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Cheap flights from Seattle to Portugal from $283

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Seattle to Portugal departing on 5/4. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Find the cheapest flights from Seattle to Portugal

Cheap round-trip flights

Enter your travel dates to find the best prices.
Scandinavian Airlines Logo
3:55 pm - 3:35 pm
SEA
-
LIS
15h 40m
1 stop
Scandinavian Airlines Logo
4:25 pm - 1:45 pm
LIS
-
SEA
29h 20m
1 stop
$660Scandinavian Airlines
Tue, Sep 8 - Sat, Sep 19
Turkish Airlines Logo
7:10 pm - 3:40 pm
SEA
-
LIS
36h 30m
1 stop
Turkish Airlines Logo
11:00 am - 5:15 pm
LIS
-
SEA
38h 15m
1 stop
$692Turkish Airlines
Mon, Oct 5 - Fri, Oct 16
Multiple Airlines Logo
3:55 pm - 6:20 pm
SEA
-
LIS
18h 25m
2 stops
Multiple Airlines Logo
4:25 pm - 1:45 pm
LIS
-
SEA
29h 20m
1 stop
$696Multiple Airlines
Tue, Sep 8 - Sat, Sep 19
Multiple Airlines Logo
3:55 pm - 3:35 pm
SEA
-
LIS
15h 40m
1 stop
Multiple Airlines Logo
7:15 am - 10:05 pm
LIS
-
SEA
22h 50m
2 stops
$703Multiple Airlines
Tue, Aug 25 - Wed, Sep 16
British Airways Logo
8:20 pm - 7:05 pm
SEA
-
FAO
14h 45m
1 stop
British Airways Logo
8:00 pm - 11:35 am
FAO
-
SEA
23h 35m
1 stop
$965British Airways
Wed, Sep 23 - Wed, Sep 30
British Airways Logo
8:20 pm - 12:05 pm
SEA
-
FAO
31h 45m
1 stop
British Airways Logo
7:55 pm - 11:35 am
FAO
-
SEA
23h 40m
1 stop
$987British Airways
Tue, Sep 22 - Thu, Oct 1
United Airlines Logo
1:05 pm - 8:40 am
SEA
-
PDL
12h 35m
1 stop
United Airlines Logo
9:35 am - 5:45 pm
PDL
-
SEA
39h 10m
2 stops
$1,021United Airlines
Thu, Aug 6 - Fri, Aug 21
United Airlines Logo
1:05 pm - 8:40 am
SEA
-
PDL
12h 35m
1 stop
United Airlines Logo
9:35 am - 9:07 pm
PDL
-
SEA
18h 32m
1 stop
$1,035United Airlines
Thu, Aug 6 - Fri, Aug 21
KLM Logo
5:45 pm - 9:15 am
SEA
-
FNC
31h 30m
1 stop
KLM Logo
6:30 pm - 4:24 pm
FNC
-
SEA
29h 54m
1 stop
$1,196KLM
Tue, Jun 2 - Tue, Jun 9
KLM Logo
5:45 pm - 9:15 am
SEA
-
FNC
31h 30m
1 stop
KLM Logo
6:30 pm - 3:59 pm
FNC
-
SEA
29h 29m
2 stops
$1,206KLM
Tue, Jun 2 - Tue, Jun 9

Turkish Airlines flights from Seattle to Portugal

Our best Turkish Airlines deals on Seattle to Portugal flight tickets
Turkish Airlines
Oct 5
SEA7:10 pmSeattle/Tacoma Intl
36h 30m
1 stop
LIS3:40 pmLisbon Humberto Delgado
Oct 16
LIS11:00 amLisbon Humberto Delgado
38h 15m
1 stop
SEA5:15 pmSeattle/Tacoma Intl
$692
Turkish Airlines
Oct 5
SEA7:10 pmSeattle/Tacoma Intl
36h 30m
1 stop
LIS3:40 pmLisbon Humberto Delgado
Oct 16
LIS11:00 amLisbon Humberto Delgado
38h 15m
1 stop
SEA5:15 pmSeattle/Tacoma Intl
$693
Turkish Airlines
Aug 25
SEA7:10 pmSeattle/Tacoma Intl
20h 10m
1 stop
LIS11:20 pmLisbon Humberto Delgado
Sep 16
LIS5:55 amLisbon Humberto Delgado
19h 20m
1 stop
SEA5:15 pmSeattle/Tacoma Intl
$695

