfurt am Main Milan Malpensa

5:45 pm - 3:40 pmOPO Porto-SEA Seattle/Tacoma Intl

29h 55m2 stops Milan Malpensa Frankfurt am Main

$742Multiple Airlines

Wed, Oct 7 - Tue, Oct 13

10:10 am - 6:55 amSEA Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado

36h 45m2 stops Vancouver Intl Montreal Pierre Elliott Trudeau Intl

5:00 am - 2:37 pmLIS Lisbon Humberto Delgado-SEA Seattle/Tacoma Intl

17h 37m2 stops Frankfurt am Main Vancouver Intl

$743Air Canada

Tue, Nov 17 - Fri, Nov 27

7:05 pm - 10:40 amSEA Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado

31h 35m2 stops Vancouver Intl Montreal Pierre Elliott Trudeau Intl

5:00 am - 9:27 amLIS Lisbon Humberto Delgado-SEA Seattle/Tacoma Intl

36h 27m2 stops Frankfurt am Main Vancouver Intl

$743Air Canada

Sun, Nov 1 - Wed, Nov 18

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

18h 11m1 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

$744Lufthansa

Wed, Nov 4 - Thu, Nov 19

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

$744Lufthansa

Tue, Nov 3 - Thu, Nov 19

6:45 am - 8:10 amSEA Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado

17h 25m1 stop Newark

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

15h 00m1 stop Frankfurt am Main

$744United Airlines

Mon, Nov 2 - Thu, Nov 19

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

$744United Airlines

Tue, Oct 27 - Thu, Nov 19

3:25 pm - 3:10 pmSEA Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado

15h 45m1 stop Paris Charles de Gaulle

11:30 am - 11:50 amLIS Lisbon Humberto Delgado-SEA Seattle/Tacoma Intl

32h 20m1 stop Amsterdam Schiphol

$745Delta

Mon, Nov 23 - Wed, Dec 2

4:05 pm - 3:10 pmSEA Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado

15h 05m1 stop Paris Charles de Gaulle

11:30 am - 11:50 amLIS Lisbon Humberto Delgado-SEA Seattle/Tacoma Intl

32h 20m1 stop Amsterdam Schiphol

$745Delta

Tue, Nov 17 - Wed, Dec 2

Cheap last minute flights

Enter your travel dates to find the best prices.

