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Cheap flights from Seattle to Portugal from $252

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 1/31. 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
3:10 pm - 1:15 pm
SEA
-
OPO
14h 05m1 stop
Lufthansa Logo
6:30 am - 1:20 pm
OPO
-
SEA
14h 50m1 stop
$462Lufthansa
Wed, Feb 25 - Fri, Mar 6
Multiple Airlines Logo
1:40 pm - 10:30 am
SEA
-
OPO
12h 50m1 stop
Multiple Airlines Logo
4:10 pm - 11:35 am
OPO
-
SEA
27h 25m1 stop
$479Multiple Airlines
Tue, Feb 24 - Sat, Mar 7
Multiple Airlines Logo
2:15 pm - 10:25 am
SEA
-
OPO
36h 10m1 stop
Multiple Airlines Logo
4:10 pm - 11:35 am
OPO
-
SEA
27h 25m1 stop
$480Multiple Airlines
Wed, Feb 25 - Thu, Mar 5
Lufthansa Logo
3:10 pm - 1:15 pm
SEA
-
OPO
14h 05m1 stop
Lufthansa Logo
6:30 am - 7:16 pm
OPO
-
SEA
20h 46m2 stops
$481Lufthansa
Wed, Feb 25 - Fri, Mar 6
United Airlines Logo
8:17 am - 10:15 am
SEA
-
LIS
17h 58m1 stop
United Airlines Logo
5:00 am - 12:10 pm
LIS
-
SEA
15h 10m1 stop
$484United Airlines
Tue, Feb 24 - Thu, Mar 5
Delta Logo
6:40 pm - 5:50 pm
SEA
-
LIS
15h 10m1 stop
Delta Logo
5:00 am - 4:30 pm
LIS
-
SEA
19h 30m1 stop
$485Delta
Sun, Apr 19 - Wed, Apr 29
United Airlines Logo
9:00 am - 9:30 am
SEA
-
OPO
16h 30m2 stops
United Airlines Logo
6:00 am - 10:45 pm
OPO
-
SEA
24h 45m2 stops
$486United Airlines
Tue, Feb 24 - Fri, Mar 6
Delta Logo
2:10 pm - 5:30 pm
SEA
-
LIS
19h 20m1 stop
Delta Logo
5:00 am - 12:35 pm
LIS
-
SEA
14h 35m1 stop
$487Delta
Sun, Mar 1 - Tue, Mar 10
Air Canada Logo
8:00 am - 11:05 am
SEA
-
LIS
19h 05m1 stop
Air Canada Logo
6:15 am - 9:33 am
LIS
-
SEA
35h 18m2 stops
$488Air Canada
Thu, Apr 9 - Fri, Apr 17
British Airways Logo
6:50 pm - 11:20 am
SEA
-
FNC
32h 30m1 stop
British Airways Logo
4:00 pm - 5:55 pm
FNC
-
SEA
32h 55m1 stop
$535British Airways
Wed, Mar 4 - Wed, Mar 11

British Airways flights from Seattle to Portugal

Our best British Airways deals on Seattle to Portugal flight tickets
British Airways
Mar 23
SEA1:37 pmSeattle/Tacoma Intl
22h 18m
2 stops
LIS6:55 pmLisbon Humberto Delgado
Mar 31
LIS1:35 pmLisbon Humberto Delgado
30h 00m
1 stop
SEA11:35 amSeattle/Tacoma Intl
$504
Find similar
British Airways
Mar 4
SEA6:50 pmSeattle/Tacoma Intl
32h 30m
1 stop
FNC11:20 amFunchal Madeira
Mar 11
FNC4:00 pmFunchal Madeira
32h 55m
1 stop
SEA5:55 pmSeattle/Tacoma Intl
$535
Find similar
British Airways
Jan 9
SEA6:50 pmSeattle/Tacoma Intl
15h 05m
1 stop
LIS5:55 pmLisbon Humberto Delgado
Jan 22
LIS7:00 amLisbon Humberto Delgado
17h 55m
1 stop
SEA4:55 pmSeattle/Tacoma Intl
$614
Find similar

