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Cheap flights from Seattle to Portugal from $257

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 10/18. 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.
Icelandair Logo
2:35 pm - 12:50 pmSEA  Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado
14h 15m1 stop Reykjavik Keflavik Intl
Icelandair Logo
11:35 am - 5:00 pmLIS  Lisbon Humberto Delgado-SEA Seattle/Tacoma Intl
13h 25m1 stop Reykjavik Keflavik Intl
$694Icelandair
Sat, Jan 30 - Tue, Feb 9
Multiple Airlines Logo
10:10 am - 9:20 amSEA  Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado
15h 10m2 stops Vancouver Intl Montreal Pierre Elliott Trudeau Intl
Multiple Airlines Logo
5:00 am - 6:22 pmLIS  Lisbon Humberto Delgado-SEA Seattle/Tacoma Intl
21h 22m2 stops Frankfurt am Main Vancouver Intl
$717Multiple Airlines
Mon, Feb 1 - Tue, Feb 23
Lufthansa Logo
3:50 pm - 1:30 pmSEA  Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado
14h 40m1 stop Munich Franz Josef Strauss
Lufthansa Logo
5:00 am - 12:00 pmLIS  Lisbon Humberto Delgado-SEA Seattle/Tacoma Intl
15h 00m1 stop Frankfurt am Main
$724Lufthansa
Wed, Oct 28 - Wed, Nov 25
Lufthansa Logo
2:50 pm - 11:30 pmSEA  Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado
24h 40m1 stop Munich Franz Josef Strauss
Lufthansa Logo
5:00 am - 12:00 pmLIS  Lisbon Humberto Delgado-SEA Seattle/Tacoma Intl
15h 00m1 stop Frankfurt am Main
$724Lufthansa
Wed, Nov 4 - Wed, Nov 18
Multiple Airlines Logo
2:50 pm - 1:30 pmSEA  Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado
14h 40m1 stop Munich Franz Josef Strauss
Multiple Airlines Logo
5:00 am - 2:37 pmLIS  Lisbon Humberto Delgado-SEA Seattle/Tacoma Intl
17h 37m2 stops Frankfurt am Main Vancouver Intl
$724Multiple Airlines
Wed, Nov 4 - Wed, Nov 18
British Airways Logo
6:45 pm - 6:55 pmSEA  Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado
16h 10m1 stop London Heathrow
British Airways Logo
11:05 am - 10:01 pmLIS  Lisbon Humberto Delgado-SEA Seattle/Tacoma Intl
18h 56m1 stop Philadelphia
$737British Airways
Mon, Feb 1 - Tue, Feb 23
Air Canada Logo
10:10 am - 6:55 amSEA  Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado
36h 45m2 stops Vancouver Intl Montreal Pierre Elliott Trudeau Intl
Air Canada Logo
5:00 am - 2:37 pmLIS  Lisbon Humberto Delgado-SEA Seattle/Tacoma Intl
17h 37m2 stops Frankfurt am Main Vancouver Intl
$743Air Canada
Tue, Nov 17 - Fri, Nov 27
Air Canada Logo
3:15 pm - 10:40 amSEA  Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado
35h 25m2 stops Vancouver Intl Montreal Pierre Elliott Trudeau Intl
Air Canada Logo
5:00 am - 6:22 pmLIS  Lisbon Humberto Delgado-SEA Seattle/Tacoma Intl
21h 22m2 stops Frankfurt am Main Vancouver Intl
$743Air Canada
Sun, Nov 8 - Tue, Nov 24
Icelandair Logo
3:40 pm - 1:50 pmSEA  Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado
14h 10m1 stop Reykjavik Keflavik Intl
Icelandair Logo
3:00 pm - 8:40 pmLIS  Lisbon Humberto Delgado-SEA Seattle/Tacoma Intl
13h 40m1 stop Reykjavik Keflavik Intl
$751Icelandair
Sat, Oct 3 - Sun, Oct 18
British Airways Logo
6:45 pm - 6:55 pmSEA  Seattle/Tacoma Intl-LIS Lisbon Humberto Delgado
16h 10m1 stop London Heathrow
British Airways Logo
6:35 pm - 11:25 amLIS  Lisbon Humberto Delgado-SEA Seattle/Tacoma Intl
24h 50m1 stop London Heathrow
$757British Airways
Mon, Nov 9 - Mon, Nov 23

