$335 Find Cheap Flights from Portugal to Seattle

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight to Seattle departing on 4/27. 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.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to Seattle

 
These are the airlines KAYAK users have selected most often from within our search results for flights to Seattle, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results for flights to Seattle, as well as popular online travel agencies
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Flight Deals

Cheap Flights from Portugal to Seattle

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Portugal to Seattle 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 Portugal to Seattle

Fri, Apr 24 - Sat, May 9
Aer Lingus Logo
10:15 pm - 5:10 pm
LIS
-
SEA
26h 55m
1 stop
Aer Lingus Logo
7:10 pm - 9:35 pm
SEA
-
LIS
18h 25m
1 stop
$641Aer Lingus
Fri, Jun 5 - Fri, Sep 18
Scandinavian Airlines Logo
9:15 pm - 1:45 pm
LIS
-
SEA
24h 30m
1 stop
Scandinavian Airlines Logo
3:55 pm - 3:35 pm
SEA
-
LIS
15h 40m
1 stop
$735Scandinavian Airlines
Fri, Apr 24 - Sat, May 9
Multiple Airlines Logo
9:20 am - 10:50 pm
LIS
-
SEA
21h 30m
3 stops
Multiple Airlines Logo
7:00 pm - 11:30 pm
SEA
-
LIS
20h 30m
3 stops
$774Multiple Airlines
Fri, Apr 24 - Fri, May 1
Multiple Airlines Logo
9:25 am - 5:10 pm
LIS
-
SEA
15h 45m
1 stop
Multiple Airlines Logo
7:10 pm - 8:50 pm
SEA
-
LIS
17h 40m
1 stop
$796Multiple Airlines
Fri, Apr 24 - Sat, May 9
Multiple Airlines Logo
9:20 am - 10:50 pm
LIS
-
SEA
21h 30m
3 stops
Multiple Airlines Logo
7:00 pm - 10:05 pm
SEA
-
LIS
19h 05m
2 stops
$807Multiple Airlines
Fri, Jun 5 - Fri, Sep 18
Scandinavian Airlines Logo
9:15 pm - 1:45 pm
LIS
-
SEA
24h 30m
1 stop
Scandinavian Airlines Logo
3:55 pm - 3:35 pm
SEA
-
LIS
15h 40m
1 stop
$808Scandinavian Airlines
Fri, Jun 5 - Fri, Sep 18
Scandinavian Airlines Logo
9:15 pm - 11:53 pm
LIS
-
SEA
34h 38m
2 stops
Scandinavian Airlines Logo
3:55 pm - 3:35 pm
SEA
-
LIS
15h 40m
1 stop
$825Scandinavian Airlines
Wed, Apr 15 - Mon, Apr 20
Multiple Airlines Logo
6:10 am - 8:40 pm
LIS
-
SEA
22h 30m
2 stops
Multiple Airlines Logo
7:00 pm - 8:00 pm
SEA
-
LIS
17h 00m
2 stops
$834Multiple Airlines
Fri, May 1 - Mon, May 11
Delta Logo
5:00 am - 11:40 am
OPO
-
SEA
14h 40m
1 stop
Delta Logo
9:30 am - 10:40 am
SEA
-
OPO
17h 10m
2 stops
$887Delta
Sat, May 2 - Sat, May 30
Delta Logo
5:00 am - 2:42 pm
OPO
-
SEA
17h 42m
2 stops
Delta Logo
1:30 pm - 3:25 pm
SEA
-
OPO
17h 55m
1 stop
$888Delta
Booking Insights

KAYAK's insights & trends for flights to Seattle

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

What is the cheapest flight to Seattle?

These are the best round-trip prices found by users searching on KAYAK in the last 72 hours.

In the last 3 days, the cheapest flight deal to Seattle was found on the route from Porto, at $641 return. The most popular connection is from Los Angeles to Seattle and KAYAK users have found round-trip deals for as low as $77 in the last 3 days.

