What airlines fly to Seattle?

British Airways, Delta and United Airlines 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 30% of people opting to fly with this airline when traveling to Seattle. Keep in mind that there are 5 different airlines that fly to Seattle on a routine basis, so you have a few additional options to choose from.

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

British Airways and Aer Lingus are the most popular carriers operating from Portugal to Seattle/Tacoma Intl

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 45m on average. On the other hand, flying from Porto to Seattle takes 31h 15m 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 September 2025, there are 5 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.

$432 Cheap Flights from Portugal to Seattle in 2025/26

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Find the cheapest flights from Portugal to Seattle

Round-trip

One-way

Last minute

Recent round-trip flight deals from Portugal to Seattle

7:20 pm - 10:16 pmOPO-SEA

34h 56m2 stops

8:10 am - 11:40 amSEA-OPO

19h 30m2 stops

$707Multiple Airlines

Find Deal

Wed, Nov 5 - Wed, Nov 12

12:55 pm - 11:30 amLIS-SEA

30h 35m1 stop

1:35 pm - 2:50 pmSEA-LIS

17h 15m1 stop

$748British Airways

Find Deal

Thu, Nov 6 - Sat, Nov 22

10:55 am - 11:03 amLIS-SEA

31h 08m1 stop

11:42 am - 2:50 pmSEA-LIS

19h 08m2 stops

$754American Airlines

Find Deal

Thu, Oct 30 - Fri, Nov 14

5:00 am - 11:45 amLIS-SEA

14h 45m1 stop

11:25 am - 3:10 pmSEA-LIS

19h 45m2 stops

$762Delta

Find Deal

Thu, Nov 6 - Sat, Nov 22

5:00 am - 6:23 pmLIS-SEA

21h 23m2 stops

11:25 am - 3:10 pmSEA-LIS

19h 45m2 stops

$766Delta

Find Deal

Thu, Nov 6 - Sat, Nov 22

10:55 am - 10:16 pmLIS-SEA

18h 21m1 stop

11:20 pm - 9:05 amSEA-LIS

25h 45m1 stop

$767American Airlines

Find Deal

Thu, Oct 30 - Fri, Nov 14

6:35 am - 11:45 amOPO-SEA

37h 10m1 stop

3:00 pm - 10:25 pmSEA-OPO

23h 25m1 stop

$777KLM

Find Deal

Thu, Nov 6 - Thu, Nov 13

6:35 am - 11:45 amOPO-SEA

37h 10m1 stop

3:00 pm - 3:25 pmSEA-OPO

16h 25m1 stop

$783KLM

Find Deal

Thu, Nov 13 - Tue, Nov 18

5:05 am - 11:55 amLIS-SEA

14h 50m1 stop

11:40 pm - 9:20 amSEA-LIS

25h 40m2 stops

$868United Airlines

Find Deal

Fri, Oct 17 - Wed, Oct 22

5:05 am - 11:55 amLIS-SEA

14h 50m1 stop

8:00 am - 10:30 amSEA-LIS

18h 30m1 stop

$869United Airlines

Find Deal

Fri, Oct 17 - Thu, Oct 23

Iberia flights from Portugal to Seattle

Our best Iberia deals on Portugal to Seattle flight tickets

Iberia

Nov 13

OPO8:20 amPorto

22h 58m

2 stops

SEA11:18 pmSeattle/Tacoma Intl

Nov 17

SEA12:41 amSeattle/Tacoma Intl

22h 59m

2 stops

OPO7:40 amPorto

$772

Find similar

Iberia

Nov 4

LIS8:20 amLisbon Humberto Delgado

20h 58m

2 stops

SEA9:18 pmSeattle/Tacoma Intl

Nov 15

SEA12:59 amSeattle/Tacoma Intl

26h 51m

2 stops

LIS11:50 amLisbon Humberto Delgado

$815

Find similar

Iberia

Nov 4

LIS8:20 amLisbon Humberto Delgado

20h 58m

2 stops

SEA9:18 pmSeattle/Tacoma Intl

Nov 17

SEA6:50 pmSeattle/Tacoma Intl

20h 35m

2 stops

LIS11:25 pmLisbon Humberto Delgado

$819

Find similar

United Airlines flights from Portugal to Seattle

Our best United Airlines deals on Portugal to Seattle flight tickets

United Airlines

Oct 17

LIS5:05 amLisbon Humberto Delgado

14h 50m

1 stop

SEA11:55 amSeattle/Tacoma Intl

Oct 22

SEA11:40 pmSeattle/Tacoma Intl

25h 40m

2 stops

LIS9:20 amLisbon Humberto Delgado

$868

Find similar

United Airlines

Oct 17