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United Airlines flights from Seattle to Portugal

Our best United Airlines deals on Seattle to Portugal flight tickets
United Airlines
Nov 4
SEA6:45 amSeattle/Tacoma Intl
17h 25m
1 stop
LIS8:10 amLisbon Humberto Delgado
Nov 18
LIS5:00 amLisbon Humberto Delgado
15h 00m
1 stop
SEA12:00 pmSeattle/Tacoma Intl
$744
United Airlines
Oct 27
SEA8:09 amSeattle/Tacoma Intl
18h 56m
1 stop
LIS10:05 amLisbon Humberto Delgado
Nov 24
LIS12:50 pmLisbon Humberto Delgado
31h 29m
2 stops
SEA12:19 pmSeattle/Tacoma Intl
$746
United Airlines
Nov 4
SEA7:00 amSeattle/Tacoma Intl
19h 20m
2 stops
LIS10:20 amLisbon Humberto Delgado
Nov 18
LIS5:00 amLisbon Humberto Delgado
15h 00m
1 stop
SEA12:00 pmSeattle/Tacoma Intl
$748

Icelandair flights from Seattle to Portugal

Our best Icelandair deals on Seattle to Portugal flight tickets
Icelandair
Jan 30
SEA2:35 pmSeattle/Tacoma Intl
14h 15m
1 stop
LIS12:50 pmLisbon Humberto Delgado
Feb 9
LIS11:35 amLisbon Humberto Delgado
13h 25m
1 stop
SEA5:00 pmSeattle/Tacoma Intl
$694
Icelandair
Oct 4
SEA7:00 pmSeattle/Tacoma Intl
34h 50m
1 stop
LIS1:50 pmLisbon Humberto Delgado
Oct 18
LIS3:00 pmLisbon Humberto Delgado
13h 40m
1 stop
SEA8:40 pmSeattle/Tacoma Intl
$753
Icelandair
Oct 11
SEA7:00 pmSeattle/Tacoma Intl
34h 50m
1 stop
LIS1:50 pmLisbon Humberto Delgado
Oct 20
LIS3:00 pmLisbon Humberto Delgado
13h 40m
1 stop
SEA8:40 pmSeattle/Tacoma Intl
$760

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 August 10, 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
Quickest round-trip

