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Cheap flights from Seattle to Portugal from $262

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 5/10. 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
3:00 pm - 2:45 pm
SEA
-
OPO
16h 45m
1 stop
Lufthansa Logo
6:30 am - 2:20 pm
OPO
-
SEA
14h 50m
1 stop
$455Lufthansa
Tue, Mar 10 - Fri, Mar 20
United Airlines Logo
8:50 pm - 9:30 am
SEA
-
OPO
28h 40m
1 stop
United Airlines Logo
6:00 am - 8:56 pm
OPO
-
SEA
21h 56m
2 stops
$479United Airlines
Sat, Mar 7 - Fri, Mar 20
Lufthansa Logo
2:00 pm - 10:25 pm
SEA
-
OPO
24h 25m
1 stop
Lufthansa Logo
6:30 am - 2:20 pm
OPO
-
SEA
14h 50m
1 stop
$482Lufthansa
Sat, Mar 7 - Fri, Mar 20
Air Canada Logo
8:00 pm - 9:20 am
SEA
-
LIS
29h 20m
2 stops
Air Canada Logo
6:15 am - 10:50 pm
LIS
-
SEA
24h 35m
2 stops
$486Air Canada
Wed, Apr 8 - Fri, Apr 17
KLM Logo
5:30 pm - 10:50 pm
SEA
-
LIS
21h 20m
1 stop
KLM Logo
7:45 pm - 11:45 am
LIS
-
SEA
24h 00m
1 stop
$492KLM
Tue, Apr 14 - Mon, Apr 27
Delta Logo
1:30 pm - 5:30 pm
SEA
-
LIS
21h 00m
2 stops
Delta Logo
5:00 am - 12:35 pm
LIS
-
SEA
14h 35m
1 stop
$493Delta
Tue, Mar 10 - Wed, Mar 18
KLM Logo
1:45 pm - 9:10 am
SEA
-
FNC
35h 25m
1 stop
KLM Logo
10:25 am - 11:45 am
FNC
-
SEA
33h 20m
1 stop
$608KLM
Sun, Apr 5 - Wed, Apr 15
British Airways Logo
1:37 pm - 5:50 pm
SEA
-
FAO
21h 13m
2 stops
British Airways Logo
7:10 pm - 7:29 pm
FAO
-
SEA
32h 19m
2 stops
$715British Airways
Wed, Mar 18 - Sun, Mar 29
British Airways Logo
7:50 pm - 5:50 pm
SEA
-
FAO
15h 00m
1 stop
British Airways Logo
7:10 pm - 9:16 pm
FAO
-
SEA
34h 06m
2 stops
$717British Airways
Wed, Mar 18 - Sun, Mar 29
Air Canada Logo
11:30 am - 8:20 am
SEA
-
PDL
13h 50m
1 stop
Air Canada Logo
9:35 am - 10:37 am
PDL
-
SEA
32h 02m
1 stop
$819Air Canada
Thu, Aug 6 - Fri, Aug 21

Air Canada flights from Seattle to Portugal

Our best Air Canada deals on Seattle to Portugal flight tickets
Air Canada
Apr 8
SEA8:00 pmSeattle/Tacoma Intl
29h 20m
2 stops
LIS9:20 amLisbon Humberto Delgado
Apr 17
LIS6:15 amLisbon Humberto Delgado
24h 35m
2 stops
SEA10:50 pmSeattle/Tacoma Intl
$486
Air Canada
Apr 8
SEA8:00 pmSeattle/Tacoma Intl
29h 20m
2 stops
LIS9:20 amLisbon Humberto Delgado
Apr 21
LIS1:00 pmLisbon Humberto Delgado
16h 53m
1 stop
SEA9:53 pmSeattle/Tacoma Intl
$505
Air Canada
Feb 23
SEA5:45 amSeattle/Tacoma Intl
19h 35m
2 stops
LIS9:20 amLisbon Humberto Delgado
Mar 3
LIS5:00 amLisbon Humberto Delgado
25h 16m
2 stops
SEA10:16 pmSeattle/Tacoma Intl
$507