2:07 pm - 4:00 pmSEA Seattle/Tacoma Intl-OPO Porto

17h 53m2 stops Dallas/Fort Worth Madrid Barajas

12:25 pm - 12:50 amOPO Porto-SEA Seattle/Tacoma Intl

20h 25m2 stops Madrid Barajas Dallas/Fort Worth

$954American Airlines

Tue, Aug 18 - Thu, Sep 3

11:59 pm - 8:40 amSEA Seattle/Tacoma Intl-PDL Ponta Delgada Nordela

25h 41m2 stops Houston George Bush Intcntl Newark

11:00 am - 1:22 pmPDL Ponta Delgada Nordela-SEA Seattle/Tacoma Intl

33h 22m2 stops Newark Denver Intl

$955United Airlines

Mon, Aug 17 - Tue, Aug 25

3:40 pm - 8:00 amSEA Seattle/Tacoma Intl-OPO Porto

32h 20m3 stops Reykjavik Keflavik Intl Stockholm Arlanda Barcelona-El Prat

10:30 pm - 8:40 pmOPO Porto-SEA Seattle/Tacoma Intl

30h 10m3 stops Lisbon Humberto Delgado Stockholm Arlanda Reykjavik Keflavik Intl

$978Multiple Airlines

Thu, Aug 20 - Thu, Aug 27

8:20 pm - 9:05 amSEA Seattle/Tacoma Intl-OPO Porto

28h 45m1 stop London Heathrow

12:25 pm - 6:25 pmOPO Porto-SEA Seattle/Tacoma Intl

38h 00m2 stops Madrid Barajas London Heathrow

$1,006British Airways

Tue, Aug 18 - Thu, Sep 3

11:48 am - 4:00 pmSEA Seattle/Tacoma Intl-OPO Porto

20h 12m2 stops Dallas/Fort Worth Madrid Barajas

12:25 pm - 12:50 amOPO Porto-SEA Seattle/Tacoma Intl

20h 25m2 stops Madrid Barajas Dallas/Fort Worth

$1,014American Airlines

Thu, Aug 20 - Thu, Aug 27

1:30 pm - 11:15 amSEA Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado

13h 45m1 stop Paris Charles de Gaulle

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

19h 35m1 stop Amsterdam Schiphol

$1,116Delta

Sun, Aug 16 - Sun, Sep 6

11:05 am - 2:55 pmSEA Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado

19h 50m2 stops Salt Lake City Paris Charles de Gaulle

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

14h 47m1 stop Amsterdam Schiphol

$1,120Delta

Sun, Aug 16 - Sun, Sep 6

3:40 pm - 8:05 pmSEA Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado

20h 25m2 stops Reykjavik Keflavik Intl Zurich

10:20 pm - 11:45 amLIS Lisbon Humberto Delgado-SEA Seattle/Tacoma Intl

21h 25m1 stop Reykjavik Keflavik Intl

$1,206Icelandair

Sun, Aug 16 - Thu, Aug 20

2:10 pm - 9:05 amSEA Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado

34h 55m3 stops Frankfurt am Main Oslo Gardermoen Kastrup Copenhagen

5:55 am - 9:00 pmLIS Lisbon Humberto Delgado-SEA Seattle/Tacoma Intl

23h 05m2 stops Dublin Calgary

$1,227Multiple Airlines

Sun, Aug 16 - Sun, Sep 6

5:00 am - 8:20 amSEA Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado

19h 20m2 stops Denver Intl Newark

5:05 am - 11:55 amLIS Lisbon Humberto Delgado-SEA Seattle/Tacoma Intl

14h 50m1 stop Frankfurt am Main

$1,346United Airlines

Sun, Aug 16 - Thu, Aug 20

Save money when you book flights with momondo

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Not ready to book? to track prices.