What is the cheapest month to fly to Seattle?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for flights to Seattle, 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 to Seattle is February, where tickets cost $825 on average for return flights. On the other hand, the most expensive months are January and July, where the average cost of tickets from Portugal is $1,326 and $1,211 respectively. For one-way flights, the best month to travel is February with an average price of $825.

Good to know

Low seasonFebruary
Cheapest flight$335
Best time to beat the crowds with an average 15% drop in price.
Most popular time to fly with an average 4% increase in price.
Flight from Porto to Seattle

FAQs - booking Seattle flights

  • What is the cheapest flight to Seattle?

    In the last 3 days, the cheapest flight deal to Seattle was found on the route from Porto, at $641 return. The most popular connection is from Los Angeles to Seattle and KAYAK users have found round-trip deals for as low as $77 in the last 3 days.

  • How far is Seattle/Tacoma Intl Airport from central Seattle?

    You’ll need to travel 11 miles to reach the Seattle city center from Seattle/Tacoma Intl Airport.

  • What is the name of Seattle’s airport?

    When flying to Seattle, you'll arrive at Seattle/Tacoma Intl Airport (SEA). The airport is also known as Seattle-Tacoma Intl, Seattle/Tacoma, or Seattle/Tacoma Intl.

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

    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 to Seattle.

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

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

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

    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 to Seattle 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 to Seattle?

    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 to Seattle up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

  • How many direct flights to Seattle are there each week?

    Each week there are around 3,663 direct flights from within Portugal to Seattle. The most common day for departures is Thursday, with 15% of flights taking off on this day.

Top tips for finding cheap flights to Seattle

  • Enter your preferred departure airport and travel dates into the search form above to unlock the latest Seattle flight deals.

Reviews of the top 3 airlines serving from Portugal to Seattle

 
See real verified KAYAK customer reviews for airlines flying to Seattle. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline from Portugal to Seattle. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with to Seattle? 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 8280 reviews
7.2Food
8.1Boarding
7.9Comfort
8.5Crew
7.8Entertainment
Airline reviews

Another late night flight and MORE men belligerently drinking and yelling. I had to move from first to economy because they were so obnoxious and disruptive. Crazy to go from a cozy chair to cardboard when you were supposed to be in first. Delta allows was too much drinking which leads to belligerent behavior.

2.0 MediocreIsabella, Mar 2026
SLC - AUS
Read more Delta reviews

Another late night flight and MORE men belligerently drinking and yelling. I had to move from first to economy because they were so obnoxious and disruptive. Crazy to go from a cozy chair to cardboard when you were supposed to be in first. Delta allows was too much drinking which leads to belligerent behavior.

I was in first class and literally the men behind me were so aggressively loud I moved myself to economy. This has become so common on Delta - people using audio without headphones, and men on 12am / late night flights drinking and yelling to talk to each other which prevents anyone around them from resting. Pretty crazy to have to move from first to economy (poorer service, less comfort...). Wild wild. Looking into other airlines.

Love delta smaller commuter plane so no entertainment and paid wifi on MKE-LGA leg was extremely unreliable and slow

Stop changing gates. Stop cancelling flights Stop moving my seat.

Extremely disappointed with Delta. They canceled flight last minute and then I rebooked the other flights and with which were delayed as well

Could not get my connecting flight boarding pass until four hrs before departure! Ver annoying especially since the staff could not explain why!

The flight was flying with 30% capacity. The flight my seat from preferred seating to back of the seat. Even though i can understand that this was to balance the flight weight. The flight attendance decided to do the serving near my seat and in the middle , their noices woke me up from sleep , when i realized that the service has ended and when they were going back asked for a coffee, for which they answered they have completed teh service in my location. That really upset me as they woke me up and also rejected the coffee i asked. I ended up landing with a headache, thanks to the crew that screwed up my travel

I wish the inflight entertainment system options were broader, but overall this was a fantastic crew and I can’t express how cheerful, welcoming, and attentive they were.