Air Canada flights from Seattle to Portugal

Our best Air Canada deals on Seattle to Portugal flight tickets
Air Canada
Mar 4
SEA3:40 pmSeattle/Tacoma Intl
32h 15m
2 stops
LIS7:55 amLisbon Humberto Delgado
Mar 10
LIS5:00 amLisbon Humberto Delgado
48h 16m
2 stops
SEA10:16 pmSeattle/Tacoma Intl
$490
Find similar
Air Canada
Mar 5
SEA5:50 amSeattle/Tacoma Intl
43h 30m
2 stops
LIS9:20 amLisbon Humberto Delgado
Mar 10
LIS5:00 amLisbon Humberto Delgado
48h 16m
2 stops
SEA10:16 pmSeattle/Tacoma Intl
$493
Find similar
Air Canada
Jan 10
SEA3:40 pmSeattle/Tacoma Intl
33h 40m
2 stops
LIS9:20 amLisbon Humberto Delgado
Jan 22
LIS5:00 amLisbon Humberto Delgado
36h 15m
2 stops
SEA9:15 amSeattle/Tacoma Intl
$495
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 December 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

Wed 2/25

3:10 pm-1:15 pm

1 stop14h 05m

Porto

Fri 3/6

6:30 am-1:20 pm

1 stop14h 50m

$462

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Tue 2/24

1:40 pm-10:30 am

1 stop12h 50m

Porto

Sat 3/7

4:10 pm-11:35 am

1 stop27h 25m

$479

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Wed 2/25

2:15 pm-10:25 am

1 stop36h 10m

Porto

Thu 3/5

4:10 pm-11:35 am

1 stop27h 25m

$480

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Wed 2/25

3:10 pm-1:15 pm

1 stop14h 05m

Porto

Fri 3/6

6:30 am-7:16 pm

2 stops20h 46m

$481

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Tue 2/24

8:17 am-10:15 am

1 stop17h 58m

Lisbon Humberto Delgado

Thu 3/5

5:00 am-12:10 pm

1 stop15h 10m

$484

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Sun 4/19

6:40 pm-5:50 pm

1 stop15h 10m

Lisbon Humberto Delgado

Wed 4/29

5:00 am-4:30 pm

1 stop19h 30m

$485

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Tue 2/24

9:00 am-9:30 am

2 stops16h 30m

Porto

Fri 3/6

6:00 am-10:45 pm

2 stops24h 45m

$486

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Sun 3/1

2:10 pm-5:30 pm

1 stop19h 20m

Lisbon Humberto Delgado

Tue 3/10

5:00 am-12:35 pm

1 stop14h 35m

$487

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Thu 4/9

8:00 am-11:05 am

1 stop19h 05m

Lisbon Humberto Delgado

Fri 4/17

6:15 am-9:33 am

2 stops35h 18m

$488

SeattleFunchal

SEA - FNC

SEAFNC

Seattle/Tacoma Intl

Wed 3/4

6:50 pm-11:20 am

1 stop32h 30m

Funchal Madeira

Wed 3/11

4:00 pm-5:55 pm

1 stop32h 55m

$535

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 $588, 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 $602.

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 $878 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 $729 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

14h 05m

Direct flights

None
The fastest flight from Seattle to Portugal takes 14h 05m
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 $354Free CancellationRating
7.0
592 reviews
Search Icelandair flights
KLMPriceFrom $481Free CancellationRating
7.7
1,434 reviews
Search KLM flights
British AirwaysPriceFrom $507Free CancellationRating
6.7
7,617 reviews
Search British Airways flights
United AirlinesPriceFrom $509Free CancellationRating
7.4
9,115 reviews
Search United Airlines flights
LufthansaPriceFrom $515Free CancellationRating
6.8
7,655 reviews
Search Lufthansa flights
Air CanadaPriceFrom $543Free CancellationRating
7.1
10,562 reviews
Search Air Canada flights
Air FrancePriceFrom $553Free CancellationRating
7.4
1,515 reviews
Search Air France flights
American AirlinesPriceFrom $558Free CancellationRating
7.2
11,064 reviews
Search American Airlines flights
SWISSPriceFrom $562Free CancellationRating
7.5
1,818 reviews
Search SWISS flights
Scandinavian AirlinesPriceFrom $576Free CancellationRating
7.4
1,625 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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