Delta flights from Seattle to Portugal

Our best Delta deals on Seattle to Portugal flight tickets
Delta
Apr 20
SEA6:40 pmSeattle/Tacoma Intl
15h 10m
1 stop
LIS5:50 pmLisbon Humberto Delgado
May 4
LIS11:55 amLisbon Humberto Delgado
31h 47m
1 stop
SEA11:42 amSeattle/Tacoma Intl
$717
Delta
Apr 21
SEA1:24 pmSeattle/Tacoma Intl
20h 26m
2 stops
LIS5:50 pmLisbon Humberto Delgado
Apr 29
LIS5:00 amLisbon Humberto Delgado
14h 40m
1 stop
SEA11:40 amSeattle/Tacoma Intl
$720
Delta
Apr 21
SEA6:00 amSeattle/Tacoma Intl
18h 50m
2 stops
LIS8:50 amLisbon Humberto Delgado
Apr 28
LIS5:00 amLisbon Humberto Delgado
19h 30m
1 stop
SEA4:30 pmSeattle/Tacoma Intl
$721

momondo Fare Finder

 
Customize your flight search to find flights from Seattle to Portugal that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated April 18, 2026.
Use the filters below to find and compare flights from Seattle to Portugal that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Tue 9/8

3:55 pm-3:35 pm

1 stop15h 40m

Lisbon Humberto Delgado

Sat 9/19

4:25 pm-1:45 pm

1 stop29h 20m

$660

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Mon 10/5

7:10 pm-3:40 pm

1 stop36h 30m

Lisbon Humberto Delgado

Fri 10/16

11:00 am-5:15 pm

1 stop38h 15m

$692

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Tue 9/8

3:55 pm-6:20 pm

2 stops18h 25m

Lisbon Humberto Delgado

Sat 9/19

4:25 pm-1:45 pm

1 stop29h 20m

$696

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Tue 8/25

3:55 pm-3:35 pm

1 stop15h 40m

Lisbon Humberto Delgado

Wed 9/16

7:15 am-10:05 pm

2 stops22h 50m

$703

SeattleFaro

SEA - FAO

SEAFAO

Seattle/Tacoma Intl

Wed 9/23

8:20 pm-7:05 pm

1 stop14h 45m

Faro

Wed 9/30

8:00 pm-11:35 am

1 stop23h 35m

$965

SeattleFaro

SEA - FAO

SEAFAO

Seattle/Tacoma Intl

Tue 9/22

8:20 pm-12:05 pm

1 stop31h 45m

Faro

Thu 10/1

7:55 pm-11:35 am

1 stop23h 40m

$987

SeattlePonta Delgada

SEA - PDL

SEAPDL

Seattle/Tacoma Intl

Thu 8/6

1:05 pm-8:40 am

1 stop12h 35m

Ponta Delgada Nordela

Fri 8/21

9:35 am-5:45 pm

2 stops39h 10m

$1,021
Quickest round-trip

SeattlePonta Delgada

SEA - PDL

SEAPDL

Seattle/Tacoma Intl

Thu 8/6

1:05 pm-8:40 am

1 stop12h 35m

Ponta Delgada Nordela

Fri 8/21

9:35 am-9:07 pm

1 stop18h 32m

$1,035

SeattleFunchal

SEA - FNC

SEAFNC

Seattle/Tacoma Intl

Tue 6/2

5:45 pm-9:15 am

1 stop31h 30m

Funchal Madeira

Tue 6/9

6:30 pm-4:24 pm

1 stop29h 54m

$1,196

SeattleFunchal

SEA - FNC

SEAFNC

Seattle/Tacoma Intl

Tue 6/2

5:45 pm-9:15 am

1 stop31h 30m

Funchal Madeira

Tue 6/9

6:30 pm-3:59 pm

2 stops29h 29m

$1,206

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Portugal from

How to get the cheapest flight ticket from Seattle to Portugal

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to Portugal?

