$270 Find Cheap Flights from Seattle to Portugal

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Seattle to Portugal departing on 1/14. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
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1 adult, Economy, 0 bags

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Cheap Flights from Seattle to Portugal

Cheapest round-trip prices found by our users on KAYAK in the last 72 hours
Lisbon
Lisbon1 stop$496
Porto
Porto2 stops$449
Ponta Delgada
Ponta Delgada1 stop$867
Faro
Faro1 stop$481
Funchal
Funchal1 stop$491
Lajes
Lajes2 stops$1,556
Lisbon
Lisbon1 stop$496
Porto
Porto2 stops$449
Ponta Delgada
Ponta Delgada1 stop$867
Faro
Faro1 stop$481
Funchal
Funchal1 stop$491
Lajes
Lajes2 stops$1,556

Book Cheap Seattle to Portugal Plane Tickets

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Seattle to Portugal that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Seattle to Portugal

Thu, Dec 4 - Thu, Dec 11
Multiple Airlines Logo
3:25 pm - 11:10 amSEA-OPO
35h 45m2 stops
Multiple Airlines Logo
2:05 pm - 1:20 pmOPO-SEA
31h 15m1 stop
$449Multiple Airlines
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Thu, Dec 4 - Thu, Dec 11
Multiple Airlines Logo
1:05 pm - 11:10 amSEA-OPO
38h 05m2 stops
Multiple Airlines Logo
2:05 pm - 1:20 pmOPO-SEA
31h 15m1 stop
$450Multiple Airlines
Find Deal
Thu, Dec 4 - Fri, Dec 12
Lufthansa Logo
3:40 pm - 11:40 pmSEA-OPO
48h 00m2 stops
Lufthansa Logo
6:30 am - 1:20 pmOPO-SEA
14h 50m1 stop
$477Lufthansa
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Fri, Dec 5 - Wed, Dec 10
Delta Logo
7:20 am - 10:30 amSEA-OPO
19h 10m2 stops
Delta Logo
11:15 am - 11:50 amOPO-SEA
32h 35m1 stop
$481Delta
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Thu, Dec 4 - Wed, Dec 10
Delta Logo
3:05 pm - 3:25 pmSEA-OPO
16h 20m1 stop
Delta Logo
11:15 am - 11:50 amOPO-SEA
32h 35m1 stop
$482Delta
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Thu, Dec 4 - Wed, Dec 10
Lufthansa Logo
3:40 pm - 11:40 pmSEA-OPO
48h 00m2 stops
Lufthansa Logo
6:00 am - 8:54 pmOPO-SEA
22h 54m2 stops
$485Lufthansa
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Mon, Mar 16 - Thu, Mar 26
United Airlines Logo
3:00 pm - 2:50 pmSEA-LIS
16h 50m1 stop
United Airlines Logo
5:00 am - 1:10 pmLIS-SEA
15h 10m1 stop
$496United Airlines
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Tue, Feb 17 - Sun, Feb 22
United Airlines Logo
11:59 pm - 11:40 amSEA-FAO
27h 41m2 stops
United Airlines Logo
1:30 pm - 12:10 pmFAO-SEA
30h 40m1 stop
$502United Airlines
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Fri, Dec 5 - Thu, Dec 11
British Airways Logo
6:50 pm - 7:00 pmSEA-OPO
16h 10m1 stop
British Airways Logo
5:35 pm - 11:30 amOPO-SEA
25h 55m1 stop
$530British Airways
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Fri, Feb 13 - Fri, Feb 20
British Airways Logo
1:35 pm - 5:55 pmSEA-LIS
20h 20m1 stop
British Airways Logo
7:05 am - 4:55 pmLIS-SEA
17h 50m1 stop
$582British Airways
Find Deal
Booking Insights

KAYAK's insights & trends for Seattle to Portugal flights

Get data-powered insights and trends into flights from Seattle to Portugal to help you find the cheapest flights, the best time to fly and much more.

What is the cheapest month to fly from Seattle to Portugal?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Seattle to Portugal, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Seattle to Portugal is January, when tickets cost $711 (return) on average. On the other hand, the most expensive months are June and December, when the average cost of round-trip tickets is $1,317 and $1,168 respectively.

What’s the cheapest day of the week to fly from Seattle to Portugal?

The average price of all round-trip flights from Seattle to Portugal clicked on KAYAK for each day over the last 12 months.

