$448 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 8/17. 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

Sat, Aug 15 - Fri, Aug 28
Multiple Airlines Logo
6:10 am - 9:00 pm
LIS
-
SEA
22h 50m
2 stops
Multiple Airlines Logo
3:40 pm - 8:50 pm
SEA
-
LIS
21h 10m
2 stops
$833Multiple Airlines
Mon, Jul 13 - Sun, Jul 19
WestJet Logo
6:15 am - 9:40 am
LIS
-
SEA
35h 25m
2 stops
WestJet Logo
7:00 am - 9:45 pm
SEA
-
LIS
30h 45m
2 stops
$855WestJet
Thu, Sep 17 - Mon, Sep 21
American Airlines Logo
6:35 am - 9:36 pm
LIS
-
SEA
23h 01m
2 stops
American Airlines Logo
1:38 pm - 11:10 pm
SEA
-
LIS
25h 32m
2 stops
$860American Airlines
Thu, Sep 17 - Mon, Sep 21
American Airlines Logo
6:35 am - 9:36 pm
LIS
-
SEA
23h 01m
2 stops
American Airlines Logo
1:38 pm - 11:10 pm
SEA
-
LIS
25h 32m
2 stops
$868American Airlines
Thu, Sep 17 - Mon, Sep 21
American Airlines Logo
6:35 am - 12:11 am
LIS
-
SEA
25h 36m
2 stops
American Airlines Logo
1:38 pm - 11:10 pm
SEA
-
LIS
25h 32m
2 stops
$869American Airlines
Thu, Sep 17 - Mon, Sep 21
American Airlines Logo
6:35 am - 9:36 pm
LIS
-
SEA
23h 01m
2 stops
American Airlines Logo
8:20 am - 9:05 am
SEA
-
LIS
16h 45m
1 stop
$870American Airlines
Thu, Sep 17 - Mon, Sep 21
British Airways Logo
11:05 am - 10:57 pm
LIS
-
SEA
19h 52m
1 stop
British Airways Logo
1:30 pm - 12:55 pm
SEA
-
LIS
15h 25m
1 stop
$874British Airways
Thu, Oct 1 - Sat, Oct 17
Delta Logo
5:00 am - 4:35 pm
OPO
-
SEA
19h 35m
1 stop
Delta Logo
6:45 pm - 10:00 pm
SEA
-
OPO
19h 15m
1 stop
$875Delta
Thu, Oct 22 - Mon, Oct 26
United Airlines Logo
6:00 am - 9:59 pm
OPO
-
SEA
23h 59m
2 stops
United Airlines Logo
6:50 am - 9:30 am
SEA
-
OPO
19h 40m
1 stop
$985United Airlines
Thu, Oct 22 - Mon, Oct 26
United Airlines Logo
12:35 pm - 9:55 pm
OPO
-
SEA
17h 20m
1 stop
United Airlines Logo
6:50 am - 9:30 am
SEA
-
OPO
19h 40m
1 stop
$1,009United 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 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$448
Best time to beat the crowds with an average 17% drop in price.
Most popular time to fly and prices are also 4% 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 13,207 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 8423 reviews
7.8Comfort
8.1Boarding
7.2Food
7.8Entertainment
8.5Crew
Airline reviews

The flights are constantly late anymore, and they won't even give you a glass of water on the plane. For years, they were able to do a service on this flight from Atlanta to Knoxville and Knoxville Atlanta now they say it's too short of a flight. You can't even get a quick drink of water.

4.0 OkayKelli, Jun 2026
ATL - TYS
Read more Delta reviews

The flights are constantly late anymore, and they won't even give you a glass of water on the plane. For years, they were able to do a service on this flight from Atlanta to Knoxville and Knoxville Atlanta now they say it's too short of a flight. You can't even get a quick drink of water.

Flight got canceled 4 times, missed my connecting flight due to delays, have to wait to go home tomorrow

Third flight in two months where the crew was not there. Comfort seating does not guarantee overhead bin space. Passengers with children are allowed on the plane first - if you are flying to and from Orlando, this means half the plane has boarded before you get on. And somehow all the bin space is taken up. 3 out of 5 flights have had issues with equipment or procedure. Some of these instances caused the flight to be delayed because of a "nuisance" light. One time it was a bag that had been brought on board but did not belong to anyone so we had to return to the gate. Last night we were told the "AC" on the plane doesn't work well and we're 10th for take off- because the crew was late - and that it will get cool when we're in the air. Not sure if this is usual, but I didn't think flight crew could jump seat in first class. Movie and TV selection has not been refreshed for several months- flying one to two round trips each month easily exhausts the list of content.

Great experience nice pilot very soft and easy landing and take off

We sat on the runway for over an hour before departure. That was unwelcome.

Horrible. Faucet in sink not working, wifi not working. Didn’t bring food or snacks

Flight was delayed before take off and at landing. Baggage took 20 minutes. Flight crew would not serve full soft drink and had to ask multiple times before receiving water.

From checking to boarding, it was a seamless experience. The service agents were so helpful. The flight crew was so pleasant.

Gate agent showed up 20 minutes before boarding and was not at all friendly. Had to take this flight due to the one on the day before being cancelled and any later options were already full with long standby lists. Despite having paid for Delta Comfort seats, Delta did not allow me (or anyone) to choose their seat. The agent assigned them for everyone just prior to boarding. Self seat selection was allowed on the original flight. Flight staff was great - very friendly.

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.

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