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Cheap flights from Seattle to Portugal from $260

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 2/7. 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.
Lufthansa Logo
2:00 pm - 10:25 pmSEA-OPO
24h 25m1 stop
Lufthansa Logo
2:05 pm - 1:20 pmOPO-SEA
31h 15m1 stop
$457Lufthansa
Find Deal
Tue, Dec 2 - Thu, Dec 11
Multiple Airlines Logo
1:40 pm - 10:30 amSEA-OPO
12h 50m1 stop
Multiple Airlines Logo
11:15 am - 11:50 amOPO-SEA
32h 35m1 stop
$477Multiple Airlines
Find Deal
Tue, Dec 2 - Thu, Dec 11
Multiple Airlines Logo
2:10 pm - 10:25 amSEA-OPO
36h 15m1 stop
Multiple Airlines Logo
11:15 am - 11:50 amOPO-SEA
32h 35m1 stop
$478Multiple Airlines
Find Deal
Wed, Jan 7 - Wed, Jan 21
United Airlines Logo
12:40 pm - 9:20 amSEA-LIS
36h 40m3 stops
United Airlines Logo
11:20 am - 4:01 pmLIS-SEA
36h 41m2 stops
$498United Airlines
Find Deal
Sat, Jan 10 - Thu, Jan 22
United Airlines Logo
8:40 am - 2:45 pmSEA-OPO
22h 05m2 stops
United Airlines Logo
6:00 am - 12:50 amOPO-SEA
50h 50m3 stops
$499United Airlines
Find Deal
Tue, Dec 2 - Thu, Dec 11
Delta Logo
2:10 pm - 5:30 pmSEA-LIS
19h 20m1 stop
Delta Logo
5:30 am - 8:00 pmLIS-SEA
22h 30m2 stops
$501Delta
Find Deal
Wed, Jan 7 - Wed, Jan 28
Delta Logo
7:35 am - 8:00 amSEA-LIS
16h 25m1 stop
Delta Logo
5:30 am - 7:00 pmLIS-SEA
21h 30m2 stops
$502Delta
Find Deal
Sat, Dec 6 - Tue, Dec 16
Air France Logo
7:35 am - 8:00 amSEA-LIS
16h 25m1 stop
Air France Logo
6:30 pm - 1:25 pmLIS-SEA
26h 55m1 stop
$504Air France
Find Deal
Thu, Dec 4 - Sun, Dec 7
British Airways Logo
7:50 pm - 2:15 pmSEA-FNC
35h 25m1 stop
British Airways Logo
4:55 pm - 12:30 pmFNC-SEA
26h 35m1 stop
$673British Airways
Find Deal
Sun, Mar 15 - Mon, Mar 23
British Airways Logo
1:48 pm - 2:15 pmSEA-FNC
41h 27m2 stops
British Airways Logo
4:55 pm - 12:30 pmFNC-SEA
26h 35m1 stop
$690British Airways
Find Deal
Sun, Mar 15 - Mon, Mar 23

Icelandair flights from Seattle to Portugal

Our best Icelandair deals on Seattle to Portugal flight tickets
Icelandair
Apr 4
SEA7:00 pmSeattle/Tacoma Intl
18h 20m
1 stop
LIS9:20 pmLisbon Humberto Delgado
Apr 9
LIS10:20 pmLisbon Humberto Delgado
27h 30m
1 stop
SEA5:50 pmSeattle/Tacoma Intl
$534
Find similar
Icelandair
Feb 14
SEA2:35 pmSeattle/Tacoma Intl
21h 45m
1 stop
LIS8:20 pmLisbon Humberto Delgado
Feb 22
LIS9:20 pmLisbon Humberto Delgado
27h 40m
1 stop
SEA5:00 pmSeattle/Tacoma Intl
$551
Find similar
Icelandair
Apr 1
SEA3:45 pmSeattle/Tacoma Intl
21h 35m
1 stop
LIS9:20 pmLisbon Humberto Delgado
Apr 9
LIS10:20 pmLisbon Humberto Delgado
27h 30m
1 stop
SEA5:50 pmSeattle/Tacoma Intl
$557
Find similar