For Seattle to Portugal, Monday is the cheapest day to fly on average and Friday is the most expensive. Flying from Portugal back to Seattle, the best deals are generally found on Wednesday, with Saturday being the most expensive.

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

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Seattle to Portugal, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from Seattle to Portugal, you should book around 2 weeks before departure, which saves you about 29% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 16 weeks before departure.

Good to know

Low seasonFebruary
Cheapest flight$270
Best time to beat the crowds with an average 29% drop in price.
Most popular time to fly and prices are also 5% lower on average.
Flight from Seattle to Lisbon

FAQs - booking Portugal flights

  • Is it necessary to get a visa before flying from Seattle to Portugal?

    Since Portugal is a part of the Shenzhen area, there's no need to get a visa if you don't plan on staying for more than 90 days in this country or any other country in the area. It is important to remember to bring a valid passport that will remain valid for at least 90 days beyond your intended date of departure from Portugal.

  • What is the quickest way to get to Lajes Airport (TER)?

    You can travel on a one-stop flight that utilizes Alaska Airlines and Azores Airlines to go to the airport from Seattle Tacoma International Airport with a layover at Boston Logan International Airport. You can also utilize Delta Air Lines or JetBlue to make the trip between Seattle and Boston.

  • Is there anything for kids to do at the airport in Seattle before a flight?

    One of the best options to entertain kids during their stay at the airport before a flight to Portugal is to take them to the children's play area that has a location right across from the Seattle Taproom that you will find between the Central Terminal and the A gates at the airport. Most days at the airport, there's also something called City of Music that consists of live music performances that occur throughout the airport property.

  • What makes a good choice for a sustainable airline on this route?

    TAP Air Portugal has made sustainability a top priority, with a focus on reducing carbon emissions and promoting environmentally friendly practices. The airline is committed to investing in new, more fuel-efficient aircraft and has implemented a number of initiatives to reduce waste and promote recycling. TAP Air Portugal has also been recognized for its efforts in sustainability, including receiving the Eco-Innovation Award from the European Union in 2015 and being named the Most Efficient Airline in Europe by Air Transport World in 2018.

  • How does KAYAK find such low prices on flights from Seattle to Portugal?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Seattle to Portugal.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Seattle to Portugal?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight from Seattle to Portugal is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Seattle to Portugal?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly from Seattle to Portugal with an airline and back with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Seattle to Portugal?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying from Seattle to Portugal up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

  • What is the cheapest time of day to fly to Portugal?

    The cheapest time of day to fly to Portugal is generally in the evening, when round-trip flights cost $959 on average. Morning departures are around 8% more expensive than evening flights, on average. The most expensive time of day to fly to Portugal is generally in the afternoon, which is peak travel time and where the average cost of a ticket is $1,074.

Top tips for finding cheap flights to Portugal

  • One of the most frequent airport destinations in Portugal is the Humberto Delgado Airport (LIS). From Seattle Tacoma International Airport (SEA), one route choice is to travel on a one-stop flight aboard American Airlines with a layover at Philadelphia International Airport (PHL).
  • When you are looking for one of the quickest ways to get to Francisco Sá Carneiro Airport (OPO) from Seattle Tacoma International Airport, you can travel on a one-stop flight on Air Canada and Air Transat that has a layover at Montréal-Pierre Elliott Trudeau International Airport (YUL).
  • If your flight from Seattle Tacoma International Airport is aboard British Airways, you will find that this airline has a lounge location in the south satellite of the airport.
  • Travelers looking for the quickest way to make their way to Faro International Airport (FAO) from Seattle Tacoma International Airport will find that the one-stop flight or a combination of Air Canada and Air Transat that has a layover at Toronto Pearson International Airport (YYZ) is one of the best options.
  • When your goal is to reach the Aeroporto João Paulo II (PDL) from Seattle Tacoma International Airport, one option is to travel on a one-stop flight that utilizes Air Canada and Azores Airlines with a layover at Montréal-Pierre Elliott Trudeau International Airport.

