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Cheap flights from Seattle to Portugal from $221

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 4/1. 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.
United Airlines Logo
5:05 am - 9:30 am
SEA
-
OPO
20h 25m
2 stops
United Airlines Logo
12:35 pm - 10:53 pm
OPO
-
SEA
17h 18m
1 stop
$450United Airlines
Tue, Mar 3 - Tue, Mar 10
Multiple Airlines Logo
2:10 pm - 11:00 pm
SEA
-
OPO
24h 50m
1 stop
Multiple Airlines Logo
8:40 am - 6:30 pm
OPO
-
SEA
17h 50m
2 stops
$457Multiple Airlines
Tue, Apr 7 - Tue, May 5
Lufthansa Logo
3:10 pm - 1:15 pm
SEA
-
OPO
14h 05m
1 stop
Lufthansa Logo
2:05 pm - 2:20 pm
OPO
-
SEA
31h 15m
1 stop
$472Lufthansa
Wed, Mar 4 - Thu, Mar 12
British Airways Logo
8:20 pm - 8:20 pm
SEA
-
OPO
16h 00m
1 stop
British Airways Logo
8:20 am - 11:39 pm
OPO
-
SEA
23h 19m
2 stops
$478British Airways
Sun, Mar 29 - Thu, Apr 16
British Airways Logo
5:30 am - 8:20 pm
SEA
-
OPO
30h 50m
2 stops
British Airways Logo
8:20 am - 10:26 pm
OPO
-
SEA
22h 06m
2 stops
$482British Airways
Sun, Mar 29 - Thu, Apr 16
KLM Logo
3:05 pm - 8:25 am
SEA
-
FAO
33h 20m
1 stop
KLM Logo
6:55 pm - 12:35 pm
FAO
-
SEA
24h 40m
1 stop
$482KLM
Wed, Mar 4 - Wed, Mar 11
Lufthansa Logo
11:59 pm - 10:15 am
SEA
-
LIS
26h 16m
2 stops
Lufthansa Logo
5:00 am - 1:10 pm
LIS
-
SEA
15h 10m
1 stop
$483Lufthansa
Sat, Feb 28 - Fri, Mar 20
KLM Logo
3:05 pm - 9:05 am
SEA
-
FAO
34h 00m
1 stop
KLM Logo
10:05 am - 11:35 am
FAO
-
SEA
33h 30m
1 stop
$483KLM
Fri, Feb 20 - Mon, Mar 2
Air Canada Logo
3:40 pm - 11:00 am
SEA
-
LIS
59h 20m
2 stops
Air Canada Logo
1:00 pm - 9:51 pm
LIS
-
SEA
16h 51m
1 stop
$484Air Canada
Fri, Apr 10 - Mon, Apr 20
Air Canada Logo
9:55 am - 12:50 pm
SEA
-
TER
19h 55m
3 stops
Air Canada Logo
7:10 am - 9:17 am
TER
-
SEA
33h 07m
3 stops
$1,833Air Canada
Fri, Jul 3 - Sun, Jul 19

Lufthansa flights from Seattle to Portugal

Our best Lufthansa deals on Seattle to Portugal flight tickets
Lufthansa
Mar 4
SEA3:10 pmSeattle/Tacoma Intl
14h 05m
1 stop
OPO1:15 pmPorto
Mar 12
OPO2:05 pmPorto
31h 15m
1 stop
SEA2:20 pmSeattle/Tacoma Intl
$472
Lufthansa
Feb 28
SEA11:59 pmSeattle/Tacoma Intl
26h 16m
2 stops
LIS10:15 amLisbon Humberto Delgado
Mar 20
LIS5:00 amLisbon Humberto Delgado
15h 10m
1 stop
SEA1:10 pmSeattle/Tacoma Intl
$483
Lufthansa
Mar 22
SEA4:10 pmSeattle/Tacoma Intl
24h 20m
1 stop
LIS11:30 pmLisbon Humberto Delgado
Apr 1
LIS5:05 amLisbon Humberto Delgado
15h 15m
1 stop
SEA12:20 pmSeattle/Tacoma Intl
$486

