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Cheap flights from Seattle to Portugal from $245

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 4/12. 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.
Multiple Airlines Logo
6:40 pm - 10:00 pm
SEA
-
OPO
19h 20m
1 stop
Multiple Airlines Logo
7:10 pm - 11:45 am
OPO
-
SEA
24h 35m
1 stop
$478Multiple Airlines
Mon, Apr 13 - Wed, Apr 29
Multiple Airlines Logo
6:40 pm - 10:00 pm
SEA
-
OPO
19h 20m
1 stop
Multiple Airlines Logo
7:00 pm - 11:45 am
OPO
-
SEA
24h 45m
1 stop
$479Multiple Airlines
Mon, Apr 13 - Mon, Apr 20
Delta Logo
6:40 pm - 10:00 pm
SEA
-
OPO
19h 20m
1 stop
Delta Logo
5:00 am - 8:25 pm
OPO
-
SEA
23h 25m
2 stops
$489Delta
Mon, Apr 20 - Wed, Apr 29
Delta Logo
7:15 am - 11:15 am
SEA
-
LIS
20h 00m
2 stops
Delta Logo
5:00 am - 11:45 am
LIS
-
SEA
14h 45m
1 stop
$491Delta
Tue, Apr 14 - Tue, Apr 21
United Airlines Logo
11:59 pm - 9:45 am
SEA
-
OPO
25h 46m
2 stops
United Airlines Logo
6:00 am - 1:12 am
OPO
-
SEA
27h 12m
2 stops
$492United Airlines
Mon, Apr 20 - Thu, Apr 30
KLM Logo
5:30 pm - 9:30 am
SEA
-
FNC
32h 00m
1 stop
KLM Logo
6:40 pm - 4:30 pm
FNC
-
SEA
29h 50m
1 stop
$493KLM
Sat, Apr 18 - Sun, Apr 26
KLM Logo
4:05 pm - 6:50 pm
SEA
-
LIS
19h 45m
1 stop
KLM Logo
7:45 pm - 11:45 am
LIS
-
SEA
24h 00m
1 stop
$493KLM
Tue, Mar 24 - Tue, Apr 21
British Airways Logo
8:20 pm - 11:00 pm
SEA
-
LIS
18h 40m
1 stop
British Airways Logo
3:15 pm - 11:35 am
LIS
-
SEA
28h 20m
1 stop
$501British Airways
Tue, Apr 21 - Wed, May 6
United Airlines Logo
10:35 pm - 9:45 am
SEA
-
OPO
27h 10m
2 stops
United Airlines Logo
12:35 pm - 11:37 am
OPO
-
SEA
31h 02m
2 stops
$501United Airlines
Mon, Apr 20 - Wed, Apr 29
British Airways Logo
1:35 pm - 6:35 pm
SEA
-
FNC
21h 00m
1 stop
British Airways Logo
7:00 pm - 11:35 am
FNC
-
SEA
24h 35m
1 stop
$534British Airways
Mon, Apr 13 - Mon, Apr 27

British Airways flights from Seattle to Portugal

Our best British Airways deals on Seattle to Portugal flight tickets
British Airways
Apr 21
SEA8:20 pmSeattle/Tacoma Intl
18h 40m
1 stop
LIS11:00 pmLisbon Humberto Delgado
May 6
LIS3:15 pmLisbon Humberto Delgado
28h 20m
1 stop
SEA11:35 amSeattle/Tacoma Intl
$501
British Airways
Apr 21
SEA8:20 pmSeattle/Tacoma Intl
13h 35m
1 stop
LIS5:55 pmLisbon Humberto Delgado
May 2
LIS6:55 pmLisbon Humberto Delgado
34h 27m
2 stops
SEA9:22 pmSeattle/Tacoma Intl
$512
British Airways
Apr 22
SEA8:20 pmSeattle/Tacoma Intl
18h 55m
1 stop
LIS11:15 pmLisbon Humberto Delgado
Apr 30
LIS11:05 amLisbon Humberto Delgado
18h 18m
1 stop
SEA9:23 pmSeattle/Tacoma Intl
$530

