$297 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 8/16. 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

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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
Lisbon2 stops$847
Porto
Porto2 stops$749
Faro
Faro2 stops$812
Funchal
Funchal2 stops$814
Ponta Delgada
Ponta Delgada1 stop$992
Lajes
Lajes2 stops$1,151
Lisbon
Lisbon2 stops$847
Porto
Porto2 stops$749
Faro
Faro2 stops$812
Funchal
Funchal2 stops$814
Ponta Delgada
Ponta Delgada1 stop$992
Lajes
Lajes2 stops$1,151

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

Tue, Nov 3 - Thu, Nov 19
Scandinavian Airlines Logo
7:20 am - 11:05 am
SEA
-
OPO
19h 45m
2 stops
Scandinavian Airlines Logo
5:50 pm - 12:18 am
OPO
-
SEA
38h 28m
2 stops
$749Scandinavian Airlines
Wed, Nov 4 - Wed, Nov 18
British Airways Logo
6:50 pm - 5:50 pm
SEA
-
OPO
15h 00m
1 stop
British Airways Logo
8:40 pm - 10:15 pm
OPO
-
SEA
33h 35m
2 stops
$771British Airways
Tue, Nov 3 - Tue, Nov 17
Iberia Logo
6:50 pm - 7:40 am
SEA
-
OPO
28h 50m
2 stops
Iberia Logo
9:55 pm - 4:55 pm
OPO
-
SEA
27h 00m
2 stops
$773Iberia
Wed, Nov 4 - Wed, Nov 18
British Airways Logo
2:46 pm - 5:50 pm
SEA
-
OPO
19h 04m
2 stops
British Airways Logo
8:40 pm - 10:15 pm
OPO
-
SEA
33h 35m
2 stops
$776British Airways
Sun, Nov 1 - Mon, Nov 16
Lufthansa Logo
3:15 pm - 9:50 am
SEA
-
LIS
34h 35m
2 stops
Lufthansa Logo
12:25 pm - 9:17 am
LIS
-
SEA
52h 52m
2 stops
$848Lufthansa
Wed, Oct 28 - Sun, Nov 8
Lufthansa Logo
3:50 pm - 1:20 pm
SEA
-
LIS
14h 30m
1 stop
Lufthansa Logo
5:00 am - 12:00 pm
LIS
-
SEA
15h 00m
1 stop
$858Lufthansa
Mon, Nov 2 - Mon, Nov 23
KLM Logo
2:35 pm - 1:50 pm
SEA
-
FAO
15h 15m
1 stop
KLM Logo
2:40 pm - 11:47 am
FAO
-
SEA
29h 07m
1 stop
$938KLM
Sun, Aug 16 - Tue, Oct 27
KLM Logo
5:45 pm - 7:30 pm
SEA
-
FAO
17h 45m
1 stop
KLM Logo
2:40 pm - 12:47 pm
FAO
-
SEA
29h 07m
1 stop
$971KLM
Sat, Jul 4 - Sat, Jul 11
United Airlines Logo
7:00 am - 12:50 pm
SEA
-
TER
22h 50m
2 stops
United Airlines Logo
7:05 am - 11:44 pm
TER
-
SEA
47h 39m
2 stops
$3,702United Airlines
Sat, Jul 4 - Sat, Jul 11
United Airlines Logo
7:00 am - 12:50 pm
SEA
-
TER
22h 50m
2 stops
United Airlines Logo
7:05 am - 2:39 pm
TER
-
SEA
38h 34m
3 stops
$4,610United Airlines
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 $339 (return) on average. On the other hand, the most expensive months are June and May, when the average cost of round-trip tickets is $744 and $641 respectively.

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 4 weeks before departure, which saves you about 25% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 7 weeks before departure.

Good to know

Low seasonJanuary
Cheapest flight$297
Best time to beat the crowds with an average 42% drop in price.
Most popular time to fly with an average 1% increase in price.
Flight from Seattle to Porto

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.

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 8445 reviews
8.5Crew
7.8Entertainment
7.2Food
7.8Comfort
8.1Boarding
Airline reviews

I continue to be satisfied with Delta’s excellent service out of LGA. The digit id works well and gets me through security in no time. Whenever possible, I choose Delta.

10.0 Excellentangela, May 2026
LGA - PBI
Read more Delta reviews

I continue to be satisfied with Delta’s excellent service out of LGA. The digit id works well and gets me through security in no time. Whenever possible, I choose Delta.

