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Cheap flights from Seattle to Portugal from $270

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 1/14. 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.
Delta Logo
1:40 pm - 10:30 am
SEA
-
OPO
12h 50m1 stop
Delta Logo
11:15 am - 11:40 am
OPO
-
SEA
32h 25m1 stop
$462Delta
Tue, Jan 27 - Mon, Feb 9
Delta Logo
2:10 pm - 10:25 am
SEA
-
OPO
36h 15m1 stop
Delta Logo
5:00 am - 11:40 am
OPO
-
SEA
14h 40m1 stop
$464Delta
Wed, Jan 28 - Tue, Feb 10
KLM Logo
2:10 pm - 10:30 am
SEA
-
OPO
36h 20m1 stop
KLM Logo
9:55 am - 11:50 am
OPO
-
SEA
33h 55m1 stop
$466KLM
Mon, Jan 12 - Tue, Jan 20
Lufthansa Logo
10:05 am - 7:55 am
SEA
-
LIS
37h 50m2 stops
Lufthansa Logo
5:00 am - 1:10 pm
LIS
-
SEA
15h 10m1 stop
$482Lufthansa
Wed, Mar 4 - Mon, Mar 16
KLM Logo
3:10 pm - 6:25 pm
SEA
-
FAO
19h 15m1 stop
KLM Logo
5:45 pm - 11:50 am
FAO
-
SEA
26h 05m1 stop
$482KLM
Sun, Jan 18 - Sat, Jan 24
United Airlines Logo
9:00 am - 8:10 am
SEA
-
LIS
15h 10m2 stops
United Airlines Logo
5:00 am - 1:10 pm
LIS
-
SEA
15h 10m1 stop
$483United Airlines
Tue, Feb 24 - Tue, Mar 10
Lufthansa Logo
3:40 pm - 8:55 am
SEA
-
LIS
33h 15m2 stops
Lufthansa Logo
6:10 am - 1:20 pm
LIS
-
SEA
15h 10m1 stop
$484Lufthansa
Fri, Jan 16 - Wed, Jan 28
British Airways Logo
6:50 pm - 11:20 am
SEA
-
FNC
32h 30m1 stop
British Airways Logo
12:25 pm - 4:55 pm
FNC
-
SEA
36h 30m1 stop
$485British Airways
Wed, Jan 14 - Mon, Jan 26
United Airlines Logo
8:40 am - 8:10 am
SEA
-
LIS
15h 30m2 stops
United Airlines Logo
6:10 am - 1:20 pm
LIS
-
SEA
15h 10m1 stop
$485United Airlines
Thu, Jan 22 - Wed, Jan 28
British Airways Logo
1:35 pm - 4:05 pm
SEA
-
FNC
18h 30m1 stop
British Airways Logo
4:00 pm - 4:55 pm
FNC
-
SEA
32h 55m1 stop
$510British Airways
Fri, Jan 16 - Wed, Jan 21

Lufthansa flights from Seattle to Portugal

Our best Lufthansa deals on Seattle to Portugal flight tickets
Lufthansa
Mar 4
SEA10:05 amSeattle/Tacoma Intl
37h 50m
2 stops
LIS7:55 amLisbon Humberto Delgado
Mar 20
LIS5:00 amLisbon Humberto Delgado
15h 10m
1 stop
SEA1:10 pmSeattle/Tacoma Intl
$482
Find similar
Lufthansa
Jan 16
SEA3:40 pmSeattle/Tacoma Intl
33h 15m
2 stops
LIS8:55 amLisbon Humberto Delgado
Jan 28
LIS6:10 amLisbon Humberto Delgado
15h 10m
1 stop
SEA1:20 pmSeattle/Tacoma Intl
$484
Find similar
Lufthansa
Mar 4
SEA10:05 amSeattle/Tacoma Intl
37h 50m
2 stops
LIS7:55 amLisbon Humberto Delgado
Mar 18
LIS5:00 amLisbon Humberto Delgado
21h 03m
2 stops
SEA7:03 pmSeattle/Tacoma Intl
$492
Find similar

Scandinavian Airlines flights from Seattle to Portugal

Our best Scandinavian Airlines deals on Seattle to Portugal flight tickets
Scandinavian Airlines
Mar 5
SEA7:30 amSeattle/Tacoma Intl
25h 25m
2 stops
OPO4:55 pmPorto
Mar 9
OPO5:35 pmPorto
35h 45m
2 stops
SEA10:20 pmSeattle/Tacoma Intl
$508
Find similar
Scandinavian Airlines
Jan 16
SEA7:15 amSeattle/Tacoma Intl
41h 40m
2 stops
LIS8:55 amLisbon Humberto Delgado
Jan 28
LIS4:55 pmLisbon Humberto Delgado
38h 27m
2 stops
SEA11:22 pmSeattle/Tacoma Intl
$516
Find similar
Scandinavian Airlines
Mar 16
SEA11:45 amSeattle/Tacoma Intl
26h 45m
2 stops
LIS9:30 pmLisbon Humberto Delgado
Mar 29
LIS11:55 pmLisbon Humberto Delgado
30h 27m
2 stops
SEA10:22 pmSeattle/Tacoma Intl
$522
Find similar