The cheapest month to fly to Portugal from Seattle is in January. Flight prices, which tend to average around $492, are often lower during this time because this is during the off-season. If you aren’t able to travel during the month of January, then book flights to Portugal from Seattle during February instead. Flights to Portugal in February, while not as cheap as those in January, still average around $552.

How far in advance should I book a flight to Portugal?

You are more likely to see cheaper flights to Portugal from Seattle when booking weeks ahead of your departure date. In general, you can expect to find flights to Portugal for around $814 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Portugal from Seattle for as low as $727 on momondo.

Can stopping save me money on Seattle to Portugal flights?

You could potentially save up to 40% on your flight if you consider stops on a Seattle to Portugal flight.

Cheap Seattle to Portugal flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Seattle to Portugal

Fastest flight time

14h 10m

Direct flights

None
The fastest flight from Seattle to Portugal takes 14h 10m
There are no direct flights from Seattle to Portugal. There are no popular flight routes from Seattle to Portugal.
Search flight deals

Frequently asked questions about flying from Seattle to Portugal

  • When did momondo last update prices for flights from Seattle/Tacoma Intl Airport to Portugal?

    Prices for flights from Seattle/Tacoma Intl Airport to Portugal were last updated today.

  • How many operators does momondo search for flights from Seattle/Tacoma Intl Airport to Portugal?

  • How old do you have to be to fly from Seattle/Tacoma Intl Airport to Portugal?

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Seattle/Tacoma Intl Airport to Portugal.

  • What documentation or ID do you need to fly to Portugal?

    The necessary travel and health documents for your Portugal trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

Best airlines flying from Seattle to Portugal

Compare and see reviews for airlines that fly from Seattle to Portugal with momondo
Airline
Rating
Free Cancellation
Price
IcelandairPriceFrom $348Free CancellationRating
7.0
636 reviews
Search Icelandair flights
KLMPriceFrom $481Free CancellationRating
7.8
1,502 reviews
Search KLM flights
British AirwaysPriceFrom $482Free CancellationRating
6.7
7,892 reviews
Search British Airways flights
LufthansaPriceFrom $484Free CancellationRating
6.8
7,930 reviews
Search Lufthansa flights
United AirlinesPriceFrom $494Free CancellationRating
7.4
9,605 reviews
Search United Airlines flights
Air FrancePriceFrom $530Free CancellationRating
7.4
1,572 reviews
Search Air France flights
Air CanadaPriceFrom $543Free CancellationRating
7.1
10,939 reviews
Search Air Canada flights
DeltaPriceFrom $545Free CancellationRating
7.9
8,422 reviews
Search Delta flights
Aer LingusPriceFrom $553Free CancellationRating
7.3
1,513 reviews
Search Aer Lingus flights
American AirlinesPriceFrom $558Free CancellationRating
7.1
11,617 reviews
Search American Airlines flights

Why use momondo?

Why should I use momondo to find a flight deal from Seattle to Portugal?

It is quick and easy to find Seattle to Portugal flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Portugal that suits you.

Can I find flights from Seattle to Portugal with flexible booking policies on momondo?

All flight searches from Seattle to Portugal on momondo can be filtered to show those which offer flexible booking policies.

How can momondo help me find flights from Seattle to Portugal?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Seattle to Portugal.

I’m not ready to book a flight from Seattle to Portugal right now. Can momondo alert me if prices change?

If you are simply researching potential flights to Portugal, momondo offers a useful price alert feature which will track prices for flights to Portugal from Seattle and alert you when they change.

An easier way to manage your Portugal trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
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Find better results for your trip to Portugal

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Popular flights according to clicks in the last 7 days on momondo
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