$334 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 9/24. 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

Mon, Nov 23 - Sat, Jan 9
Virgin Atlantic Logo
10:00 am - 7:23 pm
LIS
-
SEA
17h 23m
1 stop
Virgin Atlantic Logo
6:00 am - 8:00 am
SEA
-
LIS
18h 00m
2 stops
$449Virgin Atlantic
Mon, Aug 24 - Mon, Aug 31
Multiple Airlines Logo
6:15 am - 9:40 am
LIS
-
SEA
35h 25m
2 stops
Multiple Airlines Logo
3:40 pm - 6:55 pm
SEA
-
LIS
19h 15m
2 stops
$684Multiple Airlines
Mon, Aug 24 - Mon, Aug 31
Multiple Airlines Logo
6:15 am - 9:40 am
LIS
-
SEA
35h 25m
2 stops
Multiple Airlines Logo
3:40 pm - 11:00 pm
SEA
-
LIS
23h 20m
3 stops
$710Multiple Airlines
Tue, Sep 15 - Tue, Oct 20
Multiple Airlines Logo
6:15 am - 9:40 am
LIS
-
SEA
35h 25m
2 stops
Multiple Airlines Logo
9:45 pm - 3:15 pm
SEA
-
LIS
33h 30m
1 stop
$780Multiple Airlines
Tue, Sep 15 - Fri, Oct 16
Multiple Airlines Logo
6:15 am - 9:40 am
LIS
-
SEA
35h 25m
2 stops
Multiple Airlines Logo
7:10 pm - 8:50 pm
SEA
-
LIS
17h 40m
1 stop
$781Multiple Airlines
Fri, Aug 21 - Fri, Sep 4
Scandinavian Airlines Logo
8:55 pm - 1:45 pm
LIS
-
SEA
24h 50m
1 stop
Scandinavian Airlines Logo
3:55 pm - 10:05 pm
SEA
-
LIS
22h 10m
1 stop
$846Scandinavian Airlines
Mon, Nov 23 - Sat, Jan 9
Delta Logo
5:00 am - 11:47 am
OPO
-
SEA
14h 47m
1 stop
Delta Logo
1:40 pm - 10:35 am
SEA
-
OPO
12h 55m
1 stop
$861Delta
Fri, Oct 16 - Tue, Oct 20
American Airlines Logo
11:05 am - 10:51 pm
LIS
-
SEA
19h 46m
1 stop
American Airlines Logo
1:30 pm - 3:35 pm
SEA
-
LIS
18h 05m
1 stop
$865American Airlines
Mon, Nov 23 - Sat, Jan 9
Delta Logo
5:00 am - 6:55 pm
OPO
-
SEA
21h 55m
2 stops
Delta Logo
7:20 am - 10:35 am
SEA
-
OPO
19h 15m
2 stops
$867Delta
Mon, Sep 14 - Mon, Sep 21
Iberia Logo
8:40 pm - 9:36 pm
OPO
-
SEA
32h 56m
2 stops
Iberia Logo
1:38 pm - 8:00 pm
SEA
-
OPO
22h 22m
2 stops
$906Iberia
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 month to fly to Seattle?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip 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 September, where tickets cost $553 on average for return flights. On the other hand, the most expensive months are July and January, where the average cost of tickets from Portugal is $1,040 and $870 respectively. For one-way flights, the best month to travel is May with an average price of $501.

Good to know

Low seasonFebruary
Cheapest flight$334
Best time to beat the crowds with an average 27% drop in price.
Most popular time to fly and prices are also 17% lower on average.
Flight from Lisbon to Seattle

FAQs - booking Seattle flights

  • 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 13,620 direct flights from within Portugal to Seattle. The most common day for departures is Sunday, with 17% 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 airline flying 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.
7.8
DeltaOverall score based on 8455 reviews
7.8Entertainment
7.2Food
8.5Crew
7.8Comfort
8.1Boarding
Airline reviews

Not really a “Delta” problem but worth mentioning: Boarding was a difficult process. TSA seemed understaffed and Pre-Check took longer than regular TSA. The supervisor was frazzled and yelled at travelers. Once through TSA, we had to put our carry-ons through another x-ray machine. Then queue up to board with both boarding pass and ID. Then, when we got to the stairs on the tarmac, we had to show our boarding pass again. Maybe this is just normal for Kona since the terminal is outdoors (but still a “secured” area).

6.0 GoodMary, Jun 2026
KOA - SEA
Read more Delta reviews

Not really a “Delta” problem but worth mentioning: Boarding was a difficult process. TSA seemed understaffed and Pre-Check took longer than regular TSA. The supervisor was frazzled and yelled at travelers. Once through TSA, we had to put our carry-ons through another x-ray machine. Then queue up to board with both boarding pass and ID. Then, when we got to the stairs on the tarmac, we had to show our boarding pass again. Maybe this is just normal for Kona since the terminal is outdoors (but still a “secured” area).

Checkin was good, fllight ws good. Onlly complaint is lack of foot on 6 hour flight from Seattle to Boston. Snacks were flimsy - chips and cookies. could have offered something more substantial for such a long flight. I know you can buy food in airport but for the price you pay for a ticket, they should step up for the passengers.

Much better than I expected. I had an economy ticket so I was really happy the flight was so comfy and the service so generous. Passengers were all polite too.

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.

It was fine. 55 minute flight. No snacks or beverage service offered. Boarding went smoothly and my walker was waiting for me on the jet way.

My flight was cencaled due with the bad weather on Sunday the crew was poorly mistaken my luggage supposed depart with my flight instead I didn’t have my luggage for almost 3 days the website is poorly respond to my complain until I have someone to do it my connection smooth their not even respon or email me even the have my luggage

8 hours late and the plane smelled like urine, that smell in the morning when your child wet the bed in the night.

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!

Prior to takeoff, the pilot told us there was a possibility of not being able to land and going to Portland. Well that happened, we took off and then did 8 loops around Spokane before the pilot told us we ran out of fuel and had to go to Portland. So for a 35 minute flight we have now been on the plane for 3 hours (boarded at 6:50 am and landed in Portland at 10:30). Then, we just sat in Portland's airport with no updates of when we can start heading back. All of a sudden, our pilots and crew just left, leaving us stranded in a different city and state. We continued to sit in Portland until we finally got a new crew assigned and boarded the plane (This was from 10:30-2). We then sat on the plane for an additional hour before take off because they had to count us multiple times. We finally landed in Spokane at 3:55 PM. So a flight that should have taken at max an hour took us 10 hours and we missed the majority of the recruiting event we went for.

Staff was great! Kind and cordial! Middle seat row 28 seat B has a hump in it. Trays were getting stuck when putting down and up. Good flight

Traveling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
Lynnwood
Centralia
Fife
Lakewood
Mukilteo
Westport
Lacey
Woodinville
Poulsbo
Edmonds
Aberdeen
DuPont
Shoreline
Monroe
Castle Rock
Edgewood

Everything you need to know for your flight to Seattle

Information on the airport you'll fly into in Seattle