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Cheap flights from Seattle to Portugal from $265

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 1/7. 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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Cheap round-trip flights

Enter your travel dates to find the best prices.
Lufthansa Logo
2:00 pm - 2:55 pmSEA-OPO
16h 55m1 stop
Lufthansa Logo
6:00 am - 10:43 pmOPO-SEA
24h 43m2 stops
$432Lufthansa
Find Deal
Mon, Jan 12 - Sun, Jan 25
Multiple Airlines Logo
12:35 pm - 6:30 pmSEA-OPO
21h 55m2 stops
Multiple Airlines Logo
2:05 pm - 1:20 pmOPO-SEA
31h 15m1 stop
$450Multiple Airlines
Find Deal
Thu, Jan 8 - Thu, Jan 15
Delta Logo
1:40 pm - 10:30 amSEA-OPO
12h 50m1 stop
Delta Logo
11:15 am - 11:40 amOPO-SEA
32h 25m1 stop
$464Delta
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Tue, Jan 27 - Tue, Feb 10
Delta Logo
1:40 pm - 10:30 amSEA-OPO
12h 50m1 stop
Delta Logo
11:15 am - 11:40 amOPO-SEA
32h 25m1 stop
$465Delta
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Tue, Jan 27 - Thu, Feb 12
KLM Logo
3:10 pm - 5:10 pmSEA-FNC
18h 00m1 stop
KLM Logo
10:20 am - 11:50 amFNC-SEA
33h 30m1 stop
$491KLM
Find Deal
Thu, Jan 22 - Thu, Jan 29
United Airlines Logo
5:00 am - 8:10 amSEA-LIS
19h 10m2 stops
United Airlines Logo
10:50 am - 6:28 pmLIS-SEA
39h 38m2 stops
$493United Airlines
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Fri, Jan 30 - Sun, Feb 8
United Airlines Logo
7:15 am - 9:20 amSEA-LIS
42h 05m2 stops
United Airlines Logo
10:50 am - 12:59 amLIS-SEA
46h 09m2 stops
$495United Airlines
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Sat, Feb 14 - Sun, Feb 22
KLM Logo
11:25 am - 5:10 pmSEA-FNC
21h 45m2 stops
KLM Logo
10:20 am - 11:50 amFNC-SEA
33h 30m1 stop
$496KLM
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Thu, Jan 22 - Thu, Jan 29
Air Canada Logo
3:40 pm - 7:55 amSEA-LIS
32h 15m2 stops
Air Canada Logo
10:50 am - 10:16 pmLIS-SEA
18h 26m1 stop
$498Air Canada
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Wed, Mar 4 - Sun, Mar 8
Air Canada Logo
8:10 am - 11:15 pmSEA-TER
32h 05m2 stops
Air Canada Logo
6:40 am - 9:31 amTER-SEA
33h 51m3 stops
$830Air Canada
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Wed, Jan 28 - Mon, Feb 2

Scandinavian Airlines flights from Seattle to Portugal

Our best Scandinavian Airlines deals on Seattle to Portugal flight tickets
Scandinavian Airlines
Jan 17
SEA7:15 amSeattle/Tacoma Intl
24h 50m
2 stops
LIS4:05 pmLisbon Humberto Delgado
Feb 1
LIS7:00 pmLisbon Humberto Delgado
31h 58m
2 stops
SEA6:58 pmSeattle/Tacoma Intl
$505
Find similar
Scandinavian Airlines
Mar 5
SEA7:10 amSeattle/Tacoma Intl
25h 45m
2 stops
OPO4:55 pmPorto
Mar 9
OPO5:35 pmPorto
35h 45m
2 stops
SEA10:20 pmSeattle/Tacoma Intl
$507
Find similar
Scandinavian Airlines
Jan 22
SEA7:15 amSeattle/Tacoma Intl
24h 35m
2 stops
LIS3:50 pmLisbon Humberto Delgado
Feb 1
LIS7:00 pmLisbon Humberto Delgado
35h 24m
2 stops
SEA10:24 pmSeattle/Tacoma Intl
$525
Find similar

