$403 Find Cheap Flights from Portugal to Seattle - Compare and Save

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 9/21. 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 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

Sat, Sep 12 - Sat, Sep 26
Multiple Airlines Logo
6:10 am - 9:40 amLIS  Lisbon Humberto Delgado-SEA Seattle/Tacoma Intl
35h 30m2 stops Halifax Intl Calgary
Multiple Airlines Logo
10:30 am - 6:30 amSEA  Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado
36h 00m2 stops Calgary Montreal Pierre Elliott Trudeau Intl
$755Multiple Airlines
Sat, Sep 12 - Sat, Sep 26
Multiple Airlines Logo
6:10 am - 9:40 amLIS  Lisbon Humberto Delgado-SEA Seattle/Tacoma Intl
35h 30m3 stops Halifax Intl Toronto Pearson Intl Calgary
Multiple Airlines Logo
10:30 am - 6:30 amSEA  Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado
36h 00m2 stops Calgary Montreal Pierre Elliott Trudeau Intl
$769Multiple Airlines
Sat, Sep 12 - Sat, Sep 26
Multiple Airlines Logo
6:10 am - 9:40 amLIS  Lisbon Humberto Delgado-SEA Seattle/Tacoma Intl
35h 30m3 stops Halifax Intl Toronto Pearson Intl Calgary
Multiple Airlines Logo
7:35 pm - 9:35 amSEA  Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado
30h 00m3 stops Calgary Montreal Pierre Elliott Trudeau Intl Toronto Pearson Intl
$817Multiple Airlines
Sun, Oct 25 - Sun, Nov 1
Multiple Airlines Logo
7:45 am - 6:05 pmOPO  Porto-SEA Seattle/Tacoma Intl
17h 20m1 stop London Stansted
Multiple Airlines Logo
6:55 pm - 7:45 pmSEA  Seattle/Tacoma Intl-OPO Porto
16h 50m1 stop London Heathrow
$851Multiple Airlines
Sat, Sep 12 - Sat, Sep 26
Multiple Airlines Logo
6:10 am - 9:40 amLIS  Lisbon Humberto Delgado-SEA Seattle/Tacoma Intl
35h 30m2 stops Halifax Intl Calgary
Multiple Airlines Logo
7:10 pm - 9:55 pmSEA  Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado
18h 45m1 stop Dublin
$878Multiple Airlines
Sat, Sep 5 - Fri, Sep 18
Multiple Airlines Logo
7:00 am - 6:45 pmLIS  Lisbon Humberto Delgado-SEA Seattle/Tacoma Intl
43h 45m3 stops Madrid Barajas Halifax Intl Calgary
Multiple Airlines Logo
3:40 pm - 9:20 pmSEA  Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado
21h 40m2 stops Reykjavik Keflavik Intl London Gatwick
$902Multiple Airlines
Sat, Sep 19 - Sat, Oct 3
Aer Lingus Logo
10:15 pm - 5:10 pmLIS  Lisbon Humberto Delgado-SEA Seattle/Tacoma Intl
26h 55m1 stop Dublin
Aer Lingus Logo
7:10 pm - 9:35 pmSEA  Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado
18h 25m1 stop Dublin
$905Aer Lingus
Sat, Sep 5 - Fri, Sep 18
Scandinavian Airlines Logo
10:55 pm - 1:45 pmLIS  Lisbon Humberto Delgado-SEA Seattle/Tacoma Intl
22h 50m1 stop Kastrup Copenhagen
Scandinavian Airlines Logo
3:55 pm - 10:05 pmSEA  Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado
22h 10m1 stop Kastrup Copenhagen
$913Scandinavian Airlines
Tue, Sep 8 - Sun, Sep 13
Delta Logo
5:00 am - 11:47 amOPO  Porto-SEA Seattle/Tacoma Intl
14h 47m1 stop Amsterdam Schiphol
Delta Logo
1:30 pm - 3:30 pmSEA  Seattle/Tacoma Intl-OPO Porto
18h 00m1 stop Paris Charles de Gaulle
$963Delta
Sat, Sep 19 - Sat, Oct 3
Delta Logo
5:00 am - 11:47 amLIS  Lisbon Humberto Delgado-SEA Seattle/Tacoma Intl
14h 47m1 stop Amsterdam Schiphol
Delta Logo
7:15 am - 11:15 amSEA  Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado
20h 00m2 stops Chicago O'Hare Intl Paris Charles de Gaulle
$971Delta
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 February, where tickets cost $897 on average for return flights. On the other hand, the most expensive months are July and March, where the average cost of tickets from Portugal is $1,463 and $1,084 respectively. For one-way flights, the best month to travel is October with an average price of $742.

Good to know

Low season

February

Cheapest flight

$403
Best time to beat the crowds with an average 28% drop in price.
Most popular time to fly and prices are also 19% 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 13,044 direct flights from within Portugal to Seattle. The most common day for departures is Sunday, with 18% 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 8502 reviews
8.5Crew
8.1Boarding
7.8Comfort
7.2Food
7.8Entertainment
Airline reviews

One of the restrooms didn’t work. The ones that did never got replenished. Flight attendant just sitting there on their phone. No notification that the bathroom was broken so long lines. Apathetic crew.

4.0 OkayGow, Aug 2026
Read more Delta reviews

One of the restrooms didn’t work. The ones that did never got replenished. Flight attendant just sitting there on their phone. No notification that the bathroom was broken so long lines. Apathetic crew.

I am in a wheelchair The gate agent knew exactly how to boarding A wheelchair first also the flight attendant knew exactly what she was doing

They did everything right and everything happened right on time.

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.

Traveling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
Lynnwood
Centralia
Fife
Lakewood
Westport
Lacey
Mukilteo
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