Delta flights from Seattle to Portugal

Our best Delta deals on Seattle to Portugal flight tickets
Delta
Mar 10
SEA11:45 amSeattle/Tacoma Intl
20h 25m
2 stops
LIS3:10 pmLisbon Humberto Delgado
Mar 17
LIS5:00 amLisbon Humberto Delgado
14h 35m
1 stop
SEA12:35 pmSeattle/Tacoma Intl
$493
Delta
Mar 10
SEA1:30 pmSeattle/Tacoma Intl
21h 00m
2 stops
LIS5:30 pmLisbon Humberto Delgado
Mar 18
LIS5:00 amLisbon Humberto Delgado
21h 48m
2 stops
SEA7:48 pmSeattle/Tacoma Intl
$503
Delta
Apr 14
SEA7:15 amSeattle/Tacoma Intl
20h 00m
2 stops
LIS11:15 amLisbon Humberto Delgado
Apr 27
LIS5:00 amLisbon Humberto Delgado
14h 45m
1 stop
SEA11:45 amSeattle/Tacoma Intl
$517

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 February 8, 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

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Tue 3/10

3:00 pm-2:45 pm

1 stop16h 45m

Porto

Fri 3/20

6:30 am-2:20 pm

1 stop14h 50m

$455

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Sat 3/7

8:50 pm-9:30 am

1 stop28h 40m

Porto

Fri 3/20

6:00 am-8:56 pm

2 stops21h 56m

$479

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Sat 3/7

2:00 pm-10:25 pm

1 stop24h 25m

Porto

Fri 3/20

6:30 am-2:20 pm

1 stop14h 50m

$482

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Wed 4/8

8:00 pm-9:20 am

2 stops29h 20m

Lisbon Humberto Delgado

Fri 4/17

6:15 am-10:50 pm

2 stops24h 35m

$486

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Tue 4/14

5:30 pm-10:50 pm

1 stop21h 20m

Lisbon Humberto Delgado

Mon 4/27

7:45 pm-11:45 am

1 stop24h 00m

$492

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Tue 3/10

1:30 pm-5:30 pm

2 stops21h 00m

Lisbon Humberto Delgado

Wed 3/18

5:00 am-12:35 pm

1 stop14h 35m

$493

SeattleFunchal

SEA - FNC

SEAFNC

Seattle/Tacoma Intl

Sun 4/5

1:45 pm-9:10 am

1 stop35h 25m

Funchal Madeira

Wed 4/15

10:25 am-11:45 am

1 stop33h 20m

$608

SeattleFaro

SEA - FAO

SEAFAO

Seattle/Tacoma Intl

Wed 3/18

1:37 pm-5:50 pm

2 stops21h 13m

Faro

Sun 3/29

7:10 pm-7:29 pm

2 stops32h 19m

$715

SeattleFaro

SEA - FAO

SEAFAO

Seattle/Tacoma Intl

Wed 3/18

7:50 pm-5:50 pm

1 stop15h 00m

Faro

Sun 3/29

7:10 pm-9:16 pm

2 stops34h 06m

$717

SeattlePonta Delgada

SEA - PDL

SEAPDL

Seattle/Tacoma Intl

Thu 8/6

11:30 am-8:20 am

1 stop13h 50m

Ponta Delgada Nordela

Fri 8/21

9:35 am-10:37 am

1 stop32h 02m

$819

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 $504, 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 $594.

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 $839 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 $742 on momondo.

Can stopping save me money on Seattle to Portugal flights?

You could potentially save up to 24% 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

  • 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 $355Free CancellationRating
7.1
606 reviews
Search Icelandair flights
KLMPriceFrom $481Free CancellationRating
7.7
1,450 reviews
Search KLM flights
British AirwaysPriceFrom $482Free CancellationRating
6.7
7,723 reviews
Search British Airways flights
LufthansaPriceFrom $484Free CancellationRating
6.8
7,775 reviews
Search Lufthansa flights
United AirlinesPriceFrom $494Free CancellationRating
7.4
9,257 reviews
Search United Airlines flights
Air CanadaPriceFrom $543Free CancellationRating
7.1
10,698 reviews
Search Air Canada flights
Air FrancePriceFrom $546Free CancellationRating
7.4
1,531 reviews
Search Air France flights
DeltaPriceFrom $554Free CancellationRating
7.9
8,174 reviews
Search Delta flights
American AirlinesPriceFrom $558Free CancellationRating
7.2
11,254 reviews
Search American Airlines flights
SWISSPriceFrom $562Free CancellationRating
7.6
1,867 reviews
Search SWISS 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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