Delayed. Hot. Passenger next to me was so large I couldn’t move.

Everything was good except wifi and a leaking drink chiller. The floor was all wet and my bag was soaked. Did not notice until debarking. Have not heard back from Delta. Even though this was leg one of an international flight in first class, they denied access to their Sky Club - very disappointing!

The boarding was efficient. The entertainment system was a bit unstable but Air France has a good selection of movies.

They lost my bag and I still haven’t received it yet

They lost my bag and I still have not received it

Communication on the delay, rebooking and how to get a hotel was poor. Mails, airport check-in and transfer desk said different things.

Not consistent with the food quality (I mean taste not freshness)

Safe and stable made me sleepy and I slept and dreamt 😂😂😂😂

Food was really mediocre for premium economy in comparison to other airlines… the crew was nowhere to be found… 14 hour 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.

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.

I paid for a very expensive Business Class seat to and from Cairo Egypt from Charleston SC. There was partnership from states to London using American Airlines. That leg was amazing. The British Airlines leg was a joke. They used the standard no leg room 3 by 3 seats. A tray was put on the middle seat. The trip was 5 hours, from London to Cairo, thus my BC purchase. There was no screen proving tv/movie options, only a small device plug. The fold down tray and the bag of peanuts were typical of normal short run flying. The one toilet was located in the galley. We all got to know each other well. This was my first and last trip with British Airlines. I now understand why they would NEVER give me a seat chart so that I could make a selection.prior to departure. It honestly would not have made a difference, there were less than 50% of occupied seats. Apparently everyone got the memo but me. I have never felt so cheated as with that trip, got to so another going back to London, yeah. I will be sending a letter to customer service and asking for a refund. I will be photos comparing the two BC legs. OH, one more thing. The FC ticket holders got bulkhead and exit row seats. I know they had to be thrilled

Late takeoff, but on time landing. Lost bags, 3 days to find them, still in transit to my location. Power outlets broken, Wi-Fi not working, so much for working on the long flight.

Late! Late and late! More than 1hr 30mn. This sucks when it is the last of a 4 flight journey. I missed my dinner! Which is not nice on Valentine’s Day!!! But better than the gate next to us, the poor Chinese people were rebooked to the next day flight. AA had to call security as it became very heated with the passengers! It was a mess at DFW that afternoon/evening. I wish they had some food for the people who travel as part of international journey. Indigo does it in India and it is fantastic.

Good. For a long flight. The comfort of the seat could be better. Also, the food was « normal » plane food. Not indian plane food unfortunately! Everything else was smooth and great.

The seats were comfortable. So many empty seats allowed for stretching out and sleeping. The onboard entertainment was pretty good. The cabin crew were so kind and kept the passengers well- hydrated, and well fed.

We had American Airlines on our return and it was confusing if we were going with Aa or BA I had 2 different flight numbers and didn’t get our gate until it was boarding. So we were a bit nervous as the which it was

Our Jackson, Mississippi to Dallas Fort Worth flight was delayed on 1/19/26.. This was changed to Jackson to Charlotte in the last minute because of this delay. This started some kind of disconnect between American Airlines and British Airways bookings. We could not go past the passport control in London Heathrow. I had to go to the counter and waited for more than 30 minutes to get a new boarding pass. Problems did not end there. Somehow our entire return flight was canceled by someone. I had to make several phone calls over several days to fix the problem – this was not easy from India. Looks like there was some kind of disconnect between two airlines or some agent did not do it right. I’m anxious to know what went wrong.

My touch screen at my seat wasn't working, the films BA advertised on the website for this flight were not available, and the plane was a little dated, food was good and the staff were good, just let down by the aircraft facilities.

Did not like the seating configuration at all with 2+3+2 in business class. Lacking total privacy and comfort

The flight crew was kind, flexible, and accommodating. The seats on the plane were extremely uncomfortable.

Traveling to a place near Seattle?

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Everything you need to know for your flight to Seattle

Information on the airport you'll fly into in Seattle