$301 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 5/4. 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
Lisbon1 stop$720
Porto
Porto1 stop$737
Faro
Faro1 stop$867
Funchal
Funchal1 stop$978
Ponta Delgada
Ponta Delgada3 stops$918
Lajes
Lajes2 stops$1,104
Lisbon
Lisbon1 stop$720
Porto
Porto1 stop$737
Faro
Faro1 stop$867
Funchal
Funchal1 stop$978
Ponta Delgada
Ponta Delgada3 stops$918
Lajes
Lajes2 stops$1,104

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

ศ., ต.ค. 2 - ส., ต.ค. 10
Multiple Airlines Logo
3:55 pm - 8:40 pm
SEA
-
LIS
20h 45m
1 stop
Multiple Airlines Logo
4:25 pm - 1:45 pm
LIS
-
SEA
29h 20m
1 stop
$720Multiple Airlines
ส., ส.ค. 22 - พฤ., ก.ย. 3
Scandinavian Airlines Logo
3:55 pm - 5:05 pm
SEA
-
OPO
17h 10m
1 stop
Scandinavian Airlines Logo
11:50 am - 1:45 pm
OPO
-
SEA
33h 55m
1 stop
$737Scandinavian Airlines
ศ., ต.ค. 2 - ส., ต.ค. 10
Multiple Airlines Logo
3:55 pm - 8:40 pm
SEA
-
LIS
20h 45m
1 stop
Multiple Airlines Logo
4:25 pm - 1:45 pm
LIS
-
SEA
29h 20m
1 stop
$738Multiple Airlines
อ., ต.ค. 6 - อ., ต.ค. 20
Turkish Airlines Logo
7:10 pm - 11:20 pm
SEA
-
LIS
20h 10m
1 stop
Turkish Airlines Logo
5:55 am - 5:15 pm
LIS
-
SEA
19h 20m
1 stop
$744Turkish Airlines
พ., ต.ค. 7 - ศ., ต.ค. 23
British Airways Logo
1:30 pm - 7:05 pm
SEA
-
OPO
21h 35m
1 stop
British Airways Logo
8:20 am - 12:15 am
OPO
-
SEA
23h 55m
2 stops
$795British Airways
พ., ต.ค. 21 - พ., ธ.ค. 16
United Airlines Logo
7:00 am - 9:45 am
SEA
-
OPO
18h 45m
1 stop
United Airlines Logo
12:30 pm - 12:14 am
OPO
-
SEA
19h 44m
2 stops
$812United Airlines
จ., มิ.ย. 1 - พ., มิ.ย. 10
KLM Logo
1:55 pm - 7:25 pm
SEA
-
FAO
21h 30m
1 stop
KLM Logo
8:20 pm - 4:24 pm
FAO
-
SEA
28h 04m
1 stop
$972KLM
จ., ต.ค. 5 - อา., ต.ค. 11
KLM Logo
1:45 pm - 9:35 am
SEA
-
FNC
35h 50m
1 stop
KLM Logo
6:40 pm - 11:52 am
FNC
-
SEA
25h 12m
1 stop
$985KLM
จ., ต.ค. 5 - อ., ต.ค. 13
British Airways Logo
1:30 pm - 6:35 pm
SEA
-
FNC
21h 05m
1 stop
British Airways Logo
7:35 pm - 11:35 am
FNC
-
SEA
24h 00m
1 stop
$996British Airways
อ., ก.ย. 15 - อ., ก.ย. 29
Air Canada Logo
10:30 am - 11:15 pm
SEA
-
TER
29h 45m
3 stops
Air Canada Logo
7:05 am - 10:42 pm
TER
-
SEA
22h 37m
3 stops
$9,588Air Canada
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 $606 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 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 2 weeks before departure.

Good to know

Low seasonJanuary
Cheapest flight$298
Best time to beat the crowds with an average 41% drop in price.
Most popular time to fly with an average 2% 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 8465 reviews
8.1Boarding
7.8Entertainment
7.2Food
7.9Comfort
8.5Crew
Airline reviews

The flight was operated by Latam. The aircraft had a technical issue and the flight was delayed for the next day. They grounded other passengers to get their airplane assigned to my flight. Most of he ground staff don't speak English (Orlando Airport), but were very polite.The crew on the other hand could speak English and Portuguese. On board service was good.

6.0 GoodSilvestre, Apr 2026
MCO - GRU
Read more Delta reviews

The flight was operated by Latam. The aircraft had a technical issue and the flight was delayed for the next day. They grounded other passengers to get their airplane assigned to my flight. Most of he ground staff don't speak English (Orlando Airport), but were very polite.The crew on the other hand could speak English and Portuguese. On board service was good.

The agent at check in and at the gate were less than thrilled to be at work. I'm not a fan of Kayak's placement on the plane. I got put in the middle seat and none of my preferences were used.

In ATL they have two sets of departure screens. Follow what is on your airline's departure board - the ATL Airport Authority departure board had completely incorrect details about the gate assignment for my flight, which would have made me miss boarding.