Was revoked with Jet Blue due to delay from Kenya Air

The Boarding process was great. Particularly since my wife and I require assistance. The flight attendants were amazing. We travel frequently; they honestly were a cut above. 😀

Enjoyed it very much. Especially liked the free WiFi that Delta offers.

Smooth flight. Left on time, and got in 15 minutes early. Onboard video was great

For some reason, TSA Atlanta didn’t have my bag on the flight on time and they don’t have to provide Delta a reason for that.

WiFi didn’t work on two of four planes. Flight attendants were not overly friendly or welcoming. Planes were extremely slow to board and deplane.

Delta does a great job with entertainment and free wifi. I can still be in touch with my colleagues while in the air.

Aside from a completely packed plane, I really have no complaints.

Bus to plane was delayed for no apparent reason and our luggage was still on the belt when they shut it off. Took about 20 minutes to turn it back on to get our luggage.

MY FAMILY'S LUGGAGE WAS LOST FROM ROME TO BARI. I WAS THE ONLY ONE THAT RECEIVED MY LUGGAGE FROM ROME TO BARI. AFTER DEPLANING IN BARI, WE WASTED A LOT OF TIME AT BAG CLAIMS LOST AND FOUND REPORTING THE CLAIM AND PLEADING FOR THE BAGS TO BE DELIVERED THE NEXT DAY. WE WERE TOLD THAT IT TAKES 3 DAYS MINIMUM TO DELIVER. MY DAUGHTER AND MY GIRLFRIEND NEEDED THEIR PERSONAL THINGS AND WE WERE STAYING 3 HOURS AWAY FROM THE BARI AIRPORT. WE HAD TO DRIVE 3 HOURS TO THE AIRPORT TO COLLECT OUR LOST LUGGAGE THE NEXT DAY. WE ARE NOT HAPPY WITH THE EXPERIENCE

We had a delay, but thankfully I made it to my connection. Overall it went smooth

The flight had a delay but I made it to my connection. Flight was smooth overall

As I wrote earlier, poor planning and/or communication. At least twice, we were told that we would be boarding in less than ten minutes, only to have the flight again delayed at least another hour.

This flight is a quick way to get to Chicago, but a bit expensive.

Very comfortable seating and the Flight staff were very attentive. The premium economy section that I was seated in was very clean, updated, and well appointed. I would highly recommend flying United Airlines as this experience was better than the Japan Airlines business class that I flew several months ago.

Our flight was canceled same day and we were never informed. Had to pay more and worse seating on another airline.

Our flight to Rome, Italy was cancelled the day of and we were never informed. We only found out because I was trying to get into my husbands account and called to get his account number. Had to pay more for worse seating on another airline.

My service dog and I were asked to deplane just before they closed the door - clearly very last minute they couldn’t find the documentation that I have filled out many many times before that is for flying service animals. I purposely purchase 3seats (a whole row) since he is large and not all passengers want to sit next to a dog on a cross country flight. The plane departed with my husband on it!!! They made me fill out a hard copy of the same form and had to reschedule me on a later flight where they could find 3 seats together!! I’ve done this so many times before - clearly the error was on their part in a technology glitch - but really people - do better!! Very traumatic - and my husband had to wait for us when he landed ….so bad. Poor pup was confused and tired.

First class ticket gets you no seat back entertainment? I have to bring my own laptop to see a movie? And most of their movies have ADS? No thank you. Worse: Tiny snacks only on a 2 hr flight?

On-time arrivals and departures. Crew helpful and friendly. Yet everything costs extra: seat selection, food, even airphones!

When you consider the price I ended up paying for everything. This was not a good deal! I had no idea that this airline had changed to a bargain basement no frills airline. So, it was disappointing to have to pay for every little thing. The only thing included was water and coffee. You have to pay for everything else! So I just felt nickel and dime.

I am not going to fillo this out for each leg of my trip. My first review holds for the experience

I had no idea that my ticket only paid for my right to get on the plane. They charged me $130 for my carry-on bag because it was 1 inch too big she claimed but it wasn’t! Then they wanted another fee for everything. I had no idea that Icelandair had changed to such a bargain basement airline. I was very disappointed.

Second time with Saga Premium, everything was fab, but the entertainment centre on both my flights didn't work, plus the seat on the NY to Rek flight (Airbus) was so solid and so uncomfortable. The 737Max flight's seat was much, much better.

