$417 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 5/19. 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, May 15 - Sat, May 30
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
$718Aer Lingus
Fri, May 15 - Sat, May 30
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
$730Aer Lingus
Fri, May 15 - Sat, May 30
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
$793Aer Lingus
Wed, Jun 3 - Mon, Jun 8
Multiple Airlines Logo
7:10 pm - 5:55 pm
LIS
-
SEA
30h 45m
3 stops
Multiple Airlines Logo
3:40 pm - 8:30 am
SEA
-
LIS
32h 50m
3 stops
$807Multiple Airlines
Thu, Oct 1 - Sat, Oct 10
Icelandair Logo
3:00 pm - 8:40 pm
LIS
-
SEA
13h 40m
1 stop
Icelandair Logo
3:40 pm - 1:50 pm
SEA
-
LIS
14h 10m
1 stop
$840Icelandair
Wed, Jun 3 - Mon, Jun 8
Multiple Airlines Logo
7:10 pm - 5:55 pm
LIS
-
SEA
30h 45m
3 stops
Multiple Airlines Logo
3:40 pm - 6:55 pm
SEA
-
LIS
19h 15m
2 stops
$849Multiple Airlines
Tue, May 12 - Tue, May 26
Multiple Airlines Logo
6:30 am - 9:40 am
LIS
-
SEA
35h 10m
2 stops
Multiple Airlines Logo
3:40 pm - 10:05 pm
SEA
-
LIS
22h 25m
2 stops
$856Multiple Airlines
Mon, May 11 - Sun, May 24
WestJet Logo
6:15 am - 9:40 am
LIS
-
SEA
35h 25m
2 stops
WestJet Logo
10:30 am - 9:45 pm
SEA
-
LIS
27h 15m
2 stops
$874WestJet
Fri, May 8 - Tue, May 12
Delta Logo
5:00 am - 4:30 pm
OPO
-
SEA
19h 30m
1 stop
Delta Logo
6:40 pm - 10:05 pm
SEA
-
OPO
19h 25m
1 stop
$957Delta
Mon, May 11 - Mon, May 18
Delta Logo
5:00 am - 4:30 pm
OPO
-
SEA
19h 30m
1 stop
Delta Logo
7:30 am - 10:40 am
SEA
-
OPO
19h 10m
2 stops
$965Delta
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 Lisbon, at $718 return. The most popular connection is from Los Angeles to Seattle and KAYAK users have found round-trip deals for as low as $101 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$417
Best time to beat the crowds with an average 19% drop in price.
Flight from Lisbon 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 Lisbon, at $718 return. The most popular connection is from Los Angeles to Seattle and KAYAK users have found round-trip deals for as low as $101 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 10,876 direct flights from within Portugal to Seattle. The most common day for departures is Sunday, with 16% 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.
7.9
DeltaOverall score based on 8467 reviews
8.1Boarding
8.5Crew
7.9Comfort
7.8Entertainment
7.2Food
Airline reviews

Round trip flight to Canada and back to the US was smooth and efficient.

8.0 ExcellentBrent, Apr 2026
YWG - MSP
Read more Delta reviews

Round trip flight to Canada and back to the US was smooth and efficient.

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.

Spanish speaker flight attendants were incredibly rude. A male flight attendant named Allen, grabbed my bag out of the overhead bin and moved it without my permission. When I asked what he was doing, he informed me that the overhead bins were public space? It would be easy to ignore this comment, as you don’t know the whole story, but the flight attendants were militant and rude. Delta, you can do better!

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.

My business class seat was inoperable and unable to recline for 10 hour 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
Edmonds
Aberdeen
Poulsbo
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