United Airlines flights from Seattle to Portugal

Our best United Airlines deals on Seattle to Portugal flight tickets
United Airlines
Jan 30
SEA7:00 amSeattle/Tacoma Intl
17h 10m
2 stops
LIS8:10 amLisbon Humberto Delgado
Feb 8
LIS10:50 amLisbon Humberto Delgado
42h 22m
3 stops
SEA9:12 pmSeattle/Tacoma Intl
$493
Find similar
United Airlines
Feb 14
SEA7:15 amSeattle/Tacoma Intl
42h 05m
2 stops
LIS9:20 amLisbon Humberto Delgado
Feb 22
LIS10:50 amLisbon Humberto Delgado
46h 09m
2 stops
SEA12:59 amSeattle/Tacoma Intl
$495
Find similar
United Airlines
Jan 28
SEA9:25 amSeattle/Tacoma Intl
22h 00m
2 stops
OPO3:25 pmPorto
Feb 9
OPO6:00 amPorto
23h 12m
2 stops
SEA9:12 pmSeattle/Tacoma Intl
$502
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 26, 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

Mon 1/12

2:00 pm-2:55 pm

1 stop16h 55m

Porto

Sun 1/25

6:00 am-10:43 pm

2 stops24h 43m

$432

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Thu 1/8

12:35 pm-6:30 pm

2 stops21h 55m

Porto

Thu 1/15

2:05 pm-1:20 pm

1 stop31h 15m

$450

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Tue 1/27

1:40 pm-10:30 am

1 stop12h 50m

Porto

Tue 2/10

11:15 am-11:40 am

1 stop32h 25m

$464

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Tue 1/27

1:40 pm-10:30 am

1 stop12h 50m

Porto

Thu 2/12

11:15 am-11:40 am

1 stop32h 25m

$465

SeattleFunchal

SEA - FNC

SEAFNC

Seattle/Tacoma Intl

Thu 1/22

3:10 pm-5:10 pm

1 stop18h 00m

Funchal Madeira

Thu 1/29

10:20 am-11:50 am

1 stop33h 30m

$491

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Fri 1/30

5:00 am-8:10 am

2 stops19h 10m

Lisbon Humberto Delgado

Sun 2/8

10:50 am-6:28 pm

2 stops39h 38m

$493

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Sat 2/14

7:15 am-9:20 am

2 stops42h 05m

Lisbon Humberto Delgado

Sun 2/22

10:50 am-12:59 am

2 stops46h 09m

$495

SeattleFunchal

SEA - FNC

SEAFNC

Seattle/Tacoma Intl

Thu 1/22

11:25 am-5:10 pm

2 stops21h 45m

Funchal Madeira

Thu 1/29

10:20 am-11:50 am

1 stop33h 30m

$496

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Wed 3/4

3:40 pm-7:55 am

2 stops32h 15m

Lisbon Humberto Delgado

Sun 3/8

10:50 am-10:16 pm

1 stop18h 26m

$498

SeattleLajes

SEA - TER

SEATER

Seattle/Tacoma Intl

Wed 1/28

8:10 am-11:15 pm

2 stops32h 05m

Lajes

Mon 2/2

6:40 am-9:31 am

3 stops33h 51m

$830

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 $699.

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 $899 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 $774 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 50m

Direct flights

None
The fastest flight from Seattle to Portugal takes 12h 50m
There are no direct flights from Seattle to Portugal. There are no popular flight routes from Seattle to Portugal.
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  • 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 $359Free CancellationRating
7.0
581 reviews
Search Icelandair flights
KLMPriceFrom $481Free CancellationRating
7.7
1,422 reviews
Search KLM flights
LufthansaPriceFrom $516Free CancellationRating
6.8
7,594 reviews
Search Lufthansa flights
British AirwaysPriceFrom $529Free CancellationRating
6.7
7,539 reviews
Search British Airways flights
United AirlinesPriceFrom $533Free CancellationRating
7.4
9,046 reviews
Search United Airlines flights
Air CanadaPriceFrom $543Free CancellationRating
7.1
10,476 reviews
Search Air Canada flights
American AirlinesPriceFrom $558Free CancellationRating
7.2
11,038 reviews
Search American Airlines flights
Air FrancePriceFrom $560Free CancellationRating
7.4
1,497 reviews
Search Air France flights
SWISSPriceFrom $562Free CancellationRating
7.5
1,794 reviews
Search SWISS flights
Scandinavian AirlinesPriceFrom $576Free CancellationRating
7.4
1,589 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

Popular cities in Portugal

Popular flights according to clicks in the last 7 days on momondo
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Flights to Velasfrom $572