$399 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 6/21. 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

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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Booking Insights
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

Thu, Aug 27 - Sat, Sep 12
Multiple Airlines Logo
6:10 am - 9:07 pm
LIS
-
SEA
22h 57m
3 stops
Multiple Airlines Logo
3:40 pm - 10:50 pm
SEA
-
LIS
23h 10m
2 stops
$749Multiple Airlines
Thu, Aug 27 - Sat, Sep 12
Multiple Airlines Logo
6:10 am - 9:00 pm
LIS
-
SEA
22h 50m
2 stops
Multiple Airlines Logo
3:40 pm - 10:50 pm
SEA
-
LIS
23h 10m
2 stops
$783Multiple Airlines
Sat, Jun 20 - Tue, Jul 14
WestJet Logo
6:10 am - 9:40 am
LIS
-
SEA
35h 30m
2 stops
WestJet Logo
7:00 am - 9:45 pm
SEA
-
LIS
30h 45m
3 stops
$808WestJet
Sat, Jun 20 - Tue, Jul 14
Multiple Airlines Logo
6:10 am - 9:00 pm
LIS
-
SEA
22h 50m
2 stops
Multiple Airlines Logo
3:40 pm - 7:55 pm
SEA
-
LIS
20h 15m
2 stops
$818Multiple Airlines
Thu, Aug 27 - Sat, Sep 12
Multiple Airlines Logo
6:10 am - 9:00 pm
LIS
-
SEA
22h 50m
2 stops
Multiple Airlines Logo
7:10 pm - 9:55 pm
SEA
-
LIS
18h 45m
1 stop
$823Multiple Airlines
Thu, Sep 17 - Mon, Sep 21
American Airlines Logo
12:25 pm - 11:58 pm
OPO
-
SEA
19h 33m
2 stops
American Airlines Logo
3:41 pm - 11:45 am
SEA
-
OPO
36h 04m
2 stops
$891American Airlines
Thu, Sep 17 - Mon, Sep 21
American Airlines Logo
12:25 pm - 11:58 pm
OPO
-
SEA
19h 33m
2 stops
American Airlines Logo
3:41 pm - 11:45 am
SEA
-
OPO
36h 04m
2 stops
$894American Airlines
Fri, Oct 16 - Sun, Oct 18
Air Canada Logo
6:00 am - 6:32 pm
OPO
-
SEA
20h 32m
2 stops
Air Canada Logo
10:30 am - 6:15 pm
SEA
-
OPO
23h 45m
2 stops
$983Air Canada
Thu, Sep 17 - Mon, Sep 21
United Airlines Logo
6:00 am - 8:18 pm
OPO
-
SEA
22h 18m
2 stops
United Airlines Logo
7:30 am - 9:45 am
SEA
-
OPO
18h 15m
1 stop
$984United Airlines
Thu, Sep 17 - Mon, Sep 21
United Airlines Logo
6:00 am - 8:43 pm
OPO
-
SEA
22h 43m
2 stops
United Airlines Logo
7:30 am - 9:45 am
SEA
-
OPO
18h 15m
1 stop
$986United Airlines
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 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 $1,214 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$395
Best time to beat the crowds with an average 19% drop in price.
Most popular time to fly and prices are also 1% 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 14,699 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 8395 reviews
7.8Entertainment
7.2Food
8.1Boarding
8.5Crew
7.8Comfort
Airline reviews

Great crew, flight on time, luggage pick up a breeze

10.0 ExcellentAnonymous, Jun 2026
SJU - JFK
Read more Delta reviews

Great crew, flight on time, luggage pick up a breeze

Was on time, normal boarding. The worst flight attendents and service I ever seen,, can't believe Delta can have such service. Bathroom was dirty and no toilet paper, paper towels and used toilet paper all over the floor, when I tried to tell flight attendant she didn't even let me to finish and turn around. Very rude. Wi fi didn't work.

Connection flights should be spaced out farther because too close I missed my connection.

Definitely a southern flavor. Cordiality was evident even though no drinks or snacks were served.

On time! There were plenty of airport employees who were able to keep us moving in the right direction. The crew on the plane were professional.

Left /arrived on time. Decent seat space. Like the wifi/plugs and entertainment. Windows and tray table were kinda gross. Attendants didn't start snack service til 40mins before landing. Two rows before us, captain came on to say there's turbulence and recalled staff to seats. So, no drink/snack. Later, attendants didn't stop to see if we had trash nor even look our way. Felt invisible! Almost all pilot announcements were not only unintelligible, but so quiet. We had no idea what she said.

Average seat comfort, a drink and chips were provided, early boarding because we checked a carryon at the gate was nice. Ticket pricing shenanigans, including fees to pick a seat, check a bag, and get food onboard - evidence the industry is reinvigorating last century’s strategies- destroys the experience before one ever arrives at the airport. It’s difficult to recognize any value or sustain loyalty in the end-to-end process making air travel more drudgery than pleasure.

Gate agent was unhelpful for handicapped boarding. Flight attendant seemed untrained.

Great flight with a terrific crew. Uneventful and early arrival. Thank you.

No service flight that took 5 hrs and a stop at an unscheduled airport. Crew and pilots did their jobs

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
Aberdeen
Edmonds
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