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

Iberia, British Airways, and American Airlines are the most popular carriers operating from Portugal to Seattle/Tacoma Intl

What airlines fly to Seattle?

British Airways, Delta and Air France are the top three most popular airlines that fly to Seattle from Portugal according to our data. British Airways is the first choice among our users, with 33% of people opting to fly with this airline when traveling to Seattle. Keep in mind that there are 4 different airlines that fly to Seattle on a routine basis, so you have a few additional options to choose from.

How long does it take to fly to Seattle?

Flight times vary depending on what airport in Portugal you fly out of and what airport in Seattle you fly into. For example, flying from Lisbon to Seattle takes 14h 04m on average. On the other hand, flying from Porto to Seattle takes 23h 45m on average. Keep in mind that it’s always quicker to opt for a non-stop flight, so be sure to check momondo if there are any available for your route.

When did momondo last update prices for flights from Portugal to Seattle/Tacoma Intl Airport?

Prices for flights from Portugal to Seattle/Tacoma Intl Airport are updated daily.

How many operators does momondo search for flights from Portugal to Seattle/Tacoma Intl Airport?

As of November 2025, there are 4 operators available to choose from for flights from Portugal to Seattle/Tacoma Intl Airport.

How old do you have to be to fly from Portugal to Seattle/Tacoma Intl Airport?

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 Portugal to Seattle/Tacoma Intl Airport.

What documentation or ID do you need to fly to Seattle/Tacoma Intl Airport?

The necessary travel and health documents for your Seattle/Tacoma Intl Airport 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.

$426 Cheap Flights from Portugal to Seattle in 2025/26

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Find the cheapest flights from Portugal to Seattle

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Recent round-trip flight deals from Portugal to Seattle

Enter your travel dates to find the best prices.