Flight was delayed it was hot while sitting on the plane, one engine was working on the plane until they had to do some jimmy rigging down the runway in order for the other engine to charge up. It was ridiculous

The flight was very good and the staff was very friendly and helpful!

The only thing I would say is we tried to get on a standby earlier flight, but with our fair we couldn’t. That seems senseless to leave with open seats..

Very easy to use and convenient, you can perform any action within the same portal

In a world of delays, Delta was on time both ways! Boarding was fast and efficient. Staff was friendly. AND wifi worked.

WiFi didn’t work. Flight delayed 3 hours Crew members were illiterate Seat lean back did not work.

Flight was delayed, we could have been notified earlier and in a consistent manner. App was not refreshing for another passenger to get the latest flight status. We could have stayed and waited at the hotel instead of waiting at the airport had we known the flight was going to delayed for more than 5 hours. The toilet is too tight, and needs to be cleaned more frequently (every hour). The entertainment screen froze, the touch screen not responding to touch. We were upgraded to comfort, it is more comfortable than regular economy seats.

Some crew were unfriendly or in some cases just straight up rude.

Booked through Kayak Business, had a seat in middle and towards back due to booking rate, not comfortable.

Was great in general, try to respect time and excuses when slight changes have been made, appreciated!

A long delay. Don't travel late in the day.

Super friendly with lots of drink options an entertainment. Friendly crew.

Standard flight with a drinks and a snack- overall very quick flight. The flight attendants were very strict, bordered on rude.

Outstanding service, efficient & friendly crew, flight was safe, comfortable & on time

United Airline crews were very friendly and very attentive. 12 hours flight was gone like in a shorter one.

Delayed - weather wasn't bad at either end. Also sat on tarmac in ORD.

Food was surprisingly delicious. Space in the seat is horrible when the seating front is reclined. Movie offerings were terrible. Crew was friendly and helpful.

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.

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.

Food - Non-Existent. You pay for everything. It is strictly Pay-to-Play!

The Experience Was Torture Spend a few extra dollars and avoid Icelandair at all costs. There is absolutely no refreshments, no food, no drinks. Only water, coffee, tea are free and at only half a tiny cup. Entertainment is limited selection of films, shows and mostly outdated. The seats are smaller than usual, with no cushion, no pillows, no blankets. First time in my life have I witness an airline asking for donations in spare change for a charity. With all the money Icelandair saves by starving the passenger, they can afford to give this charity on their own.

Never again. Terrible hospitality and human decency for an international flight. No food, no snacks, no beverages, blankets, pillows, limited entertainment. Tiny seats without any cushion and some do not even recline. I was shocked that they did not charge for seat belts. Never in my life have I witness asking for "spare change" for charity before landing on both legs of the flight. Icelandair can contribute on their own to said, so called, children's charity with the money saved from providing 3 centimeters of tea and water to hungry and dehydrated passengers.

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.

Lufthansa cancelled our flight from Los Angeles to Naples Italy on March 10 for scheduled flight on March 12 Very stressful experience trying to arrange alternatives. Will never fly again with Lufthansa

Everything could have been better. What needed to be wrong with United went wrong

The staff was bit rude when I asked for an extra drink after one beer, asked for one wine glass.

Very good, i got two seats for myself, and was comfortable with the blanket i got

I hated the FRA Airport. Confusing signage, including the path to Immigration and Security It seems that the airport grew haphazardly over the years. I have been through multiple WW Hubs with much better experiences.

Boarding was orderly, pilot and flight attendants were nice, entertainment options were good, and low sodium meals were quite tasty.

The whole experience was excellent, O can say out from Miami the best airline to travel with for any European destination. Since the ground staff to the inflight crew attention was great, service on board 10 of 10. Finally the 380 is very confortable and nice to travel.

All crew except 1 were excellent. When I asked assistance with business class seat conversion to a bed (not being familiar as never used before but have numerous times with other airlines) crew member helped very reluctantly. I should have told her that business class seat conversion is totally different in each airline such as Delta, New Zealand Air and United. Sorry it was my 1st time with America Airlines. Now I know, I won't bother asking assistance in future.

1st class seats NOT REALLY 1st class or business class but like premier economy. Should be listed as such or named something else. I have flown 1st class with other airlines and they are nothing like it at all.

The seats in Premier Economy were very comfortable. The food was better than average. The way British Airways handled our seating was atrocious.

Worst airline in the world. They downgraded me from business class to economy with no compensation.

Flight delayed, connection was not at gate listed and so missed, staff were rude at Heathrow, phone tree stupid and difficult, took me 21 actual hours to reach my destination. Almost lost my hotel reservation after walking in a strange city alone after midnight because they would not put me up in a hotel at sfo or heathrow. I will never fly BA again and will tell all people and Instagram followers never to fly BA.

Overall ok. Best part has always been the sundae dessert.

Check-in in SAN was long. ORD was good. Flight delayed On board crew was ok. No warmth or personality. LHrR barely made connection

Even if you wait for connecting passengers you should not be an hour late departing waiting their luggage. Your passengers may have connections in the other end and you harm them.

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

Information on your arrival and departure airports