Delta flights from Seattle to Portugal

Our best Delta deals on Seattle to Portugal flight tickets
Delta
Apr 20
SEA6:40 pmSeattle/Tacoma Intl
19h 20m
1 stop
OPO10:00 pmPorto
Apr 29
OPO5:00 amPorto
23h 25m
2 stops
SEA8:25 pmSeattle/Tacoma Intl
$489
Delta
Apr 14
SEA7:15 amSeattle/Tacoma Intl
20h 00m
2 stops
LIS11:15 amLisbon Humberto Delgado
Apr 21
LIS5:00 amLisbon Humberto Delgado
14h 45m
1 stop
SEA11:45 amSeattle/Tacoma Intl
$491
Delta
Apr 14
SEA7:15 amSeattle/Tacoma Intl
20h 00m
2 stops
LIS11:15 amLisbon Humberto Delgado
Apr 21
LIS5:00 amLisbon Humberto Delgado
14h 45m
1 stop
SEA11:45 amSeattle/Tacoma Intl
$492

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 20, 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

Mon 4/13

6:40 pm-10:00 pm

1 stop19h 20m

Porto

Wed 4/29

7:10 pm-11:45 am

1 stop24h 35m

$478

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Mon 4/13

6:40 pm-10:00 pm

1 stop19h 20m

Porto

Mon 4/20

7:00 pm-11:45 am

1 stop24h 45m

$479

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Mon 4/20

6:40 pm-10:00 pm

1 stop19h 20m

Porto

Wed 4/29

5:00 am-8:25 pm

2 stops23h 25m

$489

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Tue 4/14

7:15 am-11:15 am

2 stops20h 00m

Lisbon Humberto Delgado

Tue 4/21

5:00 am-11:45 am

1 stop14h 45m

$491

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Mon 4/20

11:59 pm-9:45 am

2 stops25h 46m

Porto

Thu 4/30

6:00 am-1:12 am

2 stops27h 12m

$492

SeattleFunchal

SEA - FNC

SEAFNC

Seattle/Tacoma Intl

Sat 4/18

5:30 pm-9:30 am

1 stop32h 00m

Funchal Madeira

Sun 4/26

6:40 pm-4:30 pm

1 stop29h 50m

$493

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Tue 3/24

4:05 pm-6:50 pm

1 stop19h 45m

Lisbon Humberto Delgado

Tue 4/21

7:45 pm-11:45 am

1 stop24h 00m

$493

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Tue 4/21

8:20 pm-11:00 pm

1 stop18h 40m

Lisbon Humberto Delgado

Wed 5/6

3:15 pm-11:35 am

1 stop28h 20m

$501

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Mon 4/20

10:35 pm-9:45 am

2 stops27h 10m

Porto

Wed 4/29

12:35 pm-11:37 am

2 stops31h 02m

$501

SeattleFunchal

SEA - FNC

SEAFNC

Seattle/Tacoma Intl

Mon 4/13

1:35 pm-6:35 pm

1 stop21h 00m

Funchal Madeira

Mon 4/27

7:00 pm-11:35 am

1 stop24h 35m

$534

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 $492, 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 February instead. Flights to Portugal in February, while not as cheap as those in January, still average around $560.

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 $823 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 $738 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
615 reviews
Search Icelandair flights
KLMPriceFrom $481Free CancellationRating
7.7
1,457 reviews
Search KLM flights
British AirwaysPriceFrom $483Free CancellationRating
6.7
7,757 reviews
Search British Airways flights
LufthansaPriceFrom $484Free CancellationRating
6.8
7,795 reviews
Search Lufthansa flights
United AirlinesPriceFrom $494Free CancellationRating
7.4
9,331 reviews
Search United Airlines flights
Air FrancePriceFrom $530Free CancellationRating
7.4
1,533 reviews
Search Air France flights
Air CanadaPriceFrom $543Free CancellationRating
7.1
10,733 reviews
Search Air Canada flights
DeltaPriceFrom $554Free CancellationRating
7.9
8,223 reviews
Search Delta flights
American AirlinesPriceFrom $558Free CancellationRating
7.2
11,323 reviews
Search American Airlines flights
SWISSPriceFrom $562Free CancellationRating
7.5
1,878 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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