7:00 am - 10:16 pmLIS-SEA

23h 16m2 stops

3:55 pm - 9:00 amSEA-LIS

33h 05m1 stop

$801Scandinavian Airlines

Find Deal

Thu, Apr 30 - Fri, May 29

5:00 am - 12:10 pmLIS-SEA

15h 10m1 stop

2:00 pm - 2:30 pmSEA-LIS

16h 30m1 stop

$846Lufthansa

Find Deal

Mon, Dec 15 - Tue, Dec 30

6:00 am - 10:45 pmOPO-SEA

23h 45m2 stops

7:00 am - 9:45 amSEA-OPO

18h 45m2 stops

$857United Airlines

Find Deal

Thu, Mar 26 - Mon, Mar 30

5:00 am - 12:10 pmLIS-SEA

15h 10m1 stop

7:00 am - 9:20 amSEA-LIS

18h 20m2 stops

$859United Airlines

Find Deal

Mon, Dec 15 - Tue, Dec 30

5:00 am - 1:10 pmLIS-SEA

15h 10m1 stop

8:00 am - 10:30 amSEA-LIS

18h 30m1 stop

$860Lufthansa

Find Deal

Thu, Mar 26 - Mon, Mar 30

5:00 am - 12:10 pmLIS-SEA

15h 10m1 stop

2:00 pm - 2:30 pmSEA-LIS

16h 30m1 stop

$861United Airlines

Find Deal

Mon, Dec 15 - Tue, Dec 30

6:15 am - 7:18 pmLIS-SEA

21h 03m2 stops

7:45 pm - 9:20 amSEA-LIS

29h 35m2 stops

$873Air Canada

Find Deal

Thu, Apr 30 - Fri, May 29

8:55 am - 9:59 pmLIS-SEA

21h 04m1 stop

6:50 pm - 9:45 pmSEA-LIS

18h 55m1 stop

$877British Airways

Find Deal

Thu, Dec 18 - Tue, Dec 30

8:40 pm - 8:58 pmOPO-SEA

32h 18m2 stops

6:00 am - 7:40 amSEA-OPO

17h 40m2 stops

$1,315Iberia

Find Deal

Tue, Dec 30 - Tue, Jan 6

8:20 am - 9:11 pmOPO-SEA

20h 51m2 stops

1:07 am - 7:40 amSEA-OPO

22h 33m2 stops

$1,362Iberia

Find Deal

Tue, Dec 30 - Mon, Jan 5

Lufthansa flights from Portugal to Seattle

Our best Lufthansa deals on Portugal to Seattle flight tickets

Lufthansa

Dec 15

LIS5:00 amLisbon Humberto Delgado

15h 10m

1 stop

SEA12:10 pmSeattle/Tacoma Intl

Dec 30

SEA2:00 pmSeattle/Tacoma Intl

16h 30m

1 stop

LIS2:30 pmLisbon Humberto Delgado

$846

Find similar

Lufthansa

Mar 26

LIS5:00 amLisbon Humberto Delgado

15h 10m

1 stop

SEA1:10 pmSeattle/Tacoma Intl

Mar 30

SEA8:00 amSeattle/Tacoma Intl

18h 30m

1 stop

LIS10:30 amLisbon Humberto Delgado

$860

Find similar

Lufthansa

Dec 15

LIS5:00 amLisbon Humberto Delgado

23h 54m

2 stops

SEA8:54 pmSeattle/Tacoma Intl

Dec 30

SEA2:00 pmSeattle/Tacoma Intl

16h 30m

1 stop

LIS2:30 pmLisbon Humberto Delgado

$870

Find similar

United Airlines flights from Portugal to Seattle

Our best United Airlines deals on Portugal to Seattle flight tickets

United Airlines

Mar 26

OPO6:00 amPorto

22h 14m

2 stops

SEA9:14 pmSeattle/Tacoma Intl

Mar 30

SEA12:25 pmSeattle/Tacoma Intl

13h 20m

1 stop

OPO9:45 amPorto

$857

Find similar

United Airlines

Dec 15

LIS5:00 amLisbon Humberto Delgado

15h 10m

1 stop

SEA12:10 pmSeattle/Tacoma Intl

Dec 30

SEA7:00 amSeattle/Tacoma Intl

18h 20m

2 stops

LIS9:20 amLisbon Humberto Delgado

$859

Find similar

United Airlines

Dec 15

LIS5:00 amLisbon Humberto Delgado

15h 10m

1 stop

SEA12:10 pmSeattle/Tacoma Intl

Dec 30

SEA2:00 pmSeattle/Tacoma Intl

16h 30m

1 stop

LIS2:30 pmLisbon Humberto Delgado

$861

Find similar

Fly from

Fly to

Route

Depart

Return

Price

LisbonSeattle

LIS - SEA

LISSEA

Lisbon Humberto Delgado

Thu 4/30

7:00 am-10:16 pm

2 stops23h 16m

Seattle/Tacoma Intl

Fri 5/29

3:55 pm-9:00 am

1 stop33h 05m

$801

LisbonSeattle

LIS - SEA

LISSEA

Lisbon Humberto Delgado

Mon 12/15

5:00 am-12:10 pm

1 stop15h 10m

Seattle/Tacoma Intl

Tue 12/30

2:00 pm-2:30 pm

1 stop16h 30m

$846

PortoSeattle

OPO - SEA

OPOSEA

Porto

Thu 3/26

6:00 am-10:45 pm

2 stops23h 45m

Seattle/Tacoma Intl

Mon 3/30

7:00 am-9:45 am

2 stops18h 45m

$857

LisbonSeattle

LIS - SEA

LISSEA

Lisbon Humberto Delgado

Mon 12/15

5:00 am-12:10 pm

1 stop15h 10m

Seattle/Tacoma Intl

Tue 12/30

7:00 am-9:20 am

2 stops18h 20m

$859

LisbonSeattle

LIS - SEA

LISSEA

Lisbon Humberto Delgado

Thu 3/26

5:00 am-1:10 pm

1 stop15h 10m

Seattle/Tacoma Intl

Mon 3/30

8:00 am-10:30 am

1 stop18h 30m

$860

LisbonSeattle

LIS - SEA

LISSEA

Lisbon Humberto Delgado

Mon 12/15

5:00 am-12:10 pm

1 stop15h 10m

Seattle/Tacoma Intl

Tue 12/30

2:00 pm-2:30 pm

1 stop16h 30m

$861

LisbonSeattle

LIS - SEA

LISSEA

Lisbon Humberto Delgado

Thu 4/30

6:15 am-7:18 pm

2 stops21h 03m

Seattle/Tacoma Intl

Fri 5/29

7:45 pm-9:20 am

2 stops29h 35m

$873

LisbonSeattle

LIS - SEA

LISSEA

Lisbon Humberto Delgado

Thu 12/18

8:55 am-9:59 pm

1 stop21h 04m

Seattle/Tacoma Intl

Tue 12/30

6:50 pm-9:45 pm

1 stop18h 55m

$877

PortoSeattle

OPO - SEA

OPOSEA

Porto

Tue 12/30

8:40 pm-8:58 pm

2 stops32h 18m

Seattle/Tacoma Intl

Tue 1/6

6:00 am-7:40 am

2 stops17h 40m

$1,315

PortoSeattle

OPO - SEA

OPOSEA

Porto

Tue 12/30

8:20 am-9:11 pm

2 stops20h 51m

Seattle/Tacoma Intl

Mon 1/5

1:07 am-7:40 am