Reviews of the top 5 airlines serving from Seattle to Portugal

 
Need help choosing which airline to fly with from Seattle to Portugal? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.9
DeltaOverall score based on 8001 reviews
7.9Comfort
7.9Entertainment
7.3Food
8.2Boarding
8.5Crew
Airline reviews

I truly love flying with Delta. They have always treated me with the upmost respect

10.0 ExcellentMAYRA, Nov 2025JFK - MIA
Read more Delta reviews

I truly love flying with Delta. They have always treated me with the upmost respect

Our flight attendant in FIRST CLASS was one of the worst I’ve ever had. She was not at all pleasant, nor particularly good at her service.

Everything went well and was good. Nothing exceptional, but no complaints either. Cheap seats are pretty comfortable.

Staff were friendly and happy. Delta could make sure passengers that don't have the app know of changes. Without Kayak I would not have known about the change of gate or the delay. Kayak was faster to notify me.

They ended up paying for the bag twice, but the counter wouldn't take my baggage receipt. Left it to me to resolve. Not sure how to resolve the issue.

The customer service before board was very rude and when I expressed my concerns about making the connecting flight she laughed and told me I bought the wrong ticket. I explained once it showed the flight was delayed it no longer let me change seats or anything. I was trying to upgrade to make sure I would get to the next gate on time.

Non stop on long haul is the way to go. Great experience

The aircraft interior is old and tired on this aircraft. The entertainment system never worked despite the crews attempt to reset the system.

The flight used a B767 with a very old interior from before 2014. The entertainment system did not work at all during the flight despite attempts to reset the system. It was like they flew this route just to be competitive.

Old plane and old configuration/seats but still comfortable for a morning flight

I don’t like that an equipment change caused my seat to change from 23A to 44A. The boarding was also delayed. The crew were excellent, however and very attentive. The food was not bad.

Worst airlines either. First leg was delayed because of crew not available. My connection was missed so they booked me automatically the next day! But, impossible to get anyone on site, web site does not let me access my reservation anymore, confirmed by useless agents over the phone. My 2-leg trip with part in business class arriving at 4:10pm ends up in an awful 3-leg arriving at 9pm the next day with no way to even choose the seats and of course at the very end of the plane. I can understand problems arrive but the way Air France handle it is just unacceptable. You are on your own. Apparently getting you to your destination is the only thing they consider their duty. The customer experience and fatigue is none of their concern. And I have a status with them. I will reconsider my priorities when flying with Air France and encourage everyone to do the same.

Our flight crew were terrific. And they handle a difficult passenger with finesse.

Excellent, Lima to Paris. But Paris to Amsterdam, delayed, missed my flight and KLM treated its missed flights passengers very badly, terribly bad. No hotel accommodation given. Passengers were told to find their own hotel accommodation and claim at reasonable rate and left the booth and literally with armed Police Officers listening to passengers complains. For three hours, after moving by Uber from hotel to hotel and calling and booking online, no hotel was available. I had to return to the airport and seat/sleep on the benches, suffering the cold, and rats running around until my new allocated flight the next day. It was the most terrible KLM treatment even seen and being a Business Class passenger. Still mentally suffering to date as a result.

3 hour delay but out of their control. App said I get vouchers but when I applied for them, they were nowhere to be found in my account

I bought business class tickets but the seats are exactly like economy with no comfort seats nor an empty seat next to me provided. Very poor, low quality airline.

I don't understand the concept of paying to get your personal luggage onboard and then asked to check it in.... either sell the space or don't, its a hassle to carry those all through the airport just to make a check in at the last minute.

The food was great and the service and attitude was amazing!!

It was a great experience. The only thing I would have changed was that the bathrooms were never cleaned and they got very dirty.

Old airplanes small seats expensive tickets, not as expected overall and not comfortable according to the price

Plane boarded early a quickly, was mostly full. We left close to on time. And landed early.

My experience on this United Airlines flight was highly uncomfortable, primarily due to two issues: Cabin Temperature: The temperature on the Boeing 737 MAX 8 was unacceptably high, feeling consistently around 80 degrees throughout the flight. This made sleeping impossible and significantly detracted from the experience. Seating Arrangement: Being stuck in a middle seat for a six-and-a-half-hour overnight flight compounded the discomfort. Moving forward, I will always purchase a seat assignment to avoid this situation.

Premium Plus is a really good idea for longer flights

7 hours delayed due to operational issues on United’s end. Basically laziness.

Short flight but an "eager to help" crew made the journey more enjoyable!

Flight was delayed only slightly before takeoff due to traffic control. However, the flight arrived early to ORD. Good flight. United has been very reliable for me.

