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Cheap flights from Seattle to Portugal from $303

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 10/31. 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.
British Airways Logo
10:35 am - 4:40 pm
SEA
-
OPO
22h 05m
2 stops
British Airways Logo
8:40 pm - 9:18 pm
OPO
-
SEA
32h 38m
2 stops
$777British Airways
Sun, Nov 1 - Wed, Nov 11
Turkish Airlines Logo
7:10 pm - 3:45 pm
SEA
-
OPO
36h 35m
1 stop
Turkish Airlines Logo
10:40 am - 5:15 pm
OPO
-
SEA
38h 35m
1 stop
$791Turkish Airlines
Wed, Sep 16 - Tue, Sep 22
Lufthansa Logo
3:05 pm - 11:00 am
SEA
-
LIS
35h 55m
2 stops
Lufthansa Logo
5:00 am - 12:10 pm
LIS
-
SEA
15h 10m
1 stop
$822Lufthansa
Tue, Nov 3 - Tue, Nov 10
Lufthansa Logo
10:35 am - 9:50 am
SEA
-
LIS
39h 15m
2 stops
Lufthansa Logo
5:00 am - 12:10 pm
LIS
-
SEA
15h 10m
1 stop
$823Lufthansa
Sun, Nov 1 - Tue, Nov 10
United Airlines Logo
6:50 am - 8:10 am
SEA
-
LIS
17h 20m
1 stop
United Airlines Logo
5:00 am - 12:10 pm
LIS
-
SEA
15h 10m
1 stop
$824United Airlines
Tue, Nov 3 - Fri, Nov 13
Delta Logo
2:05 pm - 5:30 pm
SEA
-
LIS
19h 25m
1 stop
Delta Logo
11:25 am - 11:47 am
LIS
-
SEA
32h 22m
1 stop
$825Delta
Sun, Nov 1 - Mon, Nov 9
Delta Logo
11:50 am - 9:00 am
SEA
-
LIS
13h 10m
1 stop
Delta Logo
11:25 am - 11:47 am
LIS
-
SEA
32h 22m
1 stop
$826Delta
Tue, Nov 3 - Mon, Nov 9
KLM Logo
1:45 pm - 9:40 am
SEA
-
FNC
35h 55m
1 stop
KLM Logo
10:25 am - 11:52 am
FNC
-
SEA
33h 27m
1 stop
$878KLM
Wed, Oct 14 - Wed, Oct 21
KLM Logo
1:45 pm - 9:40 am
SEA
-
FNC
35h 55m
1 stop
KLM Logo
10:25 am - 10:35 am
FNC
-
SEA
32h 10m
2 stops
$889KLM
Wed, Oct 14 - Wed, Oct 21
United Airlines Logo
11:10 pm - 9:50 am
SEA
-
FAO
26h 40m
2 stops
United Airlines Logo
11:40 am - 10:42 pm
FAO
-
SEA
19h 02m
2 stops
$984United Airlines
Tue, Sep 8 - Tue, Sep 15

Scandinavian Airlines flights from Seattle to Portugal

Our best Scandinavian Airlines deals on Seattle to Portugal flight tickets
Scandinavian Airlines
Oct 2
SEA3:55 pmSeattle/Tacoma Intl
15h 40m
1 stop
LIS3:35 pmLisbon Humberto Delgado
Oct 10
LIS4:25 pmLisbon Humberto Delgado
29h 20m
1 stop
SEA1:45 pmSeattle/Tacoma Intl
$816
Scandinavian Airlines
Oct 27
SEA12:00 pmSeattle/Tacoma Intl
45h 05m
2 stops
LIS4:05 pmLisbon Humberto Delgado
Nov 9
LIS4:55 pmLisbon Humberto Delgado
39h 23m
2 stops
SEA12:18 amSeattle/Tacoma Intl
$820
Scandinavian Airlines
Oct 2
SEA2:30 pmSeattle/Tacoma Intl
34h 30m
2 stops
LIS9:00 amLisbon Humberto Delgado
Oct 10
LIS4:25 pmLisbon Humberto Delgado
29h 20m
1 stop
SEA1:45 pmSeattle/Tacoma Intl
$841

