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Cheap flights from Seattle to Portugal from $242

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 12/1. 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
1 adult, Economy, 0 bags

Discover deals from 900+ travel sites with momondo.

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 - 10:05 pm
SEA
-
LIS
22h 10m
1 stop
Scandinavian Airlines Logo
10:55 pm - 1:45 pm
LIS
-
SEA
22h 50m
1 stop
$611Scandinavian Airlines
Fri, Sep 4 - Sat, Sep 12
Air Canada Logo
5:40 am - 9:20 am
SEA
-
LIS
19h 40m
2 stops
Air Canada Logo
6:45 am - 6:32 pm
LIS
-
SEA
19h 47m
2 stops
$696Air Canada
Tue, Oct 13 - Wed, Oct 21
United Airlines Logo
7:00 am - 8:10 am
SEA
-
LIS
17h 10m
2 stops
United Airlines Logo
5:00 am - 12:00 pm
LIS
-
SEA
15h 00m
1 stop
$733United Airlines
Mon, Nov 9 - Wed, Nov 18
Lufthansa Logo
3:15 pm - 9:50 am
SEA
-
LIS
34h 35m
2 stops
Lufthansa Logo
5:00 am - 12:00 pm
LIS
-
SEA
15h 00m
1 stop
$736Lufthansa
Sun, Nov 8 - Wed, Nov 18
Lufthansa Logo
3:15 pm - 9:50 am
SEA
-
LIS
34h 35m
2 stops
Lufthansa Logo
5:00 am - 12:00 pm
LIS
-
SEA
15h 00m
1 stop
$737Lufthansa
Sun, Nov 8 - Wed, Nov 18
United Airlines Logo
7:00 am - 11:00 am
SEA
-
LIS
20h 00m
2 stops
United Airlines Logo
5:00 am - 12:00 pm
LIS
-
SEA
15h 00m
1 stop
$741United Airlines
Wed, Nov 11 - Thu, Nov 19
British Airways Logo
6:50 pm - 5:50 pm
SEA
-
OPO
15h 00m
1 stop
British Airways Logo
8:40 pm - 10:15 pm
OPO
-
SEA
33h 35m
2 stops
$759British Airways
Wed, Nov 11 - Tue, Nov 17
KLM Logo
9:40 am - 5:10 pm
SEA
-
FNC
23h 30m
2 stops
KLM Logo
6:00 pm - 11:47 am
FNC
-
SEA
25h 47m
1 stop
$855KLM
Thu, Nov 5 - Fri, Nov 13
KLM Logo
9:40 am - 5:10 pm
SEA
-
FNC
23h 30m
2 stops
KLM Logo
6:00 pm - 4:35 pm
FNC
-
SEA
30h 35m
2 stops
$865KLM
Thu, Nov 5 - Fri, Nov 13
British Airways Logo
11:42 am - 2:20 pm
SEA
-
FNC
42h 38m
2 stops
British Airways Logo
12:10 pm - 4:55 pm
FNC
-
SEA
36h 45m
1 stop
$964British Airways
Mon, Nov 16 - Fri, Nov 20

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Icelandair flights from Seattle to Portugal

Our best Icelandair deals on Seattle to Portugal flight tickets
Icelandair
Oct 24
SEA3:40 pmSeattle/Tacoma Intl
14h 10m
1 stop
LIS1:50 pmLisbon Humberto Delgado
Dec 6
LIS2:00 pmLisbon Humberto Delgado
35h 00m
1 stop
SEA5:00 pmSeattle/Tacoma Intl
$739
Icelandair
Oct 24
SEA3:40 pmSeattle/Tacoma Intl
14h 10m
1 stop
LIS1:50 pmLisbon Humberto Delgado
Dec 8
LIS2:00 pmLisbon Humberto Delgado
35h 00m
1 stop
SEA5:00 pmSeattle/Tacoma Intl
$762
Icelandair
Oct 23
SEA7:00 pmSeattle/Tacoma Intl
34h 50m
1 stop
LIS1:50 pmLisbon Humberto Delgado
Dec 6
LIS2:00 pmLisbon Humberto Delgado
35h 00m
1 stop
SEA5:00 pmSeattle/Tacoma Intl
$763

