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Cheap flights from Seattle to Portugal from $246

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 4/15. 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 - 12:50 pm
SEA
-
OPO
13h 40m1 stop
Lufthansa Logo
2:05 pm - 1:20 pm
OPO
-
SEA
31h 15m1 stop
$448Lufthansa
Fri, Jan 30 - Thu, Feb 5
Multiple Airlines Logo
12:32 pm - 6:30 pm
SEA
-
OPO
21h 58m2 stops
Multiple Airlines Logo
2:05 pm - 1:20 pm
OPO
-
SEA
31h 15m1 stop
$454Multiple Airlines
Thu, Feb 19 - Thu, Feb 26
United Airlines Logo
11:59 pm - 9:30 am
SEA
-
OPO
25h 31m2 stops
United Airlines Logo
6:00 am - 6:04 pm
OPO
-
SEA
20h 04m2 stops
$477United Airlines
Sat, Feb 21 - Fri, Mar 6
KLM Logo
1:40 pm - 10:30 am
SEA
-
OPO
12h 50m1 stop
KLM Logo
4:10 pm - 11:40 am
OPO
-
SEA
27h 30m1 stop
$479KLM
Tue, Jan 27 - Tue, Feb 3
KLM Logo
3:05 pm - 9:05 am
SEA
-
FAO
34h 00m1 stop
KLM Logo
7:15 pm - 11:35 am
FAO
-
SEA
24h 20m1 stop
$483KLM
Fri, Feb 20 - Mon, Mar 2
United Airlines Logo
9:00 am - 8:10 am
SEA
-
LIS
15h 10m2 stops
United Airlines Logo
5:00 am - 1:10 pm
LIS
-
SEA
15h 10m1 stop
$484United Airlines
Tue, Feb 24 - Thu, Mar 12
Delta Logo
7:10 am - 11:20 am
SEA
-
LIS
20h 10m2 stops
Delta Logo
5:00 am - 11:40 am
LIS
-
SEA
14h 40m1 stop
$491Delta
Tue, Jan 27 - Tue, Feb 10
Delta Logo
1:40 pm - 3:10 pm
SEA
-
LIS
17h 30m1 stop
Delta Logo
5:30 am - 2:05 pm
LIS
-
SEA
15h 35m1 stop
$492Delta
Thu, Feb 26 - Mon, Mar 9
British Airways Logo
8:04 am - 4:25 pm
SEA
-
FNC
24h 21m2 stops
British Airways Logo
5:15 pm - 11:30 am
FNC
-
SEA
26h 15m1 stop
$654British Airways
Thu, Jan 22 - Fri, Mar 6
British Airways Logo
6:50 pm - 4:05 pm
SEA
-
FNC
37h 15m1 stop
British Airways Logo
12:10 pm - 11:30 am
FNC
-
SEA
31h 20m1 stop
$664British Airways
Thu, Jan 22 - Fri, Mar 6

British Airways flights from Seattle to Portugal

Our best British Airways deals on Seattle to Portugal flight tickets
British Airways
Feb 9
SEA8:04 amSeattle/Tacoma Intl
22h 51m
2 stops
LIS2:55 pmLisbon Humberto Delgado
Feb 23
LIS6:35 pmLisbon Humberto Delgado
36h 29m
2 stops
SEA11:04 pmSeattle/Tacoma Intl
$508
Find similar
British Airways
Jan 13
SEA6:12 amSeattle/Tacoma Intl
18h 53m
1 stop
LIS9:05 amLisbon Humberto Delgado
Jan 30
LIS7:05 amLisbon Humberto Delgado
17h 50m
1 stop
SEA4:55 pmSeattle/Tacoma Intl
$515
Find similar
British Airways
Jan 10
SEA6:12 amSeattle/Tacoma Intl
18h 53m
1 stop
LIS9:05 amLisbon Humberto Delgado
Jan 22
LIS10:55 amLisbon Humberto Delgado
19h 12m
1 stop
SEA10:07 pmSeattle/Tacoma Intl
$554
Find similar