2 stops22h 33m

$1,362

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Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from Portugal to Seattle

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

Other information

What is the cheapest month to fly to Seattle?

In general, April is the cheapest month to fly from Portugal to Seattle. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $800. If you don’t want to visit Seattle in April, then you should wait until May to fly from Portugal, when ticket prices are also cheap, with an average price of $801.

What is the cheapest day to depart on your flight to Seattle?

On average, the least expensive day to fly to Seattle from Portugal is on a Wednesday. momondo users have found tickets for Wednesday departures for as low as $800. However, this price may fluctuate depending on the airline, the season, and holidays. On the other hand, Saturday is the most expensive day to depart from Portugal because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $1,074.

What is the cheapest time of day to depart on your flight to Seattle?

Flying to Seattle from Portugal in the evening is the least expensive time of day to depart. momondo users have found prices as low as $718 when looking at flights departing in the evening. Flights to Seattle are more costly in the morning, with an average ticket price of $873. Departure times in the morning fall within the peak daily travel times, which is why tickets can be more expensive.

How far in advance should I book a flight to Seattle?

You are more likely to see cheaper flights to Seattle from Portugal when booking weeks ahead of your departure date. In general, you can expect to find flights to Seattle for around $946 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Seattle from Portugal for as low as $792 on momondo.

Can stopping save me money on Portugal to Seattle flights?

You could potentially save up to 23% on your flight if you consider stops on a Portugal to Seattle flight.

Cheap Portugal to Seattle flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Portugal to Seattle

Direct flights	None

There are no direct flights from Portugal to Seattle. There are no popular flight routes from Portugal to Seattle.

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When did momondo last update prices for flights from Portugal to Seattle/Tacoma Intl Airport?
Prices for flights from Portugal to Seattle/Tacoma Intl Airport are updated daily.
How many operators does momondo search for flights from Portugal to Seattle/Tacoma Intl Airport?
As of November 2025, there are 4 operators available to choose from for flights from Portugal to Seattle/Tacoma Intl Airport.
How old do you have to be to fly from Portugal to Seattle/Tacoma Intl Airport?
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 Portugal to Seattle/Tacoma Intl Airport.
What documentation or ID do you need to fly to Seattle/Tacoma Intl Airport?
The necessary travel and health documents for your Seattle/Tacoma Intl Airport 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 Portugal to Seattle

Compare and see reviews for airlines that fly from Portugal to Seattle with momondo

Airline	Rating	Free Cancellation	Price
British Airways	PriceFrom $720	Free Cancellation	Rating 6.7 7,528 reviews	Search British Airways flights
United Airlines	PriceFrom $738	Free Cancellation	Rating 7.4 9,014 reviews	Search United Airlines flights
Air France	PriceFrom $762	Free Cancellation	Rating 7.4 1,489 reviews	Search Air France flights
Delta	PriceFrom $775	Free Cancellation	Rating 7.9 8,006 reviews	Search Delta flights

Tacoma

Leavenworth

SeaTac

Ocean Shores

Renton

Olympia

Lynnwood

Kent

Puyallup

Marysville

Redmond

Tukwila

Lakewood

Federal Way

Fife

Cle Elum

Centralia

Kirkland

Westport

Shoreline

Why use momondo?

Why should I use momondo to find a flight deal from Portugal to Seattle?

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Portugal to Seattle for you.

Can I find flights from Portugal to Seattle with flexible booking policies on momondo?

Yes. All flights to Seattle from Portugal on momondo can be compared and filtered by various policies on offer, including flexible booking.

How can momondo help me find flights from Portugal to Seattle?

Once all potential Portugal to Seattle flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

I’m not ready to book a flight from Portugal to Seattle right now. Can momondo alert me if prices change?

Price alerts on flights to Seattle from Portugal are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.