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Cheap flights from Seattle to Portugal from $326

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 8/11. 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.
Scandinavian Airlines Logo
3:55 pm - 9:40 am
SEA
-
FAO
33h 45m
1 stop
Scandinavian Airlines Logo
12:00 pm - 10:12 pm
FAO
-
SEA
41h 12m
2 stops
$757Scandinavian Airlines
Sun, Oct 4 - Tue, Oct 27
Multiple Airlines Logo
3:55 pm - 8:20 pm
SEA
-
LIS
20h 25m
2 stops
Multiple Airlines Logo
10:55 pm - 1:45 pm
LIS
-
SEA
22h 50m
1 stop
$814Multiple Airlines
Fri, Sep 4 - Sat, Sep 12
Air Canada Logo
7:05 pm - 9:50 am
SEA
-
LIS
31h 45m
2 stops
Air Canada Logo
5:00 am - 6:26 pm
LIS
-
SEA
21h 26m
2 stops
$823Air Canada
Sun, Oct 25 - Thu, Nov 12
United Airlines Logo
8:00 am - 10:15 am
SEA
-
LIS
19h 15m
1 stop
United Airlines Logo
5:00 am - 12:10 pm
LIS
-
SEA
15h 10m
1 stop
$825United Airlines
Tue, Oct 27 - Fri, Nov 6
Air Canada Logo
8:10 am - 11:00 am
SEA
-
LIS
19h 50m
1 stop
Air Canada Logo
5:00 am - 9:56 pm
LIS
-
SEA
24h 56m
2 stops
$828Air Canada
Wed, Oct 28 - Fri, Nov 6
United Airlines Logo
11:49 pm - 9:45 am
SEA
-
OPO
25h 56m
2 stops
United Airlines Logo
12:15 pm - 7:07 pm
OPO
-
SEA
38h 52m
2 stops
$839United Airlines
Sat, Aug 8 - Tue, Aug 25
Lufthansa Logo
7:20 pm - 7:00 am
SEA
-
OPO
27h 40m
2 stops
Lufthansa Logo
6:20 am - 4:59 pm
OPO
-
SEA
18h 39m
1 stop
$895Lufthansa
Sun, Jul 5 - Tue, Jul 21
KLM Logo
1:50 pm - 7:30 pm
SEA
-
FAO
21h 40m
1 stop
KLM Logo
10:00 am - 11:47 am
FAO
-
SEA
33h 47m
1 stop
$972KLM
Tue, Sep 8 - Tue, Sep 15
KLM Logo
1:50 pm - 7:40 am
SEA
-
FAO
33h 50m
1 stop
KLM Logo
8:35 pm - 4:13 pm
FAO
-
SEA
27h 38m
2 stops
$982KLM
Tue, Sep 8 - Tue, Sep 15
Lufthansa Logo
2:10 pm - 2:45 pm
SEA
-
FNC
16h 35m
1 stop
Lufthansa Logo
11:25 am - 4:59 pm
FNC
-
SEA
37h 34m
1 stop
$1,183Lufthansa
Thu, May 28 - Wed, Jun 10

Air Canada flights from Seattle to Portugal

Our best Air Canada deals on Seattle to Portugal flight tickets
Air Canada
Oct 25
SEA3:05 pmSeattle/Tacoma Intl
35h 45m
2 stops
LIS9:50 amLisbon Humberto Delgado
Nov 11
LIS5:00 amLisbon Humberto Delgado
21h 26m
2 stops
SEA6:26 pmSeattle/Tacoma Intl
$823
Air Canada
Oct 28
SEA8:10 amSeattle/Tacoma Intl
19h 50m
1 stop
LIS11:00 amLisbon Humberto Delgado
Nov 6
LIS5:00 amLisbon Humberto Delgado
24h 56m
2 stops
SEA9:56 pmSeattle/Tacoma Intl
$828
Air Canada
Aug 8
SEA7:20 pmSeattle/Tacoma Intl
51h 40m
2 stops
OPO7:00 amPorto
Aug 25
OPO12:15 pmPorto
18h 33m
2 stops
SEA10:48 pmSeattle/Tacoma Intl
$847