Air Canada flights from Seattle to Portugal

Our best Air Canada deals on Seattle to Portugal flight tickets
Air Canada
Jan 10
SEA8:00 pmSeattle/Tacoma Intl
29h 20m
2 stops
LIS9:20 amLisbon Humberto Delgado
Jan 22
LIS5:00 amLisbon Humberto Delgado
22h 16m
2 stops
SEA7:16 pmSeattle/Tacoma Intl
$495
Find similar
Air Canada
Feb 23
SEA8:00 pmSeattle/Tacoma Intl
29h 20m
2 stops
LIS9:20 amLisbon Humberto Delgado
Mar 8
LIS10:50 amLisbon Humberto Delgado
42h 16m
2 stops
SEA10:06 pmSeattle/Tacoma Intl
$502
Find similar
Air Canada
Jan 24
SEA10:05 amSeattle/Tacoma Intl
39h 15m
2 stops
LIS9:20 amLisbon Humberto Delgado
Feb 8
LIS10:50 amLisbon Humberto Delgado
19h 26m
1 stop
SEA10:16 pmSeattle/Tacoma Intl
$504
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 January 1, 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

Fri 1/30

3:10 pm-12:50 pm

1 stop13h 40m

Porto

Thu 2/5

2:05 pm-1:20 pm

1 stop31h 15m

$448

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Thu 2/19

12:32 pm-6:30 pm

2 stops21h 58m

Porto

Thu 2/26

2:05 pm-1:20 pm

1 stop31h 15m

$454

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Sat 2/21

11:59 pm-9:30 am

2 stops25h 31m

Porto

Fri 3/6

6:00 am-6:04 pm

2 stops20h 04m

$477

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Tue 1/27

1:40 pm-10:30 am

1 stop12h 50m

Porto

Tue 2/3

4:10 pm-11:40 am

1 stop27h 30m

$479

SeattleFaro

SEA - FAO

SEAFAO

Seattle/Tacoma Intl

Fri 2/20

3:05 pm-9:05 am

1 stop34h 00m

Faro

Mon 3/2

7:15 pm-11:35 am

1 stop24h 20m

$483

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Tue 2/24

9:00 am-8:10 am

2 stops15h 10m

Lisbon Humberto Delgado

Thu 3/12

5:00 am-1:10 pm

1 stop15h 10m

$484

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Tue 1/27

7:10 am-11:20 am

2 stops20h 10m

Lisbon Humberto Delgado

Tue 2/10

5:00 am-11:40 am

1 stop14h 40m

$491

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Thu 2/26

1:40 pm-3:10 pm

1 stop17h 30m

Lisbon Humberto Delgado

Mon 3/9

5:30 am-2:05 pm

1 stop15h 35m

$492

SeattleFunchal

SEA - FNC

SEAFNC

Seattle/Tacoma Intl

Thu 1/22

8:04 am-4:25 pm

2 stops24h 21m

Funchal Madeira

Fri 3/6

5:15 pm-11:30 am

1 stop26h 15m

$654

SeattleFunchal

SEA - FNC

SEAFNC

Seattle/Tacoma Intl

Thu 1/22

6:50 pm-4:05 pm

1 stop37h 15m

Funchal Madeira

Fri 3/6

12:10 pm-11:30 am

1 stop31h 20m

$664

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.

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 $879 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

13h 55m

Direct flights

None
The fastest flight from Seattle to Portugal takes 13h 55m
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 $353Free CancellationRating
7.1
593 reviews
Search Icelandair flights
KLMPriceFrom $481Free CancellationRating
7.7
1,435 reviews
Search KLM flights
LufthansaPriceFrom $495Free CancellationRating
6.8
7,675 reviews
Search Lufthansa flights
British AirwaysPriceFrom $507Free CancellationRating
6.7
7,631 reviews
Search British Airways flights
United AirlinesPriceFrom $509Free CancellationRating
7.4
9,127 reviews
Search United Airlines flights
Air CanadaPriceFrom $543Free CancellationRating
7.1
10,571 reviews
Search Air Canada flights
Air FrancePriceFrom $553Free CancellationRating
7.4
1,514 reviews
Search Air France flights
American AirlinesPriceFrom $558Free CancellationRating
7.2
11,069 reviews
Search American Airlines flights
SWISSPriceFrom $562Free CancellationRating
7.5
1,830 reviews
Search SWISS flights
Scandinavian AirlinesPriceFrom $576Free CancellationRating
7.4
1,629 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

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Popular flights according to clicks in the last 7 days on momondo
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