SeattleLisbon

SEA Seattle/Tacoma Intl - LIS Lisbon Humberto Delgado

SEALIS

Seattle/Tacoma Intl

Sat 1/30

2:35 pm-12:50 pm

1 stop14h 15m

Lisbon Humberto Delgado

Tue 2/9

11:35 am-5:00 pm

1 stop13h 25m

$694

SeattleLisbon

SEA Seattle/Tacoma Intl - LIS Lisbon Humberto Delgado

SEALIS

Seattle/Tacoma Intl

Mon 2/1

10:10 am-9:20 am

2 stops15h 10m

Lisbon Humberto Delgado

Tue 2/23

5:00 am-6:22 pm

2 stops21h 22m

$717

SeattleLisbon

SEA Seattle/Tacoma Intl - LIS Lisbon Humberto Delgado

SEALIS

Seattle/Tacoma Intl

Wed 10/28

3:50 pm-1:30 pm

1 stop14h 40m

Lisbon Humberto Delgado

Wed 11/25

5:00 am-12:00 pm

1 stop15h 00m

$724

SeattleLisbon

SEA Seattle/Tacoma Intl - LIS Lisbon Humberto Delgado

SEALIS

Seattle/Tacoma Intl

Wed 11/4

2:50 pm-11:30 pm

1 stop24h 40m

Lisbon Humberto Delgado

Wed 11/18

5:00 am-12:00 pm

1 stop15h 00m

$724

SeattleLisbon

SEA Seattle/Tacoma Intl - LIS Lisbon Humberto Delgado

SEALIS

Seattle/Tacoma Intl

Wed 11/4

2:50 pm-1:30 pm

1 stop14h 40m

Lisbon Humberto Delgado

Wed 11/18

5:00 am-2:37 pm

2 stops17h 37m

$724

SeattleLisbon

SEA Seattle/Tacoma Intl - LIS Lisbon Humberto Delgado

SEALIS

Seattle/Tacoma Intl

Mon 2/1

6:45 pm-6:55 pm

1 stop16h 10m

Lisbon Humberto Delgado

Tue 2/23

11:05 am-10:01 pm

1 stop18h 56m

$737

SeattleLisbon

SEA Seattle/Tacoma Intl - LIS Lisbon Humberto Delgado

SEALIS

Seattle/Tacoma Intl

Tue 11/17

10:10 am-6:55 am

2 stops36h 45m

Lisbon Humberto Delgado

Fri 11/27

5:00 am-2:37 pm

2 stops17h 37m

$743

SeattleLisbon

SEA Seattle/Tacoma Intl - LIS Lisbon Humberto Delgado

SEALIS

Seattle/Tacoma Intl

Sun 11/8

3:15 pm-10:40 am

2 stops35h 25m

Lisbon Humberto Delgado

Tue 11/24

5:00 am-6:22 pm

2 stops21h 22m

$743

SeattleLisbon

SEA Seattle/Tacoma Intl - LIS Lisbon Humberto Delgado

SEALIS

Seattle/Tacoma Intl

Sat 10/3

3:40 pm-1:50 pm

1 stop14h 10m

Lisbon Humberto Delgado

Sun 10/18

3:00 pm-8:40 pm

1 stop13h 40m

$751

SeattleLisbon

SEA Seattle/Tacoma Intl - LIS Lisbon Humberto Delgado

SEALIS

Seattle/Tacoma Intl

Mon 11/9

6:45 pm-6:55 pm

1 stop16h 10m

Lisbon Humberto Delgado

Mon 11/23

6:35 pm-11:25 am

1 stop24h 50m

$757

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 $489, 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 February instead. Flights to Portugal in February, while not as cheap as those in January, still average around $579.

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 $848 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 $713 on momondo.

Can stopping save me money on Seattle to Portugal flights?

You could potentially save up to 26% 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 00m

Direct flights

None
The fastest flight from Seattle to Portugal takes 14h 00m
There are no direct flights from Seattle to Portugal. There are no popular flight routes from Seattle to Portugal.
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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
6.9
728 reviews
Search Icelandair flights
LufthansaPriceFrom $475Free CancellationRating
6.8
8,177 reviews
Search Lufthansa flights
KLMPriceFrom $481Free CancellationRating
7.8
1,556 reviews
Search KLM flights
British AirwaysPriceFrom $482Free CancellationRating
6.7
8,154 reviews
Search British Airways flights
United AirlinesPriceFrom $486Free CancellationRating
7.4
10,102 reviews
Search United Airlines flights
American AirlinesPriceFrom $497Free CancellationRating
7.1
11,902 reviews
Search American Airlines flights
Air FrancePriceFrom $504Free CancellationRating
7.5
1,640 reviews
Search Air France flights
Aer LingusPriceFrom $523Free CancellationRating
7.3
1,693 reviews
Search Aer Lingus flights
Air CanadaPriceFrom $543Free CancellationRating
7.1
11,461 reviews
Search Air Canada flights
DeltaPriceFrom $550Free CancellationRating
7.8
8,506 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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