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

WestJet, British Airways, and KLM 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 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.

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.

$213 Cheap Flights from Seattle to Portugal in 2026

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Seattle to Portugal

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One-way

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Cheap round-trip flights

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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

$699Icelandair

ד', דצמ' 2 - א', דצמ' 13

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

14h 15m1 stop Reykjavik Keflavik Intl

11:35 am - 5:00 pmLIS Lisbon Humberto Delgado-SEA Seattle/Tacoma Intl

13h 25m1 stop Reykjavik Keflavik Intl

$707Icelandair

ד', ינו' 13 - ג', ינו' 19

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

15h 10m2 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

$712Multiple Airlines

ב', פב' 1 - ג', פב' 23

10:10 am - 10:40 amSEA Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado

16h 30m2 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

$713Multiple Airlines

ב', נוב' 2 - ד', נוב' 11

2:50 pm - 11:30 pmSEA Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado

24h 40m1 stop Munich Franz Josef Strauss

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

15h 00m1 stop Munich Franz Josef Strauss

$726Lufthansa

ד', ינו' 20 - ד', פב' 3

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

$732Lufthansa

א', נוב' 8 - ד', נוב' 18

6:45 pm - 6:55 pmSEA Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado

16h 10m1 stop London Heathrow

11:05 am - 10:01 pmLIS Lisbon Humberto Delgado-SEA Seattle/Tacoma Intl

18h 56m1 stop Philadelphia

$736British Airways

ב', פב' 1 - ג', פב' 23

6:45 pm - 9:50 pmSEA Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado

19h 05m1 stop London Heathrow

11:05 am - 10:07 pmLIS Lisbon Humberto Delgado-SEA Seattle/Tacoma Intl

19h 02m1 stop Philadelphia

$736British Airways

ד', ינו' 20 - ד', פב' 3

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

17h 37m2 stops Frankfurt am Main Vancouver Intl

$742Air Canada

א', נוב' 22 - ג', דצמ' 8

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

21h 22m2 stops Frankfurt am Main Vancouver Intl

$742Air Canada

א', נוב' 22 - ו', דצמ' 4

Cheap last minute flights

Enter your travel dates to find the best prices.