Delta flights from Seattle to Portugal

Our best Delta deals on Seattle to Portugal flight tickets
Delta
Oct 31
SEA11:05 pmSeattle/Tacoma Intl
25h 55m
2 stops
LIS8:00 amLisbon Humberto Delgado
Nov 9
LIS11:25 amLisbon Humberto Delgado
32h 22m
1 stop
SEA11:47 amSeattle/Tacoma Intl
$830
Delta
Oct 24
SEA9:55 pmSeattle/Tacoma Intl
28h 05m
2 stops
LIS9:00 amLisbon Humberto Delgado
Nov 9
LIS11:25 amLisbon Humberto Delgado
32h 22m
1 stop
SEA11:47 amSeattle/Tacoma Intl
$836
Delta
Oct 31
SEA3:30 pmSeattle/Tacoma Intl
33h 30m
1 stop
LIS8:00 amLisbon Humberto Delgado
Nov 9
LIS11:25 amLisbon Humberto Delgado
32h 22m
1 stop
SEA11:47 amSeattle/Tacoma Intl
$838

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 May 9, 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

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Sun 11/1

10:35 am-4:40 pm

2 stops22h 05m

Porto

Wed 11/11

8:40 pm-9:18 pm

2 stops32h 38m

$777

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Wed 9/16

7:10 pm-3:45 pm

1 stop36h 35m

Porto

Tue 9/22

10:40 am-5:15 pm

1 stop38h 35m

$791

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Tue 11/3

3:05 pm-11:00 am

2 stops35h 55m

Lisbon Humberto Delgado

Tue 11/10

5:00 am-12:10 pm

1 stop15h 10m

$822

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Sun 11/1

10:35 am-9:50 am

2 stops39h 15m

Lisbon Humberto Delgado

Tue 11/10

5:00 am-12:10 pm

1 stop15h 10m

$823
Quickest round-trip

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Tue 11/3

6:50 am-8:10 am

1 stop17h 20m

Lisbon Humberto Delgado

Fri 11/13

5:00 am-12:10 pm

1 stop15h 10m

$824

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Sun 11/1

2:05 pm-5:30 pm

1 stop19h 25m

Lisbon Humberto Delgado

Mon 11/9

11:25 am-11:47 am

1 stop32h 22m

$825

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Tue 11/3

11:50 am-9:00 am

1 stop13h 10m

Lisbon Humberto Delgado

Mon 11/9

11:25 am-11:47 am

1 stop32h 22m

$826

SeattleFunchal

SEA - FNC

SEAFNC

Seattle/Tacoma Intl

Wed 10/14

1:45 pm-9:40 am

1 stop35h 55m

Funchal Madeira

Wed 10/21

10:25 am-11:52 am

1 stop33h 27m

$878

SeattleFunchal

SEA - FNC

SEAFNC

Seattle/Tacoma Intl

Wed 10/14

1:45 pm-9:40 am

1 stop35h 55m

Funchal Madeira

Wed 10/21

10:25 am-10:35 am

2 stops32h 10m

$889

SeattleFaro

SEA - FAO

SEAFAO

Seattle/Tacoma Intl

Tue 9/8

11:10 pm-9:50 am

2 stops26h 40m

Faro

Tue 9/15

11:40 am-10:42 pm

2 stops19h 02m

$984

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 $339, 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 April instead. Flights to Portugal in April, while not as cheap as those in January, still average around $390.

How far in advance should I book a flight from Seattle 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 $817 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

12h 35m

Direct flights

None
The fastest flight from Seattle to Portugal takes 12h 35m
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
653 reviews
Search Icelandair flights
KLMPriceFrom $481Free CancellationRating
7.8
1,513 reviews
Search KLM flights
LufthansaPriceFrom $482Free CancellationRating
6.8
7,985 reviews
Search Lufthansa flights
British AirwaysPriceFrom $482Free CancellationRating
6.7
7,963 reviews
Search British Airways flights
United AirlinesPriceFrom $494Free CancellationRating
7.4
9,694 reviews
Search United Airlines flights
Air FrancePriceFrom $505Free CancellationRating
7.4
1,585 reviews
Search Air France flights
Air CanadaPriceFrom $543Free CancellationRating
7.1
11,012 reviews
Search Air Canada flights
DeltaPriceFrom $545Free CancellationRating
7.9
8,455 reviews
Search Delta flights
Aer LingusPriceFrom $553Free CancellationRating
7.3
1,551 reviews
Search Aer Lingus flights
American AirlinesPriceFrom $558Free CancellationRating
7.1
11,668 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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