Lufthansa flights from Seattle to Portugal

Our best Lufthansa deals on Seattle to Portugal flight tickets
Lufthansa
Dec 2
SEA2:00 pmSeattle/Tacoma Intl
24h 25m
1 stop
OPO10:25 pmPorto
Dec 11
OPO2:05 pmPorto
31h 15m
1 stop
SEA1:20 pmSeattle/Tacoma Intl
$457
Find similar
Lufthansa
Feb 22
SEA3:10 pmSeattle/Tacoma Intl
14h 10m
1 stop
LIS1:20 pmLisbon Humberto Delgado
Mar 1
LIS5:00 amLisbon Humberto Delgado
22h 16m
2 stops
SEA7:16 pmSeattle/Tacoma Intl
$503
Find similar
Lufthansa
Nov 12
SEA10:05 amSeattle/Tacoma Intl
20h 45m
2 stops
LIS2:50 pmLisbon Humberto Delgado
Dec 4
LIS5:00 amLisbon Humberto Delgado
36h 31m
2 stops
SEA9:31 amSeattle/Tacoma Intl
$506
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 November 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 12/2

2:00 pm-10:25 pm

1 stop24h 25m

Porto

Thu 12/11

2:05 pm-1:20 pm

1 stop31h 15m

$457

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Tue 12/2

1:40 pm-10:30 am

1 stop12h 50m

Porto

Thu 12/11

11:15 am-11:50 am

1 stop32h 35m

$477

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Wed 1/7

2:10 pm-10:25 am

1 stop36h 15m

Porto

Wed 1/21

11:15 am-11:50 am

1 stop32h 35m

$478

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Sat 1/10

12:40 pm-9:20 am

3 stops36h 40m

Lisbon Humberto Delgado

Thu 1/22

11:20 am-4:01 pm

2 stops36h 41m

$498

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Tue 12/2

8:40 am-2:45 pm

2 stops22h 05m

Porto

Thu 12/11

6:00 am-12:50 am

3 stops50h 50m

$499

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Wed 1/7

2:10 pm-5:30 pm

1 stop19h 20m

Lisbon Humberto Delgado

Wed 1/28

5:30 am-8:00 pm

2 stops22h 30m

$501

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Sat 12/6

7:35 am-8:00 am

1 stop16h 25m

Lisbon Humberto Delgado

Tue 12/16

5:30 am-7:00 pm

2 stops21h 30m

$502

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Thu 12/4

7:35 am-8:00 am

1 stop16h 25m

Lisbon Humberto Delgado

Sun 12/7

6:30 pm-1:25 pm

1 stop26h 55m

$504

SeattleFunchal

SEA - FNC

SEAFNC

Seattle/Tacoma Intl

Sun 3/15

7:50 pm-2:15 pm

1 stop35h 25m

Funchal Madeira

Mon 3/23

4:55 pm-12:30 pm

1 stop26h 35m

$673

SeattleFunchal

SEA - FNC

SEAFNC

Seattle/Tacoma Intl

Sun 3/15

1:48 pm-2:15 pm

2 stops41h 27m

Funchal Madeira

Mon 3/23

4:55 pm-12:30 pm

1 stop26h 35m

$690

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 $711, 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 November instead. Flights to Portugal in November, while not as cheap as those in January, still average around $731.

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 $919 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 $795 on momondo.

Can stopping save me money on Seattle to Portugal flights?

You could potentially save up to 14% 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

Direct flights

None
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 $358Free CancellationRating
7.1
571 reviews
Search Icelandair flights
LufthansaPriceFrom $517Free CancellationRating
6.8
7,553 reviews
Search Lufthansa flights
British AirwaysPriceFrom $534Free CancellationRating
6.7
7,496 reviews
Search British Airways flights
Air CanadaPriceFrom $543Free CancellationRating
7.1
10,404 reviews
Search Air Canada flights
United AirlinesPriceFrom $543Free CancellationRating
7.4
9,001 reviews
Search United Airlines flights
Air FrancePriceFrom $560Free CancellationRating
7.4
1,482 reviews
Search Air France flights
SWISSPriceFrom $562Free CancellationRating
7.5
1,777 reviews
Search SWISS flights
KLMPriceFrom $566Free CancellationRating
7.7
1,405 reviews
Search KLM flights
American AirlinesPriceFrom $621Free CancellationRating
7.2
11,040 reviews
Search American Airlines flights
Aer LingusPriceFrom $627Free CancellationRating
7.2
1,365 reviews
Search Aer Lingus 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

Popular cities in Portugal

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