1:30 pm - 12:55 pmSEA Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado

15h 25m1 stop London Heathrow

6:45 pm - 11:35 amLIS Lisbon Humberto Delgado-SEA Seattle/Tacoma Intl

24h 50m1 stop London Heathrow

$1,074British Airways

ב', אוג' 10 - ב', אוג' 24

1:30 pm - 12:55 pmSEA Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado

15h 25m1 stop London Heathrow

6:45 pm - 11:35 amLIS Lisbon Humberto Delgado-SEA Seattle/Tacoma Intl

24h 50m1 stop London Heathrow

$1,116British Airways

ב', אוג' 10 - ב', אוג' 24

1:30 pm - 11:25 pmSEA Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado

25h 55m2 stops London Heathrow Madrid Barajas

8:45 pm - 8:52 pmLIS Lisbon Humberto Delgado-SEA Seattle/Tacoma Intl

32h 07m2 stops Madrid Barajas Chicago O'Hare Intl

$1,132Iberia

ב', אוג' 10 - ב', אוג' 24

2:10 pm - 8:30 amSEA Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado

34h 20m3 stops Frankfurt am Main Kastrup Copenhagen Barcelona-El Prat

8:15 pm - 4:59 pmLIS Lisbon Humberto Delgado-SEA Seattle/Tacoma Intl

28h 44m2 stops Kastrup Copenhagen Munich Franz Josef Strauss

$1,138Multiple Airlines

א', אוג' 9 - ב', אוג' 17

7:40 am - 9:05 amSEA Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado

17h 25m2 stops Dallas/Fort Worth Philadelphia

11:05 am - 10:56 pmLIS Lisbon Humberto Delgado-SEA Seattle/Tacoma Intl

19h 51m1 stop Philadelphia

$1,142American Airlines

ב', אוג' 10 - ב', אוג' 24

7:40 am - 9:05 amSEA Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado

17h 25m2 stops Dallas/Fort Worth Philadelphia

11:05 am - 8:35 pmLIS Lisbon Humberto Delgado-SEA Seattle/Tacoma Intl

17h 30m2 stops Philadelphia Cincinnati Cinci./N. Kentucky

$1,142American Airlines

ב', אוג' 10 - ב', אוג' 24

7:15 pm - 3:50 pmSEA Seattle/Tacoma Intl-OPO Porto

36h 35m1 stop Istanbul

10:40 am - 10:43 pmOPO Porto-SEA Seattle/Tacoma Intl

44h 03m2 stops Istanbul Chicago O'Hare Intl

$1,322Turkish Airlines

ש', אוג' 8 - ג', אוג' 25

12:35 pm - 3:40 pmSEA Seattle/Tacoma Intl-OPO Porto

19h 05m1 stop Istanbul

4:50 pm - 8:43 pmOPO Porto-SEA Seattle/Tacoma Intl

35h 53m2 stops Istanbul San Francisco

$1,347Turkish Airlines

ש', אוג' 8 - ג', אוג' 25

3:55 pm - 7:25 pmSEA Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado

19h 30m1 stop Kastrup Copenhagen

10:55 pm - 11:19 pmLIS Lisbon Humberto Delgado-SEA Seattle/Tacoma Intl

32h 24m2 stops Kastrup Copenhagen San Francisco

$1,412Scandinavian Airlines

א', אוג' 9 - ש', אוג' 15

5:50 am - 11:05 amSEA Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado

21h 15m2 stops Vancouver Intl Toronto Pearson Intl

7:25 am - 6:32 pmLIS Lisbon Humberto Delgado-SEA Seattle/Tacoma Intl

19h 07m2 stops Frankfurt am Main Vancouver Intl

$1,575Air Canada

א', אוג' 9 - ש', אוג' 15

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Air Canada flights from Seattle to Portugal