United Airlines flights from Seattle to Portugal

Our best United Airlines deals on Seattle to Portugal flight tickets
United Airlines
Mar 3
SEA5:05 amSeattle/Tacoma Intl
20h 25m
2 stops
OPO9:30 amPorto
Mar 10
OPO12:35 pmPorto
17h 18m
1 stop
SEA10:53 pmSeattle/Tacoma Intl
$450
United Airlines
Mar 2
SEA7:00 amSeattle/Tacoma Intl
18h 30m
2 stops
OPO9:30 amPorto
Mar 9
OPO12:35 pmPorto
30h 05m
2 stops
SEA11:40 amSeattle/Tacoma Intl
$475
United Airlines
Mar 3
SEA2:00 pmSeattle/Tacoma Intl
16h 45m
1 stop
OPO2:45 pmPorto
Mar 10
OPO12:35 pmPorto
17h 18m
1 stop
SEA10:53 pmSeattle/Tacoma Intl
$486

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 January 18, 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 3/3

5:05 am-9:30 am

2 stops20h 25m

Porto

Tue 3/10

12:35 pm-10:53 pm

1 stop17h 18m

$450

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Tue 4/7

2:10 pm-11:00 pm

1 stop24h 50m

Porto

Tue 5/5

8:40 am-6:30 pm

2 stops17h 50m

$457

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Wed 3/4

3:10 pm-1:15 pm

1 stop14h 05m

Porto

Thu 3/12

2:05 pm-2:20 pm

1 stop31h 15m

$472

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Sun 3/29

8:20 pm-8:20 pm

1 stop16h 00m

Porto

Thu 4/16

8:20 am-11:39 pm

2 stops23h 19m

$478

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Sun 3/29

5:30 am-8:20 pm

2 stops30h 50m

Porto

Thu 4/16

8:20 am-10:26 pm

2 stops22h 06m

$482

SeattleFaro

SEA - FAO

SEAFAO

Seattle/Tacoma Intl

Wed 3/4

3:05 pm-8:25 am

1 stop33h 20m

Faro

Wed 3/11

6:55 pm-12:35 pm

1 stop24h 40m

$482

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Sat 2/28

11:59 pm-10:15 am

2 stops26h 16m

Lisbon Humberto Delgado

Fri 3/20

5:00 am-1:10 pm

1 stop15h 10m

$483

SeattleFaro

SEA - FAO

SEAFAO

Seattle/Tacoma Intl

Fri 2/20

3:05 pm-9:05 am

1 stop34h 00m

Faro

Mon 3/2

10:05 am-11:35 am

1 stop33h 30m

$483

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Fri 4/10

3:40 pm-11:00 am

2 stops59h 20m

Lisbon Humberto Delgado

Mon 4/20

1:00 pm-9:51 pm

1 stop16h 51m

$484

SeattleLajes

SEA - TER

SEATER

Seattle/Tacoma Intl

Fri 7/3

9:55 am-12:50 pm

3 stops19h 55m

Lajes

Sun 7/19

7:10 am-9:17 am

3 stops33h 07m

$1,833

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 $842 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 $761 on momondo.

Can stopping save me money on Seattle to Portugal flights?

You could potentially save up to 22% 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

13h 40m

Direct flights

None
The fastest flight from Seattle to Portugal takes 13h 40m
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 $348Free CancellationRating
7.1
597 reviews
Search Icelandair flights
KLMPriceFrom $481Free CancellationRating
7.7
1,441 reviews
Search KLM flights
LufthansaPriceFrom $489Free CancellationRating
6.8
7,731 reviews
Search Lufthansa flights
British AirwaysPriceFrom $491Free CancellationRating
6.7
7,689 reviews
Search British Airways flights
United AirlinesPriceFrom $500Free CancellationRating
7.4
9,177 reviews
Search United Airlines flights
Air CanadaPriceFrom $543Free CancellationRating
7.1
10,635 reviews
Search Air Canada flights
Air FrancePriceFrom $546Free CancellationRating
7.4
1,523 reviews
Search Air France flights
American AirlinesPriceFrom $558Free CancellationRating
7.2
11,160 reviews
Search American Airlines flights
SWISSPriceFrom $562Free CancellationRating
7.5
1,855 reviews
Search SWISS flights
DeltaPriceFrom $566Free CancellationRating
7.9
8,075 reviews
Search Delta 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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