Search flight deals

KLM flights from Seattle to Portugal

Our best KLM deals on Seattle to Portugal flight tickets

KLM

Sep 23

SEA1:50 pmSeattle/Tacoma Intl

20h 55m

1 stop

LIS6:45 pmLisbon Humberto Delgado

Dec 22

LIS5:00 amLisbon Humberto Delgado

14h 50m

1 stop

SEA11:50 amSeattle/Tacoma Intl

$780

KLM

Sep 24

SEA5:45 pmSeattle/Tacoma Intl

16h 50m

1 stop

FNC6:35 pmFunchal Madeira

Oct 1

FNC10:05 amFunchal Madeira

33h 47m

1 stop

SEA11:52 amSeattle/Tacoma Intl

$873

KLM

Sep 24

SEA5:45 pmSeattle/Tacoma Intl

16h 50m

1 stop

FNC6:35 pmFunchal Madeira

Oct 1

FNC10:05 amFunchal Madeira

38h 39m

2 stops

SEA4:44 pmSeattle/Tacoma Intl

$879

Icelandair flights from Seattle to Portugal

Our best Icelandair deals on Seattle to Portugal flight tickets

Icelandair

Oct 4

SEA7:00 pmSeattle/Tacoma Intl

34h 50m

1 stop

LIS1:50 pmLisbon Humberto Delgado

Oct 20

LIS3:00 pmLisbon Humberto Delgado

13h 40m

1 stop

SEA8:40 pmSeattle/Tacoma Intl

$752

Icelandair

Oct 4

SEA7:00 pmSeattle/Tacoma Intl

34h 50m

1 stop

LIS1:50 pmLisbon Humberto Delgado

Oct 18

LIS3:00 pmLisbon Humberto Delgado

13h 40m

1 stop

SEA8:40 pmSeattle/Tacoma Intl

$753

Icelandair

Oct 4

SEA7:00 pmSeattle/Tacoma Intl

34h 50m

1 stop

LIS1:50 pmLisbon Humberto Delgado

Oct 18

LIS3:00 pmLisbon Humberto Delgado

13h 40m

1 stop

SEA8:40 pmSeattle/Tacoma Intl

$754

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattlePorto

SEA Seattle/Tacoma Intl - OPO Porto

SEAOPO

Seattle/Tacoma Intl

Wed 11/11

10:41 am-4:00 pm

2 stops21h 19m

Porto

Thu 11/26

8:20 am-12:41 am

2 stops24h 21m

$741

SeattlePorto

SEA Seattle/Tacoma Intl - OPO Porto

SEAOPO

Seattle/Tacoma Intl

Wed 10/7

5:40 pm-7:45 pm

2 stops18h 05m

Porto

Tue 10/13

5:45 pm-3:40 pm

2 stops29h 55m

$742

SeattleLisbon

SEA Seattle/Tacoma Intl - LIS Lisbon Humberto Delgado

SEALIS

Seattle/Tacoma Intl

Tue 11/17

10:10 am-6:55 am

2 stops36h 45m

Lisbon Humberto Delgado

Fri 11/27

5:00 am-2:37 pm

2 stops17h 37m

$743

SeattleLisbon

SEA Seattle/Tacoma Intl - LIS Lisbon Humberto Delgado

SEALIS

Seattle/Tacoma Intl

Sun 11/1

7:05 pm-10:40 am

2 stops31h 35m

Lisbon Humberto Delgado

Wed 11/18

5:00 am-9:27 am

2 stops36h 27m

$743

SeattleLisbon

SEA Seattle/Tacoma Intl - LIS Lisbon Humberto Delgado

SEALIS

Seattle/Tacoma Intl

Wed 11/4

8:09 am-10:20 am

1 stop18h 11m

Lisbon Humberto Delgado

Thu 11/19

5:00 am-12:00 pm

1 stop15h 00m

$744

SeattleLisbon

SEA Seattle/Tacoma Intl - LIS Lisbon Humberto Delgado

SEALIS

Seattle/Tacoma Intl

Tue 11/3

8:09 am-10:05 am

1 stop17h 56m

Lisbon Humberto Delgado

Thu 11/19

5:00 am-12:00 pm

1 stop15h 00m

$744

Quickest round-trip

SeattleLisbon

SEA Seattle/Tacoma Intl - LIS Lisbon Humberto Delgado

SEALIS

Seattle/Tacoma Intl

Mon 11/2

6:45 am-8:10 am

1 stop17h 25m

Lisbon Humberto Delgado

Thu 11/19

5:00 am-12:00 pm

1 stop15h 00m

$744

SeattleLisbon

SEA Seattle/Tacoma Intl - LIS Lisbon Humberto Delgado

SEALIS

Seattle/Tacoma Intl

Tue 10/27

8:09 am-10:05 am

1 stop18h 56m

Lisbon Humberto Delgado

Thu 11/19

5:00 am-12:00 pm

1 stop15h 00m

$744

SeattleLisbon

SEA Seattle/Tacoma Intl - LIS Lisbon Humberto Delgado

SEALIS

Seattle/Tacoma Intl

Mon 11/23

3:25 pm-3:10 pm

1 stop15h 45m

Lisbon Humberto Delgado

Wed 12/2

11:30 am-11:50 am

1 stop32h 20m

$745

SeattleLisbon

SEA Seattle/Tacoma Intl - LIS Lisbon Humberto Delgado

SEALIS

Seattle/Tacoma Intl

Tue 11/17

4:05 pm-3:10 pm

1 stop15h 05m

Lisbon Humberto Delgado

Wed 12/2

11:30 am-11:50 am

1 stop32h 20m

$745

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 $578.

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 $848 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 $713 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

Fastest flight time	13h 20m
Direct flights	None

The fastest flight from Seattle to Portugal takes 13h 20m

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 13 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 6.9 731 reviews	Search Icelandair flights
Lufthansa	PriceFrom $475	Free Cancellation	Rating 6.8 8,195 reviews	Search Lufthansa flights
KLM	PriceFrom $481	Free Cancellation	Rating 7.8 1,559 reviews	Search KLM flights
British Airways	PriceFrom $482	Free Cancellation	Rating 6.7 8,168 reviews	Search British Airways flights
United Airlines	PriceFrom $486	Free Cancellation	Rating 7.4 10,110 reviews	Search United Airlines flights
American Airlines	PriceFrom $497	Free Cancellation	Rating 7.1 11,941 reviews	Search American Airlines flights
Air France	PriceFrom $504	Free Cancellation	Rating 7.5 1,643 reviews	Search Air France flights
Aer Lingus	PriceFrom $523	Free Cancellation	Rating 7.3 1,706 reviews	Search Aer Lingus flights
Air Canada	PriceFrom $543	Free Cancellation	Rating 7.1 11,479 reviews	Search Air Canada flights
Delta	PriceFrom $550	Free Cancellation	Rating 7.8 8,508 reviews	Search Delta 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

Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

1 adult

Mon 9/14

Mon 9/21

Email me momondo's favorite deals

By creating a price alert you accept our terms of use and privacy policy.

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 $562

Flights to Portofrom $524

Flights to Funchalfrom $606

Flights to Farofrom $610

Flights to Ponta Delgadafrom $569

Flights to Lajesfrom $633

Flights to Hortafrom $712

Flights to Pico Islandfrom $642

Flights to Porto Santofrom $713

Flights to Velasfrom $694

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 11/3. 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

KLM flights from Seattle to Portugal

Our best KLM 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

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