Our best Air Canada deals on Seattle to Portugal flight tickets

Air Canada

Nov 22

SEA7:05 pmSeattle/Tacoma Intl

31h 35m

2 stops

LIS10:40 amLisbon Humberto Delgado

Dec 10

LIS5:00 amLisbon Humberto Delgado

17h 37m

2 stops

SEA2:37 pmSeattle/Tacoma Intl

$742

Air Canada

Nov 25

SEA7:45 amSeattle/Tacoma Intl

17h 10m

1 stop

LIS8:55 amLisbon Humberto Delgado

Dec 10

LIS5:00 amLisbon Humberto Delgado

17h 37m

2 stops

SEA2:37 pmSeattle/Tacoma Intl

$747

Air Canada

Jan 13

SEA8:15 amSeattle/Tacoma Intl

17h 05m

2 stops

LIS9:20 amLisbon Humberto Delgado

Jan 20

LIS5:00 amLisbon Humberto Delgado

17h 37m

2 stops

SEA2:37 pmSeattle/Tacoma Intl

$748

United Airlines flights from Seattle to Portugal

Our best United Airlines deals on Seattle to Portugal flight tickets

United Airlines

Nov 24

SEA8:09 amSeattle/Tacoma Intl

17h 56m

1 stop

LIS10:05 amLisbon Humberto Delgado

Dec 9

LIS5:00 amLisbon Humberto Delgado

15h 00m

1 stop

SEA12:00 pmSeattle/Tacoma Intl

$744

United Airlines

Nov 22

SEA11:15 pmSeattle/Tacoma Intl

24h 55m

1 stop

LIS8:10 amLisbon Humberto Delgado

Dec 9

LIS5:00 amLisbon Humberto Delgado

15h 00m

1 stop

SEA12:00 pmSeattle/Tacoma Intl

$755

United Airlines

Oct 20

SEA8:30 amSeattle/Tacoma Intl

15h 50m

2 stops

LIS8:20 amLisbon Humberto Delgado

Oct 30

LIS6:00 amLisbon Humberto Delgado

15h 00m

1 stop

SEA2:00 pmSeattle/Tacoma Intl

$776

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattleLisbon

SEA Seattle/Tacoma Intl - LIS Lisbon Humberto Delgado

SEALIS

Seattle/Tacoma Intl

ד' 12/2

2:35 pm-12:50 pm

1 stop14h 15m

Lisbon Humberto Delgado

א' 12/13

2:00 pm-5:00 pm

1 stop35h 00m

$699

Quickest round-trip

SeattleLisbon

SEA Seattle/Tacoma Intl - LIS Lisbon Humberto Delgado

SEALIS

Seattle/Tacoma Intl

ד' 1/13

2:35 pm-12:50 pm

1 stop14h 15m

Lisbon Humberto Delgado

ג' 1/19

11:35 am-5:00 pm

1 stop13h 25m

$707

SeattleLisbon

SEA Seattle/Tacoma Intl - LIS Lisbon Humberto Delgado

SEALIS

Seattle/Tacoma Intl

ב' 2/1

10:10 am-9:20 am

2 stops15h 10m

Lisbon Humberto Delgado

ג' 2/23

6:05 am-6:22 pm

2 stops20h 17m

$712

SeattleLisbon

SEA Seattle/Tacoma Intl - LIS Lisbon Humberto Delgado

SEALIS

Seattle/Tacoma Intl

ב' 11/2

10:10 am-10:40 am

2 stops16h 30m

Lisbon Humberto Delgado

ד' 11/11

5:00 am-2:37 pm

2 stops17h 37m

$713

SeattleLisbon

SEA Seattle/Tacoma Intl - LIS Lisbon Humberto Delgado

SEALIS

Seattle/Tacoma Intl

ד' 1/20

2:50 pm-11:30 pm

1 stop24h 40m

Lisbon Humberto Delgado

ד' 2/3

6:00 am-1:00 pm

1 stop15h 00m

$726

SeattleLisbon

SEA Seattle/Tacoma Intl - LIS Lisbon Humberto Delgado

SEALIS

Seattle/Tacoma Intl

א' 11/8

2:50 pm-1:30 pm

1 stop14h 40m

Lisbon Humberto Delgado

ד' 11/18

5:00 am-12:00 pm

1 stop15h 00m

$732

SeattleLisbon

SEA Seattle/Tacoma Intl - LIS Lisbon Humberto Delgado

SEALIS

Seattle/Tacoma Intl

ב' 2/1

6:45 pm-6:55 pm

1 stop16h 10m

Lisbon Humberto Delgado

ג' 2/23

11:05 am-10:01 pm

1 stop18h 56m

$736

SeattleLisbon

SEA Seattle/Tacoma Intl - LIS Lisbon Humberto Delgado

SEALIS

Seattle/Tacoma Intl

ד' 1/20

6:45 pm-9:50 pm

1 stop19h 05m

Lisbon Humberto Delgado

ד' 2/3

11:05 am-10:07 pm

1 stop19h 02m

$736

SeattleLisbon

SEA Seattle/Tacoma Intl - LIS Lisbon Humberto Delgado

SEALIS

Seattle/Tacoma Intl

א' 11/22

3:15 pm-10:40 am

2 stops35h 25m

Lisbon Humberto Delgado

ג' 12/8

5:00 am-2:37 pm

2 stops17h 37m

$742

SeattleLisbon

SEA Seattle/Tacoma Intl - LIS Lisbon Humberto Delgado

SEALIS

Seattle/Tacoma Intl

א' 11/22

7:05 pm-10:40 am

2 stops31h 35m

Lisbon Humberto Delgado

ו' 12/4

5:00 am-6:22 pm

2 stops21h 22m

$742

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 $489, 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 $575.

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 $843 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 $728 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	14h 00m
Direct flights	None

The fastest flight from Seattle to Portugal takes 14h 00m

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 7.0 721 reviews	Search Icelandair flights
Lufthansa	PriceFrom $475	Free Cancellation	Rating 6.8 8,176 reviews	Search Lufthansa flights
KLM	PriceFrom $481	Free Cancellation	Rating 7.8 1,555 reviews	Search KLM flights
British Airways	PriceFrom $482	Free Cancellation	Rating 6.7 8,147 reviews	Search British Airways flights
United Airlines	PriceFrom $488	Free Cancellation	Rating 7.4 10,072 reviews	Search United Airlines flights
American Airlines	PriceFrom $497	Free Cancellation	Rating 7.1 11,862 reviews	Search American Airlines flights
Air France	PriceFrom $505	Free Cancellation	Rating 7.5 1,637 reviews	Search Air France flights
Aer Lingus	PriceFrom $523	Free Cancellation	Rating 7.3 1,690 reviews	Search Aer Lingus flights
Air Canada	PriceFrom $543	Free Cancellation	Rating 7.1 11,429 reviews	Search Air Canada flights
Delta	PriceFrom $550	Free Cancellation	Rating 7.8 8,492 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

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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 $552

Flights to Portofrom $530

Flights to Funchalfrom $622

Flights to Farofrom $612

Flights to Ponta Delgadafrom $574

Flights to Lajesfrom $604

Flights to Hortafrom $659

Flights to Pico Islandfrom $725

Flights to Porto Santofrom $710

Flights to Velasfrom $695

Cheap flights from Seattle to Portugal from $245

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 12/7. 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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Price Alerts

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Air Canada flights from Seattle to Portugal

Our best Air Canada deals on Seattle to Portugal flight tickets

United Airlines flights from Seattle to Portugal

Our best United Airlines 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