The person I bought the ticket for didn’t make the flight.

Lately I like the planes have been exceptionally filthy. There’s lines of dust and dirt all across the ceiling in the vents, and the cracks in between the seats are literally full of food. It’s definitely not the quality of service that I was used to with United. I’m also very disappointed with the Wi-Fi! All I wanna do is knock out a few work jobs while I’m trapped in my seat And it spools so bad. They did provide me with a refund, but the process of getting that refund is so complicated. It’s unfortunate.

Another delayed flight. When the delays exceed the duration of the flight, it’s a problem.

Excellent flight. Smooth, efficient boarding. Quick flight. Arrived early at STL.

Trip was smooth, good drew, average meal, almost cold coffee. Excellent landing. Did not enjoy going down the stairs, walking to the gate, walking up the stairs, going a long walk to the exchange gate, and going down the stairs again to be bussed all the way where we originally landed to take our next flight! Over all an average experience. Thank you.

I booked extra leg room, due to seat neighbor i now consider extra shoulder and arm room as well. Seems like the seats shrink in width now The crew was very friendly and professional ( 100%). Food was good not great, breakfast was bad, a dry slice of bread would have been better. Facilities clean.

Luggage transfer in Chicago was not performed in time. I received my luggage at my destination two days later.

love the crews and my only problem was the delay at Frankfurt was very bad. I have travelled with Lufthansa for over 30 years now and this was cost me some planned business appointment

The flight delay made the connection a bit tight but that's outside the flight crew's control.

We just made it to our connecting flight. A long, long speed walk!

We didn't get the coffee with breakfast in the morning.. 30 mins lazer I asked flight attendant why don't we get coffee now at least.. after the breakfast..she said that captain announced possible turbulences fee minutes ago, which didn't ecplain why we didn't get it with the breakfast..breakfast was very poor btw..just little pastry which you can eat in 4 little bites. Turbulences fortunately didn't even happen.. but we didn't get that more than necessary coffee in the morning after the night flight with very poor sleep.. They just served breakfast 1 hour afzer we took off..at like 11 PM.. that doesn't make sense at all.. Also, flight attendants weren't very nice..they looked like they're not happy with their job.. :/

Lufthansa still has a good level of quality compared to US airlines, especially with respect to (1) food quality - actually tasty, (2) good French red wine - free, (3) good movie selection. Also my ticket price includes 1 free check-in luggage, while some other budget airlines sneak in an extra $150 for a checkin.

I think they overbooked Frankfurt to New York and bumped me off. This changed my return travel I arrived home about 4 hours late. Almost 24 total travel time Totally unacceptable Would not travel with United

We were moved twice on flights to the point we weren’t even on Lufthansa anymore. We had to fly united. Lost paid extra leg room twice. To top it all off we’re forced to pay $375 and $275, respectively for you luggage that was considered sports luggage. We were told it would be Lufthansa fares l, from the united desk, AND WE DIDN'T EVEN HAVE A LUFTHANSA FLIGHT! I’ll be calling once my trip is over on October 7th to all airlines and Kayak. This was ridiculous!

Airlines have to stop assuming passengers bring entertainment. Provide it like you used to in business class and above!! N

I don't know about the others but the flight attendant that took care of us had the absolute wrong approach "how do we dare asking for water or anything else for that matter"

Flying on the Boeing 787 from Seattle to London was everything that I expected. Every thing was great.

Not my definition of first class. No leg room and barely any recline. The food was good. The crew was great. The comfort for the price I paid for London to Cairo was highway robbery. The Wi-Fi didn't work for me either.

Seat pitch is not enough to eat comfortably. When seat in front is reclined, your screen comes closer to your face. Ryanair seats are actually more comfortable.

Horrible leg room - coach seating with empty seat in middle on a 3 across seating. You buy business class for comfort which includes leg room. Absolutely no entertainment options either. Awful experience

The leg from Portland to Heathrow was great for a business class ticket. The BA leg from Heathrow to Lisbon was terrible. Basically coach seating with an empty seat between you and next passenger. Absolutely no leg room. Should not have been charged for business class and it was a 3 hour flight.

The flat beds. Other than that, the place was not clean.

Moved me away from my family and refused to fix it.

I have always been pleased with their service. Would not change a thing

Everything you need to know for your flight from Seattle to Portugal

Information on your arrival and departure airports