I’m considering never flying with Iceland Air again. The seats in economy are torture. Now you only get water, coffee and tea for free- really? No food, not a single peanut. The passport line was insane, everyone was worried about catching their connecting flight. This was the third time I’ve barely made my connection, had to run. It can’t be that my choice is to use the bathroom (during the 50 minutes between flights) or make my flight. SO stressful! Ugh.

The staff was kind and helpful. There was no food, and you needed to bring your own earphones to use the entertainment, which I didn’t know.

They wouldn’t check in my luggage even though I had one checked bag prepaid. So I took my bag to the gate and tried to check it in there and two employees scolded me for bringing a large bag to the gate. I told them I was trying to check it in and that it was prepaid, and they said they couldn’t guarantee that it would arrive at my destination but they finally let me drop it off when boarding the plane and pick it up right after exiting the plane. There was no food, and there was no entertainment.

Delays at check-in, seemed like they were short ground staff at the time and some passengers needed extra processing.

Problems checking in both on the laptop and on the app. No free seating available at check-in as advertised - must pay for EVERY seat between $23 and $75. No way to cancel seat choice. App menus and site menus are not responsive, and some items are impossible to find. Crew and mobile assistance are friendly and helpful.

Good food, overall very comfy. The flight was full so obviously not optimal, but it is what it is.

Perfect airline, super friendly, great service, tasty food. Would fly again.

Parents with permanently crying baby on board. Neither parents nor crew did anything to calm the baby. The food was extremely disappointing. Seafood stew was very, very small! Not even appetizer size! Seat had a gap in the back. Had to use a pillow to fill it.

Food choices limited & not enticing Seats quite uncomfortable & difficult to control

Definitely get premium economy on a flight this long if you can. Your legs and while body will thank you.

Flight was delayed by several hours and then cancelled due to weather. But Staff was very helpful getting me on a different flight. United should offer food coupons and tooth brush and paste for stranded passengers

I upgraded to the business class cabin. It was the poorest business class I have ever experienced. No access to any business lounge in Tampa airport. Seats are not comfortable. I had a window seat and had to step/crawl over the next seat. Food was mediocre and service below average for business class. Bathroom location was ridiculous. No place to wait. I cannot believe I paid this kind of money and will never fly Lufthansa Discover again. They really should reimburse me somehow.

Boarding was disorganized. The door to one to the toilets wouldn’t lock. The plane was shockingly cramped, and clearly used for domestic flights due to the menus for items to sell domestic travelers. United should be ashamed of its small seats, tiny unclean toilets, and money grubbing stance toward services, compared to Lufthansa, Emirates, and most international carriers United is awful.

Was never allowed on and not refunded the full amount of the ticket plus charged a $300 processing fee.

Terrible. Lost our luggage for 4 days. Did not advise passengers there was a strike in Barcelona Airport and had zero personnel on hand at airport to advise passengers on where to go to file claims. We had to fend for ourselves. No assistance at all other than an online claims submission process that we had to find out about on our own.

24 hour delays aren’t even heard in 3rd world countries with archaic transportation systems. I’m never flying American Airlines again.

3.5 hr delay leaving Pittsburgh, notifications for which were incomplete and untimely. Connecting flight was automatically switched to one requiring more than a 30 hour layover! After waiting in a long queue, customer service reduced layover to 11 hours and also set up an earlier standby. The standby had empty seats, but the gate agent couldn't change our tickets! On top of all that my luggage was lost and has yet to even be located, much less returned 5 (FIVE!) days later. Too bad there's no rating below poor.

Canceled flight late London to Florence. Help at airport very poor. Treated poorly. Had to sleep in the airport. Lost bags- still do not have them. Horrible. I should be reimbursed!

The seats are extra cramped if you are taller than 5’8! Spring for the extra legroom seats for sure if you have a long flight!

Very disappointed with British Airways. It has been over 24 hours and I still have not received my checked baggage or any proper update. Customer support has been unresponsive, making the situation even more frustrating. Poor baggage handling and lack of communication seriously impacted my travel experience.

All the above categories was great. Seats entirely too cramped.

Flight was good but temp in the cabin was cold.

Departure was delayed leading to late arrival, 25 min wait for a gate. Basically, missed all our connections & had to be rebooted, which was a very long process.

I like American Airlines and their safety record. They provide quality service and a feel safe enough to prefer American Airlines over other carriers even if I have to pay a little more.

Good flight, no turbulence. I felt safe and comfortable which is really important when I am just a passenger.

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

Information on your arrival and departure airports