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 December 4, 2025.
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

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Tue 1/27

1:40 pm-10:30 am

1 stop12h 50m

Porto

Mon 2/9

11:15 am-11:40 am

1 stop32h 25m

$462

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Wed 1/28

2:10 pm-10:25 am

1 stop36h 15m

Porto

Tue 2/10

5:00 am-11:40 am

1 stop14h 40m

$464

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Mon 1/12

2:10 pm-10:30 am

1 stop36h 20m

Porto

Tue 1/20

9:55 am-11:50 am

1 stop33h 55m

$466

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Wed 3/4

10:05 am-7:55 am

2 stops37h 50m

Lisbon Humberto Delgado

Mon 3/16

5:00 am-1:10 pm

1 stop15h 10m

$482

SeattleFaro

SEA - FAO

SEAFAO

Seattle/Tacoma Intl

Sun 1/18

3:10 pm-6:25 pm

1 stop19h 15m

Faro

Sat 1/24

5:45 pm-11:50 am

1 stop26h 05m

$482

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Tue 2/24

9:00 am-8:10 am

2 stops15h 10m

Lisbon Humberto Delgado

Tue 3/10

5:00 am-1:10 pm

1 stop15h 10m

$483

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Fri 1/16

3:40 pm-8:55 am

2 stops33h 15m

Lisbon Humberto Delgado

Wed 1/28

6:10 am-1:20 pm

1 stop15h 10m

$484

SeattleFunchal

SEA - FNC

SEAFNC

Seattle/Tacoma Intl

Wed 1/14

6:50 pm-11:20 am

1 stop32h 30m

Funchal Madeira

Mon 1/26

12:25 pm-4:55 pm

1 stop36h 30m

$485

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Thu 1/22

8:40 am-8:10 am

2 stops15h 30m

Lisbon Humberto Delgado

Wed 1/28

6:10 am-1:20 pm

1 stop15h 10m

$485

SeattleFunchal

SEA - FNC

SEAFNC

Seattle/Tacoma Intl

Fri 1/16

1:35 pm-4:05 pm

1 stop18h 30m

Funchal Madeira

Wed 1/21

4:00 pm-4:55 pm

1 stop32h 55m

$510

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 November. Flight prices, which tend to average around $641, are often lower during this time because this is during the off-season. If you aren’t able to travel during the month of November, then book flights to Portugal from Seattle during January instead. Flights to Portugal in January, while not as cheap as those in November, still average around $696.

What is the cheapest day to depart on your flight to Portugal?

According to our data, Monday is the cheapest day to fly to Portugal from Seattle. The lowest ticket price found for a Monday departure recently was $908. Keep in mind that prices can always vary depending on your route and whether or not you are flying domestic or international. The most expensive day to fly to Portugal is Friday, with ticket prices averaging around $1,111.

What is the cheapest time of day to depart on your flight to Portugal?

Our most recent data shows that the best time of day to fly to Portugal is in the afternoon. Flights from Seattle to Portugal during this time can be as low as $959. At noon is when there is more demand to fly to Portugal, so prices are often more expensive at around $1,074 per ticket.

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 $898 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 $788 on momondo.

Can stopping save me money on Seattle to Portugal flights?

You could potentially save up to 38% 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 54m

Direct flights

None
The fastest flight from Seattle to Portugal takes 12h 54m
There are no direct flights from Seattle to Portugal. There are no popular flight routes from Seattle to Portugal.
Search flight deals

  • 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 $357Free CancellationRating
7.0
584 reviews
Search Icelandair flights
KLMPriceFrom $481Free CancellationRating
7.7
1,428 reviews
Search KLM flights
United AirlinesPriceFrom $512Free CancellationRating
7.4
9,063 reviews
Search United Airlines flights
LufthansaPriceFrom $516Free CancellationRating
6.8
7,612 reviews
Search Lufthansa flights
British AirwaysPriceFrom $528Free CancellationRating
6.7
7,559 reviews
Search British Airways flights
Air CanadaPriceFrom $543Free CancellationRating
7.1
10,500 reviews
Search Air Canada flights
Air FrancePriceFrom $554Free CancellationRating
7.4
1,500 reviews
Search Air France flights
American AirlinesPriceFrom $558Free CancellationRating
7.2
11,045 reviews
Search American Airlines flights
SWISSPriceFrom $562Free CancellationRating
7.5
1,800 reviews
Search SWISS flights
Scandinavian AirlinesPriceFrom $576Free CancellationRating
7.4
1,591 reviews
Search Scandinavian 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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