United Airlines flights from Seattle to Portugal

Our best United Airlines deals on Seattle to Portugal flight tickets
United Airlines
Oct 27
SEA8:00 amSeattle/Tacoma Intl
19h 15m
1 stop
LIS10:15 amLisbon Humberto Delgado
Nov 6
LIS5:00 amLisbon Humberto Delgado
15h 10m
1 stop
SEA12:10 pmSeattle/Tacoma Intl
$825
United Airlines
Oct 24
SEA11:50 pmSeattle/Tacoma Intl
25h 20m
2 stops
LIS8:10 amLisbon Humberto Delgado
Nov 12
LIS5:00 amLisbon Humberto Delgado
15h 10m
1 stop
SEA12:10 pmSeattle/Tacoma Intl
$829
United Airlines
Oct 24
SEA1:00 pmSeattle/Tacoma Intl
36h 10m
1 stop
LIS9:10 amLisbon Humberto Delgado
Nov 10
LIS5:00 amLisbon Humberto Delgado
15h 10m
1 stop
SEA12:10 pmSeattle/Tacoma Intl
$837

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 May 14, 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

Cheapest round-trip

SeattleFaro

SEA - FAO

SEAFAO

Seattle/Tacoma Intl

Sun 10/4

3:55 pm-9:40 am

1 stop33h 45m

Faro

Tue 10/27

12:00 pm-10:12 pm

2 stops41h 12m

$757

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Fri 9/4

3:55 pm-8:20 pm

2 stops20h 25m

Lisbon Humberto Delgado

Sat 9/12

10:55 pm-1:45 pm

1 stop22h 50m

$814

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Sun 10/25

7:05 pm-9:50 am

2 stops31h 45m

Lisbon Humberto Delgado

Thu 11/12

5:00 am-6:26 pm

2 stops21h 26m

$823
Quickest round-trip

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Tue 10/27

8:00 am-10:15 am

1 stop19h 15m

Lisbon Humberto Delgado

Fri 11/6

5:00 am-12:10 pm

1 stop15h 10m

$825

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Wed 10/28

8:10 am-11:00 am

1 stop19h 50m

Lisbon Humberto Delgado

Fri 11/6

5:00 am-9:56 pm

2 stops24h 56m

$828

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Sat 8/8

11:49 pm-9:45 am

2 stops25h 56m

Porto

Tue 8/25

12:15 pm-7:07 pm

2 stops38h 52m

$839

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Sun 7/5

7:20 pm-7:00 am

2 stops27h 40m

Porto

Tue 7/21

6:20 am-4:59 pm

1 stop18h 39m

$895

SeattleFaro

SEA - FAO

SEAFAO

Seattle/Tacoma Intl

Tue 9/8

1:50 pm-7:30 pm

1 stop21h 40m

Faro

Tue 9/15

10:00 am-11:47 am

1 stop33h 47m

$972

SeattleFaro

SEA - FAO

SEAFAO

Seattle/Tacoma Intl

Tue 9/8

1:50 pm-7:40 am

1 stop33h 50m

Faro

Tue 9/15

8:35 pm-4:13 pm

2 stops27h 38m

$982

SeattleFunchal

SEA - FNC

SEAFNC

Seattle/Tacoma Intl

Thu 5/28

2:10 pm-2:45 pm

1 stop16h 35m

Funchal Madeira

Wed 6/10

11:25 am-4:59 pm

1 stop37h 34m

$1,183

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 $339, 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 April instead. Flights to Portugal in April, while not as cheap as those in January, still average around $390.

How far in advance should I book a flight from Seattle 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 $816 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 $702 on momondo.

Can stopping save me money on Seattle to Portugal flights?

You could potentially save up to 37% 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 50m

Direct flights

None
The fastest flight from Seattle to Portugal takes 13h 50m
There are no direct flights from Seattle to Portugal. There are no popular flight routes from Seattle to Portugal.
Search flight deals

Frequently asked questions about flying from Seattle to Portugal

  • 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
7.0
654 reviews
Search Icelandair flights
KLMPriceFrom $481Free CancellationRating
7.8
1,517 reviews
Search KLM flights
LufthansaPriceFrom $482Free CancellationRating
6.8
8,002 reviews
Search Lufthansa flights
British AirwaysPriceFrom $482Free CancellationRating
6.7
7,980 reviews
Search British Airways flights
United AirlinesPriceFrom $494Free CancellationRating
7.4
9,717 reviews
Search United Airlines flights
Air FrancePriceFrom $505Free CancellationRating
7.4
1,589 reviews
Search Air France flights
Air CanadaPriceFrom $543Free CancellationRating
7.1
11,042 reviews
Search Air Canada flights
DeltaPriceFrom $545Free CancellationRating
7.9
8,452 reviews
Search Delta flights
Aer LingusPriceFrom $553Free CancellationRating
7.3
1,561 reviews
Search Aer Lingus flights
American AirlinesPriceFrom $558Free CancellationRating
7.1
11,662 reviews
Search American 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

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Find better results for your trip to Portugal

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