Delta flights from Seattle to Portugal

Our best Delta deals on Seattle to Portugal flight tickets
Delta
Oct 21
SEA7:20 amSeattle/Tacoma Intl
16h 40m
1 stop
LIS8:00 amLisbon Humberto Delgado
Dec 8
LIS5:00 amLisbon Humberto Delgado
14h 50m
1 stop
SEA11:50 amSeattle/Tacoma Intl
$745
Delta
Oct 13
SEA1:30 pmSeattle/Tacoma Intl
13h 45m
1 stop
LIS11:15 amLisbon Humberto Delgado
Oct 21
LIS11:55 amLisbon Humberto Delgado
31h 57m
1 stop
SEA11:52 amSeattle/Tacoma Intl
$775
Delta
Oct 13
SEA2:30 pmSeattle/Tacoma Intl
19h 20m
2 stops
LIS5:50 pmLisbon Humberto Delgado
Oct 19
LIS11:55 amLisbon Humberto Delgado
31h 57m
1 stop
SEA11:52 amSeattle/Tacoma Intl
$779

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 June 23, 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

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Fri 9/4

3:55 pm-10:05 pm

1 stop22h 10m

Lisbon Humberto Delgado

Sat 9/12

10:55 pm-1:45 pm

1 stop22h 50m

$611

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Tue 10/13

5:40 am-9:20 am

2 stops19h 40m

Lisbon Humberto Delgado

Wed 10/21

6:45 am-6:32 pm

2 stops19h 47m

$696
Quickest round-trip

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Mon 11/9

7:00 am-8:10 am

2 stops17h 10m

Lisbon Humberto Delgado

Wed 11/18

5:00 am-12:00 pm

1 stop15h 00m

$733

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Sun 11/8

3:15 pm-9:50 am

2 stops34h 35m

Lisbon Humberto Delgado

Wed 11/18

5:00 am-12:00 pm

1 stop15h 00m

$736

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Sun 11/8

3:15 pm-9:50 am

2 stops34h 35m

Lisbon Humberto Delgado

Wed 11/18

5:00 am-12:00 pm

1 stop15h 00m

$737

SeattleLisbon

SEA - LIS

SEALIS

Seattle/Tacoma Intl

Wed 11/11

7:00 am-11:00 am

2 stops20h 00m

Lisbon Humberto Delgado

Thu 11/19

5:00 am-12:00 pm

1 stop15h 00m

$741

SeattlePorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Wed 11/11

6:50 pm-5:50 pm

1 stop15h 00m

Porto

Tue 11/17

8:40 pm-10:15 pm

2 stops33h 35m

$759

SeattleFunchal

SEA - FNC

SEAFNC

Seattle/Tacoma Intl

Thu 11/5

9:40 am-5:10 pm

2 stops23h 30m

Funchal Madeira

Fri 11/13

6:00 pm-11:47 am

1 stop25h 47m

$855

SeattleFunchal

SEA - FNC

SEAFNC

Seattle/Tacoma Intl

Thu 11/5

9:40 am-5:10 pm

2 stops23h 30m

Funchal Madeira

Fri 11/13

6:00 pm-4:35 pm

2 stops30h 35m

$865

SeattleFunchal

SEA - FNC

SEAFNC

Seattle/Tacoma Intl

Mon 11/16

11:42 am-2:20 pm

2 stops42h 38m

Funchal Madeira

Fri 11/20

12:10 pm-4:55 pm

1 stop36h 45m

$964

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 $831 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 $726 on momondo.

Can stopping save me money on Seattle to Portugal flights?

You could potentially save up to 36% 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

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
684 reviews
Search Icelandair flights
LufthansaPriceFrom $482Free CancellationRating
6.8
8,090 reviews
Search Lufthansa flights
British AirwaysPriceFrom $482Free CancellationRating
6.7
8,067 reviews
Search British Airways flights
KLMPriceFrom $482Free CancellationRating
7.8
1,530 reviews
Search KLM flights
United AirlinesPriceFrom $488Free CancellationRating
7.4
9,878 reviews
Search United Airlines flights
American AirlinesPriceFrom $497Free CancellationRating
7.1
11,747 reviews
Search American Airlines flights
Air FrancePriceFrom $504Free CancellationRating
7.5
1,613 reviews
Search Air France flights
Aer LingusPriceFrom $535Free CancellationRating
7.3
1,622 reviews
Search Aer Lingus flights
Air CanadaPriceFrom $543Free CancellationRating
7.1
11,244 reviews
Search Air Canada flights
DeltaPriceFrom $550Free CancellationRating
7.8
8,427 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

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Find better results for your trip to Portugal

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