LIS5:05 amLisbon Humberto Delgado

14h 50m

1 stop

SEA11:55 amSeattle/Tacoma Intl

Oct 23

SEA8:00 amSeattle/Tacoma Intl

18h 30m

1 stop

LIS10:30 amLisbon Humberto Delgado

$869

Find similar

United Airlines

Oct 17

LIS5:05 amLisbon Humberto Delgado

14h 50m

1 stop

SEA11:55 amSeattle/Tacoma Intl

Oct 23

SEA11:40 pmSeattle/Tacoma Intl

24h 40m

2 stops

LIS8:20 amLisbon Humberto Delgado

$871

Find similar

Fly from

Fly to

Route

Depart

Return

Price

PortoSeattle

OPO - SEA

OPOSEA

Porto

Wed 11/5

7:20 pm-10:16 pm

2 stops34h 56m

Seattle/Tacoma Intl

Wed 11/12

8:10 am-11:40 am

2 stops19h 30m

$707

LisbonSeattle

LIS - SEA

LISSEA

Lisbon Humberto Delgado

Thu 11/6

12:55 pm-11:30 am

1 stop30h 35m

Seattle/Tacoma Intl

Sat 11/22

1:35 pm-2:50 pm

1 stop17h 15m

$748

LisbonSeattle

LIS - SEA

LISSEA

Lisbon Humberto Delgado

Thu 10/30

10:55 am-11:03 am

1 stop31h 08m

Seattle/Tacoma Intl

Fri 11/14

11:42 am-2:50 pm

2 stops19h 08m

$754

LisbonSeattle

LIS - SEA

LISSEA

Lisbon Humberto Delgado

Thu 11/6

5:00 am-11:45 am

1 stop14h 45m

Seattle/Tacoma Intl

Sat 11/22

11:25 am-3:10 pm

2 stops19h 45m

$762

LisbonSeattle

LIS - SEA

LISSEA

Lisbon Humberto Delgado

Thu 11/6

5:00 am-6:23 pm

2 stops21h 23m

Seattle/Tacoma Intl

Sat 11/22

11:25 am-3:10 pm

2 stops19h 45m

$766

LisbonSeattle

LIS - SEA

LISSEA

Lisbon Humberto Delgado

Thu 10/30

10:55 am-10:16 pm

1 stop18h 21m

Seattle/Tacoma Intl

Fri 11/14

11:20 pm-9:05 am

1 stop25h 45m

$767

PortoSeattle

OPO - SEA

OPOSEA

Porto

Thu 11/6

6:35 am-11:45 am

1 stop37h 10m

Seattle/Tacoma Intl

Thu 11/13

3:00 pm-10:25 pm

1 stop23h 25m

$777

PortoSeattle

OPO - SEA

OPOSEA

Porto

Thu 11/13

6:35 am-11:45 am

1 stop37h 10m

Seattle/Tacoma Intl

Tue 11/18

3:00 pm-3:25 pm

1 stop16h 25m

$783

LisbonSeattle

LIS - SEA

LISSEA

Lisbon Humberto Delgado

Fri 10/17

5:05 am-11:55 am

1 stop14h 50m

Seattle/Tacoma Intl

Wed 10/22

11:40 pm-9:20 am

2 stops25h 40m

$868

LisbonSeattle

LIS - SEA

LISSEA

Lisbon Humberto Delgado

Fri 10/17

5:05 am-11:55 am

1 stop14h 50m

Seattle/Tacoma Intl

Thu 10/23

8:00 am-10:30 am

1 stop18h 30m

$869

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 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, December 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 $795. If you don’t want to visit Seattle in December, then you should wait until April to fly from Portugal, when ticket prices are also cheap, with an average price of $800.

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 $937 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 20% 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.

Search flight deals

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 September 2025, there are 5 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 7,391 reviews	Search British Airways flights
United Airlines	PriceFrom $738	Free Cancellation	Rating 7.4 8,926 reviews	Search United Airlines flights
Air France	PriceFrom $762	Free Cancellation	Rating 7.4 1,466 reviews	Search Air France flights
Delta	PriceFrom $775	Free Cancellation	Rating 7.9 7,974 reviews	Search Delta flights
KLM	PriceFrom $794	Free Cancellation	Rating 7.8 1,387 reviews	Search KLM flights

Leavenworth

Tacoma

SeaTac

Ocean Shores

Renton

Olympia

Lynnwood

Kent

Marysville

Puyallup

Federal Way

Kirkland

Tukwila

Shoreline

Lakewood

Centralia

Fife

Cle Elum

Redmond

Westport

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.